Preliminary analysis of robustness of progressive collapse of composite frame with CFST column

Abstract

Abstract: In order to study the vertical progressive collapse vulnerability of CFST frame structures, an 8-story CFST frame with 4×4 span was analyzed. The finite element software ABAQUS and the Pushdown analysis method were used to simulate the original structure and the remaining structure after the removal of each bottom column. Based on the two improved vulnerability analysis methods considering the component importance, the importance coefficients of structural components were calculated separately, and the robustness coefficients of the structure under double-column failure conditions were calculated to analyze the vertical robustness of this kind of structure. The results show that the calculation results of the two methods are similar, and the change trend of the component importance coefficient is the same The increase in external load is negatively correlated with the structural robustness. The corner column is more important than the side column and center column. When corner posts and side posts fail at the same time, the chance of the structure collapsing is greatly increased. The alternate path method can be choosed in low-fragility designation for components with large importance coefficient.

Key words: concrete filled steel tube, progressive collapse, component importance

CLC Number:

TU398
TU972

SHI Yan-li, WANG Xue, WANG Jing-xuan. Preliminary analysis of robustness of progressive collapse of composite frame with CFST column[J]. Journal of Lanzhou University of Technology, 2022, 48(5): 120-125.

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