高温后钢管RPC动态力学性能及数值模拟研究  

Test and numerical simulation on the dynamic behavior of reactive powder concrete-filled steel tubes after exposure to high temperatures

作　　者：郭伟东[1] 陈万祥[1] 张涛[1] 梁文光[1] 

机构地区：[1]解放军理工大学爆炸冲击防灾减灾国家重点实验室,南京210007

出　　处：《振动与冲击》2017年第10期159-167,共9页Journal of Vibration and Shock

基　　金：国家自然科学基金项目(51378498;51578541;51321064);江苏省自然科学基金项目(BK20141066)

摘　　要：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。The dynamic behaviors of a group of 30 specimens of reactive powder concrete-filled steel tubes(RPCFSTs) after exposure to high temperature under different impact loading were tested by using a φ74 mm split Hopkinson pressure bar(SHPB).The dynamic stress-strain relationships and failure modes of RPC-FST specimens were investigated experimentally.The representative values of cylinder compressive strengths were obtained based on the temperature field simulation by using ANSYS code,and the dynamic behaviors of RPC-FSTs after exposure to high temperature were further simulated by using LS-DYNA code.The results show that obvious strain rate effects can be observed in RPC-FST specimens under impact loading,while the specimens still keep remarkable compressive strength,good ductility and integrity after exposure to high temperature.Furthermore,the deformation capabilities of RPC-FSTs after exposure to high temperature are increased.The simulated results based on the * MAT-CONCRETE-DAMAGE-REL3 model are in good agreement with those of the present impact tests,thus the ultimate strength of RPC-FSTs after exposure to high temperature can be estimated accurately.

关 键 词：钢管RPC 高温后 抗冲击性能 动态强度 数值模拟 

分 类 号：TU398[建筑科学—结构工程]