@inproceedings{LiPasternak, author = {Li, Zheng and Pasternak, Hartmut}, title = {Development of a stochastic material model at constant stress distribution in steel construction}, series = {16th International Scientific Conference VSU 2016, Sofia, 2016, vol. 1}, booktitle = {16th International Scientific Conference VSU 2016, Sofia, 2016, vol. 1}, publisher = {VSU}, address = {Sofia}, pages = {193 -- 198}, abstract = {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.}, language = {en} } @inproceedings{LiPasternak, author = {Li, Zheng and Pasternak, Hartmut}, title = {Reliability analysis of size effect on flexural members with stochastic finite element method}, series = {12th International Conference on Structural Safety \& Reliability, Vienna, Austria, 6-10 August 2017}, booktitle = {12th International Conference on Structural Safety \& Reliability, Vienna, Austria, 6-10 August 2017}, editor = {Bucher, Christian and Ellingwood, Bruce R. and Frangopol, Dan M.}, publisher = {TU-MV Media Verlag}, address = {Vienna}, isbn = {978-3-903024-28-1}, language = {en} } @misc{LiLaunertPasternak, author = {Li, Zheng and Launert, Benjamin and Pasternak, Hartmut}, title = {Application of the stochastic finite element method in welding simulation}, series = {Welding in the World}, volume = {62}, journal = {Welding in the World}, number = {5}, issn = {0043-2288}, doi = {10.1007/s40194-018-0596-4}, pages = {905 -- 912}, abstract = {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.}, language = {en} } @misc{WangLiEuler, author = {Wang, Jian and Li, Zheng and Euler, Mathias}, title = {Investigation on shear buckling of steel welded I-section beams with reinforced web openings}, series = {ce/papers}, volume = {6}, journal = {ce/papers}, number = {3-4}, doi = {10.1002/cepa.2361}, pages = {1754 -- 1760}, language = {en} } @inproceedings{LiPasternakPartov, author = {Li, Zheng and Pasternak, Hartmut and Partov, Doncho}, title = {Influence of statistical size effect in steel on structural safety}, series = {Proceedings of 16th International Conference on New Trends in Statics and Dynamics of Buildings}, booktitle = {Proceedings of 16th International Conference on New Trends in Statics and Dynamics of Buildings}, editor = {Jendželovsk{\´y}, Norbert and Grmanov{\´a}, Alžbeta}, publisher = {Slovak University of Technology}, address = {Bratislava}, isbn = {978-80-227-4845-2}, abstract = {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.}, language = {en} } @misc{WangLiPasternaketal., author = {Wang, Jian and Li, Zheng and Pasternak, Hartmut and Euler, Mathias}, title = {Querkrafttragf{\"a}higkeit von Wellstegtr{\"a}gern mit versteiften quadratischen Steg{\"o}ffnungen}, series = {Bauingenieur}, volume = {98}, journal = {Bauingenieur}, number = {11}, issn = {0005-6650}, doi = {10.37544/0005-6650-2023-11-31}, pages = {343 -- 353}, abstract = {Die Ergebnisse aus drei Traglastversuchen und einer umfangreichen numerischen Parameterstudie (FE-Berechnungen) zum Tragverhalten von Wellstegtr{\"a}gern mit quadratischen Steg{\"o}ffnungen werden vorgestellt. Es werden versteifte Steg{\"o}ffnungen mit einem umlaufenden Versteifungskranz betrachtet. In der Parameterstudie werden die Einfl{\"u}sse der Steg{\"o}ffnungsgeometrie, der Tr{\"a}gergeometrie und der Position der Steg{\"o}ffnung auf die Querkrafttragf{\"a}higkeit der Wellstegtr{\"a}ger untersucht.}, language = {de} } @misc{LiuDongZhangetal., author = {Liu, Wen-Cai and Dong, Jie and Zhang, Ping and Zheng, Xing-Wei and Ding, Wen-Jiang and Li, De-Hui and Korsunsky, Alexander M.}, title = {Smooth and notched fatigue performance of aging treated and shot peened ZK60 magnesium alloy}, series = {Journal of materials research}, volume = {25}, journal = {Journal of materials research}, number = {7}, issn = {2044-5326}, pages = {1375 -- 1387}, language = {en} } @misc{LiPasternak, author = {Li, Zheng and Pasternak, Hartmut}, title = {Statistischer Maßstabseffekt und seine Bedeutung f{\"u}r die Zuverl{\"a}ssigkeit im Stahlbau,Teil 1 - Modell und Versuch}, series = {Bautechnik}, volume = {97}, journal = {Bautechnik}, number = {11}, doi = {10.1002/bate.202000030}, pages = {766 -- 772}, language = {de} } @misc{LiLoebjinskiPasternak, author = {Li, Zheng and Loebjinski, Maria and Pasternak, Hartmut}, title = {Statistischer Maßstabseffekt und seine Bedeutung f{\"u}r die Zuverl{\"a}ssigkeit im Stahlbau, Teil 2- Zuverl{\"a}ssigkeitsanalyse}, series = {Bautechnik}, volume = {97}, journal = {Bautechnik}, number = {11}, doi = {10.1002/bate.202000031}, pages = {773 -- 779}, language = {de} } @misc{LiPasternakRobra, author = {Li, Zheng and Pasternak, Hartmut and Robra, J{\"o}rgen}, title = {Tragverhalten von Wellstegtr{\"a}gern mit kreisf{\"o}rmigem {\"O}ffnungskranz}, series = {Bauingenieur}, volume = {96}, journal = {Bauingenieur}, number = {4}, issn = {0005-6650}, doi = {10.37544/0005-6650-2021-04-50}, pages = {114 -- 120}, language = {de} }