Progressive collapse analysis of concrete-filled steel tubular frames with semi-rigid connections |
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| Authors: | Man Xu Sumei Zhang Lanhui Guo and Yuyin Wang |
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| Institution: | (1) Faculty of Civil Engineering, Shahid Rajaee Teacher Training University, Tehran, Iran;(2) Islamic Azad University - Science and Research Branch, Tehran, Iran;(3) Civil Engineering Department, Yeditepe University, Atasehir 34755 Istanbul, Turkey |
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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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| Keywords: | substructure model concrete-filled steel tubular frame semi-rigid connection alternate path method dynamic analysis |
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