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Progressive collapse analysis of concrete-filled steel tubular frames with semi-rigid connections

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Abstract

A 9-story concrete-filled steel tubular frame model is used to analyze the response of joints due to sudden column loss. Three different models are developed and compared to study the efficiency and feasibility of simulation, which include substructure model, beam element model and solid element model. The comparison results show that the substructure model has a satisfying capability, calculation efficiency and accuracy to predict the concerned joints as well as the overall framework. Based on the substructure model and a kind of semi-rigid connection for concrete-filled square hollow section steel column proposed in this paper, the nonlinear dynamic analyses are conducted by the alternate path method. It is found that the removal of the ground inner column brings high-level joint moments and comparatively low-level axial tension forces. The initial stiffness and transmitted ultimate moment of the semi-rigid connection are the main factors that influence the frame behavior, and their lower limit should be guaranteed to resist collapse. Reduced ultimate moment results in drastic displacement and axial force development, which may bring progressive collapse. The higher initial stiffness ensures that the structure has a stronger capacity to resist progressive collapse.

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Authors and Affiliations

  1. School of Civil Engineering, Harbin Institute of Technology, Harbin, 150090, China

    Man Xu  (徐 嫚), Sumei Zhang  (张素梅), Lanhui Guo  (郭兰慧) & Yuyin Wang  (王玉银)

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  1. Man Xu  (徐 嫚)
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  2. Sumei Zhang  (张素梅)
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  3. Lanhui Guo  (郭兰慧)
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  4. Yuyin Wang  (王玉银)
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Corresponding author

Correspondence to Man Xu  (徐 嫚).

Additional information

Supported by National Natural Science Foundation of China (No. 50878066), Natural Science Foundation of Heilongjiang Province (No. ZJG0701) and Heilongjiang Postdoctoral Science Foundation.

XU Man, born in 1982, female, doctorate student.

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Xu, M., Zhang, S., Guo, L. et al. Progressive collapse analysis of concrete-filled steel tubular frames with semi-rigid connections. Trans. Tianjin Univ. 17, 461–468 (2011). https://doi.org/10.1007/s12209-011-1672-7

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  • DOI: https://doi.org/10.1007/s12209-011-1672-7

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