Experimental study on blast-resistant capacities of RPC filled steel tubular columns after exposure to fire

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Journal of Vibration and Shock ›› 2016, Vol. 35 ›› Issue (13) : 1-7.

Zou Huihui1, Chen Wanxiang1,2, Guo Zhikun1, Jiang Meng1, Xiang Hengbo1

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Abstract

To investigate the blast-resistant capacities of RPC Filled Steel Tubular Column (RPC-FSTC) after exposure to fire, the time history curves of reflected overpressure of blast load and the displacements and strains of specimen are obtained by the field explosion experiments on 4 large scale RPC-FSTC specimens. The influences of fire duration times and scale distances of charge on the behaviors of RPC-FSTC are also discussed. It is indicated that the RPC-FSTC keeps excellent blast-resistant capacity after exposure to fire. RPC core column can still be effectively confined by steel tube under explosion load after the RPC-FSTC exposure to fire, the blast-resistant capacity of RPC-FSTC is decreased as fire duration time increased. The RPC-FSTC without fire exposure keeps elastic state with scale distance of 0.58m/kg1/3. RPC-FSTC with fire duration time of 60 min still keeps good deformable capacity and shear resistance, but the flexure failure tends to flexure-shear failure as scale distance of 0.58m/kg1/3 decreases to scale distance of 0.48m/kg1/3. The deformable capacity of RPC-FSTC with fire duration time of 105 min is decreased greatly. Obvious plastic hinge is observed at the mid-span of RPC-FSTC with scale distance of 0.58m/kg1/3, and the maximum displacement and residual displacement of mid-span are increased by 0.4 times and 1.6 times respectively than that of RPC-FSTC with fire duration time of 60 min. It is indicated that the fire duration time has great influence on the blast-resistant capacity of RPC filled steel tubular columns after exposure to fire.

Key words

RPC filled steel tubular column / blast-resistant experiment / after fire / fire duration time / scale distance

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Zou Huihui1, Chen Wanxiang1,2, Guo Zhikun1, Jiang Meng1, Xiang Hengbo1. Experimental study on blast-resistant capacities of RPC filled steel tubular columns after exposure to fire[J]. Journal of Vibration and Shock, 2016, 35(13): 1-7

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