TY - CHAP A1 - Pasternak, Hartmut A1 - Krausche, Thomas A1 - Launert, Benjamin T1 - Welded construction site joints in bridges T2 - Steel Bridges: Innovation & New Challenges, 8th International Symposium on Steel Bridges, Istanbul, 2015 N2 - In large steel construction, as in steel bridges, construction site welds are made under difficult conditions such as low temperatures and wind. The comprehensive study will show not only test results from the analysis in the climate chamber (large scale test) with low temperatures (-20°C, -10°C) as well as numerical calculations with the help of welding simulation and non-linear structural analysis. Deflections and temperature are given and compared with traditional engineering models and advises for future problems are presented. For bridge girders with I cross sections, welded thick plates are used and there joining need to be considered precisely. Effect from welding, such as deflections and residual stresses, will have an outcome on the performed component. For welding of thick plates multi-layer welding is used. The edges need to be cut before welding. The preparation process needs to be considered as well as actual joining to have an economic performance. As joint geometry the Z-joint was chosen and investigated. Results from testing as well as from the welding simulation will be shown and compared. Thereby an engineering model will be consulted to evaluate the results. To evaluate the impact of the welding process a FEM load capacity calculation was performed and will be compared with test without imperfections from the joining process. KW - Welded Joints, Welding Simulation, Engineering Models, Load Capacity Calculation Y1 - 2015 SN - 978-605-65900-2-3 SP - 315 EP - 320 PB - Turkish Constructional Steelwork Association (TUCSA) CY - Istanbul, Turkey ER - TY - BOOK A1 - Nitschke-Pagel, Thomas A1 - Klassen, Jakob A1 - Pasternak, Hartmut A1 - Launert, Benjamin A1 - Krausche, Thomas T1 - P 858 - Schweißen dicker Bleche unter Baustellenbedingungen – Beurteilung des Einflusses auf das Tragverhalten von Montagestößen N2 - Beim Aufbau großer Stahlstrukturen im Brücken- oder Stahlhochbau wird heute vermehrt auf modulare Fabrikfertigung gesetzt. Ein Fügen dieser Module auf der Baustelle zu einer Gesamtstruktur ist aber weiterhin notwendig. Als Fügeverfahren wird hier häufig das MAG-Mehrlagenschweißen eingesetzt. Gerade an dicken Blechen stellen Baustellenschweißungen nicht nur besondere Anforderungen an den ausführenden Betrieb, die Bauleitung und Bauüberwachung, sondern auch an den Konstrukteur. Wichtig für den Konstrukteur ist die Kenntnis der sich durch Schweißungen einstellenden Schrumpfung der Bauteile, der auftretenden Verzüge und Eigenspannungen. Gerade bei Baustellenschweißungen müssen diese Aspekte in der Konstruktionsphase der Einzelkomponenten mit berücksichtigt werden, um die erforderlichen Toleranzen bei der Montage einzuhalten. Eine genaue Kenntnis der durch Schweißungen verursachten Phänomene ist in den Konstruktions- und Montagebetrieben oft nur aus mehrjährigen Erfahrungen vorhanden. Ein grundlegendes, vollständiges Bild der Abläufe beim Schweißen auf der Baustelle, das es ermöglicht, dieses Wissen auf neue Konstruktionen zu übertragen, fehlt bisher. Insbesondere für die immer öfter im Brücken- und Stahlhochbau eingesetzten höherfesten Feinkornbaustähle (z.B. S460) ist die Kenntnis des Verhaltens bei Baustellenschweißungen notwendig. Hier setzt der Forschungsantrag an. Mit Hilfe der Schweißsimulation können die Auswirkungen von Schweißnähten, wie die Entstehung von Verzügen und Eigenspannungen am Bauteil, global dargestellt werden. Eine anschließende Struktursimulationen (Festigkeits- und Steifigkeitsberechnungen) mit aus der Schweißsimulation integrierten Ergebnissen bildet die Basis für ergänzende Untersuchungen. Montagestöße sind außerdem durch Verschmutzung und Witterung negativ beeinflusst. Die Montage kann beispielsweise bei niedrigen Temperaturen unterhalb des Gefrierpunkts durchgeführt werden müssen. Diese Situation wurde in einer Klimakammer simuliert und die Auswirkungen der Umgebungstemperatur bei der Montage auf das Tragverhalten der Verbindung untersucht. Für die im Rahmen des Vorhabens untersuchten Fälle ist kein Einfluss variierender Umgebungstemperaturen bis -10 °C auf die resultierenden Schweißeigenspannungen festzustellen. Der Vergleich von Verzug und Eigenspannung gegenüber normativ vorgegeben Toleranzwerten sowie vereinfachten Ingenieurmodellen für die Approximation des Eigenspannungsverlaufs zeigt große Defizite. Bei realitätsnaher Implementierung der Eigenspannungen in die Traglastberechnung können z.T. große Reserven im Rahmen der nichtlinearen Traglastberechnung ausgenutzt werden. KW - Bauteilversuche, Stahlbau, Stabilität, Normen Y1 - 2015 UR - https://www.stahldaten.de/de/shop/fosta-berichte/werkstoffverhalten/p-858/ SN - 978-3-942541-69-5 PB - Verlag und Vertriebsgesellschaft mbH CY - Düsseldorf ER - TY - GEN A1 - Pasternak, Hartmut A1 - Krausche, Thomas T1 - The Porsche Pavilion in the Autostadt Wolfsburg, Germany T2 - Procedia Engineering KW - monocoque KW - stainless steel KW - innovative building design KW - construction welding KW - light steel construction Y1 - 2013 U6 - https://doi.org/10.1016/j.proeng.2013.04.010 SN - 1877-7058 IS - 57 SP - 63 EP - 69 ER - TY - GEN A1 - Bartholomé, Susanne Elisabeth A1 - Pasternak, Hartmut A1 - Feldmann, Markus A1 - Geßler, Achim A1 - Ummenhofer, Thomas A1 - Götz, Frank T1 - Verstärkung von Stahlkonstruktionen durch geklebte CFK-Lamellen T2 - 20. DASt-Forschungskolloquium in Essen, 08./09. März 2016 Y1 - 2016 SN - 978-3-941687-19-6 SP - 89 EP - 94 PB - Frehner Consulting CY - Füssen ER - TY - CHAP A1 - Bartholomé, Susanne Elisabeth A1 - Pasternak, Hartmut A1 - Feldmann, Markus A1 - Geßler, Achim A1 - Ummenhofer, Thomas A1 - Götz, Frank T1 - Kleben von CFK-Lamellen im Stahlbau T2 - DVS Congress 2015, Große Schweißtechnische Tagung, Nürnberg Y1 - 2015 SN - 978-3-945023-46-4 SP - 927 EP - 932 PB - DVS Media CY - Düsseldorf ER - TY - CHAP A1 - Bartholomé, Susanne Elisabeth A1 - Pasternak, Hartmut A1 - Feldmann, Markus A1 - Geßler, Achim A1 - Ummenhofer, Thomas T1 - Systematische Untersuchung zur Verstärkung von Stahlkonstruktionen mit kohlefaserverstärkten Kunststoffen (CFK) T2 - Tagungsband, 16. Kolloquium Gemeinsame Forschung in der Klebtechnik, Köln, März 2016 Y1 - 2016 SP - 45 EP - 47 PB - DECHEMA, Gesellschaft für Chemische Technik und Biotechnologie e.V. CY - Frankfurt am Main ER - TY - CHAP A1 - Bartholomé, Susanne Elisabeth A1 - Pasternak, Hartmut A1 - Bulkowski, Marcin T1 - Risssanierung von dynamisch beanspruchten Stahlbauteilen mit kohlenfaserverstärkten Kunststoffen (CFK-Lamellen) T2 - DVS Congress 2015, Große Schweißtechnische Tagung, Nürnberg Y1 - 2015 SN - 978-3-945023-46-4 SP - 597 EP - 602 PB - DVS Media CY - Düsseldorf ER - TY - GEN A1 - Pasternak, Hartmut A1 - Kubieniec, Gabriel T1 - Implementation of longitudinal welding stresses into structural calculation of steel structures T2 - JOURNAL OF CIVIL ENGINEERING AND MANAGEMENT Y1 - 2016 U6 - https://doi.org/10.3846/13923730.2014.994029 SN - 1392-3730 SN - 1822-3605 VL - 22 IS - 1 SP - 47 EP - 55 ER - TY - GEN A1 - Pasternak, Hartmut A1 - Sahellie, Samer T1 - Conversion factors of the temperature effect on the shear strength of adhesively bonded steel joints T2 - Journal of civil engineering and management Y1 - 2016 U6 - https://doi.org/10.3846/13923730.2015.1068848 SN - 1392-3730 VL - 22 IS - 5 SP - 666 EP - 672 ER - TY - CHAP A1 - Launert, Benjamin A1 - Rhode, Michael A1 - Pasternak, Hartmut A1 - Kannengießer, Thomas ED - Dubina, Dan ED - Ungureanu, Viorel T1 - Welding residual stresses in high-strength steel. Experimental results T2 - The International Colloquium on Stability and Ductility of Steel Structures N2 - This article presents the latest results of an ongoing national research project on improved models for the prediction of welding residual stresses of thick-plated welded I-girders. The experimental program is presented and the importance of different influencing factors on the residual stresses is discussed in detail. All results are compared for mild (S355J2+N) and high strength (S690QL) steel. Finally, conclusions for further works are drawn. KW - Residual stresses, High-strength steel, Welded sections, Measurement Y1 - 2016 SN - 978-92-9147-133-1 SP - 517 EP - 524 PB - Ernst & Sohn ET - 2016 edition ER - TY - CHAP A1 - Ciupack, Yvonne A1 - Pasternak, Hartmut A1 - Ledecky, Lukas A1 - Mette, Christoph A1 - Stammen, Elisabeth A1 - Dilger, Klaus ED - Virdi, Kuldeep ED - Tenhunen, Lauri T1 - Adhesive bonded steel structures under cyclic loading T2 - Proceedings of the METNET Seminar 2015 in Budapest, 2015 Y1 - 2015 SN - 978-951-784-762-9 SN - 978-951-784-763-6 SP - 90 EP - 101 PB - HAMK University of Applied Sciences CY - Hämeenlinna ER - TY - CHAP A1 - Stojković, Nenad A1 - Ledecky, Lukas A1 - Ciupack, Yvonne A1 - Pasternak, Hartmut A1 - Mette, Christoph A1 - Stammen, Elisabeth A1 - Dilger, Klaus T1 - Tensile strength of adhesively bonded façade joints T2 - The Sixth International Conference Civil Engineering - Science & Practice, Montenegro, 2016 Y1 - 2016 SN - 978-86-82707-30-1 SP - 273 EP - 280 ER - TY - CHAP A1 - Jäger, A. A1 - Pasternak, Hartmut T1 - Grundlegende Studien zum Beulverhalten von engringversteiften Kreiszylinderschalen unter Axialdruck T2 - Offen im Denken, 20. DASt-Forschungskolloquium in Essen, 08./09. März 2016 Y1 - 2016 SN - 978-3-941687-19-6 SP - 38 EP - 42 PB - Deutscher Ausschuß für Stahlbau DASt CY - Düsseldorf ER - TY - CHAP A1 - Ledecky, Lukas A1 - Stojković, Nenad A1 - Ciupack, Yvonne A1 - Pasternak, Hartmut A1 - Mette, Christoph A1 - Fischer, Vitali A1 - Stammen, Elisabeth A1 - Dilger, Klaus T1 - Service loading and fatigue behavior of adhesively bonded steel-steel façade joints T2 - 16th International Scientific Conference VSU 2016, Sofia, 2016, vol. 1 Y1 - 2016 SP - 187 EP - 192 PB - VSU CY - Sofia ER - TY - CHAP A1 - Pasternak, Hartmut A1 - Launert, Benjamin A1 - Kannengießer, Thomas A1 - Rhode, Michael ED - Zingoni, Alphose T1 - Residual stresses and imperfections in welded high-strength I-shape members T2 - Insights and Innovations in Structural Engineering, Mechanics and Computation, Proceedings of the Sixth International Conference on Structural Engineering, Mechanics and Computation, Cape Town, South Africa, 5-7 September 2016 N2 - This article addresses the imperfections caused by the weld assembly in I-shape sections made of two structural steel grades. Load influencing imperfections are assumed as deviations from the ideal shape (e.g. bending distortion) and longitudinal residual stresses. The quality of a numerically aided design of components exposed to either compression and/or bending is significantly affected, depending on these parameters [1]. The Eurocode provides robust simplified models. As a result, the Ultimate Limit State (ULS) is approached on a conservative basis. The following investigations are aimed at providing further guidance on these values in component-like specimens. The long term goal is an improved understanding of the load-bearing capacity of such sections. As a first step in this process, the experimental and corresponding numerical studies are presented. Y1 - 2016 UR - https://www.crcpress.com/Insights-and-Innovations-in-Structural-Engineering-Mechanics-and-Computation/Zingoni/p/book/9781138029279 SN - 978-1-138-02927-9 SP - 403 EP - 404 PB - Taylor & Francis CY - London ER - TY - CHAP A1 - Pasternak, Hartmut A1 - Krausche, Thomas T1 - Details of the steel assembly of a membrane-cladded double ­ curved cable net roof T2 - ICCAEE 2016 Kuala Lumpur/Malaysia, 2nd International Congress on Technology - Engineering & Science Y1 - 2016 PB - University of Malaysia CY - Pahang ER - TY - GEN A1 - Bartholomé, Susanne Elisabeth A1 - Pasternak, Hartmut A1 - Feldmann, Markus A1 - Geßler, Achim A1 - Ummenhofer, Thomas A1 - Ruff, Daniel T1 - Alternative Verstärkungsmaßnahme im Stahlbau mit aufgeklebten unidirektionalen CFK-Lamellen T2 - Schweißen und Schneiden Y1 - 2016 SN - 0036-7184 VL - 68 IS - 8 SP - 490 EP - 499 ER - TY - GEN A1 - Jäger, Andreas A1 - Pasternak, Hartmut T1 - Studien zum Beulverhalten von eng ringversteiften Kreiszylinderschalen unter Axialdruck T2 - Bauingenieur Y1 - 2016 SN - 0005-6650 VL - 91 IS - 10 SP - 401 EP - 409 ER - TY - GEN A1 - Bartholomé, Susanne Elisabeth A1 - Pasternak, Hartmut A1 - Feldmann, Markus A1 - Geßler, Achim A1 - Ummenhofer, Thomas A1 - Ruff, Daniel T1 - Geklebte CFK-Lamellen verstärken Stahlbauteile T2 - Adhäsion KW - Stahlbau KW - Verstärkung KW - CFK-Lamelle Y1 - 2016 UR - http://link.springer.com/article/10.1007/s35145-016-0039-6 SN - 1619-1919 SN - 2192-8681 VL - 60 IS - 9 SP - 42 EP - 49 ER - TY - GEN A1 - Bartholomé, Susanne Elisabeth A1 - Pasternak, Hartmut T1 - Träger mit schlanken, wabenförmig strukturierten Stegen - Versuch und Simulation T2 - Stahlbau Y1 - 2016 U6 - https://doi.org/10.1002/stab.201610423 SN - 1437-1049 SN - 0038-9145 VL - 85 IS - 11 SP - 724 EP - 732 ER - TY - CHAP A1 - Launert, Benjamin A1 - Rhode, Michael A1 - Kromm, Arne A1 - Pasternak, Hartmut A1 - Kannengießer, Thomas ED - Holden, Thomas M. ED - Muránsky, Ondrej ED - Edwards, Lyndon T1 - Residual Stress Influence on the Flexural Buckling of Welded I-Girders T2 - Residual Stresses 2016 – ICRS-10 N2 - The nonlinear analysis became a common tool to precisely assess the load-bearing behavior of steel beam and column members. The failure level is significantly influenced by different types of imperfections, among geometric also structural imperfections (residual stresses). Here are still gaps in the knowledge. Nowadays, 3-D welding simulation developed to a level where it could provide reliable estimation of weld-induced distortion and residual stresses. Nevertheless, modelling and computational effort are still in a less practicable range. In this study a simplified procedure to implement residual welding stresses in continuous large scale members is proposed and the influence on the ultimate limit state of slender members in compression is evaluated for two common structural steel grades. The results showed significant improvements in the utilization of load bearing capacity compared with simplified design methods. The comparatively general approach in this study offers potential for future optimization. KW - Stability Design KW - Finite Element Method KW - 2-D Welding Simulation KW - Inherent Strain KW - PDA Y1 - 2016 UR - http://www.mrforum.com/product/9781945291166/ SN - 978-1-94529116-6 U6 - https://doi.org/10.21741/9781945291173-19 SP - 109 EP - 114 PB - Materials Research Forum LLC CY - Millersville, PA ER - TY - CHAP A1 - Kromm, Arne A1 - Rhode, Michael A1 - Launert, Benjamin A1 - Dixneit, Jonny A1 - Kannengießer, Thomas A1 - Pasternak, Hartmut ED - Holden, Thomas M. ED - Muránsky, Ondrej ED - Edwards, Lyndon T1 - Combining Sectioning Method and X-Ray Diffraction for Evaluation of Residual Stresses in Welded High Strength Steel Components T2 - Residual Stresses 2016 - ICRS-10 N2 - Residual stresses and distortions in welded I-girders for steel construction are relevant when evaluating the stability of steel beams and column members. The application of high strength steels allows smaller wall thicknesses compared to conventional steels. Therefore, the risk of buckling has to be considered carefully. Due to the lack of knowledge concerning the residual stresses present after welding in high strength steel components conservative assumptions of their level and distribution is typically applied. In this study I-girders made of steels showing strengths of 355 MPa and 690 MPa were welded with varying heat input. Due to the dimension of the I-girders and the complex geometry the accessibility for residual stress measurement using X-ray diffraction was limited. Therefore, saw cutting accompanied by strain gauge measurement has been used to produce smaller sections appropriate to apply X-ray diffraction. The stress relaxation measured by strain gauges has been added to residual stresses determined by X-ray diffraction to obtain the original stress level and distribution before sectioning. The combination of both techniques can produce robust residual stress values. From practical point of view afford for strain gauge application can be limited to a number of measuring positions solely to record the global amount of stress relaxation. X-ray diffraction can be applied after sectioning to determine the residual stresses with sufficient spatial resolution. KW - Weld Residual Stress KW - Sectioning Method KW - X-Ray Diffraction Y1 - 2016 UR - http://www.mrforum.com/product/9781945291166/ SN - 978-1-94529116-6 U6 - https://doi.org/10.21741/9781945291173-28 SP - 163 EP - 168 PB - Materials Research Forum LLC CY - Millersville, PA ER - TY - GEN A1 - Launert, Benjamin A1 - Szczerba, Radosław A1 - Gajewski, Marcin A1 - Rhode, Michael A1 - Pasternak, Hartmut A1 - Giżejowski, Marian T1 - The buckling resistance of welded plate girders taking into account the influence of post-welding imperfections – Part 1: Parameter study T2 - Materials Testing N2 - Welding is the most important joining technique and offers the advantage of customizable plate thicknesses. On the other hand, welding causes residual stresses and deformations influencing the load carrying capacity. Their consideration in the design requires simple and fast models. Though welding simulation has contributed to accurately access to these values nowadays, their application to large components remains still in a less practicable range. Nevertheless, many studies emphasized the need to make corrections in recently available simplified models. Especially the influence of residual stresses seems somewhat overestimated in many cases if comparing conventional structural steel S355 and high-strength steel S690. In times of computer-aided design, an improved procedure to implement weld-inducted imperfections appears overdue. This will be presented in two parts. The first part illustrates the potential influence of post-welding imperfections exemplified for weak axis buckling in comparison with the general method in accordance with Eurocode 3. Residual stresses and initial crookedness were varied systematically in order to produce a scatter band of capacities. An approach to characterize the borders of these imperfections was undertaken before that. The excessive scattering of reduction factors for the load bearing capacity demonstrates the importance of these variables. Results were finally evaluated against advanced simulation models which will be further detailed in part two of this contribution. KW - Welded plate girders KW - stability KW - post-welding imperfections KW - residual stresses KW - parameter study Y1 - 2017 UR - http://www.hanser-elibrary.com/doi/abs/10.3139/120.110964 U6 - https://doi.org/10.3139/120.110964 SN - 0025-5300 VL - 59 IS - 1 SP - 47 EP - 56 ER - TY - GEN A1 - Launert, Benjamin A1 - Rhode, Michael A1 - Kromm, Arne A1 - Pasternak, Hartmut A1 - Kannengießer, Thomas T1 - Measurement and numerical modeling of residual stresses in welded HSLA component-like I-girders T2 - Welding in the World N2 - The present contribution shows the residual stress results obtained from experiments with the sectioning method in comparison to global (structural) welding simulation models on component-like (i.e., large scale) I-girders made of structural steel grades S355 and S690QL. Plates were welded by conventional gas metal arc welding using two different heat inputs. In addition, the base material was assumed to be approximately stress-free. Based on these results, conclusions and recommendations for the design of welded I-girders are drawn. KW - Residual Stresses KW - Microalloyed steels KW - Girders KW - MAG welding KW - Simulating Y1 - 2016 UR - http://rdcu.be/n6mU U6 - https://doi.org/10.1007/s40194-016-0413-x SN - 0043-2288 SN - 1878-6669 VL - 61 IS - 2 SP - 223 EP - 229 ER - TY - GEN A1 - Loebjinski, Maria A1 - Rug, Wolfgang A1 - Pasternak, Hartmut T1 - Zuverlässigkeitsbewertung von Holzbauteilen im Bestand T2 - Bauingenieur N2 - Die aktuellen Bemessungsnormen des Eurocodes beinhalten keine gesonderten Regelungen für bestehende Bauwerke. Dennoch sind diese aus verschiedenen Gründen spezifisch zu bemessen. Dazu gehören sowohl öko-nomische Gründe, als auch Anforderungen an die Erhaltung von historischen Konstruktionen. Dieser Beitrag fasst Grundlagen zur Zuverlässigkeitstheorie und zur Ermittlung von Teilsicherheitsbeiwerten zusammen, stellt den aktuellen Stand der Technik zu Normen und Standards der zuverlässigkeitstheoretischen Bemessung und zur Behandlung von Bestandsbauten in der Bemessung dar und zeigt mit vereinfachten Rechnungen das Opti-mierungspotential der Teilsicherheitsbeiwerte für historische Holzkonstruktionen auf. Y1 - 2017 SN - 0005-6650 VL - 92 IS - 2 SP - 65 EP - 73 ER - TY - CHAP A1 - Ciupack, Yvonne A1 - Pasternak, Hartmut ED - Virdi, Kuldeep ED - Tenhunen, Lauri T1 - Bonding Technology in Steel Structures, a Summary of Research Activities at Chair of Steel and Timber Structures T2 - Proceedings of the METNET Seminar 2016 in Castellon Y1 - 2016 SN - 978-951-784-784-1 SP - 19 EP - 30 CY - Hämeenlinna ER - TY - GEN A1 - Pasternak, Hartmut A1 - Launert, Benjamin A1 - Kannengießer, Thomas A1 - Rhode, Michael T1 - Advanced Residual Stress Assessment of Plate Girders Through Welding Simulation T2 - Procedia Engineering N2 - This article provides an impression on potentials in applying nowadays welding simulation tools in construction design. This is carried out exemplary on plate girders from two structural steel grades. The calculated residual stresses are compared with measurements by sectioning method. It has been repeatedly stated that present Eurocode models fail to approximate the residual stresses. Especially for high strength steel (HSS) only limited information is available on realistic occurring residual stresses in typical I-girders. The investigations are aimed to give further guidance on these values. A few proposals on advanced models are discussed. KW - Residual stresses KW - Plate girders KW - I-shape sections KW - High-strength steel KW - Welding simulation KW - Advanced models Y1 - 2017 U6 - https://doi.org/10.1016/j.proeng.2017.02.013 SN - 1877-7058 VL - 172 SP - 23 EP - 30 ER - TY - GEN A1 - Kemper, Frank A1 - Ledecky, Lukas A1 - Feldmann, Markus A1 - Pasternak, Hartmut A1 - Fischer, Vitali T1 - Zeitabhängige Windbeanspruchungen von geklebten Fassadenanschlüssen T2 - Bauingenieur N2 - Für die Bemessung lastabtragender Klebverbindungen im Fassadenbereich ist zu beachten, dass die Windbelastungen auf den Bauwerksoberflächen sowohl zeitlich als auch räumlich veränderlich sind. Während für übliche Fassadenanschlüsse eine Bemessung mit charakteristischen Extremwerten ausreichend ist, muss beim Einsatz von sowohl höhermoduligen (z.B. Acrylat) als auch niedrigmoduligen (z.B. Polyurethan) Klebstoffen, die beide ein zeit- und temperaturabhängiges Materialverhalten aufweisen, eine vollständige Beschreibung dieser zeitbezogenen Lasteinwirkungen erfolgen. Nur dadurch wird letztlich die erforderliche betriebsfeste Auslegung eines geklebten Fassadenanschlusses ermöglicht. Im vorliegenden Beitrag wird die Ermittlung von zeitbezogenen Lasteinwirkungen und die Berechnung der daraus resultierenden Beanspruchungs-Zeit-Funktionen infolge einer natürlichen Windeinwirkungen auf Basis von Windkanalversuchen und Windstatistik thematisiert. Anhand geeigneter Zählverfahren und unter Berücksichtigung von klebstoffspezifischen Materialeigenschaften wird exemplarisch aufgezeigt, inwiefern unterschiedliche Fassadenpositionen und Windeigenschaften für die Auslegung von geklebten Fassadenanschlüssen von Bedeutung sind. Y1 - 2017 UR - http://www.bauingenieur.de/bauing/currentarticle.php?data[article_id]=87197 SN - 1436-4867 SN - 0005-6650 VL - 92 IS - 3 SP - 115 EP - 122 ER - TY - CHAP A1 - Simon, Flaviu A1 - Moradi, Milad A1 - Hildebrand, Jörg A1 - Pasternak, Hartmut ED - Hildebrand, Jörg ED - Loose, Tobias ED - Reich, Michael T1 - The influence of the welding sequence on the load bearing capacity and stress distribution of square hollow section steel joints T2 - Simulationsforum 2016, Schweißen und Wärmebehandlung, Weimar, Tagungsband 08.-10. November 2016 N2 - The aim of this contribution is to investigate the influence of welding sequencing patterns on the load bearing capacity of a S355 steel square hollow section (SHS) T-Joint. The failure and the joint behavior under loading condition are analyzed. The FE-software SYSWELD v2014 is used for the thermo-mechanical simulation of the welding process. The type of welding process used is metal active gas (MAG) welding. A fillet weld with a throat thickness of 5 mm is performed. After the welding simulation, the results in terms of stresses and distortion are validated with the experimental data. Due to the geometrical characteristics of this type of joint, a compressive test is performed. A load is applied on the upper surface the vertical member (brace). The force-displacement behavior is plotted and discussed. The differences and influencing parameters are identified. The model is prepared for the subsequent sensitivity study which will be done in the software OptiSLang, which is developed by Dynardo GmbH. Y1 - 2016 UR - http://www.fws-ev.de/fileadmin/downloads/Tagungsband_Simulationsforum_2016-Schweissen_und_Waermebehandlung_web.pdf SN - 978-3-00-054805-5 SP - 176 EP - 187 PB - Verein zur Förderung der numerischen Analyse der Wärmebehandlungs- und Schweißprozesse e.V. CY - Weimar ER - TY - CHAP A1 - Shlychkova, Darita A1 - Pasternak, Hartmut T1 - Numerical analysis of lightweight structured sandwich beams made of steel T2 - 16th International Scientific Conference VSU 2016, Sofia, 2016, vol. 1 N2 - Using a special technology it is possible to produce thin "honeycomb" structured plates. Such plates have been used e.g. for the roof of the sport complex "Olimp" in Odessa. That roof gives an extraordinary impression. That is why the question: how do structured plates behave as beams with C-section under concentrated force in the middle of the upper flange? In an ongoing project, two of those structured plates were assembled in different ways trough point welding. "Sandwich" beams were modelled and calculated using the nonlinear finite elements. Using Abaqus software load deformation curves for each beam and local stability were analyzed. Those sandwich beams may be used in exhibition stand construction. KW - Lightweight constructions, structured steel plates, sandwich beam, modelling Y1 - 2016 SP - 318 EP - 323 PB - VSU CY - Sofia ER - TY - CHAP A1 - Ledecky, Lukas A1 - Ciupack, Yvonne A1 - Pasternak, Hartmut A1 - Fischer, Vitali A1 - Stammen, Elisabeth A1 - Dilger, Klaus T1 - Untersuchungen zum Tragverhalten und der Lebensdauer von Klebverbindungen im Stahlbau unter zyklischen Belastungen (LebKleb) T2 - 17. Kolloquium Gemeinsame Forschung in der Klebtechnik, Tagungsband, 14. - 15. Februar 2017 Y1 - 2017 SP - 37 EP - 38 PB - DECHEMA CY - Frankfurt am Main ER - TY - CHAP A1 - Ledecky, Lukas A1 - Ciupack, Yvonne A1 - Pasternak, Hartmut A1 - Mette, Christoph A1 - Stammen, Elisabeth A1 - Dilger, Klaus T1 - Untersuchungen zum Tragverhalten und der Lebensdauer von Klebverbindungen im Stahlbau unter zyklischen Belastungen (LebKleb) T2 - 16. Kolloquium Gemeinsame Forschung in der Klebtechnik, Köln, 2016 Y1 - 2016 SP - 39 EP - 41 PB - DECHEMA CY - Frankfurt am Main ER - TY - GEN A1 - Ciupack, Yvonne A1 - Pasternak, Hartmut A1 - Mette, Christoph A1 - Stammen, Elisabeth A1 - Dilger, Klaus T1 - Adhesive bonding in steel construction - Challenge and innovation T2 - Procedia Engineering Y1 - 2017 U6 - https://doi.org/10.1016/j.proeng.2017.02.048 SN - 1877-7058 N1 - Modern Building Materials, Structures and Techniques, MBMST 2016, Vilnius VL - 172 SP - 186 EP - 193 ER - TY - CHAP A1 - Li, Zheng A1 - Pasternak, Hartmut T1 - Development of a stochastic material model at constant stress distribution in steel construction T2 - 16th International Scientific Conference VSU 2016, Sofia, 2016, vol. 1 N2 - This paper briefly presents the results of theoretical and experimental investigations on the size effect in metal. The Chain of Bundle Model, which is based on a stochastic material model by Weibull and log-normal distribution, will be developed and the possibility to approximately determine the parameter ξ of the model is given. The tests were performed on specimens from the same steel with different sizes. According to the experiments, the relationship between the sizes of the specimens and the strength can be analyzed through probability- and reliability theory. The theoretical and experimental results show that if the volume increases hundredfold, the strength will be reduced to 90% ~ 95%. Therefore, the size effect plays an unnegligible role in steel construction. Y1 - 2016 SP - 193 EP - 198 PB - VSU CY - Sofia ER - TY - CHAP A1 - Pasternak, Hartmut A1 - Krausche, Thomas T1 - A special Construction Site: the Guyed Mast at Torfhaus in the Harz Mountains, Germany T2 - Risk and Safety Engineering, 12th International Conference, Kopaonik, 2017 Y1 - 2017 UR - http://www.rizik.vtsns.edu.rs/en/zbornici-radova/ SN - 978-86-6211-107-4 SP - 540 EP - 545 PB - The Higher Education Technical School of Professional Studies CY - Novi Sad ER - TY - GEN A1 - Linke, Gunter A1 - Rug, Wolfgang A1 - Pasternak, Hartmut T1 - Festigkeitssortierung von Bauholz in historischen Gebäuden - Bericht zum Stand der Technik T2 - Bauingenieur Y1 - 2017 VL - 92 IS - 5 SP - 229 EP - 236 ER - TY - GEN A1 - Stojković, Nenad A1 - Folić, Radomir A1 - Pasternak, Hartmut T1 - Mathematical model for the prediction of strength degradation of composites subjected to constant amplitude fatigue T2 - International Journal of Fatigue Y1 - 2017 U6 - https://doi.org/10.1016/j.ijfatigue.2017.06.032 SN - 0142-1123 VL - 103 SP - 478 EP - 487 ER - 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 -