TY - GEN A1 - Dong, Jiwu A1 - Li, Zheng A1 - Pasternak, Hartmut A1 - Ciupack, Yvonne T1 - Reinforcement of Fatigue Damaged Steel Structures Using CFRP Lamellas - Part 3: Numerical Simulation T2 - Bauingenieur Y1 - 2020 SN - 0005-6650 SN - 1436-4867 VL - 96 IS - 10 SP - 362 EP - 368 ER - TY - GEN A1 - Pasternak, Hartmut A1 - Ciupack, Yvonne ED - Georgiev, Vanyo ED - Stoynova, Iliana T1 - Use of CFRP for the Rehabilitation of Fatigue Damaged Steel Structures - Only a Nice Idea? T2 - XX International Scientific Conference VSU'2020 on Construction and Architecture Book of Abstracts Y1 - 2020 UR - https://www-docs.b-tu.de/fg-stahlbau/public/Fachgebiet_Stahlbau/publikationen/2020_VSU_Pasternak_Ciupack.pdf SN - 1314-071X ER - TY - GEN A1 - Kasper, Yann A1 - Albiez, Matthias A1 - Ummenhofer, Thomas A1 - Mayer, Christoph A1 - Meier, Tobias A1 - Choffat, Fabien A1 - Ciupack, Yvonne A1 - Pasternak, Hartmut T1 - Application of toughened epoxy-adhesives for strengthening of fatigue-damaged steel structures T2 - Construction and Building Materials Y1 - 2021 U6 - https://doi.org/10.1016/j.conbuildmat.2020.121579 SN - 0950-0618 VL - 275 ER - TY - GEN A1 - Li, Zheng A1 - Pasternak, Hartmut T1 - Statistischer Maßstabseffekt und seine Bedeutung für die Zuverlässigkeit im Stahlbau,Teil 1 – Modell und Versuch T2 - Bautechnik Y1 - 2020 U6 - https://doi.org/10.1002/bate.202000030 VL - 97 IS - 11 SP - 766 EP - 772 ER - TY - GEN A1 - Li, Zheng A1 - Loebjinski, Maria A1 - Pasternak, Hartmut T1 - Statistischer Maßstabseffekt und seine Bedeutung für die Zuverlässigkeit im Stahlbau, Teil 2‐ Zuverlässigkeitsanalyse T2 - Bautechnik Y1 - 2020 U6 - https://doi.org/10.1002/bate.202000031 VL - 97 IS - 11 SP - 773 EP - 779 ER - TY - GEN A1 - Li, Zheng A1 - Pasternak, Hartmut A1 - Robra, Jörgen T1 - Tragverhalten von Wellstegträgern mit kreisförmigem Öffnungskranz T2 - Bauingenieur Y1 - 2021 U6 - https://doi.org/10.37544/0005-6650-2021-04-50 SN - 0005-6650 VL - 96 IS - 4 SP - 114 EP - 120 ER - TY - BOOK A1 - Pasternak, Hartmut A1 - Stapelfeld, Christoph A1 - Launert, Benjamin A1 - Michailov, Vesselin A1 - Doynov, Nikolay T1 - Ermittlung der Tragfähigkeit neuartiger stählerner Schalenbauwerke unter realitätsnaher Berücksichtigung des Schweißverzugs Y1 - 2020 SN - 978-3-946885-89-4 PB - Forschungsvereinigung Stahlanwendung e. V. CY - Düsseldorf ER - TY - GEN A1 - Sternsdorff, Florian A1 - Ciupack, Yvonne A1 - Pasternak, Hartmut T1 - Experimental Investigations on Innovative Crack Repair Methods and reinforcing Steel Structures with Adhesivly Bonded CFRP - Lamellas T2 - Engineering Structures and Technologies Y1 - 2021 U6 - https://doi.org/10.3846/est.2021.15036 SN - 2029-882X SN - 2029-8838 VL - 13 IS - 1 SP - 1 EP - 6 ER - TY - GEN A1 - Wang, Jian A1 - Li, Zheng A1 - Robra, Jörgen A1 - Pasternak, Hartmut A1 - Euler, Mathias T1 - Investigation on Shear Buckling of Corrugated Web Beams with Reinforced Web Openings T2 - ce/papers N2 - Corrugated web beams are welded I‐sections with thin‐walled sinusoidal corrugated webs and flanges made of wide flat steel that have been developed as an alternative to steel girders with flat webs. In comparison with hot‐rolled or welded I‐beams with flat webs, corrugated web beams are connected with considerable material savings and fully automated production. Assuming the same load‐bearing capacity, corrugated web beams are lighter than those with a flat web, since the corrugated web beams can often be loaded up to their plastic resistance without reinforcement of the web. The research on the load‐bearing behavior of corrugated web beams without web openings is relatively mature. However, the resistance of corrugated web beams with reinforced web openings, as they are often used in buildings for installations, has not well experimentally been investigated, yet. This paper deals with the shear resistance of corrugated web beams with reinforced square web openings. Three specimens of different geometry with two square web openings were tested. The experiments are compared with a Finite Element Analysis by Abaqus® and with an analytical model allowing simplified calculation. Both models can relatively accurately calculate the shear resistance. The experimental and numerical results show that the increase of the shear resistance of perforated corrugated web beams depends on the wall‐thickness and the steel grade of the web opening reinforcement. KW - Corrugated web beams KW - square web openings KW - ring stiffener KW - local shear buckling KW - experimental investigation KW - finite element analysis Y1 - 2022 U6 - https://doi.org/10.1002/cepa.1800 SN - 2509-7075 VL - 5 IS - 4 SP - 628 EP - 634 ER - TY - GEN A1 - Li, Zheng A1 - Zhang, Qiulei A1 - Shi, Fei A1 - Wang, Jian A1 - Pasternak, Hartmut T1 - Geometric Properties of Steel Components with Stability and Fatigue Risks Using 3D-Laser-Scanning T2 - Buildings N2 - Nowadays, 3D laser scanning technology is extensively employed in laboratory investigations of steel structural components, providing accurate geometric dimensions to reduce uncertainties caused by indeterminate geometry in experimental results. It is often used in conjunction with the Finite Element (FE) Method and analytical solutions, which are more accurate deterministic operators in the research on steel structures. However, establishing a common methodological framework for transferring or mapping 3D-scanned information into finite element models for complex steel structures with stability and fatigue risks remains an ongoing task. In light of this, this study has developed a 3D scanning platform capable of obtaining accurate geometric dimensions for various types of steel components. Different coordinate systems and point cloud mapping algorithms have been established for different types of components to construct actual finite element models with initial imperfections. The feasibility of the self-developed 3D scanning platform and finite element modelling has been validated through three experimental cases: weld details, steel girders, and cylindrical shells. The research findings demonstrate that the captured point cloud can be automatically processed and corrected using the developed algorithm. The scanned data can then be input into the numerical model using various mapping algorithms tailored to the specific geometric properties of the specimens. The differences between the experimental test results and the simulated results obtained from the 3D-scanned finite element models remain within a small range. The self-developed 3D scanning platform and finite element modelling technique effectively capture the actual dimensions of different steel components, enabling the prediction of their stability and fatigue risks through numerical simulations. KW - 3D laser scanning KW - steel structures KW - geometric properties KW - stability KW - fatigue Y1 - 2024 U6 - https://doi.org/10.3390/buildings14010168 SN - 2075-5309 VL - 14 IS - 1 ER - TY - GEN A1 - Wang, Jian A1 - Euler, Mathias A1 - Pasternak, Hartmut A1 - Li, Zheng A1 - Krausche, Thomas A1 - Launert, Benjamin T1 - Bending capacity of single and double-sided welded I-section girders: Part 1: Experimental investigations T2 - Current Perspectives and New Directions in Mechanics, Modelling and Design of Structural Systems : Proceedings of The Eighth International Conference on Structural Engineering, Mechanics and Computation, 5-7 September 2022, Cape Town, South Africa N2 - The lateral-torsional buckling resistance of welded steel girders is affected by their residual stresses and geo-metric imperfections. Generally, both influences are mainly controlled by the manufacturing process, in partic-ular the welding of the girder. This paper presents experimental investigations on four laterally unbraced welded steel girders with thin-walled I-sections, whose flange-to-web junctions are welded from one or two sides to evaluate the fabrication influence. The investigations include lateral-torsional buckling tests under combined bending and torsion loading caused by three-point bending due to an eccentric vertical single force. The geometric imperfections of the welded test girders are determined by 3D laser scanning. The test results show that the influence of the geometric imperfections and the residual stresses on the lateral-torsional buck-ling resistance is limited for the tested girders. KW - Experimental investigations KW - single and double-sided welds KW - imperfections KW - lateral-torsional buckling KW - 3D laser scanning Y1 - 2022 SN - 978-1-00-334845-0 U6 - https://doi.org/10.1201/9781003348443-159 SP - 975 EP - 980 PB - CRC Press CY - Boca Raton ER - TY - GEN A1 - Li, Zheng A1 - Xu, Siying A1 - Geißler, Karsten A1 - Wang, Jian A1 - Pasternak, Hartmut T1 - Developed numerical Analysis of Residual Stress caused by Welding and Cutting in Steel Structures T2 - ce/papers N2 - The welding and flame‐cutting process in the steel construction are commonly used, especially for the bridge structure. Some experiments about welding and cutting have been done separately by some researchers. The results from the experiments were also compared with the results from the numerical simulation under 3D or 2D models. The agreements between those results are as good as they predicted. Therefore, the numerical simulation is a better way to analyze the quality of the steel construction after welding and cutting without time‐consuming and a large amount of cost. But there are only a few research about the numerical simulation and the some of them are aimed to verify the experiments. In this study, the calculation about the residual stresses after welding and thermo‐cutting are considered from 3D‐model into 2D‐Model. The heat source model is simply regarded as curves of time and welding energy with the algorithm methods. And no matter the change of the parameters of the model and the heat source, the heat transfer and the residual stresses can be calculated with the 2D models as fast as possible. By the means of the finite element software Abaqus, the I‐profiles are easy to receive the job results with the input parameters. The influence of the welding and cutting process are visual and direct. KW - Welding KW - Flame cutting KW - Numerical simulation KW - Residual stress KW - Steel structures Y1 - 2023 U6 - https://doi.org/10.1002/cepa.2601 SN - 2509-7075 VL - 6 IS - 3-4 SP - 1507 EP - 1512 ER - TY - GEN A1 - Wang, Jian A1 - Li, Zheng A1 - Pasternak, Hartmut A1 - Euler, Mathias T1 - Shear Buckling Behavior of Tapered Steel Plate Girders with Sinusoidally Corrugated Webs T2 - ce/papers KW - Plate girders KW - Shear Buckling KW - Tapered plate girders KW - Sinusoidal Corrugated Webs KW - Résal effect Y1 - 2023 U6 - https://doi.org/10.1002/cepa.2534 SN - 2509-7075 VL - 6 IS - 3-4 SP - 1787 EP - 1792 ER - TY - GEN A1 - Wang, Jian A1 - Li, Zheng A1 - Pasternak, Hartmut A1 - Euler, Mathias T1 - Querkrafttragfähigkeit von Wellstegträgern mit versteiften quadratischen Stegöffnungen T2 - Bauingenieur N2 - Die Ergebnisse aus drei Traglastversuchen und einer umfangreichen numerischen Parameterstudie (FE-Berechnungen) zum Tragverhalten von Wellstegträgern mit quadratischen Stegöffnungen werden vorgestellt. Es werden versteifte Stegöffnungen mit einem umlaufenden Versteifungskranz betrachtet. In der Parameterstudie werden die Einflüsse der Stegöffnungsgeometrie, der Trägergeometrie und der Position der Stegöffnung auf die Querkrafttragfähigkeit der Wellstegträger untersucht. KW - Wellstegträger KW - Stegöffnung KW - Versteifungskranz Y1 - 2023 U6 - https://doi.org/10.37544/0005-6650-2023-11-31 SN - 0005-6650 VL - 98 IS - 11 SP - 343 EP - 353 ER -