Experiments on reactive powder concrete-filled steel tube (RPC-FST) specimens after exposure to high temperature were performed by using a split Hopkinson pressure bar (SHPB) apparatus,and the influences of strain rate effects and temperature effects on the dynamic behaviors of RPC-FST were investigated.Test results show that the RPC-FST specimens after exposure to high temperature have excellent impact-resistance,ductility and integrity.The strain rate effects of the RPC-FST specimens are weaker than those of the RPC specimens under impact loading.The peak stress of the RPCFST specimens increases as the temperature increases,and the deformation capability and impact-resistance increase.The dynamic increase factor (DIF) increases as the temperature increases.It means that the strain rate effects of RPC-FST become more obvious after exposure to high temperature.%采用霍普金森压杆装置对高温后钢管活性粉末混凝土(reactive powder concrete-filled steel tube,RPC-FST)进行冲击压缩实验,分析了应变率效应及温度效应对试件动态力学性能的影响.结果表明:高温(200、300℃)后RPC-FST仍具有较好的抗冲击能力、延性和完整性;冲击荷载作用下,RPC-FST的应变率效应明显弱于RPC的应变率效应;随着过火温度的提高,RPC-FST的峰值应力逐渐增大,变形能力增强,抗冲击能力提高.动力提高系数随过火温度的提高而增大,说明高温后RPC-FST的应变率效应更显著.
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