TY - CHAP A1 - Pasternak, Hartmut T1 - Die Cargolifter-Halle in Brand T2 - 23. Stahlbauseminar 2001, am 16./17. 2. 01 in Neu-Ulm und am 23./14 2. 01 in Wien Y1 - 2001 PB - Bauakademie CY - Biberach ER - TY - CHAP A1 - Pasternak, Hartmut A1 - Komann, Steffen T1 - About the role of longitudinal stiffeners in silos T2 - Xth International Scientific - Technical Conference "Metal Structures" - Gdansk 2001 Y1 - 2001 UR - https://www-docs.b-tu.de/fg-stahlbau/public/Fachgebiet_Stahlbau/publikationen/2001_silosteif.pdf ER - TY - CHAP A1 - Pasternak, Hartmut A1 - Schilling, S. A1 - Komann, Steffen T1 - The steel construction of the new CargoLifter Airship Hangar T2 - Proceedings of the International Conference on Structural Engineering, Mechanics and Computation, 2 - 4 April 2001, vol. 1 Y1 - 2001 SN - 0-08-043948-9 SP - 173 EP - 182 PB - Elsevier CY - Amsterdam [u.a.] ER - TY - CHAP A1 - Piekarczyk, Marek A1 - Pieciorak, E. A1 - Pasternak, Hartmut A1 - Kubieniec, Gabriel T1 - Experimental research and integrated modelling with shell finite elements for sheet roof covering T2 - Shell Structure: Theory and Applications - SSTA 2009 Y1 - 2010 SN - 978-0-415-54883-0 SP - 319 EP - 322 PB - Taylor & Francis ER - TY - BOOK A1 - Pasternak, Hartmut A1 - Hoch, Hans-Ullrich A1 - Füg, Dieter T1 - Stahltragwerke im Industriebau Y1 - 2010 SN - 978-3-433-01849-1 PB - Ernst & Sohn CY - Berlin ER - TY - BOOK A1 - Pasternak, Hartmut A1 - Marosi, A. T1 - Tragverhalten von Hallen mit Flanschstreben KW - Hallenbau Y1 - 2008 SN - 978-3-8167-7949-0 PB - Frauenhofer IRB Verlag CY - Stuttgart ER - TY - GEN A1 - Meinz, Jörg A1 - Pasternak, Hartmut T1 - Zum vereinfachten rechnerischen Nachweis von Klebverbindungen im Stahlbau T2 - Bauingenieur KW - Stahlbau Y1 - 2011 SN - 0005-6650 VL - 86 IS - 6 SP - 262 EP - 268 ER - TY - GEN A1 - Pasternak, Hartmut A1 - Robra, Jörgen T1 - Eurocode - Bemessung und Konstruktion von Stahlbauten T2 - Bauingenieur KW - Stahlbau Y1 - 2011 SN - 0005-6650 VL - 86 IS - 7/8 SP - 336 EP - 347 ER - TY - GEN A1 - Pasternak, Hartmut A1 - Robra, Jörgen A1 - Bachmann, Volkmar T1 - Wellstegträger mit größeren Stegblechdicken - Fertigungstechnologie und Tragverhalten T2 - Bauingenieur Y1 - 2009 SN - 0005-6650 VL - 84 IS - 10 SP - 415 EP - 419 ER - TY - GEN A1 - Pasternak, Hartmut A1 - Bartholomé, Susanne Elisabeth T1 - Versuche zu Stahlträgern mit strukturiertem Steg T2 - Bauingenieur Y1 - 2012 SN - 0005-6650 VL - 87 IS - 10 SP - 417 EP - 422 ER - TY - GEN A1 - Pasternak, Hartmut A1 - Müller, Lars T1 - Thermovision - Entwicklung eines neuen Verfahrens zur Dehnungsanalyse beanspruchter Stahlbauteile T2 - Stahlbau Y1 - 2002 SN - 0038-9145 VL - 71 IS - 7 SP - 523 EP - 536 ER - TY - GEN A1 - Pasternak, Hartmut A1 - Schwarzlos, Anja T1 - Zur Interaktion zwischen Biegemoment und Normalkraft bei nachgiebigen Verbindungen T2 - Bauingenieur Y1 - 2002 SN - 0005-6650 VL - 77 IS - 5 SP - 199 EP - 207 ER - TY - GEN A1 - Pasternak, Hartmut A1 - Müller, Lars T1 - Untersuchung des thermoplastischen Verhaltens verschiedener Baustoffe mit Hilfe der Thermovision T2 - Bauingenieur Y1 - 2003 SN - 0005-6650 VL - 78 IS - 5 SP - 221 EP - 230 ER - TY - GEN A1 - Pasternak, Hartmut A1 - Komann, Steffen T1 - Diskret gelagerte, axialbelastete und über den Auflagern längsversteifte Kreiszylinderschalen T2 - Bauingenieur Y1 - 2004 SN - 0005-6650 VL - 79 IS - 10 SP - 443 EP - 446 ER - TY - RPRT A1 - Pasternak, Hartmut A1 - Dilger, Klaus T1 - Einsatz der Schweißsimulation zur systematischen Entwicklung verbesserter Modelle für die Berechnung der Tragfähigkeit komplexer Stahlleichtbaustrukturen Y1 - 2013 SN - 978-3-942541-31-2 N1 - Förderkennzeichen AIF 287 ZBG PB - Verlag und Vertriebsgesellschaft mbH CY - Düsseldorf ER - TY - GEN A1 - Ciupack, Yvonne A1 - Pasternak, Hartmut T1 - Kleben, eine innovative Fügetechnik im Stahlbau : Eurocode-basiertes Bemessungskonzept für Stahlklebverbindungen T2 - BTU News : Zeitung der Brandenburgischen Technischen Universität Cottbus Y1 - 2010 VL - 7 IS - 32 SP - S. 35 ER - TY - GEN A1 - Pasternak, Hartmut A1 - Meinz, Jörg T1 - Versuche zu geklebten Verstärkungen im Stahlhochbau T2 - Bauingenieur Y1 - 2006 SN - 0005-6650 VL - 81 IS - 5 SP - 212 EP - 217 ER - TY - GEN A1 - Rudorf-Witrin, Wolfgang A1 - Stimpfle, Bernd A1 - Blümel, S. A1 - Pasternak, Hartmut T1 - Von der CargoLifter-Werfthalle zu Tropical Islands - Konstruktion, Herstellung und Montage der neuen ETFE-Folienkissen-Eindeckung T2 - Bauingenieur Y1 - 2006 SN - 0005-6650 VL - 81 IS - 1 SP - 33 EP - 42 ER - TY - GEN A1 - Pasternak, Hartmut A1 - Robra, Jörgen T1 - Eurocode 3 - Bemessung und Konstruktion von Stahlbauten T2 - Bauingenieur Y1 - 2011 SN - 0005-6650 VL - 86 IS - 7/8 SP - 336 EP - 347 ER - TY - CHAP A1 - Pasternak, Hartmut A1 - Kubieniec, Gabriel A1 - Piekarczyk, Marek T1 - Adhesives in strengthening of steel structures T2 - Protection of historical buildings, PROHITECH 09, proceedings of the International Conference on Protection of Historical Buildings, Rome, Italy, 21 - 24 June 2009, vol. 1 Y1 - 2009 SN - 978-0-415-55803-7 SN - 978-0-415-55804-4 SP - 551 EP - 556 PB - Taylor & Francis Group CY - London [u.a.] ER - TY - GEN A1 - Böhme, Wilfried A1 - Pasternak, Hartmut A1 - Csesznák, Andras T1 - Sanierung einer Schwimmhalle in Potsdam T2 - Bauingenieur Y1 - 2009 SN - 0005-6650 VL - 84 IS - 3 SP - 95 EP - 100 ER - TY - GEN A1 - Pasternak, Hartmut A1 - Kubieniec, Gabriel T1 - Plate girders with corrugated webs T2 - Journal of Civil Engineering and Management Y1 - 2010 SN - 0733-9364 VL - 16 IS - 2 SP - 166 EP - 171 ER - TY - GEN A1 - Pasternak, Hartmut A1 - Bachmann, Volkmar A1 - Kubieniec, Gabriel T1 - Leichte Fachwerkträger - Fertigungstechnologie und Tragverhalten T2 - Bauingenieur Y1 - 2010 SN - 0005-6650 VL - 85 IS - 10 SP - 412 EP - 420 ER - TY - GEN A1 - Ciupack, Yvonne A1 - Pasternak, Hartmut T1 - Thermisch getrennte Stirnplattenstöße T2 - Bauingenieur Y1 - 2013 SN - 0005-6650 VL - 88 IS - 12 SP - 532 EP - 525 ER - TY - GEN A1 - Pasternak, Hartmut A1 - Ciupack, Yvonne T1 - Development of Eurocode-based design rules for adhesive bonded joints T2 - International Journal of Adhesion and Adhesives Y1 - 2014 U6 - https://doi.org/10.1016/j.ijadhadh.2014.01.011 SN - 1879-0127 VL - 53 SP - 97 EP - 106 ER - TY - GEN A1 - Pasternak, Hartmut A1 - Ciupack, Yvonne T1 - Kalibrierung von Bemessungskonzepten gemäß Eurocode am Beispiel von Klebverbindungen T2 - Bauingenieur Y1 - 2012 SN - 0005-6650 VL - 87 IS - 3 SP - 116 EP - 123 ER - TY - GEN A1 - Pasternak, Hartmut A1 - Bretschneider, Tino T1 - Inspektion und Unterhaltung von Hochbautragwerken mit hoher Schadensfolge - Praxisbericht Tropical Islands T2 - Bauingenieur Y1 - 2007 SN - 0005-6650 VL - 82 IS - 12 SP - 536 EP - 541 ER - TY - GEN A1 - Pasternak, Hartmut A1 - Meinz, Jörg T1 - Kleben im Stahlbau - zwei Beispiele aus dem Fassadenbau T2 - Bauingenieur Y1 - 2007 SN - 0005-6650 VL - 82 IS - 3 SP - 115 EP - 124 ER - TY - GEN A1 - Pasternak, Hartmut A1 - Hannebauer, Dina T1 - Zur Einleitung großer Querkräfte in Wellstegträger T2 - Bauingenieur Y1 - 2004 SN - 0005-6650 VL - 79 IS - 5 SP - 246 EP - 252 ER - TY - CHAP A1 - Pasternak, Hartmut A1 - Hannebauer, Dina T1 - Träger mit profilierten Stegen T2 - Stahlbau-Kalender 2004 Y1 - 2004 SN - 3-433-01703-4 SP - 449 EP - 492 PB - Verlag Ernst CY - Berlin ER - TY - GEN A1 - Pasternak, Hartmut A1 - Blümel, Stefan A1 - Stimpfle, Bernd A1 - Rudorf-Witrin, Wolfgang T1 - Von der CargoLifter-Werfthalle zu Tropical Islands - Entwurf T2 - Bauingenieur Y1 - 2005 SN - 0005-6650 VL - 80 SP - 461 EP - 469 ER - TY - CHAP A1 - Pasternak, Hartmut A1 - Schwarzlos, Anja T1 - Kleben von Stahl T2 - Stahlbau-Kalender 2005 Y1 - 2005 SN - 3-433-01721-2 SP - 785 EP - 818 PB - Verlag Ernst CY - Berlin ER - TY - GEN A1 - Pasternak, Hartmut A1 - Krausche, Thomas A1 - Launert, Benjamin T1 - Schweißen von Trägern mit dicken Blechen, Teil 2: Schweißen unter Baustellenbedingungen – Montagestoß und Variation der Umgebungstemperatur T2 - Bauingenieur KW - Stahlbau, Stabilität, Normen Y1 - 2014 UR - www.bauingenieur.de SN - 0005-6650 VL - 89 IS - 12 SP - 537 EP - 547 ER - TY - CHAP A1 - Pasternak, Hartmut A1 - Launert, Benjamin T1 - Erhöhung der Tragfähigkeit geschweißter I-Profile aus hochfestem Baustahl - Verbesserte Ansätze zur Eigenspannungserfassung T2 - 19. DASt-Forschungskolloquium, 27.-28.Oktober 2014, Hannover Y1 - 2014 SN - 978-3-929371-33-8 PB - DASt CY - Düsseldorf ER - TY - GEN A1 - Pasternak, Hartmut A1 - Krausche, Thomas A1 - Launert, Benjamin T1 - Schweißen von Trägern mit dicken Blechen, Teil 1: Trägerfertigung unter Werksbedingungen – Planung, Herstellung und Simulation T2 - Bauingenieur KW - Stahlbau, Stabilität, Normen Y1 - 2014 UR - www.bauingenieur.de SN - 1436-4867 VL - 89 IS - 10 SP - 395 EP - 404 ER - TY - CHAP A1 - Pasternak, Hartmut A1 - Chwastek, Agnieszka T1 - Beitrag zur Entwicklung eines Bemessungskonzeptes für Dauerfestigkeitsberechnungen von Reparaturschweißungen T2 - 19. DASt-Forschungskolloquium in Hannover, 27. - 28. Oktober 2014 Y1 - 2014 SN - 978-3-929371-33-8 SP - 143 EP - 148 PB - Frehner Consulting GmbH Deutschland CY - Düsseldorf [u.a.] ER - TY - GEN A1 - Pasternak, Hartmut A1 - Sahellie, Samer T1 - Epoxy- and acrylic-bonded joints for strengthening lightweight steel girders T2 - Stahlbau Y1 - 2015 SN - 0038-9145 SN - 1437-1049 VL - 84 IS - 8 SP - 577 EP - 583 ER - TY - GEN A1 - Pasternak, Hartmut A1 - Sahellie, Samer T1 - Expectancy of the lifetime of bonded steel joints due to long-term shear loading T2 - Archives of Civil and Mechanical Engineering Y1 - 2015 U6 - https://doi.org/10.1016/j.acme.2015.05.004 SN - 1644-9665 VL - 15 IS - 4 SP - 1061 EP - 1069 ER - TY - GEN A1 - Pasternak, Hartmut A1 - Ciupack, Yvonne A1 - Schiel, Manuel A1 - Ince, Erdeniz T1 - Adhesive bonded joints in steel structures T2 - Steel Construction Y1 - 2014 SN - 1867-0539 VL - 7 IS - 3 SP - 173 EP - 182 ER - TY - CHAP A1 - Pasternak, Hartmut A1 - Sahellie, Samer T1 - Concentration of the normal stresses in the adherends of adhesively-bonded double lap steel joints due to reducing the width of the bonded area T2 - 14th International Scientific Conference VSU 2014, Sofia, 2014, vol. 2 Y1 - 2014 SP - 197 EP - 202 PB - Univ. of Structural Engineering and Architecture CY - Sofia ER - TY - GEN A1 - Schlaich, Mike A1 - Bleicher, Achim A1 - Pasternak, Hartmut T1 - Der Porsche Pavillon in Monocoque-Bauweise T2 - Bauingenieur Y1 - 2014 SN - 1436-4867 SN - 0005-6650 VL - 89 IS - 1 SP - 1 EP - 10 ER - TY - GEN A1 - Pasternak, Hartmut A1 - Krausche, Thomas A1 - Niemann, M. T1 - Umbau eines Schulgebäudes der Heinrich-Nordhoff-Gesamtschule in Wolfsburg T2 - Bauingenieur Y1 - 2014 SN - 1436-4867 SN - 0005-6650 VL - 89 IS - 4 SP - 182 EP - 185 ER - TY - GEN A1 - Feldmann, Markus A1 - Geßler, Achim A1 - Ummenhofer, Thomas A1 - Götz, Frank A1 - Bartholomé, Susanne Elisabeth A1 - Pasternak, Hartmut T1 - Zum Kleben von CFK-Lamellen im Stahlbau T2 - BTU Stahlbau-Symposium 2014, Cottbus, 2014 Y1 - 2014 SP - 83 EP - 90 PB - BTU CY - Cottbus [u.a.] ER - TY - GEN A1 - Pasternak, Hartmut A1 - Chwastek, Agnieszka T1 - Zur Entwicklung eines Bemessungskonzeptes für die Lebensdauer von Reparaturschweißungen. Teil 1 - Stand der Technik und Versuche T2 - Bauingenieur Y1 - 2015 SN - 1436-4867 SN - 0005-6650 VL - 90 IS - 2 SP - 47 EP - 54 ER - TY - GEN A1 - Pasternak, Hartmut A1 - Launert, Benjamin A1 - Krausche, Thomas T1 - Welding of girders with thick plates — Fabrication, measurement and simulation T2 - Journal of Constructional Steel Research N2 - This article presents experimental and numerical results of the fabrication of welded plate girders under workshop conditions. Main concerns are the prediction of imperfections with the aid of simulation tools and/or simplified engineering models. Their impact on the component design is evaluated in a case study. Special focus is put on the effect of residual welding stress. For this, different simplified distributions are compared with results from welding simulation. The findings confirm the thesis that present recommendations on the implementation of weld-induced imperfections must be rated conservative. This suggests that it is necessary to establish new models. Guidance on future problems in this context will be given. KW - Welded plate girders; Welding simulation; Residual welding stress; Load capacity Y1 - 2015 UR - http://www.sciencedirect.com/science/article/pii/S0143974X15300833 U6 - https://doi.org/10.1016/j.jcsr.2015.08.037 SN - 0143-974X VL - Vol. 115 SP - 407 EP - 416 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 -