TY - GEN A1 - Ciupack, Yvonne A1 - Pasternak, Hartmut A1 - Geßler, Achim A1 - Feldmann, Markus A1 - Kasper, Yann A1 - Albiez, Matthias A1 - Ummenhofer, Thomas T1 - Repair of Fatigue Cracked CT-specimens Using Adhesively Bonded CFRP Lamellas T2 - 27th Annual International Conference on Composites / Nano Engineering ICCE-27 Y1 - 2019 UR - https://www.b-tu.de/fg-stahlbau/publikationen/veroeffentlichungen ER - TY - GEN A1 - Ciupack, Yvonne A1 - Pasternak, Hartmut T1 - Some Remarks about the New Generation of prEN 1993-1-1 T2 - 27th Annual International Conference on Composites / Nano Engineering ICCE-27 Y1 - 2019 UR - https://www.b-tu.de/fg-stahlbau/publikationen/veroeffentlichungen ER - TY - GEN A1 - Doynov, Nikolay A1 - Stapelfeld, Christoph A1 - Michailov, Vesselin A1 - Pasternak, Hartmut A1 - Launert, Benjamin ED - Sommitsch, Christof ED - Enzinger, Norbert ED - Mayr, Peter T1 - Distortion analysis of large scaled welded structures T2 - Mathematical Modelling of Weld Phenomena 12 : selected peer reviewed papers from the 12th International Seminar Numerical Analysis of Weldability : September 23-26, 2018, Graz, Schloss Seggau - Austria N2 - The work presents an innovative approach for simulation of welding induced distortions, which allows taking into consideration the local effects of the welding process as well as the global interactions in the structure. The approach bases on an integration of analytical and numerical calculation’s procedures in a hybrid model, realized with the aid of the inherent strain concept. The analytical procedure calculates the shrinkage strain components and area of the plastic deformed zone, caused by welding. The calculated strains are then transferred to the global finite element model in order to predict the distortions and stresses in the structure after every welding stage, as well as their final state. The consideration of welding scenarios, weld sequence, clamping conditions and the assembling stages is done by taking into account the intermediate variation of the strain state during the manufacturing steps. The article gives the theoretical basis of the analytical model. The consideration of the essential physical relations is put into discussion. The application of the model is illustrated on complex structures. Its reliability and practicability are demonstrated by means of a validation study. Y1 - 2019 SN - 978-3-85125-615-4 U6 - https://doi.org/10.3217/978-3-85125-615-4 SP - 254 EP - 280 PB - Verlag der Technischen Universität Graz CY - Graz ER - TY - GEN A1 - Pasternak, Hartmut A1 - Krausche, Thomas ED - Zingoni, Alphose T1 - Details and assembly of two cladded double curved cable net roofs T2 - Advances in engineering materials, structures and systems : innovations, mechanics and applications : proceedings of the 7th International Conference on Structural Engineering, Mechanics, and Computation (SEMC 2019), September 2-4, 2019, Cape Town, South Africa Y1 - 2019 SN - 978-1-138-38696-9 SP - 896 EP - 901 PB - Taylor & Francis Group CY - London ER - TY - GEN A1 - Launert, Benjamin A1 - Li, Zheng A1 - Pasternak, Hartmut ED - Zingoni, Alphose T1 - Development of a new method for the direct numerical consideration of welding effects in the component design of welded plate girders T2 - Advances in engineering materials, structures and systems : innovations, mechanics and applications : proceedings of the 7th International Conference on Structural Engineering, Mechanics, and Computation (SEMC 2019), September 2-4, 2019, Cape Town, South Africa Y1 - 2019 SN - 978-1-138-38696-9 SP - 1143 EP - 1147 PB - Taylor & Francis Group CY - London ER - TY - GEN A1 - Li, Zheng A1 - Pasternak, Hartmut A1 - Ciupack, Yvonne ED - Zingoni, Alphose T1 - Artificial neural network prediction of bearing capacity of welded columns based on simplified welding simulations T2 - Advances in engineering materials, structures and systems : innovations, mechanics and applications : proceedings of the 7th International Conference on Structural Engineering, Mechanics, and Computation (SEMC 2019), September 2-4, 2019, Cape Town, South Africa Y1 - 2019 SN - 978-1-138-38696-9 SP - 1219 EP - 1223 PB - Taylor & Francis Group CY - London ER - TY - GEN A1 - Kasper, Yann A1 - Albiez, Matthias A1 - Ummenhofer, Thomas A1 - Ciupack, Yvonne A1 - Ledecky, Lukas A1 - Pasternak, Hartmut A1 - Geßler, Achim A1 - Feldmann, Markus ED - Zingoni, Alphose T1 - Application of carbon fibre composite materials for the rehabilitation of fatigue damaged steel structures T2 - Advances in engineering materials, structures and systems : innovations, mechanics and applications : proceedings of the 7th International Conference on Structural Engineering, Mechanics, and Computation (SEMC 2019), September 2-4, 2019, Cape Town, South Africa Y1 - 2019 SN - 978-1-138-38696-9 SP - 2148 EP - 2153 PB - Taylor & Francis Group CY - London ER - TY - GEN A1 - Stapelfeld, Christoph A1 - Launert, Benjamin A1 - Pasternak, Hartmut A1 - Doynov, Nikolay A1 - Michailov, Vesselin T1 - Improve load capacity calculations by considering realistic imperfections induced by welding for plates and shells T2 - Stability and ductility of steel structures 2019 : proceedings of the International Colloquia on Stability and Ductility of Steel Structures (SDSS 2019), September 11-13, 2019, Prague, Czech Republic Y1 - 2019 UR - https://www.b-tu.de/fg-stahlbau/publikationen/veroeffentlichungen SN - 978-0-367-33503-8 SP - 1059 EP - 1067 PB - CRC Press CY - Boca Raton ER - TY - GEN A1 - Shoushtarian Mofrad, Ashkan A1 - Shlychkova, Darita A1 - Ciupack, Yvonne A1 - Pasternak, Hartmut T1 - FE Modelling of Sandwich Panels with Screwed Joint at Elevated Temperatures T2 - XVIII ANNIVERSARY INTERNATIONAL SCIENTIFIC CONFERENCE BY CONSTRUCTION AND ARCHITECTURE VSU'2018, At Sofia, Bulgaria N2 - Understanding and predicting sandwich structure behavior in fire has been of particular interest to researchers for a long time. Sandwich panel joints are playing an important role since they not only connect sandwiches to a bearing structure, but also play a key role in stabilization of the whole building. This paper presents an investigation of a sandwich panel behavior. The sandwich panel consist of two steel layers and PIR core between them and is connected to a HEA 160 flange with the help of a screw. Using ABAQUS software, this connection is modelled and deformation fields with temperature distribution area are analyzed. The modelling process includes many stages associated with each other: static, heat transfer and sequential analysis that includes both previous analyses. Y1 - 2018 UR - https://www.researchgate.net/publication/342522191_FE_MODELLING_OF_SANDWICH_PANELS_WITH_SCREWED_JOINT_AT_ELEVATED_TEMPERATURES ER - TY - GEN A1 - Shlychkova, Darita A1 - Pasternak, Hartmut T1 - Numerical analysis and laboratory experiments of lightweight structured sandwich beams made of steel T2 - Proceedings VII International Scientific Conference VSU 2017, 8-9 Juni 2017, Sofia, Bulgaria N2 - Using special technology it is possible to produce thin steel plates with a 3-D structure - hexagonal staggered pattern. Such sheets find a range of application in automotive and aerospace industry. The question is: Can we use those sheets also for building applications? Therefore their behaviour under external loads has to be studied. As an example beams with C-section made of structured sheets under concentrated force in the middle of the upper flange are investigated. This article provides information about load capacity of beams, assembled from structured plates with different thickness. Using Abaqus software beams were modelled and deformation fields for each of them were analyzed. To compare computer calculations with actual results, real sized beams made of structured sheets were constructed in laboratory and bending tests were conducted. Y1 - 2017 SN - 1314-071X VL - Volume 1 SP - 252 EP - 260 CY - Sofia, Bulgaria ER - TY - GEN A1 - Pasternak, Hartmut A1 - Li, Zheng A1 - Stapelfeld, Christoph A1 - Jäger-Cañás, Andreas A1 - Launert, Benjamin T1 - Considering realistic weld imperfections in load bearing capacity calculations of ring-stiffened shells using the analytical numerical hybrid model T2 - Stability and Ductility of Steel Structures 2019 : Proceedings of the International Colloquia on Stability and Ductility of Steel Structures (SDSS 2019), September 11-13, 2019, Prague, Czech Republic Y1 - 2019 SN - 978-0-429-32024-8 SN - 978-0-367-33503-8 U6 - https://doi.org/10.1201/9780429320248 SP - 882 EP - 889 PB - CRC Press CY - London ET - 1st Edition ER - TY - GEN A1 - Jäger-Cañás, Andreas A1 - Li, Zheng A1 - Pasternak, Hartmut T1 - Axial buckling behavior of welded ring-stiffened shells T2 - Stability and Ductility of Steel Structures 2019 : Proceedings of the International Colloquia on Stability and Ductility of Steel Structures (SDSS 2019), September 11-13, 2019, Prague, Czech Republic Y1 - 2019 SN - 978-0-429-32024-8 SN - 978-0-367-33503-8 U6 - https://doi.org/10.1201/9780429320248 SP - 556 EP - 563 PB - CRC Press CY - London ET - 1st Edition ER - TY - GEN A1 - Loebjinski, Maria A1 - Rug, Wolfgang A1 - Pasternak, Hartmut T1 - The influence of an improved strength grading in situ on modelling timber strength properties T2 - Proceedings of the International Conference on Structural Health Assessment of Timber Structures, SHATiS´2019 Y1 - 2019 SN - 978-989-54496-2-0 SP - 619 EP - 628 PB - Universidade do Minho Departamento de Engenharia Civi CY - Guimarães, Portugal ER - TY - GEN A1 - Loebjinski, Maria A1 - Linke, Gunter A1 - Rug, Wolfgang A1 - Pasternak, Hartmut T1 - Redevelopment of a wooden roof construction under preservation order T2 - Proceedings of the International Conference on Structural Health Assessment of Timber Structures, SHATiS´2019 Y1 - 2019 SN - 978-989-54496-2-0 SP - 912 EP - 921 PB - Universidade do Minho Departamento de Engenharia Civi CY - Guimarães, Portugal ER - TY - GEN A1 - Loebjinski, Maria A1 - Linke, Gunter A1 - Rug, Wolfgang A1 - Pasternak, Hartmut T1 - Evaluation of existing timber structures – Current standards for the assessment and evaluation in Germany and Europe T2 - Proceedings of the International Conference on Structural Health Assessment of Timber Structures, SHATiS´2019 Y1 - 2019 SN - 978-989-54496-2-0 SP - 884 EP - 893 PB - Universidade do Minho Departamento de Engenharia Civi CY - Guimarães, Portugal ER - TY - GEN A1 - Ciupack, Yvonne A1 - Ledecky, Lukas A1 - Kasper, Yann A1 - Geßler, Achim A1 - Albiez, Matthias A1 - Pasternak, Hartmut A1 - Ummenhofer, Thomas A1 - Feldmann, Markus ED - Juozapaitis, Algirdas ED - Daniūnas, Alfonsas ED - Juknevičius, Linas T1 - Strengthening of steel structures with fatigue cracks using adhesively bonded non-prestressed and prestressed CFRP lamellas T2 - The 13th International Conference MODERN BUILDING MATERIALS, STRUCTURES AND TECHNIQUES, 16–17 May 2019, Vilnius, Lithuania Vilnius Gediminas Technical University N2 - In comparison to classic strengthening methods of fatigue-damaged steel structures, adhesively bonded CFRP lamellas show several advantages. Compared to bolted reinforcement measures and the drilling of the crack tip, crosssectional weakening is avoided. Heat-induced, negatively acting residual stresses and distortions, usually occurring during repair welding, can also be excluded. Therefore, the effectiveness of adhesively bonded CFRP lamellas to enhance the remaining lifetime of fatigue damaged steel structures is examined in a German research project. Selected results are presented in this paper. To characterize the steel, CFRP and adhesive materials, different tests on small scale specimens are carried out. With the help of fatigue tests on CT-samples the remaining fatigue lifetimes of specimens strengthened with adhesively bonded CFRP lamellas is compared to the remaining lifetimes of specimens strengthened by established methods such as drilling the crack tip and repair welding. Based on the evaluation of the crack propagation after the rehabilitation measures, the great potential of adhesively bonded CFRP reinforcements can be deduced. By prestressing the lamellas, the remaining lifetime can generally be increased further. The combination of adhesively bonded CFRP lamellas together with established rehabilitation methods shows a particularly high positive influence on the remaining lifetime of the CT-specimens. Y1 - 2019 SN - 978-609-476-197-3 U6 - https://doi.org/10.3846/mbmst.2019.068 SN - 2029-9915 SP - 252 EP - 260 ER - TY - GEN A1 - Sternsdorff, Florian A1 - Ciupack, Yvonne A1 - Yilmaz, Emre Mehmet A1 - Pasternak, Hartmut A1 - Vayas, Ioannis T1 - Investigations on beam-to-column connections reinforced with adhesively bonded CFRP lamellas T2 - 7th International Conference Civil Engineering – Science and Practice (GNP), Kolašin, 10.-14. March 2020, Book of abstracts N2 - Against the background of the earthquake-proof design of steel structures, it makes sense to use structures with sufficient ductility and energy dissipation capacity. The joints are often a weak point in such systems. Methods for reinforcing beam-to-column connections with the aid of adhesively bonded CFRP products are the subject of the work. Advantages of such reinforcement methods are the avoidance of residual stresses (compared to welded steel lamellas), avoidance of cross-sectional weakening (in comparison to bolted solutions) and, above all, the possibility of retrofitting existing steel structures. Y1 - 2020 UR - https://www.researchgate.net/publication/340165474_INVESTIGATIONS_ON_BEAM-TO-COLUMN_CONNECTIONS_REINFORCED_WITH_ADHESIVELY_BONDED_CFRP_LAMELLAS ER - TY - GEN A1 - Pasternak, Hartmut A1 - Krausche, Thomas T1 - Design, Construction and Assembly of two Membrane-Cladded Double-Curved Net Roofs T2 - 7th International Conference Civil Engineering – Science and Practice (GNP), Kolašin, 10-14 March 2020, Book of abstracts Y1 - 2020 UR - https://de.scribd.com/document/463209242/Pasternak-Krausche-GNP2020-pdf ER - TY - GEN A1 - Shoushtarian Mofrad, Ashkan A1 - Shlychkova, Darita A1 - Ciupack, Yvonne A1 - Pasternak, Hartmut T1 - Study of Bending, Translational and Torsional Stiffness of Sandwich Panels in Fire T2 - 7th International Conference Civil Engineering – Science and Practice (GNP), Kolašin, 10-14 March 2020, Book of abstracts Y1 - 2020 UR - https://www.researchgate.net/publication/340163960_2020_GNP_sandwich_panels_in_fire ER - TY - GEN A1 - Pasternak, Hartmut A1 - Ciupack, Yvonne ED - Georgiev, Vanyo ED - Stoynova, Iliana T1 - Use of CFRP for the Rehabilitation of Fatigue Damaged Steel Structures - Only a Nice Idea? T2 - XX International Scientific Conference VSU'2020 on Construction and Architecture Book of Abstracts Y1 - 2020 UR - https://www-docs.b-tu.de/fg-stahlbau/public/Fachgebiet_Stahlbau/publikationen/2020_VSU_Pasternak_Ciupack.pdf SN - 1314-071X ER - TY - GEN A1 - Wang, Jian A1 - Euler, Mathias A1 - Pasternak, Hartmut A1 - Li, Zheng A1 - Krausche, Thomas A1 - Launert, Benjamin T1 - Bending capacity of single and double-sided welded I-section girders: Part 1: Experimental investigations T2 - Current Perspectives and New Directions in Mechanics, Modelling and Design of Structural Systems : Proceedings of The Eighth International Conference on Structural Engineering, Mechanics and Computation, 5-7 September 2022, Cape Town, South Africa N2 - The lateral-torsional buckling resistance of welded steel girders is affected by their residual stresses and geo-metric imperfections. Generally, both influences are mainly controlled by the manufacturing process, in partic-ular the welding of the girder. This paper presents experimental investigations on four laterally unbraced welded steel girders with thin-walled I-sections, whose flange-to-web junctions are welded from one or two sides to evaluate the fabrication influence. The investigations include lateral-torsional buckling tests under combined bending and torsion loading caused by three-point bending due to an eccentric vertical single force. The geometric imperfections of the welded test girders are determined by 3D laser scanning. The test results show that the influence of the geometric imperfections and the residual stresses on the lateral-torsional buck-ling resistance is limited for the tested girders. KW - Experimental investigations KW - single and double-sided welds KW - imperfections KW - lateral-torsional buckling KW - 3D laser scanning Y1 - 2022 SN - 978-1-00-334845-0 U6 - https://doi.org/10.1201/9781003348443-159 SP - 975 EP - 980 PB - CRC Press CY - Boca Raton ER - TY - GEN A1 - Wang, Jian A1 - Li, Zheng A1 - Pasternak, Hartmut A1 - Euler, Mathias T1 - Shear Buckling Behavior of Tapered Steel Plate Girders with Sinusoidally Corrugated Webs T2 - ce/papers KW - Plate girders KW - Shear Buckling KW - Tapered plate girders KW - Sinusoidal Corrugated Webs KW - Résal effect Y1 - 2023 U6 - https://doi.org/10.1002/cepa.2534 SN - 2509-7075 VL - 6 IS - 3-4 SP - 1787 EP - 1792 ER -