@misc{CiupackPasternakGessleretal., author = {Ciupack, Yvonne and Pasternak, Hartmut and Geßler, Achim and Feldmann, Markus and Kasper, Yann and Albiez, Matthias and Ummenhofer, Thomas}, title = {Repair of Fatigue Cracked CT-specimens Using Adhesively Bonded CFRP Lamellas}, series = {27th Annual International Conference on Composites / Nano Engineering ICCE-27}, journal = {27th Annual International Conference on Composites / Nano Engineering ICCE-27}, pages = {2}, language = {en} } @misc{CiupackPasternak, author = {Ciupack, Yvonne and Pasternak, Hartmut}, title = {Some Remarks about the New Generation of prEN 1993-1-1}, series = {27th Annual International Conference on Composites / Nano Engineering ICCE-27}, journal = {27th Annual International Conference on Composites / Nano Engineering ICCE-27}, pages = {3}, language = {en} } @misc{DoynovStapelfeldMichailovetal., author = {Doynov, Nikolay and Stapelfeld, Christoph and Michailov, Vesselin and Pasternak, Hartmut and Launert, Benjamin}, title = {Distortion analysis of large scaled welded structures}, series = {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}, journal = {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}, editor = {Sommitsch, Christof and Enzinger, Norbert and Mayr, Peter}, publisher = {Verlag der Technischen Universit{\"a}t Graz}, address = {Graz}, isbn = {978-3-85125-615-4}, doi = {10.3217/978-3-85125-615-4}, pages = {254 -- 280}, abstract = {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.}, language = {en} } @misc{PasternakKrausche, author = {Pasternak, Hartmut and Krausche, Thomas}, title = {Details and assembly of two cladded double curved cable net roofs}, series = {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}, journal = {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}, editor = {Zingoni, Alphose}, publisher = {Taylor \& Francis Group}, address = {London}, isbn = {978-1-138-38696-9}, pages = {896 -- 901}, language = {en} } @misc{LaunertLiPasternak, author = {Launert, Benjamin and Li, Zheng and Pasternak, Hartmut}, title = {Development of a new method for the direct numerical consideration of welding effects in the component design of welded plate girders}, series = {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}, journal = {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}, editor = {Zingoni, Alphose}, publisher = {Taylor \& Francis Group}, address = {London}, isbn = {978-1-138-38696-9}, pages = {1143 -- 1147}, language = {en} } @misc{LiPasternakCiupack, author = {Li, Zheng and Pasternak, Hartmut and Ciupack, Yvonne}, title = {Artificial neural network prediction of bearing capacity of welded columns based on simplified welding simulations}, series = {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}, journal = {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}, editor = {Zingoni, Alphose}, publisher = {Taylor \& Francis Group}, address = {London}, isbn = {978-1-138-38696-9}, pages = {1219 -- 1223}, language = {en} } @misc{KasperAlbiezUmmenhoferetal., author = {Kasper, Yann and Albiez, Matthias and Ummenhofer, Thomas and Ciupack, Yvonne and Ledecky, Lukas and Pasternak, Hartmut and Geßler, Achim and Feldmann, Markus}, title = {Application of carbon fibre composite materials for the rehabilitation of fatigue damaged steel structures}, series = {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}, journal = {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}, editor = {Zingoni, Alphose}, publisher = {Taylor \& Francis Group}, address = {London}, isbn = {978-1-138-38696-9}, pages = {2148 -- 2153}, language = {en} } @misc{StapelfeldLaunertPasternaketal., author = {Stapelfeld, Christoph and Launert, Benjamin and Pasternak, Hartmut and Doynov, Nikolay and Michailov, Vesselin}, title = {Improve load capacity calculations by considering realistic imperfections induced by welding for plates and shells}, series = {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}, journal = {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}, publisher = {CRC Press}, address = {Boca Raton}, isbn = {978-0-367-33503-8}, pages = {1059 -- 1067}, language = {en} } @misc{ShoushtarianMofradShlychkovaCiupacketal., author = {Shoushtarian Mofrad, Ashkan and Shlychkova, Darita and Ciupack, Yvonne and Pasternak, Hartmut}, title = {FE Modelling of Sandwich Panels with Screwed Joint at Elevated Temperatures}, series = {XVIII ANNIVERSARY INTERNATIONAL SCIENTIFIC CONFERENCE BY CONSTRUCTION AND ARCHITECTURE VSU'2018, At Sofia, Bulgaria}, journal = {XVIII ANNIVERSARY INTERNATIONAL SCIENTIFIC CONFERENCE BY CONSTRUCTION AND ARCHITECTURE VSU'2018, At Sofia, Bulgaria}, pages = {6}, abstract = {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.}, language = {en} } @misc{ShlychkovaPasternak, author = {Shlychkova, Darita and Pasternak, Hartmut}, title = {Numerical analysis and laboratory experiments of lightweight structured sandwich beams made of steel}, series = {Proceedings VII International Scientific Conference VSU 2017, 8-9 Juni 2017, Sofia, Bulgaria}, volume = {Volume 1}, journal = {Proceedings VII International Scientific Conference VSU 2017, 8-9 Juni 2017, Sofia, Bulgaria}, address = {Sofia, Bulgaria}, issn = {1314-071X}, pages = {252 -- 260}, abstract = {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.}, language = {en} } @misc{PasternakLiStapelfeldetal., author = {Pasternak, Hartmut and Li, Zheng and Stapelfeld, Christoph and J{\"a}ger-Ca{\~n}{\´a}s, Andreas and Launert, Benjamin}, title = {Considering realistic weld imperfections in load bearing capacity calculations of ring-stiffened shells using the analytical numerical hybrid model}, series = {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}, journal = {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}, edition = {1st Edition}, publisher = {CRC Press}, address = {London}, isbn = {978-0-429-32024-8}, doi = {10.1201/9780429320248}, pages = {882 -- 889}, language = {en} } @misc{JaegerCanasLiPasternak, author = {J{\"a}ger-Ca{\~n}{\´a}s, Andreas and Li, Zheng and Pasternak, Hartmut}, title = {Axial buckling behavior of welded ring-stiffened shells}, series = {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}, journal = {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}, edition = {1st Edition}, publisher = {CRC Press}, address = {London}, isbn = {978-0-429-32024-8}, doi = {10.1201/9780429320248}, pages = {556 -- 563}, language = {en} } @misc{LoebjinskiRugPasternak, author = {Loebjinski, Maria and Rug, Wolfgang and Pasternak, Hartmut}, title = {The influence of an improved strength grading in situ on modelling timber strength properties}, series = {Proceedings of the International Conference on Structural Health Assessment of Timber Structures, SHATiS´2019}, journal = {Proceedings of the International Conference on Structural Health Assessment of Timber Structures, SHATiS´2019}, publisher = {Universidade do Minho Departamento de Engenharia Civi}, address = {Guimar{\~a}es, Portugal}, isbn = {978-989-54496-2-0}, pages = {619 -- 628}, language = {en} } @misc{LoebjinskiLinkeRugetal., author = {Loebjinski, Maria and Linke, Gunter and Rug, Wolfgang and Pasternak, Hartmut}, title = {Redevelopment of a wooden roof construction under preservation order}, series = {Proceedings of the International Conference on Structural Health Assessment of Timber Structures, SHATiS´2019}, journal = {Proceedings of the International Conference on Structural Health Assessment of Timber Structures, SHATiS´2019}, publisher = {Universidade do Minho Departamento de Engenharia Civi}, address = {Guimar{\~a}es, Portugal}, isbn = {978-989-54496-2-0}, pages = {912 -- 921}, language = {en} } @misc{LoebjinskiLinkeRugetal., author = {Loebjinski, Maria and Linke, Gunter and Rug, Wolfgang and Pasternak, Hartmut}, title = {Evaluation of existing timber structures - Current standards for the assessment and evaluation in Germany and Europe}, series = {Proceedings of the International Conference on Structural Health Assessment of Timber Structures, SHATiS´2019}, journal = {Proceedings of the International Conference on Structural Health Assessment of Timber Structures, SHATiS´2019}, publisher = {Universidade do Minho Departamento de Engenharia Civi}, address = {Guimar{\~a}es, Portugal}, isbn = {978-989-54496-2-0}, pages = {884 -- 893}, language = {en} } @misc{CiupackLedeckyKasperetal., author = {Ciupack, Yvonne and Ledecky, Lukas and Kasper, Yann and Geßler, Achim and Albiez, Matthias and Pasternak, Hartmut and Ummenhofer, Thomas and Feldmann, Markus}, title = {Strengthening of steel structures with fatigue cracks using adhesively bonded non-prestressed and prestressed CFRP lamellas}, series = {The 13th International Conference MODERN BUILDING MATERIALS, STRUCTURES AND TECHNIQUES, 16-17 May 2019, Vilnius, Lithuania Vilnius Gediminas Technical University}, journal = {The 13th International Conference MODERN BUILDING MATERIALS, STRUCTURES AND TECHNIQUES, 16-17 May 2019, Vilnius, Lithuania Vilnius Gediminas Technical University}, editor = {Juozapaitis, Algirdas and Daniūnas, Alfonsas and Juknevičius, Linas}, isbn = {978-609-476-197-3}, issn = {2029-9915}, doi = {10.3846/mbmst.2019.068}, pages = {252 -- 260}, abstract = {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.}, language = {en} } @misc{SternsdorffCiupackYilmazetal., author = {Sternsdorff, Florian and Ciupack, Yvonne and Yilmaz, Emre Mehmet and Pasternak, Hartmut and Vayas, Ioannis}, title = {Investigations on beam-to-column connections reinforced with adhesively bonded CFRP lamellas}, series = {7th International Conference Civil Engineering - Science and Practice (GNP), Kolašin, 10.-14. March 2020, Book of abstracts}, journal = {7th International Conference Civil Engineering - Science and Practice (GNP), Kolašin, 10.-14. March 2020, Book of abstracts}, pages = {8}, abstract = {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.}, language = {en} } @misc{PasternakKrausche, author = {Pasternak, Hartmut and Krausche, Thomas}, title = {Design, Construction and Assembly of two Membrane-Cladded Double-Curved Net Roofs}, series = {7th International Conference Civil Engineering - Science and Practice (GNP), Kolašin, 10-14 March 2020, Book of abstracts}, journal = {7th International Conference Civil Engineering - Science and Practice (GNP), Kolašin, 10-14 March 2020, Book of abstracts}, pages = {8}, language = {en} } @misc{ShoushtarianMofradShlychkovaCiupacketal., author = {Shoushtarian Mofrad, Ashkan and Shlychkova, Darita and Ciupack, Yvonne and Pasternak, Hartmut}, title = {Study of Bending, Translational and Torsional Stiffness of Sandwich Panels in Fire}, series = {7th International Conference Civil Engineering - Science and Practice (GNP), Kolašin, 10-14 March 2020, Book of abstracts}, journal = {7th International Conference Civil Engineering - Science and Practice (GNP), Kolašin, 10-14 March 2020, Book of abstracts}, pages = {8}, language = {en} } @misc{PasternakCiupack, author = {Pasternak, Hartmut and Ciupack, Yvonne}, title = {Use of CFRP for the Rehabilitation of Fatigue Damaged Steel Structures - Only a Nice Idea?}, series = {XX International Scientific Conference VSU'2020 on Construction and Architecture Book of Abstracts}, journal = {XX International Scientific Conference VSU'2020 on Construction and Architecture Book of Abstracts}, editor = {Georgiev, Vanyo and Stoynova, Iliana}, issn = {1314-071X}, pages = {9}, language = {en} } @misc{WangEulerPasternaketal., author = {Wang, Jian and Euler, Mathias and Pasternak, Hartmut and Li, Zheng and Krausche, Thomas and Launert, Benjamin}, title = {Bending capacity of single and double-sided welded I-section girders: Part 1: Experimental investigations}, series = {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}, journal = {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}, publisher = {CRC Press}, address = {Boca Raton}, isbn = {978-1-00-334845-0}, doi = {10.1201/9781003348443-159}, pages = {975 -- 980}, abstract = {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.}, language = {en} } @misc{WangLiPasternaketal., author = {Wang, Jian and Li, Zheng and Pasternak, Hartmut and Euler, Mathias}, title = {Shear Buckling Behavior of Tapered Steel Plate Girders with Sinusoidally Corrugated Webs}, series = {ce/papers}, volume = {6}, journal = {ce/papers}, number = {3-4}, issn = {2509-7075}, doi = {10.1002/cepa.2534}, pages = {1787 -- 1792}, language = {en} }