The alternate load path method for progressive collapse analysis ignores the cause and mechanism of member failure and its influence on the dynamic effect of the remaining structures. It must assume the location of member failure, which is unsuitable for grid structures with many members. In this paper, by using the double broken line follow-up strengthening model and the proposed VUMAT material constitutive model, taking the member instability and material failure as the member failure criteria and considering the geometric nonlinearity and material nonlinearity, the instantaneous member removal method for deleting the failure member in real time was proposed. On this basis, nonlinear dynamic analysis for a three-layer space truss was used to compare the effects of different member failure criteria on the structural responses, such as the member failure sequence and the occurrence time of the continuous structural collapse. The results show that when considering the instability of members, the initial member failure and the final progressive collapse occur earlier than when using the material failure criterion, which is more similar to the actual situation. Furthermore, the proposed VUMAT material constitutive model can apply to study the progressive collapse behavior of space truss structures.
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Translated from Problemy Mitsnosti, No. 3, p. 125, May – June, 2023.
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Zhao, B.Y., Zhang, X.T., Zhang, H.D. et al. Study on Progressive Collapse of 532 m-Long Three-Layer Truss Hangar Based on VUMAT Subroutine. Strength Mater 55, 617–628 (2023). https://doi.org/10.1007/s11223-023-00553-0
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DOI: https://doi.org/10.1007/s11223-023-00553-0