Tests for dynamic collapse performance of steel-concrete composite frame substructures

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Journal of Vibration and Shock ›› 2020, Vol. 39 ›› Issue (13) : 36-42.

YANG Tao1,2,3, ZHAO Kai1, PENG Xiuning1,2

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Abstract

To investigate the dynamic collapse performance of steel-concrete composite frame structures after a middle column was removed, two one-third reduced scaled composite frame substructures were tested by removing a column. Experimental results showed that when additional weight of 30 kN and 60 kN were hung on the composite frame beams respectively, the maximum dynamic displacement at the middle columns of the two specimens was at least 1.34 times of the static displacement after the vibration stopped. The residual structures were still working in the elastic stage after the removal of the middle column and the damp ratios were both minor. The composite frame beams using studs shear connectors presented larger acceleration response and dynamic displacement response. While the frame substructure with perforated plate shear connectors used in the composite beams had better integral rigidity and was less affected by the impact of the dynamic load comparing with the former. The collapse load dynamic increase factors (DIF) of the composite frames appeared two-stage changing rules with the increase of vertical displacement at the middle column. And then, the calculation model of collapse load DIF applying to composite frames was presented based on the experimental investigation. The research results of this paper could provide references for collapse analysis of steel-concrete composite frame structures.

Key words

steel-concrete composite beam；progressive collapse / dynamic response / shear connector / dynamic increase factor.

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YANG Tao1,2,3, ZHAO Kai1, PENG Xiuning1,2. Tests for dynamic collapse performance of steel-concrete composite frame substructures[J]. Journal of Vibration and Shock, 2020, 39(13): 36-42

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