Abstract
The progressive collapse of steel frame structures under the blast load was investigated using LS-DYNA. The multi-material Eulerian and Lagrangian coupling algorithm was adopted. A fluid-structure coupling finite element model was established which consists of Lagrange element for simulating steel frame structures and concrete ground, multiple ALE element for simulating air and TNT explosive material. Numerical simulations of the blast pressure wave propagation, structural dynamic responses and deformation, and progressive collapse of a five-story steel frame structure in the event of an explosion near above ground were performed. The numerical analysis showed that the Lagrangian and Eulerian coupling algorithm gave good simulations of the shock wave propagation in the mediums and blast load effects on the structure. The columns subjected to blast load may collapse by shear yielding rather than by flexural deformation. The columns and joints of steel beam to column in the front steel frame structure generated enormous plastic deformation subjected to intensive blast waves, and columns lost carrying capacity, subsequently leading to the collapse of the whole structure. The approach coupling influence between structural deformation and fluid load well simulated the progressive collapse process of structures, and provided an effective tool for analyzing the collapse mechanism of the steel frame structure under blast load.
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Supported by National Natural Science Foundation of China (No.50608026).
ZHANG Xiuhua, female, born in 1970, Dr, associate Prof.
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Zhang, X., Duan, Z. & Zhang, C. Numerical simulation of dynamic response and collapse for steel frame structures subjected to blast load. Trans. Tianjin Univ. 14 (Suppl 1), 523–529 (2008). https://doi.org/10.1007/s12209-008-0090-y
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DOI: https://doi.org/10.1007/s12209-008-0090-y