Theoretical and experimental study on progressive collapse resistance of concrete filled steel tubular column-composite beam frame under failure condition of middle column

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Journal of Vibration and Shock ›› 2020, Vol. 39 ›› Issue (3) : 76-87.

XUAN Wei1,2，WANG Lai2, LIU Changjiang1，XING Guoqi1, YANG Ning3

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Abstract

In order to study the collapse resistance of concrete filled steel tubular column-composite beam under failure condition of middle column, based on the analysis of resistance mechanism and influencing factors of concrete filled steel tubular column-composite beam, In this paper, an anti-collapse analysis model of concrete-filled square steel tubular column-composite beam was established.The model takes into account the restraint effect of beam end-column, the difference of bending stiffness of composite beam under the action of positive and negative moment and the bond slip effect between floor and steel beam.The resistance-deformation calculation formula of the model was deduced.In this paper, a 2-span 1-scale concrete-filled square steel tubular column-composite beam frame specimen was designed and the static loading test was carried out.The failure mode, load transfer mechanism and main resistance mechanism of the residual structure after the failure of the middle column were analyzed.The test results showed that the resistance of the structure in the process of collapse has experienced the transformation from the beam mechanism to the catenary mechanism, in which the compression arch mechanism and catenary mechanism can effectively improve the collapse bearing capacity of the structure.Finally, based on the comparative analysis of the theoretical and experimental results, the correction method of the theoretical formula was put forward.

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concrete filled square steel tube column-composite beam frame / demolition member method / collapse test / theoretical analysis

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XUAN Wei1,2，WANG Lai2, LIU Changjiang1，XING Guoqi1, YANG Ning3. Theoretical and experimental study on progressive collapse resistance of concrete filled steel tubular column-composite beam frame under failure condition of middle column[J]. Journal of Vibration and Shock, 2020, 39(3): 76-87

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