高温后钢管RPC抗冲击压缩特性与极限强度计算  

IMPACT BEHAVIORS AND ULTIMATE STRENGTHS OF RPC-FST AFTER EXPOSURE TO HIGH TEMPERATURE

作　　者：姜猛[1] 陈万祥[1] 郭志昆[1] 邹慧辉 顾娟[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：《工程力学》2017年第5期216-225,共10页Engineering Mechanics

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。Dynamic behavior of 30 Reactive Powder Concrete-Filled Steel Tube （RPC-FST） specimens after exposure to high temperature under different impact loading is investigated by using φ74mm-Split Hopkinson Pressure Bar （SHPB）. Dynamic stress-strain relationships and failure modes for RPC-FST after exposure to high temperature are derived experimentally, and then a prediction method for peak stress or peak strain of RPC-FST specimens is presented. ResuRs show that obvious strain rate effects can be observed in RPC-FST specimens under impact loading, and RPC-FST still remain remarkable compressive strength, good ductility and integrity after exposure to high temperature. The steel ratios have great influences on the dynamic behavior of RPC-FST, either initial elastic stiffness or peak stress is significantly increased as steel ratio increased. The analytical results are in good agreement with experimental data, which means that the dynamic peak stress or peak strain of RPC-FST 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 理论公式 

分 类 号：TU398.9[建筑科学—结构工程]