高温后钢管RPC动态力学性能及数值模拟研究

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振动与冲击 ›› 2017, Vol. 36 ›› Issue (10) : 159-167.

论文

郭伟东，?陈万祥，张涛，梁文光

作者信息 +

Test and numerical simulation of dynamic behavior of Reactive Powder Concrete-Filled Steel Tube after exposure to high temperatures

GuoWeidong, Chen Wanxiang, Zhang Tao,Liang Wenguang

Author information +

文章历史 +

摘要

采用ø74mm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。

Abstract

Dynamic behaviors of a group of 30 Reactive Powder Concrete-Filled Steel Tube (RPC-FST) specimens after exposure to high temperature under different impact loading are performed by using ø74 mm-Split Hopkinson Pressure Bar (SHPB).Dynamic stress-strain relationships and failure modes ofRPC-FSTspecimensare derived experimentally. The representative cylinder compressive strengths are obtained based on the temperature field simulated by using ANSYS code, and the dynamic behaviors of RPC-FST after exposure to high temperature are further simulated by using LS-DYNA code. Results show thatobvious strain rate effects can be observed in RPC-FST specimensunder impact loading, and RPC-FST still keepremarkable compressive strength, good ductility and integrity after exposure to high temperature. Furthermore, the deformation capabilities of RPC-FST after exposure to high temperature are increased. Simulated results based on *MAT_CONCRETE_DAMAGE_REL3 model are in good agreement with that of impact test, thus the ultimate strength of RPC-FST after exposure to high temperature can be estimatedaccurately.

导出引用

郭伟东，?陈万祥，张涛，梁文光. 高温后钢管RPC动态力学性能及数值模拟研究[J]. 振动与冲击, 2017, 36(10): 159-167

GuoWeidong, Chen Wanxiang, Zhang Tao,Liang Wenguang. Test and numerical simulation of dynamic behavior of Reactive Powder Concrete-Filled Steel Tube after exposure to high temperatures[J]. Journal of Vibration and Shock, 2017, 36(10): 159-167

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