火灾后钢管RPC柱抗爆性能试验研究

邹慧辉1,陈万祥1,2,郭志昆1,姜 猛1,相恒波1

振动与冲击 ›› 2016, Vol. 35 ›› Issue (13) : 1-7.

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振动与冲击 ›› 2016, Vol. 35 ›› Issue (13) : 1-7.
论文

火灾后钢管RPC柱抗爆性能试验研究

  • 邹慧辉1,陈万祥1,2 ,郭志昆1,姜  猛1,相恒波1
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Experimental study on blast-resistant capacities of RPC filled steel tubular columns after exposure to fire

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

为研究钢管活性粉末混凝土(钢管RPC)柱火灾后的抗爆性能。通过4根大比例钢管RPC柱试件的野外爆炸试验,得到了冲击波反射压力和钢管RPC柱的位移、应变时程曲线,分析了不同受火时间和比例距离对火灾后钢管RPC柱抗爆性能的影响。结果表明:钢管RPC柱具有良好的抗爆性能,受火后的钢管RPC柱在爆炸荷载作用下钢管仍能有效约束RPC,但随着受火时间的增加钢管RPC柱的抗爆能力减弱。未受火的钢管RPC柱在比例距离为0.58m/kg1/3的爆炸荷载作用下基本处于弹性状态;受火60min的钢管RPC柱仍具有较好的变形性能和抗剪能力,但当比例距离由0.58m/kg1/3减小到0.48m/kg1/3时,试件出现由弯曲破坏过渡到弯剪破坏的趋势;受火105min的钢管RPC柱变形性能显著下降,在比例距离为0.58m/kg1/3的爆炸荷载作用下跨中处出现明显的塑性铰,跨中最大位移和残余位移分别比受火60min的工况增加0.4倍和1.6倍,说明受火时间对火灾后钢管RPC柱的抗爆性能有较大影响。

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.

关键词

钢管RPC柱 / 抗爆试验 / 火灾后 / 受火时间 / 比例距离

Key words

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

引用本文

导出引用
邹慧辉1,陈万祥1,2,郭志昆1,姜 猛1,相恒波1. 火灾后钢管RPC柱抗爆性能试验研究[J]. 振动与冲击, 2016, 35(13): 1-7
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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