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采用ф74 mm分离式霍普金森压杆(Split Hopkinson Pressure Bar,简称SHPB)试验装置对30块高温后的钢管活性粉末混凝土(Reactive Powder Concrete-Filled Steel Tube,简称钢管RPC)进行了不同应变率的冲击压缩试验,得到了高温后钢管RPC的动态应力-应变关系和破坏形态,提出了高温后钢管RPC动态峰值应力和峰值应变预估方法。结果表明,高温后钢管RPC具有明显的应变率效应,经历高温作用后的钢管RPC仍保持较高的强度,较好的延性和整体性。含钢率对钢管RPC动力性能有显著影响,初始弹性刚度和峰值应力随含钢率提高而明显增大。理论计算结果与试验结果吻合良好,能够较好预测高温后钢管RPC的动态峰值应力和峰值应变。
Thirty (74) mm split Split Hopkinson Pressure Bar (SHPB) test rigs were used to investigate the thermal behavior of 30 Reactive Powder Concrete-Filled Steel Tubes (RPCs) under different strain rates Impact compression test, the dynamic stress-strain relationship and failure mode of RPC after high temperature are obtained, and the dynamic peak stress and peak strain prediction method of RPC after high temperature are proposed. The results show that the RPC has obvious strain rate effect after high temperature, and the RPC still maintains high strength, good ductility and integrity after high temperature. Steel content has a significant impact on RPC dynamic performance of steel, the initial elastic stiffness and peak stress with the steel content increased significantly increased. The theoretical calculation results are in good agreement with the experimental results, which can predict the dynamic peak stress and peak strain of RPC after high temperature.