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 - GEN A1 - Ledecky, Lukas A1 - Ciupack, Yvonne A1 - Pasternak, Hartmut A1 - Fischer, Vitali A1 - Stammen, Elisabeth A1 - Dilger, Klaus T1 - Lebensdauer von zyklisch beanspruchten Klebverbindungen im Stahlbau -Teil 1: Einflüsse auf das Tragverhalten T2 - Bauingenieur Y1 - 2019 SN - 0005-6650 VL - 94 IS - 1 SP - 29 EP - 35 ER - TY - GEN A1 - Ciupack, Yvonne A1 - Ledecky, Lukas A1 - Pasternak, Hartmut A1 - Fischer, Vitali A1 - Stammen, Elisabeth A1 - Dilger, Klaus T1 - Lebensdauer von zyklischen beanspruchten Klebverbindungen im Stahlbau - Teil 2: Untersuchungen zur Betriebsfestigkeitsprüfung einer Klebverbindung T2 - Bauingenieur Y1 - 2019 SN - 0005-6650 VL - 94 IS - 2 SP - 56 EP - 62 ER - TY - GEN A1 - Li, Zheng A1 - Pasternak, Hartmut T1 - Experimental and numerical investigations of statistical size effect in S235JR steel structural elements T2 - Construction and Building Materials N2 - This paper presents the analysis of the statistical size effect in steel structural elements using the stochastic finite element (FE) method. The three-dimensional random field theory is applied to simulate the uncertainty of a nonlinear material. The proposed approach, which combines the discrete random field describing the randomness of the material properties via Monte Carlo simulations, is used for computing the bearing capacity variability of the steel structures. In addition, the mapping interpolation method makes it possible to separate the random field mesh and FE model mesh. The three-dimensional random field for the material properties is established according to the yield strength with a lognormal distribution based on reasonable assumptions, and the corresponding random field parameters are studied. Finally, the results of experimental investigation and simulations are compared based on the tensile and bending tests, and they indicate that the statistical size effect cannot be overlooked in S235JR steel structural elements and that the use of stochastic FE in the analysis of the statistical size effect has tremendous potential. KW - 3D Random field KW - Stochastic finite element method KW - Mapping interpolation method KW - Statistical size effect KW - Steel structural elements Y1 - 2019 U6 - https://doi.org/10.1016/j.conbuildmat.2019.02.106 SN - 0950-0618 VL - 206 SP - 665 EP - 673 ER - TY - GEN A1 - Ciupack, Yvonne A1 - Pasternak, Hartmut A1 - Geßler, Achim A1 - Feldmann, Markus A1 - Kasper, Yann A1 - Albiez, Matthias A1 - Ummenhofer, Thomas T1 - Repair of Fatigue Cracked CT-specimens Using Adhesively Bonded CFRP Lamellas T2 - 27th Annual International Conference on Composites / Nano Engineering ICCE-27 Y1 - 2019 UR - https://www.b-tu.de/fg-stahlbau/publikationen/veroeffentlichungen ER - TY - GEN A1 - Ciupack, Yvonne A1 - Pasternak, Hartmut T1 - Some Remarks about the New Generation of prEN 1993-1-1 T2 - 27th Annual International Conference on Composites / Nano Engineering ICCE-27 Y1 - 2019 UR - https://www.b-tu.de/fg-stahlbau/publikationen/veroeffentlichungen ER - TY - GEN A1 - Tankova, Trayana A1 - Silva, Luís Simões da A1 - Balakrishnam, Marimuthu A1 - Rodrigues, Dulce A1 - Launert, Benjamin A1 - Pasternak, Hartmut A1 - Tun, Tin Yadanar T1 - Residual stresses in welded I section steel members T2 - Engineering Structures N2 - Residual stresses have major influence on the stability of steel members. It is well-known that, due to the differences in manufacturing procedures, the residual stresses for welded and hot – rolled members are rather different. In the same way, despite several studies on residual stresses distribution and magnitude for hot-rolled members were already done, for prismatic and tapered welded I section steel members the investigation is still very scarce. In the current work, an experimental programme on the buckling resistance of tapered members, with different tapering ratios and section heights, was conducted and residual stress measurements were carried out using the sectioning method. Numerical simulations of the heat input during welding were also performed in order to predict the residual stress fields. A statistical analysis of the residual stresses distribution for welded I section members was performed, using the experimental and numerical results, as well as literature data. Systematized information on residual stresses distribution and magnitude was generated and some guidelines for the statistical characterization of residual stresses in welded members were proposed. KW - Residual stresses KW - Welded sections KW - Steel KW - Eurocode 3 KW - Stability KW - Welding simulation KW - I section KW - Experimental tests Y1 - 2019 U6 - https://doi.org/10.1016/j.engstruct.2019.109398 SN - 0141-0296 VL - 197 ER - TY - GEN A1 - Doynov, Nikolay A1 - Stapelfeld, Christoph A1 - Michailov, Vesselin A1 - Pasternak, Hartmut A1 - Launert, Benjamin ED - Sommitsch, Christof ED - Enzinger, Norbert ED - Mayr, Peter T1 - Distortion analysis of large scaled welded structures T2 - Mathematical Modelling of Weld Phenomena 12 : selected peer reviewed papers from the 12th International Seminar Numerical Analysis of Weldability : September 23-26, 2018, Graz, Schloss Seggau - Austria N2 - The work presents an innovative approach for simulation of welding induced distortions, which allows taking into consideration the local effects of the welding process as well as the global interactions in the structure. The approach bases on an integration of analytical and numerical calculation’s procedures in a hybrid model, realized with the aid of the inherent strain concept. The analytical procedure calculates the shrinkage strain components and area of the plastic deformed zone, caused by welding. The calculated strains are then transferred to the global finite element model in order to predict the distortions and stresses in the structure after every welding stage, as well as their final state. The consideration of welding scenarios, weld sequence, clamping conditions and the assembling stages is done by taking into account the intermediate variation of the strain state during the manufacturing steps. The article gives the theoretical basis of the analytical model. The consideration of the essential physical relations is put into discussion. The application of the model is illustrated on complex structures. Its reliability and practicability are demonstrated by means of a validation study. Y1 - 2019 SN - 978-3-85125-615-4 U6 - https://doi.org/10.3217/978-3-85125-615-4 SP - 254 EP - 280 PB - Verlag der Technischen Universität Graz CY - Graz ER - TY - GEN A1 - Pasternak, Hartmut A1 - Krausche, Thomas ED - Zingoni, Alphose T1 - Details and assembly of two cladded double curved cable net roofs T2 - Advances in engineering materials, structures and systems : innovations, mechanics and applications : proceedings of the 7th International Conference on Structural Engineering, Mechanics, and Computation (SEMC 2019), September 2-4, 2019, Cape Town, South Africa Y1 - 2019 SN - 978-1-138-38696-9 SP - 896 EP - 901 PB - Taylor & Francis Group CY - London ER - TY - GEN A1 - Launert, Benjamin A1 - Li, Zheng A1 - Pasternak, Hartmut ED - Zingoni, Alphose T1 - Development of a new method for the direct numerical consideration of welding effects in the component design of welded plate girders T2 - Advances in engineering materials, structures and systems : innovations, mechanics and applications : proceedings of the 7th International Conference on Structural Engineering, Mechanics, and Computation (SEMC 2019), September 2-4, 2019, Cape Town, South Africa Y1 - 2019 SN - 978-1-138-38696-9 SP - 1143 EP - 1147 PB - Taylor & Francis Group CY - London ER - TY - GEN A1 - Li, Zheng A1 - Pasternak, Hartmut A1 - Ciupack, Yvonne ED - Zingoni, Alphose T1 - Artificial neural network prediction of bearing capacity of welded columns based on simplified welding simulations T2 - Advances in engineering materials, structures and systems : innovations, mechanics and applications : proceedings of the 7th International Conference on Structural Engineering, Mechanics, and Computation (SEMC 2019), September 2-4, 2019, Cape Town, South Africa Y1 - 2019 SN - 978-1-138-38696-9 SP - 1219 EP - 1223 PB - Taylor & Francis Group CY - London ER - TY - GEN A1 - Kasper, Yann A1 - Albiez, Matthias A1 - Ummenhofer, Thomas A1 - Ciupack, Yvonne A1 - Ledecky, Lukas A1 - Pasternak, Hartmut A1 - Geßler, Achim A1 - Feldmann, Markus ED - Zingoni, Alphose T1 - Application of carbon fibre composite materials for the rehabilitation of fatigue damaged steel structures T2 - Advances in engineering materials, structures and systems : innovations, mechanics and applications : proceedings of the 7th International Conference on Structural Engineering, Mechanics, and Computation (SEMC 2019), September 2-4, 2019, Cape Town, South Africa Y1 - 2019 SN - 978-1-138-38696-9 SP - 2148 EP - 2153 PB - Taylor & Francis Group CY - London ER - TY - GEN A1 - Stapelfeld, Christoph A1 - Launert, Benjamin A1 - Pasternak, Hartmut A1 - Doynov, Nikolay A1 - Michailov, Vesselin T1 - Improve load capacity calculations by considering realistic imperfections induced by welding for plates and shells T2 - Stability and ductility of steel structures 2019 : proceedings of the International Colloquia on Stability and Ductility of Steel Structures (SDSS 2019), September 11-13, 2019, Prague, Czech Republic Y1 - 2019 UR - https://www.b-tu.de/fg-stahlbau/publikationen/veroeffentlichungen SN - 978-0-367-33503-8 SP - 1059 EP - 1067 PB - CRC Press CY - Boca Raton ER - TY - GEN A1 - Pasternak, Hartmut A1 - Li, Zheng A1 - Stapelfeld, Christoph A1 - Jäger-Cañás, Andreas A1 - Launert, Benjamin T1 - Considering realistic weld imperfections in load bearing capacity calculations of ring-stiffened shells using the analytical numerical hybrid model T2 - Stability and Ductility of Steel Structures 2019 : Proceedings of the International Colloquia on Stability and Ductility of Steel Structures (SDSS 2019), September 11-13, 2019, Prague, Czech Republic Y1 - 2019 SN - 978-0-429-32024-8 SN - 978-0-367-33503-8 U6 - https://doi.org/10.1201/9780429320248 SP - 882 EP - 889 PB - CRC Press CY - London ET - 1st Edition ER - TY - GEN A1 - Jäger-Cañás, Andreas A1 - Li, Zheng A1 - Pasternak, Hartmut T1 - Axial buckling behavior of welded ring-stiffened shells T2 - Stability and Ductility of Steel Structures 2019 : Proceedings of the International Colloquia on Stability and Ductility of Steel Structures (SDSS 2019), September 11-13, 2019, Prague, Czech Republic Y1 - 2019 SN - 978-0-429-32024-8 SN - 978-0-367-33503-8 U6 - https://doi.org/10.1201/9780429320248 SP - 556 EP - 563 PB - CRC Press CY - London ET - 1st Edition ER - TY - GEN A1 - Loebjinski, Maria A1 - Rug, Wolfgang A1 - Pasternak, Hartmut T1 - The influence of an improved strength grading in situ on modelling timber strength properties T2 - Proceedings of the International Conference on Structural Health Assessment of Timber Structures, SHATiS´2019 Y1 - 2019 SN - 978-989-54496-2-0 SP - 619 EP - 628 PB - Universidade do Minho Departamento de Engenharia Civi CY - Guimarães, Portugal ER - TY - GEN A1 - Loebjinski, Maria A1 - Linke, Gunter A1 - Rug, Wolfgang A1 - Pasternak, Hartmut T1 - Redevelopment of a wooden roof construction under preservation order T2 - Proceedings of the International Conference on Structural Health Assessment of Timber Structures, SHATiS´2019 Y1 - 2019 SN - 978-989-54496-2-0 SP - 912 EP - 921 PB - Universidade do Minho Departamento de Engenharia Civi CY - Guimarães, Portugal ER - TY - GEN A1 - Loebjinski, Maria A1 - Linke, Gunter A1 - Rug, Wolfgang A1 - Pasternak, Hartmut T1 - Evaluation of existing timber structures – Current standards for the assessment and evaluation in Germany and Europe T2 - Proceedings of the International Conference on Structural Health Assessment of Timber Structures, SHATiS´2019 Y1 - 2019 SN - 978-989-54496-2-0 SP - 884 EP - 893 PB - Universidade do Minho Departamento de Engenharia Civi CY - Guimarães, Portugal ER - TY - GEN A1 - Feldmann, Markus A1 - Ummenhofer, Thomas A1 - Geßler, Achim A1 - Pasternak, Hartmut A1 - Kasper, Yann A1 - Albiez, Matthias A1 - Ciupack, Yvonne A1 - Ledecky, Lukas T1 - Einsatz geklebter CFK-Lamellen zur Verstärkung ermüdungsgeschädigter Stahlkonstruktionen T2 - Schweissen und Schneiden: Fachzeitschrift für Schweißen und verwandte Verfahren Y1 - 2019 SN - 0036-7184 IS - 11 SP - 738 EP - 745 ER - TY - GEN A1 - Ciupack, Yvonne A1 - Ledecky, Lukas A1 - Kasper, Yann A1 - Geßler, Achim A1 - Albiez, Matthias A1 - Pasternak, Hartmut A1 - Ummenhofer, Thomas A1 - Feldmann, Markus ED - Juozapaitis, Algirdas ED - Daniūnas, Alfonsas ED - Juknevičius, Linas T1 - Strengthening of steel structures with fatigue cracks using adhesively bonded non-prestressed and prestressed CFRP lamellas T2 - The 13th International Conference MODERN BUILDING MATERIALS, STRUCTURES AND TECHNIQUES, 16–17 May 2019, Vilnius, Lithuania Vilnius Gediminas Technical University N2 - In comparison to classic strengthening methods of fatigue-damaged steel structures, adhesively bonded CFRP lamellas show several advantages. Compared to bolted reinforcement measures and the drilling of the crack tip, crosssectional weakening is avoided. Heat-induced, negatively acting residual stresses and distortions, usually occurring during repair welding, can also be excluded. Therefore, the effectiveness of adhesively bonded CFRP lamellas to enhance the remaining lifetime of fatigue damaged steel structures is examined in a German research project. Selected results are presented in this paper. To characterize the steel, CFRP and adhesive materials, different tests on small scale specimens are carried out. With the help of fatigue tests on CT-samples the remaining fatigue lifetimes of specimens strengthened with adhesively bonded CFRP lamellas is compared to the remaining lifetimes of specimens strengthened by established methods such as drilling the crack tip and repair welding. Based on the evaluation of the crack propagation after the rehabilitation measures, the great potential of adhesively bonded CFRP reinforcements can be deduced. By prestressing the lamellas, the remaining lifetime can generally be increased further. The combination of adhesively bonded CFRP lamellas together with established rehabilitation methods shows a particularly high positive influence on the remaining lifetime of the CT-specimens. Y1 - 2019 SN - 978-609-476-197-3 U6 - https://doi.org/10.3846/mbmst.2019.068 SN - 2029-9915 SP - 252 EP - 260 ER -