论文部分内容阅读
采用φ74 mm分离式霍普金森压杆(Split Hopkinson Pressure Bar,SHPB)装置对30块高温后的钢管活性粉末混凝土(Reactive Powder Concrete-Filled Steel Tube,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。利用ANSYS软件模拟了钢管RPC截面温度场分布,然后根据加权平均法得到高温后钢管RPC的轴心抗压强度代表值,最后采用LS-DYNA软件模拟了高温后钢管RPC动态力学行为。结果表明,高温200~300℃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,变形能力有所增强。基于*MAT_CONCRETE_DAMAGE_REL3模型的数值模拟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。
Tensile compression tests of 30 high-temperature Reactive Powder Concrete-Filled Steel (RPC) pipes under different strain rates were carried out using a split-Hopkinson Pressure Bar (SHPB) The dynamic stress-strain relationship and failure mode of RPC after high temperature were obtained. The distribution of temperature field of RPC was simulated by ANSYS software. Then the RPC representative value of RPC after high temperature was obtained by weighted average method. Finally, LS-DYNA software was used to simulate the dynamic behavior of RPC after high temperature. The results show that the RPC has obvious strain rate effect after high temperature of 200 ~ 300 ℃. The steel pipe RPC still retains high strength, good ductility and integrity after high temperature. The deformation ability is enhanced. The numerical simulation based on the * MAT_CONCRETE_DAMAGE_REL3 model is in good agreement with the experimental results, which can predict the dynamic peak stress of RPC after high temperature.