TY - RPRT A1 - Launert, Benjamin A1 - Pasternak, Hartmut A1 - Rhode, Michael A1 - Kromm, Arne A1 - Kannengießer, Thomas T1 - Erhöhung der Tragfähigkeit geschweißter I-Träger aus hochfestem Baustahl durch verbesserte Ansätze zur Berücksichtigung von Eigenspannungen Y1 - 2017 UR - https://www-docs.b-tu.de/fg-stahlbau/public/Fachgebiet_Stahlbau/AiF_TragEig/Kurvorstellung_P1035.pdf ER - TY - GEN A1 - Launert, Benjamin A1 - Pasternak, Hartmut T1 - Weld residual stresses effects in the design of welded plate girders: Simulation and Implementation T2 - Ce/papers N2 - Eurocode 3 offers different possibilities on a numerically-aided design of welded plate girders. In this, a geometrically and materially nonlinear analysis of the imperfect structure (GMNIA) provides the theoretically highest possible degree of realism. A correct implementation of “imperfections” is of critical importance in the practical application of this method. The current design rules are based on long term experience in terms of traditional (“old”) welding procedures and regular (“low strength”) steel grades. Thus, they provide very approximate (but safe) rules for these structures. With the introduction of modern shop welding operations and materials, many of these assumptions seem to be over-conservative. A revision of these rules is being processed in different national and international research projects. This particular study focusses on the weld residual stresses and their effects in conventional steel S355 and high strength steel S690. Metal active gas (MAG) welding under shop welding conditions was used. The measurement of weld residual stresses on component-like samples (carried out by the BAM Bundesanstalt für Materialforschung und -prüfung in Berlin) has been widely published. The hereupon based (simplified) welding simulation as part of a subsequent structural analysis is shown here. A novel numerical approach how to directly incorporate the results into large structural components models is presented. The capacity analysis is performed on a simple example for weak-axis buckling. The results indicate significant improvements in the utilization of load-bearing capacity and underline the superior buckling assignment for the S690 compared to conventional S355. The experimental validation of the findings is currently being prepared. KW - Stability KW - Welding imperfections KW - Residual stresses KW - Welding simulation KW - Nonlinear analysis Y1 - 2017 UR - http://onlinelibrary.wiley.com/doi/10.1002/cepa.144/abstract U6 - https://doi.org/10.1002/cepa.144 SN - 2509-7075 VL - 1 IS - 2-3 SP - 1039 EP - 1047 ER - TY - GEN A1 - Krausche, Thomas A1 - Launert, Benjamin A1 - Pasternak, Hartmut T1 - A study on the prediction of welding effects in steel box girders T2 - Ce/papers N2 - For standard sections including I-girders and rectangular box girders, several approaches on geometrical and structural imperfections are given in the literature, which can be implemented in a numerical analysis. For complex sections, as found in many of today's lightweight roof structures, these assumptions are conservative due to the sections typically unique shape, which leads to increased thicknesses or additional stiffening of the plates. This, on the other hand, can significantly affect fabrication costs. This paper aims to provide an overview on the possibilities in the numerical prediction of weld residual stresses and weld-induced deformations for these sections. The obtained values can be used in a subsequent numerical analysis to understand the structural behavior and optimize the design. A representative example on a section used in a steel compression ring is described and analyzed using the numerical welding simulation. A simplification of the originally transient weld procedure is used in order to reduce computation times to a practically reasonable level. In this context, the Abaqus Welding Interface (AWI) helps to automate working steps in conjunction with the definition of weld passes and their sequencing, which shall be shown in here. The applicability of this method is discussed showing also a need of further investigations in this field. This is especially with regard to result quality, which requires some experimental back-up. Nonetheless, this method could already help to show up tendencies or to identify potential critical spots in the design. KW - Innovative structures KW - Welding simulation KW - Abaqus Welding Interface Y1 - 2017 UR - http://onlinelibrary.wiley.com/doi/10.1002/cepa.500/abstract U6 - https://doi.org/10.1002/cepa.500 SN - 2509-7075 VL - 1 IS - 2-3 SP - 4410 EP - 4416 ER - TY - GEN A1 - Ciupack, Yvonne A1 - Ledecký, Lukáš A1 - Pasternak, Hartmut A1 - Fischer, Vitali A1 - Stammen, Elisabeth A1 - Dilger, Klaus T1 - Bonded steel joints under cyclic loading: Study on structural behaviour and fatigue T2 - ce/papers Y1 - 2017 U6 - https://doi.org/10.1002/cepa.87 SN - 2509-7075 VL - 1 IS - 2/3 SP - 505 EP - 513 ER - TY - CHAP A1 - Li, Zheng A1 - Pasternak, Hartmut ED - Bucher, Christian ED - Ellingwood, Bruce R. ED - Frangopol, Dan M. T1 - Reliability analysis of size effect on flexural members with stochastic finite element method T2 - 12th International Conference on Structural Safety & Reliability, Vienna, Austria, 6–10 August 2017 Y1 - 2017 SN - 978-3-903024-28-1 PB - TU-MV Media Verlag CY - Vienna ER - TY - CHAP A1 - Loebjinski, Maria A1 - Rug, Wolfgang A1 - Pasternak, Hartmut ED - Bucher, Christian ED - Ellingwood, Bruce R. ED - Frangopol, Dan M. T1 - Approaches for an optimisation of partial safety factors for historic timber structures T2 - Safety, Reliability, Risk, Resilience and Sustainability of Structures and Infrastructure, 12th International Conference on Structural Safety & Reliability, Vienna, Austria, 6–10 August 2017 Y1 - 2017 SN - 978-3-903024-28-1 PB - TU-MV Media Verlag CY - Vienna ER - TY - CHAP A1 - Pasternak, Hartmut A1 - Krausche, Thomas T1 - Design, constructions and assembly of two membrane-cladded double-curved cable net roofs T2 - 6th Structural Engineers World Congress (SEWC 2017), Cancun/Mexico N2 - For stadium roofs light weight constructions, that are tensioned between a cantilevering steel compression ring, are commonly build around the globe, mostly for social events like sport games and concerts. They allow having no columns in the viewing area and also spanning the whole arena. With the additional use of membranes as the roof shell, the inside of the building will get naturally lighted. With the knowledge of the occurring loads, an economic structure can be found to optimize the edge structure. Frequently the form finding process will use the death loads as decisive action because for only one load case a moment free form can be determined. Other load cases will cause bending in the girder. The process also allows having only supports at the low points and a cantilever arises. These types of roofs will be compared with two exemplary canopies in Germany. The main focus will be on the assembly of the edge girder, which will evoke challenges for planning as well as the actual manufacturing process. The steel edge girder is double curved and has a spatially shape. The welded box exists of 4 to 5 curving plates that have thicknesses from 15mm to 55mm and will vary in their height. Due to welding residual stresses occur during the assembly in the factory as well as on the construction side. For the design of the girders, the residual stresses need to be determined. The identified results of the residual stresses will vary through the plate thickness and will differ for residual longitudinal and residual transverse stresses. The longitudinal residual stresses, as the relevant residual stresses for axial forces, will be farther scrutinized. Due to its complex geometry the challenges of the simulation will be presented for the manufacturing process and the construction site assembly. For the farther investigation the calculated stresses will be taken for a load capacity calculation of a section of the edge girder. Due to the forming geometry and the welding process, both effects need to be considered. This calculation will also show that the edge girder needs to be stiffened in the inside with bulkhead plate’s und longitudinal stiffeners. Both authors are involved in the verification of the objects (Customer Centre in the Autostadt Wolfsburg-CC, Schierke-Arena ‐FA in the Harz Mountains) mentioned below. Y1 - 2017 UR - http://sewc2017.org/ PB - Universidad Nacional Autónoma de México - UNAM ER - TY - CHAP A1 - Krausche, Thomas A1 - Launert, Benjamin A1 - Pasternak, Hartmut T1 - Welding effects in unregularly steel box girders T2 - 6th Structural Engineers World Congress (SEWC 2017), Cancun/Mexico N2 - Several approaches on geometrical and structural imperfections are given in the literature for I sections and rectangular box girders. Those approximations of the residuals stress state can be implemented into the structural analysis using multi-purpose FEM program packages. The knowledge of the stress state of free forming cross sections has still to be determined. To fulfil a safe design, the assumptions mostly will be very conservative due to the lack of the assumed stress state. This will result directly to increased thicknesses or additional stiffening of the plates. Not only the material cost will rise, but also the fabrication costs like welding will be affected. This paper aims to provide an overview on the possibilities in the numerical prediction of weld residual stresses and weld induced deformations for cross sections with unique shapes. With the obtained values the tendencies of the residual stress state and deformations will be used to optimize the design. A representative example on a section used in a steel compression ring of a realized roof is described and analyzed using a simplification of a numerical welding simulation. The reduced simulation of the originally transient weld procedure was held to a practically reasonable level and can be reproduced for similar problems. The calculations used the Abaqus Welding Interface (AWI) to automate working steps in conjunction with the definition of weld passes and their sequencing. The field of the method that is discussed also a need of further investigations to prove its applicability. Some experimental back up is requires to verify the result quality. Nonetheless, this method could already help to show up tendencies or to identify potential critical spots in the design. Y1 - 2017 UR - http://sewc2017.org/ PB - Universidad Nacional Autónoma de México - UNAM ER - TY - CHAP A1 - Pasternak, Hartmut A1 - Jäger-Cañás, Andreas T1 - On the axial buckling of very thin-walled cylindrical shells T2 - Ce/papers : the online collection for conference papers in civil engineering N2 - Major advances in the buckling analysis of cylindrical shells have been achieved in the last two decades. Eurocode nowadays provides rules for tanks up to r/t = 5000. However, since only few literature has become available in the past, dealing specifically with very thin walled shells in the range between r/t = 1500 and r/t = 10000, code provisions either are quite conservative or, in case of r/t > 5000, do barely exist. Employing modern construction methods, close-to perfect, very thin-walled shells can be built that are out of the scope of the design codes. Therefore, to achieve more economical designs and a better sustainability, sophisticated design tools have to be used. In this paper, modifications and extensions of the current design procedure are proposed to overcome current limitations and drawbacks. A review of experiments with a special focus on cylinders with high r/t-ratios was conducted and modified lower bound approximation curves for the knock-down factor α deduced. They were checked against representative experiments from literature. Test results recalculated using an axisymmetric imperfection to explore their equivalent imperfection depth, proved that even small imperfections drastically reduce the buckling strength. Using a parametric study, the result range of α was extended up to r/t = 10000. The design proposal could be approved and an equation for the determination of an equivalent imperfection depth that relates the dependence of α to the imperfection depth and the r/t-ratio is proposed. Y1 - 2017 U6 - https://doi.org/10.1002/cepa.127 SN - 2509-7075 VL - 1 IS - 2-3 SP - 868 EP - 877 ER - TY - CHAP A1 - Jäger-Cañás, Andreas A1 - Pasternak, Hartmut T1 - Influence of closely spaced ring-stiffeners on the axial buckling behavior of cylindrical shells T2 - Ce/papers : the online collection for conference papers in civil engineering N2 - Material efficiency in modern tank constructions often is achieved by combining thin plates with light and heavy ring stiffeners. While the plates are designed to resist hydrostatic pressure, the stiffeners are designed against wind and external pressure. Axial buckling may occur due to high roof loads and wind since very thin plates are prone to a loss of stability. Test results in the 60s and 70s revealed that closely spaced ring-stiffeners may greatly enhance the axial buckling behavior, allowing for knock-down factors greater unity. However, until today, no design procedure is available allowing for adopting the beneficial effect of ring stiffeners under axial compression into practical design. In this paper a design procedure is proposed that closes this gap in current design codes. One outcome of the conducted literature study revealed that test results of unstiffened shells may be more closely approximated and is shortly presented. The design procedure for ring-stiffened shells was then developed from lower bound curves deduced from categorized buckling tests. The results of a parametrical study, that was conducted over a wide range of r/t-values, is presented. Imperfection depths up to 10t were examined using a stiffener spacing of one buckling half-wave. Especially highly slender stiffened cylinders benefit from ring-stiffening, showing up to 380% strength gains. Imperfection depths proposed by the current design code were found to be too conservative. Y1 - 2017 U6 - https://doi.org/10.1002/cepa.133 SN - 2509-7075 VL - 1 IS - 2-3 SP - 928 EP - 937 ER - TY - CHAP A1 - Pasternak, Hartmut A1 - Zivaljevic-Luxor, Natasa T1 - Evolution of an heritage edifice from colossus in Prora to colossus of Prora T2 - 3rd International Conference on Protection of Historical Constructions Y1 - 2017 SN - 978-989-8481-58-0 N1 - +CD SP - 387 EP - 388 PB - IST Press CY - Lisbon ER - TY - CHAP A1 - Stapelfeld, Christoph A1 - Launert, Benjamin A1 - Pasternak, Hartmut A1 - Doynov, Nikolay A1 - Michailov, Vesselin T1 - Numerische Festigkeitsberechnung einer versteiften Struktur unter Berücksichtigung realitätsnaher geometrischer und struktureller Imperfektionen T2 - 110 Jahre DASt und 21. DASt-Forschungskolloquium an der Technischen Universität Kaiserslautern, 6./7. März 2018 N2 - Die Festigkeitsberechnung von Strukturen, zum Beispiel Platten oder Schalen, mittels der Finite-Elemente-Methode gehört schon seit längerem zum Stand der Technik. Berücksichtigt werden bei der Berechnung sowohl geometrische Nichtlinearitäten als auch das nichtlineare Verhalten des Werkstoffs. Die geometrischen und strukturellen Imperfektionen werden bei der Ermittlung der Festigkeit zumeist in ausschließlich geometrischen Imperfektionen, wie bspw. Kombinationen aus Fertigungstoleranzen und den Ergebnissen von Beulanalysen zusammengefasst. Zur Rechtfertigung dieser Vorgehensweise werden die geometrischen Imperfektionen gemäß DIN EN 1993-1-5 erhöht. In einem Kommentar zur selben Norm findet sich ebenfalls eine Empfehlung zur Berücksichtigung von Schweißimperfektionen in Form von vereinfachten Längseigenspannungsverläufen. Diese werden in Abhängigkeit der Fließgrenzspannung des Werkstoffs bei Raumtemperatur und der Dicken der Fügepartner angenommen. Sowohl die Annahme rein geometrischer Imperfektionen als auch die Berücksichtigung vereinfachter Eigenspannungszustände, sind mit Sicherheitszuschlägen behaftet. Durch eine realitätsnähere Berücksichtigung von strukturellen und geometrischen Imperfektionen, hervorgerufen durch Schweißprozesse, kann die tatsächliche Tragfähigkeit einer Struktur wesentlich exakter bestimmt werden. Inhalt dieses Artikels ist die Anwendung eines analytisch-numerischen Hybridmodells zur Schweißimperfektionsberechnung an einer doppelt versteiften Platte und einer anschließenden Festigkeitsanalyse. Eingangs wird das analytische Modell vorgestellt und auf die grundlegenden physikalischen Zusammenhänge eingegangen. Es folgt die Erläuterung des Kopplungsalgorithmus zwischen analytischem Modell und der numerischen Berechnung. Angewendet an der doppelt versteiften Platte, wird ein realitätsnaher geometrischer und struktureller Imperfektionszustand berechnet. Eine anschließende Traglastanalyse gibt Aufschluss über das Verformungsverhalten unter achsialer Krafteinwirkung. Zur Bewertung der Ergebnisse wird ein Modell gleicher geometrischer Abmessungen und Werkstoffkennwerte aus der Literatur herangezogen. Berechnet wurden die ersten 6 Eigenformen mittels analytischer und numerischer Modelle sowie die Last-Verformungskurven unter der Annahme unterschiedlicher geometrischer Imperfektionen. Um die Vergleichbarkeit der Ergebnisse zu sichern, wird eingangs die Lagerung des Modells sowie der Kraftangriffspunkt in Längsrichtung invers, durch den Vergleich der ersten 6 Beulformen sowie der Last-Verformungskurven dreier Imperfektionen, bestimmt. Darauf aufbauen wird die Last-Verformungskurve für einen überlagerten Imperfektionszustand berechnet, wobei die geometrischen Imperfektionen aus den Fertigungstoleranzen abgeleitet und die strukturellen idealisiert, gemäß DIN EN 1993-1-5, gewählt werden. Abschließend werden alle Last-Verformungskurven einander gegenübergestellt. Anhand des Vergleichs kann quantifiziert werden, wie konservativ die einzelnen angenommenen Imperfektionen sind und wie sich der Verformungsverlauf darstellt, berechnet man diesen unter Verwendung realitätsnaher geometrischer und struktureller Imperfektionen. Y1 - 2018 SN - 978-3-941687-27-1 SP - 245 EP - 249 PB - Deutscher Ausschuß für Stahlbau DASt CY - Düsseldorf ER - TY - CHAP A1 - Jäger-Cañás, Andreas A1 - Pasternak, Hartmut T1 - Zum Tragverhalten ringversteifter Schalen unter Axialdruck T2 - 110 Jahre DASt und 21. DASt-Forschungskolloquium an der Technischen Universität Kaiserslautern, 6./7. März 2018 N2 - Ringsteifen werden typischerweise bei dünnwandigen Tanks am Mantel befestigt, um auch für starken Wind und/oder Unterdruck eine ausreichende Beulsicherheit sicherzustellen. Eine Vielzahl an Veröffentlichungen zum Thema Ringsteifen beschäftigt sich ausschließlich mit den vorher genannten Lastfällen. Dagegen ist der traglaststeigernde Einfluss der Ringsteifen im Lastfall Axialdruck kaum erforscht. Experimentell wurde vor allem in den 1960er und 1970er Jahren gegenüber unversteiften Schalen, für eng-ringversteifte ein erheblich verbessertes Tragverhalten nachgewiesen. Der eingeschränkte Parameterbereich der Untersuchungen verhindert jedoch die Anwendung der Erkenntnisse im Metallbau, wo, aufgrund der Fertigungskosten, eher wenige, dafür kräftigere Ringsteifen eingesetzt werden. Der Beitrag baut auf den experimentellen Studien als Grundlage auf und erweitert die Erkenntnisse mittels numerischer Parameterstudien von eng-ringversteiften Schalen auf Kreiszylinder mit Steifenabständen bis zum Zehnfachen der klassischen Beulhalbwellenlänge 1.73√rt. Es wird gezeigt, dass auch mit versteiften Schalen, bei denen der Steifenabstand größer als zwei Beulhalbwellenlängen ist, noch Tragfähigkeitssteigerungen gegenüber der unversteiften Schale erreicht werden können. Erwartungsgemäß sind die Zugewinne an Traglast bei enger versteiften Kreiszylindern am größten, wobei vor allem dünnwandige Strukturen von der verringerten Imperfektionssensitivität profitieren. Die Ergebnisse, angewandt auf die Baupraxis, erlauben eine wirtschaftlichere Bemessung von Tanks und Silos mit Ringsteifen, sofern Axialdruck eine bemessungsrelevante Lastsituation darstellt. Dies ist in der Regel bei überdachten Silos und windbelasteten Flachbodentanks der Fall. Dafür ist kein zusätzlicher Konstruktionsaufwand notwendig, da lediglich die ohnehin vorhandene Struktur vorteilhafter ausgenutzt wird. Y1 - 2018 SN - 978-3-941687-27-1 SP - 227 EP - 232 PB - Deutscher Ausschuß für Stahlbau DASt CY - Düsseldorf ER - TY - CHAP A1 - Ledecky, Lukas A1 - Ciupack, Yvonne A1 - Pasternak, Hartmut A1 - Geßler, Achim A1 - Feldmann, Markus ED - Virdi, Kuldeep ED - Tenhunen, Lauri T1 - Reduction of Fatigue Crack Growth Rate in Compact Tension Specimens Using Adhesively Bonded CFRP-Strips T2 - Proceedings of the METNET Seminar 2017 in Cottbus Y1 - 2018 UR - https://issuu.com/hamkuas/docs/hamk_metnet_cottbus_2017 SN - 978-951-784-794-0 SP - 30 EP - 42 PB - Häme University of Applied Sciences (HAMK) CY - Hämeenlinna ER - TY - CHAP A1 - Ciupack, Yvonne A1 - Pasternak, Hartmut A1 - Yilmaz, Emre Mehmet A1 - Sternsdorff, Florian A1 - Vayas, Ioannis ED - Virdi, Kuldeep ED - Tenhunen, Lauri T1 - Hybrid Reinforcement Measures and Innovative Measurement Methods in Steel Construction T2 - Proceedings of the METNET Seminar 2017 in Cottbus Y1 - 2018 UR - https://issuu.com/hamkuas/docs/hamk_metnet_cottbus_2017 SN - 978-951-784-794-0 SP - 43 EP - 55 PB - Häme University of Applied Sciences (HAMK) CY - Hämeenlinna ER - TY - CHAP A1 - Pasternak, Hartmut A1 - Ciupack, Yvonne A1 - Ledecky, Lukas A1 - Dilger, Klaus A1 - Stammen, Elisabeth A1 - Fischer, Vitali T1 - Untersuchungen zum Tragverhalten und der Lebensdauer von Klebverbindungen im Stahlbau unter zyklischer Belastung T2 - 18. Kolloquium Gemeinsame Forschung in der Klebtechnik, Köln, 27. - 28. Februar 2018 Y1 - 2018 SP - 62 EP - 64 PB - DECHEMA CY - Frankfurt am Main ER - TY - GEN A1 - Garifullin, Marsel A1 - Launert, Benjamin A1 - Heinisuo, Markku A1 - Pasternak, Hartmut A1 - Mela, Kristo A1 - Pajunen, Sami T1 - Effect of welding residual stresses on local behavior of rectangular hollow section joints. Part 1 - Development of numerical model T1 - Einfluss der Schweißeigenspannungen auf die Tragfähigkeit von Rechteck-Hohlprofil-Knoten. Teil 1: Entwicklung eines numerischen Modells) T2 - Bauingenieur N2 - Welded tubular joints are widely used in structural engineering due to their excellent resistance and stiffness in contrast to open sections, as well as simpler end preparation. Welding residual stresses that occur in these joints after the welding process can affect their structural behavior. Some recent experimental studies have shown that this effect can be considerable. This study numerically evaluates the influence of welding residual stresses on the behavior of rectangular hollow section T joints. The paper consists of two parts. Part I develops and validates a finite element model for the joints directly taking into account welding residual stresses by means of an upstream thermomechanical simulation of the welding process. It is proven that particular attention needs to be paid to the discretization of the model, the material properties and the adequate description of the weld heat input. The validation with experimental results shows that the developed numerical model properly captures the local structural behavior of tubular joints and can be efficiently used for further investigations. Part II employs the constructed model to investigate the effect of welding residual stresses on the resistance and initial stiffness of the considered joints. N2 - Geschweißte Hohlprofilknoten sind aufgrund besserer Festigkeits – und Steifigkeitseigenschaften im Vergleich zu offenen Profilen sowie ihrer einfacheren Fertigung weit verbreitet. Schweißeigenspannungen, die infolge des Fügens der Einzelkomponenten mittels Schweißen entstehen, können deren Tragverhalten zum Teil stark beeinflussen, was auch durch einige neuere Untersuchungen belegt wird. Dieser Beitrag beschreibt eine erweiterte Vorgehensweise für die Finite-Elemente-Modellierung am Beispiel eines T-Knotens aus Rechteckhohlprofilen. Der Beitrag gliedert sich in zwei Teile. Teil 1 beinhaltet die Entwicklung und Validierung eines numerischen Modells, welches Schweißeinflüsse durch eine vorangehende thermomechanische Simulation explizit modelliert und diese in nachfolgende Berechnungsschritte einbezieht. Dabei werden die Bedeutung einer geeigneten Vernetzung des Modells, der Materialeigenschaften und eines zutreffenden Schweißwärmeeintrags diskutiert. Die Validierung mit experimentellen Ergebnissen zeigt die Eignung des entwickelten numerischen Modells und dass dieses das lokale Tragverhalten entsprechender Knotenverbindungen korrekt erfasst. Es kann daher für nachfolgende Untersuchungen weiterverwendet werden. Teil 2 zeigt die diesbezüglich durchgeführten Parameterstudien, um die Auswirkungen der Schweißeigenspannungen auf die Tragfähigkeit und die Anfangssteifigkeit der untersuchten Knotenverbindung darzustellen. KW - Einfluss der Eigenspannungen auf Verbindungen Y1 - 2018 UR - https://www.bauingenieur.de/bauing/article.php?data[article_id]=89266 SN - 1436-4867 SN - 0005-6650 VL - 93 IS - 4 SP - 152 EP - 159 ER - TY - GEN A1 - Partov, Doncho A1 - Pasternak, Hartmut A1 - Petkov, Milen A1 - Nikolov, Radoslav A1 - Dimitrova, Antoaneta T1 - About the history of orthotropic bridge decks T2 - Annual of the University of Architecture, Civil Engineering and Geodesy, Sofia N2 - Тhe development of steel bridges after the WWII is characterized by new constructive forms like: steel roadway closed sections, new static systems considering the roadway as a plate rather than a beam grid, new computational methods covering rod statics and statics of continuum, and determining the internal forces of the roadway as internal forces of an orthotropic plate. Moreover, the main girders, the roadway and the horizontal links connect statically and constructively in a whole monolithic structure. Thus, the construction follows better the real distribution of internal forces in steel structure. Loading possibility of high-quality steel material is well used, by which the economic effect of the construction increases significantly compared to the riveted old bridges. The application of this theory in Bulgaria in the period 1976 – 1992 allowed the Bulgarian bridge construction to build several unique by their size steel road bridges of steel orthotropic decks. Y1 - 2018 SN - 1310-814X VL - 51 IS - 4 SP - 295 EP - 311 ER - TY - GEN A1 - Garifullin, Marsel A1 - Launert, Benjamin A1 - Heinisuo, Markku A1 - Pasternak, Hartmut A1 - Mela, Kristo A1 - Pajunen, Sami T1 - Effect of welding residual stresses on local behavior of rectangular hollow section joints. Part 2 – Parametric studies T1 - Einfluss der Schweißeigenspannungen auf die Tragfähigkeit von Rechteck-Hohlprofil-Knoten. Teil 2 – Parameterstudien T2 - Bauingenieur N2 - Welding residual stresses that occur in tubular joints after the welding process affect their structural behavior. To ensure that these stresses do not negatively act on the load-bearing capacity of joints, their influence should be carefully investigated. This paper represents the second part of a study that numerically evaluates the structural behavior of rectangular hollow section T joints taking into account welding residual stresses. The finite element model developed in Part 1 is now used to evaluate their effect on the resistance and initial stiffness of tubular joints. The conducted parametric analyses show that welding residual stresses have a positive influence of 1–19 % on the plastic resistance of tubular joints and insignificantly reduce their initial stiffness. At the same time, the behavior of the considered joints is found not to depend on the welding sequence. N2 - Schweißeigenspannungen können das Tragverhalten geschweißter Hohlprofilknoten zum Teil stark beeinflussen. Um mögliche negative Einflüsse auf die Tragfähigkeit auszuschließen, sollte der Eigenspannungseinfluss mitberücksichtigt werden. Dieser Beitrag bildet den zweiten Teil einer numerischen Untersuchung an geschweißten Rechteck-Hohlprofil-Knoten unter Berücksichtigung der vorgenannten Spannungen. Darin werden in Teil 1 entwickelten Modelle dazu verwendet, deren Auswirkungen auf die Tragfähigkeit und die Anfangssteifigkeit der Knotenverbindung darzustellen. Die Ergebnisse zeigen im untersuchten Parameterfeld eine Traglaststeigerung zwischen 1 % und 19 %. Die Anfangssteifigkeit wird generell nur geringfügig reduziert. Gleichzeitig wird gezeigt, dass die Schweißreihenfolge in den untersuchten Fällen keinen nennenswerten Einfluss auf die Tragfähigkeit ausübt. Y1 - 2018 UR - https://www.bauingenieur.de/bauing/article.php?data[article_id]=89481 SN - 1436-4867 SN - 0005-6650 VL - 93 IS - 5 SP - 207 EP - 213 ER - TY - GEN A1 - Li, Zheng A1 - Launert, Benjamin A1 - Pasternak, Hartmut T1 - Application of the stochastic finite element method in welding simulation T2 - Welding in the World N2 - Due to the uncertain microscopic structure of the material, the strength of the material exhibits strong randomness. This randomness results in uncertain response of the structure in the sequentially coupled thermal-mechanical analysis by welding simulation. Because of the limitations of deterministic welding simulation, the stochastic finite element method with random field will be introduced into the welding simulation, so that the welded structure can be more accurately calculated in the stability and reliability structural analysis. Particularly, it is necessary to propose reasonable distributions of residual stress from welding simulations based on statistical and reliability theories. This paper is intended to implement the stochastic finite element method in the welding simulation using a general-purpose simulation program and to demonstrate the potential of the proposed approach. Furthermore, the statistical distribution function of the welding simulation response is obtained by maximum entropy fitting method. Then, a numerical example is presented by the proposed method. Y1 - 2018 UR - https://rdcu.be/NT9F U6 - https://doi.org/10.1007/s40194-018-0596-4 SN - 0043-2288 SN - 1878-6669 VL - 62 IS - 5 SP - 905 EP - 912 ER - TY - CHAP A1 - Garifullin, Marsel A1 - Launert, Benjamin A1 - Heinisuo, Markku A1 - Pasternak, Hartmut A1 - Mela, Kristo A1 - Pajunen, Sami T1 - Effect of Welding Residual Stresses on Behavior of Tubular T Joints T2 - 17th International Conference on Computing in Civil and Building Engineering N2 - Welded tubular joints are widely used in structural engineering due to their excellent resistance and stiffness, as well as simple connection. However, the welding process induces residual stresses in the welding area that can affect the structural behavior of joints. Currently very few papers investigate welding residual stresses in relation to tubular joints. This paper develops a finite element model of rectangular hollow section T joints considering welding residual stresses. Attention is paid particularly to welding sequences. The developed model is used to evaluate the effect of welding residual stresses on the resistance and initial stiffness of tubular joints. The results show that welding residual stresses increase the plastic resistance of rectangular hollow section joints under in-plane bending and axial brace loading. Y1 - 2018 UR - http://programme.exordo.com/icccbe2018/delegates/presentation/267/ UR - https://icccbe2018.exordo.com/files/papers/104/final_draft/Effect_of_Welding_Residual_Stresses_on_Behavior_of_Tubular_T_Joints.pdf ER - TY - CHAP A1 - Zivaljevic-Luxor, Natasa A1 - Pasternak, Hartmut T1 - Roofs for archaeological sites integration into public space of metropolitan area T2 - International Scientific Conference, Nis, Serbia, 31.08-01-09.2018 Y1 - 2018 UR - https://www.b-tu.de/fg-stahlbau/publikationen/veroeffentlichungen ER - TY - CHAP A1 - Jäger-Cañás, Andreas A1 - Pasternak, Hartmut T1 - On the buckling behavior of ring-stiffened shells under axial compression T2 - 8th International Conference on Thin-Walled Structures, ICTWS 2018, Lisbon, Portugal, July 24-27, 2018 Y1 - 2018 UR - https://www.b-tu.de/fg-stahlbau/publikationen/veroeffentlichungen ER - TY - CHAP A1 - Loebjinski, Maria A1 - Rug, Wolfgang A1 - Pasternak, Hartmut ED - Rug, Wolfgang T1 - Aktuelle Normen für den Bestandsbau mit Holz und beispielhafte Zuverlässigkeitsuntersuchungen T2 - Holzbau im Bestand - historische Holztragwerke : Beispiele für substanzschonende Erhaltung Y1 - 2018 SN - 978-3-410-28175-7 SP - 162 EP - 192 PB - Beuth Verlag CY - Berlin ER - TY - CHAP A1 - Loebjinski, Maria A1 - Rug, Wolfgang A1 - Pasternak, Hartmut T1 - Possibilities for a modification of partial safety factors for existing timber structures T2 - World Conference on Timber Engineering, Seoul, 20 - 23 Aug 2018 Y1 - 2018 UR - https://indico.conference4me.psnc.pl/event/171/session/347/contribution/136/material/paper/1.pdf ER - TY - CHAP A1 - Partov, Doncho A1 - Pasternak, Hartmut A1 - Grekov, Petar A1 - Nikolov, Radoslav A1 - Dimitrova, Antoaneta T1 - About the Theory of Orthotropic Steel Plate Established by Wilhelm Cornelius and its Application for Analysis of Two Steel Bridges With Orthotropic Decks in Varna T2 - X Jubilee International Scientific Conference „Civil Engineering Design and Construction“, Sept. 20-22, 2018, Varna, Bulgaria Y1 - 2018 UR - https://www.b-tu.de/fg-stahlbau/publikationen/veroeffentlichungen SP - 469 EP - 481 ER - TY - CHAP A1 - Loebjinski, Maria A1 - Köhler, Jochen A1 - Rug, Wolfgang A1 - Pasternak, Hartmut ED - Caspeele, Robby ED - Taerwe, Luc ED - Frangopol, Dan M. T1 - Development of an optimization-based and practice orientated assessment scheme for the evaluation of existing timber structures T2 - Life-Cycle Analysis and Assessment in Civil Engineering: Towards an Integrated Vision Y1 - 2019 SN - 978-1-138-62633-1 SN - 978-1-315-22891-4 SP - 353 EP - 360 PB - Taylor & Francis Group CY - London ER - TY - CHAP A1 - Stapelfeld, Christoph A1 - Launert, Benjamin A1 - Pasternak, Hartmut A1 - Doynov, Nikolay A1 - Michailov, Vesselin ED - Seefeldt, Marc T1 - Strength Calculation of Stiffened Structures Taking Into Consideration Realistic Weld Imperfections T2 - European Conference on Residual Stresses 2018, ECRS-10, Leuven, Belgium, 11-14th September, 2018 N2 - The topic of this article is the application of an analytical numerical hybrid model for a realistic prediction of imperfections induced by welds. At the beginning, the analytical model, its physical basis as well as the physical interrelationships are explained. This is followed by the explanation of the coupling procedure between the analytical model and the numerical calculation. Afterwards, the coupled hybrid model is applied on the investigated stiffened curved structure for the determination of the weld imperfections. An ultimate load analysis gives information about the load carrying behavior under axial loading. The results are compared against the traditional approach using eigenmode-based imperfections. The comparison underlines the potential additional utilization of load bearing capacity by this new approach. Y1 - 2018 SN - 978-1-945291-88-3 SN - 978-1-945291-89-0 U6 - https://doi.org/10.21741/9781945291890-39 SP - 245 EP - 250 PB - Materials Research Forum LLC CY - Millersville, PA ER - TY - GEN A1 - Zebinger, Markus A1 - Gierat, Marek A1 - Pasternak, Hartmut A1 - Krausche, Thomas T1 - Das Seilnetzdach der Schierker Feuerstein Arena im Harz Teil 2: Herstellung, Montage und Schweißsimulation T2 - Bauingenieur N2 - Die Stadt Wernigerode in Sachsen-Anhalt errichtete im Ortsteil Schierke eine Multifunktionsarena. Am Fuße des Brockens, dem höchsten Berg des Harzes und ganz Norddeutschlands gelegen, fügt sich die offene Überdachung in die vorhandene Topologie nahtlos ein. Das unter Denkmalschutz stehende Natureisstadion, mit seinen bestehenden Natursteinterrassen und einem Schiedsrichterturm aus Holz, wurde baulich so konzipiert, dass die Arena in den Wintermonaten als überdachte Kunsteisbahn und im Sommer als Fläche für Konzerte, Aufführungen und Sportveranstaltungen genutzt werden kann. Eine ganz besondere Herausforderung war die Herstellung und Montage des circa 190m langen geschweißten Stahlrandträgers. Der Hohlkasten besteht aus vier doppelt gekrümmten Blechen und lagert an lediglich zwei Fußpunkten auf. Der zweite Teil des Beitrags befasst sich mit Schweißeigenspannungen an einem ausgewählten Querschnitt der Überdachung. Y1 - 2018 SN - 0005-6650 VL - 93 IS - 10 SP - 383 EP - 391 ER - TY - GEN A1 - Stapelfeld, Christoph A1 - Launert, Benjamin A1 - Pasternak, Hartmut A1 - Doynov, Nikolay A1 - Michailov, Vesselin T1 - Traglastberechnung versteifter Platten und Schalen unter Berücksichtigung realer Schweißimperfektionen T2 - Bauingenieur N2 - Imperfektionen, die bei Traglastberechnungen Berücksichtigung finden müssen, haben ihre Ursachen in Herstellungs- und Fertigungstoleranzen oder werden durch das Schweißen und den damit zumeist einhergehenden Nachbehandlungen in den Bauteilen hervorgerufen. Durch die Wärmewirkung des Schweißens entstehen sowohl sehr große Verformungen als auch signifikante Zug und Druckspannungen. Der strukturelle und geometrische Imperfektionsgrad wird somit maßgeblich von der Anzahl und der Lage der Schweißnähte sowie den Schweißparametern bestimmt. Für die Berücksichtigung in Traglastberechnungen ist ein physikalisch fundiertes Modell erforderlich, welches die Schweißimperfektionen schnell und präzise berechnet. Das gekoppelte analytisch numerische Hybridmodell erfüllt diese Kriterien. Die mathematischen Grundlagen des analytischen Modells sowie die Kopplung mit der numerischen Finite-Elemente-Berechnung werden eingangs vorgestellt und die Anwendung zur Berechnung von Verzügen an einer Schiffsektion demonstriert. Darauffolgend wird das Hybridmodell an einer eben und einer gekrümmten versteiften Platte zur Berechnung der Schweißimperfektionen angewendet. Anschließende Traglastberechnungen sowie der Vergleich mit den Ergebnissen unter der Annahme einer geometrischen Ersatzimperfektion in Form des kritischsten Eigenwerts gibt Auskunft darüber, welches Potenzial die realitätsnahe direkte Berücksichtigung von Schweißimperfektionen birgt. Y1 - 2018 SN - 0005-6650 VL - 93 IS - 10 SP - 403 EP - 411 ER - TY - CHAP A1 - Li, Zheng A1 - Pasternak, Hartmut A1 - Partov, Doncho ED - Jendželovský, Norbert ED - Grmanová, Alžbeta T1 - Influence of statistical size effect in steel on structural safety T2 - Proceedings of 16th International Conference on New Trends in Statics and Dynamics of Buildings N2 - This paper present the investigation of the statistical size effect in steel structure and the corresponding reliability. This study described the randomness of material properties through two different ways. These two proposed simulation methods, which are an extension and supplement to traditional simulation methods, can effectively simulate the statistical size effect for the tensile and flexural components in steel structures. The test results show that the variations of the yield and tensile strength increase with the decreasing specimen volume. Besides, the structural component strength is not only related to the specimen volume, but also the stress distribution. It is found by studying the influence of statistical size effect on structural reliability that the strength, which is obtained by small specimens through statistical analysis in the laboratory, is no more accurately applicable to large construction. The core idea is that the stochastic material proper-ties are directly embedded in mechanical calculations to develop a more accurate and economical design method for steel structure. KW - Statistical size effect KW - Steel structure KW - Stochastic material model KW - Stochastic FEM KW - Structural safety Y1 - 2018 UR - http://www.newtrends.sk/dokumenty/proceedings_2018.pdf SN - 978-80-227-4845-2 PB - Slovak University of Technology CY - Bratislava ER - TY - CHAP A1 - Ledecky, Lukas A1 - Ciupack, Yvonne A1 - Pasternak, Hartmut A1 - Geßler, Achim A1 - Feldmann, Markus A1 - Kasper, Yann A1 - Albiez, Matthias A1 - Ummenhofer, Thomas T1 - Untersuchungen zur Ermüdungsrisssanierung mit aufgeklebten CFK-Lamellen im Stahlbau T2 - 110 Jahre DASt und 21. DASt-Forschungskolloquium an der Technischen Universität Kaiserslautern Y1 - 2018 SN - 978-3-941687-27-1 SP - 116 EP - 121 PB - Deutscher Ausschuß für Stahlbau DASt CY - Düsseldorf ER - TY - GEN A1 - Moradi, Milad A1 - Pasternak, Hartmut T1 - A Study on the Influence of Various Welding Sequence Schemes on the Gain in Strength of Square Hollow Section Steel T-Joint T2 - Journal of Welding and Joining Y1 - 2017 U6 - https://doi.org/10.5781/JWJ.2017.35.4.7 SN - 2466-2232 SN - 2466-2100 VL - 35 IS - 4 SP - 41 EP - 50 ER - TY - CHAP A1 - Stapelfeld, Christoph A1 - Launert, Benjamin A1 - Pasternak, Hartmut A1 - Doynov, Nikolay A1 - Michailov, Vesselin T1 - The Influence of Geometrical and Welding Imperfections on the Strength of Stiffened Structures T2 - High Performance Steel Structures Research Council (HPSSRC), Delft, Netherlands, 2018 N2 - The strength calculation of stiffened plates and shells via finite element simulation has been part of the state of the art for a long time. Geometrical nonlinearities as well as the nonlinear material behavior are considered within the calculation. To simplify, both types of imperfections, geometrical and structural ones, are mostly combined in these strength calculations being considered as equivalent geometrical imperfections. Values for standard cases are included in EN 1993-1-5 in case of plated structures or 1-6 in case of shells. A second possibility is the separate definition of fabrication tolerances and residual stresses, as far as they are known. With increasing complexity of the structure, less information are however available on geometrical and particularly structural imperfections. Nevertheless, by means of a more realistic consideration of these values, the actual ultimate load can be determined significantly more exactly and the performance of high performance steel structures is increased. In the investigated cases, deformations and stresses arise mainly due to welding. Therefore, the topic of this article is the application of an analytical numerical hybrid model for predicting imperfections induced by welds. This is presented on an example of a stiffened steel structure and a subsequent ultimate load calculation. At the beginning the analytical model, its physical basis as well as the physical interrelationships are introduced and explained. This is followed by the explanation of the coupling procedure between the analytical model and the numerical calculation for the calculation of weld-induced deformations and residual stresses. The significance of the hybrid model is proven by means of a few sample applications. For a realistic determination of the weld imperfections in the investigated stiffened structure, the coupled hybrid model is used afterwards. An ultimate load analysis gives information about the load carrying behavior under axial loading. The results are compared with the results of an ultimate load analysis from a literature example assuming different eigenvalues with different scaling. The results underline the potential additional utilization of load bearing capacity by this new approach. KW - Welding KW - Stresses KW - Strains KW - Imperfections KW - Stiffened Structures KW - Distortions Y1 - 2018 UR - https://www-docs.b-tu.de/fg-stahlbau/public/Fachgebiet_Stahlbau/publikationen/Workshop_Proceedings_of_HPSSRC-updated_cs.pdf SP - 191 EP - 201 ER - TY - GEN A1 - Ledecky, Lukas A1 - Ciupack, Yvonne A1 - Pasternak, Hartmut A1 - Fischer, Vitali A1 - Stammen, Elisabeth A1 - Dilger, Klaus T1 - Lebensdauer von zyklisch beanspruchten Klebverbindungen im Stahlbau -Teil 1: Einflüsse auf das Tragverhalten T2 - Bauingenieur Y1 - 2019 SN - 0005-6650 VL - 94 IS - 1 SP - 29 EP - 35 ER - TY - GEN A1 - Ciupack, Yvonne A1 - Ledecky, Lukas A1 - Pasternak, Hartmut A1 - Fischer, Vitali A1 - Stammen, Elisabeth A1 - Dilger, Klaus T1 - Lebensdauer von zyklischen beanspruchten Klebverbindungen im Stahlbau - Teil 2: Untersuchungen zur Betriebsfestigkeitsprüfung einer Klebverbindung T2 - Bauingenieur Y1 - 2019 SN - 0005-6650 VL - 94 IS - 2 SP - 56 EP - 62 ER - TY - GEN A1 - Li, Zheng A1 - Pasternak, Hartmut T1 - Statistical size effect of flexural members in steel structures T2 - Journal of Constructional Steel Research N2 - This paper presents the results of theoretical and experimental investigations on the statistical size effect (SSE) of flexural members in steel. The chain of bundle model is developed, which is based on a stochastic material model by Weibull and lognormal distribution. Furthermore, this model is embedded into the finite element method (FEM) software for the analysis of a complicated structure with a stress gradient. In order to determine the stochastic material model parameters, uniaxial tensile tests were carried out based on specimens using the same steel with different sizes. By comparing the experimental and simulation results, the material parameters could be analyzed based on the relationship between the specimen sizes and strength. Moreover, the 3-point and 4-point bending tests were performed and simulated with the developed model. The experimental and simulation results demonstrate that the SSE also exists in the flexural member, and the equivalent yield stress is closely related to the stress distribution and volume of the structure component. Y1 - 2018 U6 - https://doi.org/10.1016/j.jcsr.2018.01.025 SN - 0143-974X VL - 144 SP - 176 EP - 185 ER - TY - GEN A1 - Li, Zheng A1 - Pasternak, Hartmut T1 - Experimental and numerical investigations of statistical size effect in S235JR steel structural elements T2 - Construction and Building Materials N2 - This paper presents the analysis of the statistical size effect in steel structural elements using the stochastic finite element (FE) method. The three-dimensional random field theory is applied to simulate the uncertainty of a nonlinear material. The proposed approach, which combines the discrete random field describing the randomness of the material properties via Monte Carlo simulations, is used for computing the bearing capacity variability of the steel structures. In addition, the mapping interpolation method makes it possible to separate the random field mesh and FE model mesh. The three-dimensional random field for the material properties is established according to the yield strength with a lognormal distribution based on reasonable assumptions, and the corresponding random field parameters are studied. Finally, the results of experimental investigation and simulations are compared based on the tensile and bending tests, and they indicate that the statistical size effect cannot be overlooked in S235JR steel structural elements and that the use of stochastic FE in the analysis of the statistical size effect has tremendous potential. KW - 3D Random field KW - Stochastic finite element method KW - Mapping interpolation method KW - Statistical size effect KW - Steel structural elements Y1 - 2019 U6 - https://doi.org/10.1016/j.conbuildmat.2019.02.106 SN - 0950-0618 VL - 206 SP - 665 EP - 673 ER - TY - GEN A1 - Ciupack, Yvonne A1 - Pasternak, Hartmut A1 - Geßler, Achim A1 - Feldmann, Markus A1 - Kasper, Yann A1 - Albiez, Matthias A1 - Ummenhofer, Thomas T1 - Repair of Fatigue Cracked CT-specimens Using Adhesively Bonded CFRP Lamellas T2 - 27th Annual International Conference on Composites / Nano Engineering ICCE-27 Y1 - 2019 UR - https://www.b-tu.de/fg-stahlbau/publikationen/veroeffentlichungen ER - TY - GEN A1 - Ciupack, Yvonne A1 - Pasternak, Hartmut T1 - Some Remarks about the New Generation of prEN 1993-1-1 T2 - 27th Annual International Conference on Composites / Nano Engineering ICCE-27 Y1 - 2019 UR - https://www.b-tu.de/fg-stahlbau/publikationen/veroeffentlichungen ER - TY - GEN A1 - Tankova, Trayana A1 - Silva, Luís Simões da A1 - Balakrishnam, Marimuthu A1 - Rodrigues, Dulce A1 - Launert, Benjamin A1 - Pasternak, Hartmut A1 - Tun, Tin Yadanar T1 - Residual stresses in welded I section steel members T2 - Engineering Structures N2 - Residual stresses have major influence on the stability of steel members. It is well-known that, due to the differences in manufacturing procedures, the residual stresses for welded and hot – rolled members are rather different. In the same way, despite several studies on residual stresses distribution and magnitude for hot-rolled members were already done, for prismatic and tapered welded I section steel members the investigation is still very scarce. In the current work, an experimental programme on the buckling resistance of tapered members, with different tapering ratios and section heights, was conducted and residual stress measurements were carried out using the sectioning method. Numerical simulations of the heat input during welding were also performed in order to predict the residual stress fields. A statistical analysis of the residual stresses distribution for welded I section members was performed, using the experimental and numerical results, as well as literature data. Systematized information on residual stresses distribution and magnitude was generated and some guidelines for the statistical characterization of residual stresses in welded members were proposed. KW - Residual stresses KW - Welded sections KW - Steel KW - Eurocode 3 KW - Stability KW - Welding simulation KW - I section KW - Experimental tests Y1 - 2019 U6 - https://doi.org/10.1016/j.engstruct.2019.109398 SN - 0141-0296 VL - 197 ER - TY - GEN A1 - Doynov, Nikolay A1 - Stapelfeld, Christoph A1 - Michailov, Vesselin A1 - Pasternak, Hartmut A1 - Launert, Benjamin ED - Sommitsch, Christof ED - Enzinger, Norbert ED - Mayr, Peter T1 - Distortion analysis of large scaled welded structures T2 - Mathematical Modelling of Weld Phenomena 12 : selected peer reviewed papers from the 12th International Seminar Numerical Analysis of Weldability : September 23-26, 2018, Graz, Schloss Seggau - Austria N2 - The work presents an innovative approach for simulation of welding induced distortions, which allows taking into consideration the local effects of the welding process as well as the global interactions in the structure. The approach bases on an integration of analytical and numerical calculation’s procedures in a hybrid model, realized with the aid of the inherent strain concept. The analytical procedure calculates the shrinkage strain components and area of the plastic deformed zone, caused by welding. The calculated strains are then transferred to the global finite element model in order to predict the distortions and stresses in the structure after every welding stage, as well as their final state. The consideration of welding scenarios, weld sequence, clamping conditions and the assembling stages is done by taking into account the intermediate variation of the strain state during the manufacturing steps. The article gives the theoretical basis of the analytical model. The consideration of the essential physical relations is put into discussion. The application of the model is illustrated on complex structures. Its reliability and practicability are demonstrated by means of a validation study. Y1 - 2019 SN - 978-3-85125-615-4 U6 - https://doi.org/10.3217/978-3-85125-615-4 SP - 254 EP - 280 PB - Verlag der Technischen Universität Graz CY - Graz ER - TY - GEN A1 - Pasternak, Hartmut A1 - Krausche, Thomas ED - Zingoni, Alphose T1 - Details and assembly of two cladded double curved cable net roofs T2 - Advances in engineering materials, structures and systems : innovations, mechanics and applications : proceedings of the 7th International Conference on Structural Engineering, Mechanics, and Computation (SEMC 2019), September 2-4, 2019, Cape Town, South Africa Y1 - 2019 SN - 978-1-138-38696-9 SP - 896 EP - 901 PB - Taylor & Francis Group CY - London ER - TY - GEN A1 - Launert, Benjamin A1 - Li, Zheng A1 - Pasternak, Hartmut ED - Zingoni, Alphose T1 - Development of a new method for the direct numerical consideration of welding effects in the component design of welded plate girders T2 - Advances in engineering materials, structures and systems : innovations, mechanics and applications : proceedings of the 7th International Conference on Structural Engineering, Mechanics, and Computation (SEMC 2019), September 2-4, 2019, Cape Town, South Africa Y1 - 2019 SN - 978-1-138-38696-9 SP - 1143 EP - 1147 PB - Taylor & Francis Group CY - London ER - TY - GEN A1 - Li, Zheng A1 - Pasternak, Hartmut A1 - Ciupack, Yvonne ED - Zingoni, Alphose T1 - Artificial neural network prediction of bearing capacity of welded columns based on simplified welding simulations T2 - Advances in engineering materials, structures and systems : innovations, mechanics and applications : proceedings of the 7th International Conference on Structural Engineering, Mechanics, and Computation (SEMC 2019), September 2-4, 2019, Cape Town, South Africa Y1 - 2019 SN - 978-1-138-38696-9 SP - 1219 EP - 1223 PB - Taylor & Francis Group CY - London ER - TY - GEN A1 - Kasper, Yann A1 - Albiez, Matthias A1 - Ummenhofer, Thomas A1 - Ciupack, Yvonne A1 - Ledecky, Lukas A1 - Pasternak, Hartmut A1 - Geßler, Achim A1 - Feldmann, Markus ED - Zingoni, Alphose T1 - Application of carbon fibre composite materials for the rehabilitation of fatigue damaged steel structures T2 - Advances in engineering materials, structures and systems : innovations, mechanics and applications : proceedings of the 7th International Conference on Structural Engineering, Mechanics, and Computation (SEMC 2019), September 2-4, 2019, Cape Town, South Africa Y1 - 2019 SN - 978-1-138-38696-9 SP - 2148 EP - 2153 PB - Taylor & Francis Group CY - London ER - TY - GEN A1 - Stapelfeld, Christoph A1 - Launert, Benjamin A1 - Pasternak, Hartmut A1 - Doynov, Nikolay A1 - Michailov, Vesselin T1 - Improve load capacity calculations by considering realistic imperfections induced by welding for plates and shells T2 - Stability and ductility of steel structures 2019 : proceedings of the International Colloquia on Stability and Ductility of Steel Structures (SDSS 2019), September 11-13, 2019, Prague, Czech Republic Y1 - 2019 UR - https://www.b-tu.de/fg-stahlbau/publikationen/veroeffentlichungen SN - 978-0-367-33503-8 SP - 1059 EP - 1067 PB - CRC Press CY - Boca Raton ER - TY - GEN A1 - Shoushtarian Mofrad, Ashkan A1 - Shlychkova, Darita A1 - Ciupack, Yvonne A1 - Pasternak, Hartmut T1 - FE Modelling of Sandwich Panels with Screwed Joint at Elevated Temperatures T2 - XVIII ANNIVERSARY INTERNATIONAL SCIENTIFIC CONFERENCE BY CONSTRUCTION AND ARCHITECTURE VSU'2018, At Sofia, Bulgaria N2 - Understanding and predicting sandwich structure behavior in fire has been of particular interest to researchers for a long time. Sandwich panel joints are playing an important role since they not only connect sandwiches to a bearing structure, but also play a key role in stabilization of the whole building. This paper presents an investigation of a sandwich panel behavior. The sandwich panel consist of two steel layers and PIR core between them and is connected to a HEA 160 flange with the help of a screw. Using ABAQUS software, this connection is modelled and deformation fields with temperature distribution area are analyzed. The modelling process includes many stages associated with each other: static, heat transfer and sequential analysis that includes both previous analyses. Y1 - 2018 UR - https://www.researchgate.net/publication/342522191_FE_MODELLING_OF_SANDWICH_PANELS_WITH_SCREWED_JOINT_AT_ELEVATED_TEMPERATURES ER - TY - GEN A1 - Shlychkova, Darita A1 - Pasternak, Hartmut T1 - Numerical analysis and laboratory experiments of lightweight structured sandwich beams made of steel T2 - Proceedings VII International Scientific Conference VSU 2017, 8-9 Juni 2017, Sofia, Bulgaria N2 - Using special technology it is possible to produce thin steel plates with a 3-D structure - hexagonal staggered pattern. Such sheets find a range of application in automotive and aerospace industry. The question is: Can we use those sheets also for building applications? Therefore their behaviour under external loads has to be studied. As an example beams with C-section made of structured sheets under concentrated force in the middle of the upper flange are investigated. This article provides information about load capacity of beams, assembled from structured plates with different thickness. Using Abaqus software beams were modelled and deformation fields for each of them were analyzed. To compare computer calculations with actual results, real sized beams made of structured sheets were constructed in laboratory and bending tests were conducted. Y1 - 2017 SN - 1314-071X VL - Volume 1 SP - 252 EP - 260 CY - Sofia, Bulgaria ER - TY - GEN A1 - Pasternak, Hartmut A1 - Li, Zheng A1 - Stapelfeld, Christoph A1 - Jäger-Cañás, Andreas A1 - Launert, Benjamin T1 - Considering realistic weld imperfections in load bearing capacity calculations of ring-stiffened shells using the analytical numerical hybrid model T2 - Stability and Ductility of Steel Structures 2019 : Proceedings of the International Colloquia on Stability and Ductility of Steel Structures (SDSS 2019), September 11-13, 2019, Prague, Czech Republic Y1 - 2019 SN - 978-0-429-32024-8 SN - 978-0-367-33503-8 U6 - https://doi.org/10.1201/9780429320248 SP - 882 EP - 889 PB - CRC Press CY - London ET - 1st Edition ER - TY - GEN A1 - Jäger-Cañás, Andreas A1 - Li, Zheng A1 - Pasternak, Hartmut T1 - Axial buckling behavior of welded ring-stiffened shells T2 - Stability and Ductility of Steel Structures 2019 : Proceedings of the International Colloquia on Stability and Ductility of Steel Structures (SDSS 2019), September 11-13, 2019, Prague, Czech Republic Y1 - 2019 SN - 978-0-429-32024-8 SN - 978-0-367-33503-8 U6 - https://doi.org/10.1201/9780429320248 SP - 556 EP - 563 PB - CRC Press CY - London ET - 1st Edition ER - TY - GEN A1 - Loebjinski, Maria A1 - Rug, Wolfgang A1 - Pasternak, Hartmut T1 - The influence of an improved strength grading in situ on modelling timber strength properties T2 - Proceedings of the International Conference on Structural Health Assessment of Timber Structures, SHATiS´2019 Y1 - 2019 SN - 978-989-54496-2-0 SP - 619 EP - 628 PB - Universidade do Minho Departamento de Engenharia Civi CY - Guimarães, Portugal ER - TY - GEN A1 - Loebjinski, Maria A1 - Linke, Gunter A1 - Rug, Wolfgang A1 - Pasternak, Hartmut T1 - Redevelopment of a wooden roof construction under preservation order T2 - Proceedings of the International Conference on Structural Health Assessment of Timber Structures, SHATiS´2019 Y1 - 2019 SN - 978-989-54496-2-0 SP - 912 EP - 921 PB - Universidade do Minho Departamento de Engenharia Civi CY - Guimarães, Portugal ER - TY - GEN A1 - Loebjinski, Maria A1 - Linke, Gunter A1 - Rug, Wolfgang A1 - Pasternak, Hartmut T1 - Evaluation of existing timber structures – Current standards for the assessment and evaluation in Germany and Europe T2 - Proceedings of the International Conference on Structural Health Assessment of Timber Structures, SHATiS´2019 Y1 - 2019 SN - 978-989-54496-2-0 SP - 884 EP - 893 PB - Universidade do Minho Departamento de Engenharia Civi CY - Guimarães, Portugal ER - TY - GEN A1 - Feldmann, Markus A1 - Ummenhofer, Thomas A1 - Geßler, Achim A1 - Pasternak, Hartmut A1 - Kasper, Yann A1 - Albiez, Matthias A1 - Ciupack, Yvonne A1 - Ledecky, Lukas T1 - Einsatz geklebter CFK-Lamellen zur Verstärkung ermüdungsgeschädigter Stahlkonstruktionen T2 - Schweissen und Schneiden: Fachzeitschrift für Schweißen und verwandte Verfahren Y1 - 2019 SN - 0036-7184 IS - 11 SP - 738 EP - 745 ER - TY - GEN A1 - Ciupack, Yvonne A1 - Ledecky, Lukas A1 - Kasper, Yann A1 - Geßler, Achim A1 - Albiez, Matthias A1 - Pasternak, Hartmut A1 - Ummenhofer, Thomas A1 - Feldmann, Markus ED - Juozapaitis, Algirdas ED - Daniūnas, Alfonsas ED - Juknevičius, Linas T1 - Strengthening of steel structures with fatigue cracks using adhesively bonded non-prestressed and prestressed CFRP lamellas T2 - The 13th International Conference MODERN BUILDING MATERIALS, STRUCTURES AND TECHNIQUES, 16–17 May 2019, Vilnius, Lithuania Vilnius Gediminas Technical University N2 - In comparison to classic strengthening methods of fatigue-damaged steel structures, adhesively bonded CFRP lamellas show several advantages. Compared to bolted reinforcement measures and the drilling of the crack tip, crosssectional weakening is avoided. Heat-induced, negatively acting residual stresses and distortions, usually occurring during repair welding, can also be excluded. Therefore, the effectiveness of adhesively bonded CFRP lamellas to enhance the remaining lifetime of fatigue damaged steel structures is examined in a German research project. Selected results are presented in this paper. To characterize the steel, CFRP and adhesive materials, different tests on small scale specimens are carried out. With the help of fatigue tests on CT-samples the remaining fatigue lifetimes of specimens strengthened with adhesively bonded CFRP lamellas is compared to the remaining lifetimes of specimens strengthened by established methods such as drilling the crack tip and repair welding. Based on the evaluation of the crack propagation after the rehabilitation measures, the great potential of adhesively bonded CFRP reinforcements can be deduced. By prestressing the lamellas, the remaining lifetime can generally be increased further. The combination of adhesively bonded CFRP lamellas together with established rehabilitation methods shows a particularly high positive influence on the remaining lifetime of the CT-specimens. Y1 - 2019 SN - 978-609-476-197-3 U6 - https://doi.org/10.3846/mbmst.2019.068 SN - 2029-9915 SP - 252 EP - 260 ER - TY - GEN A1 - Loebjinski, Maria A1 - Rug, Wolfgang A1 - Pasternak, Hartmut T1 - The Influence of Improved Strength Grading In Situ on Modelling Timber Strength Properties T2 - Buildings : open access journal Y1 - 2020 U6 - https://doi.org/10.3390/buildings10020030 SN - 2075-5309 VL - 10 IS - 2 ER - TY - GEN A1 - Sternsdorff, Florian A1 - Ciupack, Yvonne A1 - Yilmaz, Emre Mehmet A1 - Pasternak, Hartmut A1 - Vayas, Ioannis T1 - Investigations on beam-to-column connections reinforced with adhesively bonded CFRP lamellas T2 - 7th International Conference Civil Engineering – Science and Practice (GNP), Kolašin, 10.-14. March 2020, Book of abstracts N2 - Against the background of the earthquake-proof design of steel structures, it makes sense to use structures with sufficient ductility and energy dissipation capacity. The joints are often a weak point in such systems. Methods for reinforcing beam-to-column connections with the aid of adhesively bonded CFRP products are the subject of the work. Advantages of such reinforcement methods are the avoidance of residual stresses (compared to welded steel lamellas), avoidance of cross-sectional weakening (in comparison to bolted solutions) and, above all, the possibility of retrofitting existing steel structures. Y1 - 2020 UR - https://www.researchgate.net/publication/340165474_INVESTIGATIONS_ON_BEAM-TO-COLUMN_CONNECTIONS_REINFORCED_WITH_ADHESIVELY_BONDED_CFRP_LAMELLAS ER - TY - GEN A1 - Pasternak, Hartmut A1 - Krausche, Thomas T1 - Design, Construction and Assembly of two Membrane-Cladded Double-Curved Net Roofs T2 - 7th International Conference Civil Engineering – Science and Practice (GNP), Kolašin, 10-14 March 2020, Book of abstracts Y1 - 2020 UR - https://de.scribd.com/document/463209242/Pasternak-Krausche-GNP2020-pdf ER - TY - GEN A1 - Shoushtarian Mofrad, Ashkan A1 - Shlychkova, Darita A1 - Ciupack, Yvonne A1 - Pasternak, Hartmut T1 - Study of Bending, Translational and Torsional Stiffness of Sandwich Panels in Fire T2 - 7th International Conference Civil Engineering – Science and Practice (GNP), Kolašin, 10-14 March 2020, Book of abstracts Y1 - 2020 UR - https://www.researchgate.net/publication/340163960_2020_GNP_sandwich_panels_in_fire ER - TY - GEN A1 - Kasper, Yann A1 - Albiez, Matthias A1 - Ciupack, Yvonne A1 - Geßler, Achim A1 - Ummenhofer, Thomas A1 - Pasternak, Hartmut A1 - Feldmann, Markus T1 - Verstärkung von ermüdungsbeanspruchten Stahlbauteilen mit aufgeklebten CFK-Lamellen - Teil 1: Grundlagen T2 - Bauingenieur Y1 - 2020 SN - 0005-6650 VL - 95 IS - 3 SP - 79 EP - 84 ER - TY - GEN A1 - Kasper, Yann A1 - Albiez, Matthias A1 - Ciupack, Yvonne A1 - Geßler, Achim A1 - Ummenhofer, Thomas A1 - Pasternak, Hartmut A1 - Feldmann, Markus T1 - Verstärkung von ermüdungsbeanspruchten Stahlbauteilen mit aufgeklebten CFK-Lamellen - Teil 2: Experimentelle Rissfortschrittsuntersuchungen T2 - Bauingenieur Y1 - 2020 SN - 0005-6650 VL - 95 IS - 5 SP - 166 EP - 173 ER - TY - GEN A1 - Dong, Jiwu A1 - Li, Zheng A1 - Pasternak, Hartmut A1 - Ciupack, Yvonne T1 - Reinforcement of Fatigue Damaged Steel Structures Using CFRP Lamellas - Part 3: Numerical Simulation T2 - Bauingenieur Y1 - 2020 SN - 0005-6650 SN - 1436-4867 VL - 96 IS - 10 SP - 362 EP - 368 ER - TY - GEN A1 - Pasternak, Hartmut A1 - Ciupack, Yvonne ED - Georgiev, Vanyo ED - Stoynova, Iliana T1 - Use of CFRP for the Rehabilitation of Fatigue Damaged Steel Structures - Only a Nice Idea? T2 - XX International Scientific Conference VSU'2020 on Construction and Architecture Book of Abstracts Y1 - 2020 UR - https://www-docs.b-tu.de/fg-stahlbau/public/Fachgebiet_Stahlbau/publikationen/2020_VSU_Pasternak_Ciupack.pdf SN - 1314-071X ER - TY - GEN A1 - Kasper, Yann A1 - Albiez, Matthias A1 - Ummenhofer, Thomas A1 - Mayer, Christoph A1 - Meier, Tobias A1 - Choffat, Fabien A1 - Ciupack, Yvonne A1 - Pasternak, Hartmut T1 - Application of toughened epoxy-adhesives for strengthening of fatigue-damaged steel structures T2 - Construction and Building Materials Y1 - 2021 U6 - https://doi.org/10.1016/j.conbuildmat.2020.121579 SN - 0950-0618 VL - 275 ER - TY - GEN A1 - Li, Zheng A1 - Pasternak, Hartmut T1 - Statistischer Maßstabseffekt und seine Bedeutung für die Zuverlässigkeit im Stahlbau,Teil 1 – Modell und Versuch T2 - Bautechnik Y1 - 2020 U6 - https://doi.org/10.1002/bate.202000030 VL - 97 IS - 11 SP - 766 EP - 772 ER - TY - GEN A1 - Li, Zheng A1 - Loebjinski, Maria A1 - Pasternak, Hartmut T1 - Statistischer Maßstabseffekt und seine Bedeutung für die Zuverlässigkeit im Stahlbau, Teil 2‐ Zuverlässigkeitsanalyse T2 - Bautechnik Y1 - 2020 U6 - https://doi.org/10.1002/bate.202000031 VL - 97 IS - 11 SP - 773 EP - 779 ER - TY - GEN A1 - Li, Zheng A1 - Pasternak, Hartmut A1 - Robra, Jörgen T1 - Tragverhalten von Wellstegträgern mit kreisförmigem Öffnungskranz T2 - Bauingenieur Y1 - 2021 U6 - https://doi.org/10.37544/0005-6650-2021-04-50 SN - 0005-6650 VL - 96 IS - 4 SP - 114 EP - 120 ER - TY - BOOK A1 - Pasternak, Hartmut A1 - Stapelfeld, Christoph A1 - Launert, Benjamin A1 - Michailov, Vesselin A1 - Doynov, Nikolay T1 - Ermittlung der Tragfähigkeit neuartiger stählerner Schalenbauwerke unter realitätsnaher Berücksichtigung des Schweißverzugs Y1 - 2020 SN - 978-3-946885-89-4 PB - Forschungsvereinigung Stahlanwendung e. V. CY - Düsseldorf ER - TY - GEN A1 - Sternsdorff, Florian A1 - Ciupack, Yvonne A1 - Pasternak, Hartmut T1 - Experimental Investigations on Innovative Crack Repair Methods and reinforcing Steel Structures with Adhesivly Bonded CFRP - Lamellas T2 - Engineering Structures and Technologies Y1 - 2021 U6 - https://doi.org/10.3846/est.2021.15036 SN - 2029-882X SN - 2029-8838 VL - 13 IS - 1 SP - 1 EP - 6 ER - TY - GEN A1 - Wang, Jian A1 - Li, Zheng A1 - Robra, Jörgen A1 - Pasternak, Hartmut A1 - Euler, Mathias T1 - Investigation on Shear Buckling of Corrugated Web Beams with Reinforced Web Openings T2 - ce/papers N2 - Corrugated web beams are welded I‐sections with thin‐walled sinusoidal corrugated webs and flanges made of wide flat steel that have been developed as an alternative to steel girders with flat webs. In comparison with hot‐rolled or welded I‐beams with flat webs, corrugated web beams are connected with considerable material savings and fully automated production. Assuming the same load‐bearing capacity, corrugated web beams are lighter than those with a flat web, since the corrugated web beams can often be loaded up to their plastic resistance without reinforcement of the web. The research on the load‐bearing behavior of corrugated web beams without web openings is relatively mature. However, the resistance of corrugated web beams with reinforced web openings, as they are often used in buildings for installations, has not well experimentally been investigated, yet. This paper deals with the shear resistance of corrugated web beams with reinforced square web openings. Three specimens of different geometry with two square web openings were tested. The experiments are compared with a Finite Element Analysis by Abaqus® and with an analytical model allowing simplified calculation. Both models can relatively accurately calculate the shear resistance. The experimental and numerical results show that the increase of the shear resistance of perforated corrugated web beams depends on the wall‐thickness and the steel grade of the web opening reinforcement. KW - Corrugated web beams KW - square web openings KW - ring stiffener KW - local shear buckling KW - experimental investigation KW - finite element analysis Y1 - 2022 U6 - https://doi.org/10.1002/cepa.1800 SN - 2509-7075 VL - 5 IS - 4 SP - 628 EP - 634 ER - TY - GEN A1 - Li, Zheng A1 - Zhang, Qiulei A1 - Shi, Fei A1 - Wang, Jian A1 - Pasternak, Hartmut T1 - Geometric Properties of Steel Components with Stability and Fatigue Risks Using 3D-Laser-Scanning T2 - Buildings N2 - Nowadays, 3D laser scanning technology is extensively employed in laboratory investigations of steel structural components, providing accurate geometric dimensions to reduce uncertainties caused by indeterminate geometry in experimental results. It is often used in conjunction with the Finite Element (FE) Method and analytical solutions, which are more accurate deterministic operators in the research on steel structures. However, establishing a common methodological framework for transferring or mapping 3D-scanned information into finite element models for complex steel structures with stability and fatigue risks remains an ongoing task. In light of this, this study has developed a 3D scanning platform capable of obtaining accurate geometric dimensions for various types of steel components. Different coordinate systems and point cloud mapping algorithms have been established for different types of components to construct actual finite element models with initial imperfections. The feasibility of the self-developed 3D scanning platform and finite element modelling has been validated through three experimental cases: weld details, steel girders, and cylindrical shells. The research findings demonstrate that the captured point cloud can be automatically processed and corrected using the developed algorithm. The scanned data can then be input into the numerical model using various mapping algorithms tailored to the specific geometric properties of the specimens. The differences between the experimental test results and the simulated results obtained from the 3D-scanned finite element models remain within a small range. The self-developed 3D scanning platform and finite element modelling technique effectively capture the actual dimensions of different steel components, enabling the prediction of their stability and fatigue risks through numerical simulations. KW - 3D laser scanning KW - steel structures KW - geometric properties KW - stability KW - fatigue Y1 - 2024 U6 - https://doi.org/10.3390/buildings14010168 SN - 2075-5309 VL - 14 IS - 1 ER - TY - GEN A1 - Wang, Jian A1 - Euler, Mathias A1 - Pasternak, Hartmut A1 - Li, Zheng A1 - Krausche, Thomas A1 - Launert, Benjamin T1 - Bending capacity of single and double-sided welded I-section girders: Part 1: Experimental investigations T2 - Current Perspectives and New Directions in Mechanics, Modelling and Design of Structural Systems : Proceedings of The Eighth International Conference on Structural Engineering, Mechanics and Computation, 5-7 September 2022, Cape Town, South Africa N2 - The lateral-torsional buckling resistance of welded steel girders is affected by their residual stresses and geo-metric imperfections. Generally, both influences are mainly controlled by the manufacturing process, in partic-ular the welding of the girder. This paper presents experimental investigations on four laterally unbraced welded steel girders with thin-walled I-sections, whose flange-to-web junctions are welded from one or two sides to evaluate the fabrication influence. The investigations include lateral-torsional buckling tests under combined bending and torsion loading caused by three-point bending due to an eccentric vertical single force. The geometric imperfections of the welded test girders are determined by 3D laser scanning. The test results show that the influence of the geometric imperfections and the residual stresses on the lateral-torsional buck-ling resistance is limited for the tested girders. KW - Experimental investigations KW - single and double-sided welds KW - imperfections KW - lateral-torsional buckling KW - 3D laser scanning Y1 - 2022 SN - 978-1-00-334845-0 U6 - https://doi.org/10.1201/9781003348443-159 SP - 975 EP - 980 PB - CRC Press CY - Boca Raton ER - TY - GEN A1 - Li, Zheng A1 - Xu, Siying A1 - Geißler, Karsten A1 - Wang, Jian A1 - Pasternak, Hartmut T1 - Developed numerical Analysis of Residual Stress caused by Welding and Cutting in Steel Structures T2 - ce/papers N2 - The welding and flame‐cutting process in the steel construction are commonly used, especially for the bridge structure. Some experiments about welding and cutting have been done separately by some researchers. The results from the experiments were also compared with the results from the numerical simulation under 3D or 2D models. The agreements between those results are as good as they predicted. Therefore, the numerical simulation is a better way to analyze the quality of the steel construction after welding and cutting without time‐consuming and a large amount of cost. But there are only a few research about the numerical simulation and the some of them are aimed to verify the experiments. In this study, the calculation about the residual stresses after welding and thermo‐cutting are considered from 3D‐model into 2D‐Model. The heat source model is simply regarded as curves of time and welding energy with the algorithm methods. And no matter the change of the parameters of the model and the heat source, the heat transfer and the residual stresses can be calculated with the 2D models as fast as possible. By the means of the finite element software Abaqus, the I‐profiles are easy to receive the job results with the input parameters. The influence of the welding and cutting process are visual and direct. KW - Welding KW - Flame cutting KW - Numerical simulation KW - Residual stress KW - Steel structures Y1 - 2023 U6 - https://doi.org/10.1002/cepa.2601 SN - 2509-7075 VL - 6 IS - 3-4 SP - 1507 EP - 1512 ER - TY - GEN A1 - Wang, Jian A1 - Li, Zheng A1 - Pasternak, Hartmut A1 - Euler, Mathias T1 - Shear Buckling Behavior of Tapered Steel Plate Girders with Sinusoidally Corrugated Webs T2 - ce/papers KW - Plate girders KW - Shear Buckling KW - Tapered plate girders KW - Sinusoidal Corrugated Webs KW - Résal effect Y1 - 2023 U6 - https://doi.org/10.1002/cepa.2534 SN - 2509-7075 VL - 6 IS - 3-4 SP - 1787 EP - 1792 ER - TY - GEN A1 - Wang, Jian A1 - Li, Zheng A1 - Pasternak, Hartmut A1 - Euler, Mathias T1 - Querkrafttragfähigkeit von Wellstegträgern mit versteiften quadratischen Stegöffnungen T2 - Bauingenieur N2 - Die Ergebnisse aus drei Traglastversuchen und einer umfangreichen numerischen Parameterstudie (FE-Berechnungen) zum Tragverhalten von Wellstegträgern mit quadratischen Stegöffnungen werden vorgestellt. Es werden versteifte Stegöffnungen mit einem umlaufenden Versteifungskranz betrachtet. In der Parameterstudie werden die Einflüsse der Stegöffnungsgeometrie, der Trägergeometrie und der Position der Stegöffnung auf die Querkrafttragfähigkeit der Wellstegträger untersucht. KW - Wellstegträger KW - Stegöffnung KW - Versteifungskranz Y1 - 2023 U6 - https://doi.org/10.37544/0005-6650-2023-11-31 SN - 0005-6650 VL - 98 IS - 11 SP - 343 EP - 353 ER -