钢管RPC抗冲击压缩特性及极限强度确定方法

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摘要采用ø74mm分离式霍普金森压杆（Split Hopkinson Pressure Bar，简称SHPB）试验装置，分别对20块钢管活性粉末混凝土（Reactive Powder Concrete-Filled Steel Tube，简称钢管RPC）和20块RPC试件进行了不同加载速率的冲击压缩试验，得到了不同应变率下的动态应力-应变曲线、峰值应力和峰值应变，分析了试件的破坏特征。在钢管混凝土静态轴向极限承载力计算公式基础上引入应变率效应，得到钢管RPC极限强度确定方法。结果表明：钢管RPC和RPC的峰值应力和峰值应变均随平均应变率增大而增大。冲击荷载作用下，钢管RPC比RPC具有更高的强度，更好的延性和完整性，是一种良好的抗冲击防护工程材料。钢管壁厚对钢管RPC动态应力-应变关系有明显影响，一定冲击速度下壁厚较薄的钢管RPC出现了明显的屈服平台和应力强化现象，峰值应变也显著增大。钢管RPC极限强度理论计算结果与试验结果存在一定的相对误差，但随着响应应变率增大相对误差逐渐减小。

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	陈万祥
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	郭志昆1
	姜猛1
	闫凤国1
	顾娟1

关键词 ：霍普金森压杆, 冲击荷载, 钢管RPC, 应力-应变曲线, 动态行为

Abstract：

Dynamic behaviors of 20 Reactive Powder Concrete-Filled Steel Tube (RPC-Filled Steel Tube) specimens and 20 Reactive Powder Concrete (RPC) specimens under different impact loading are performed by using ø74 mm-Split Hopkinson Pressure Bar (SHPB), respectively. The stress-strain relationships, peak stress and peak strain of specimens in condition of different average strain rates are derived, the failure modes of specimens are also discussed. The prediction method of ultimate strength for RPC-Filled Steel Tube under impact loading is presented by means of introducing Dynamic Increase Factor (DIF) into the ultimate strength formula of RPC-Filled Steel Tube under static axial loading. It is indicated that the peak stress and peak strain of both RPC-Filled Steel Tube and RPC are increased as average strain rates increased. RPC-Filled Steel Tubes have higher strength, better ductility and integrity than RPC under impact loading, and the results show that RPC-Filled Steel Tube is a good material to resist to impact loads in protective engineering. The thickness of steel tube has obviously influence on the dynamic behaviors of RPC-Filled Steel Tube. Yielding state and stress hardening process can be observed in the specimens with smaller thickness, and the peak strain is also increased slightly. There are some deviations between analytical results and experimental data, but the relative errors are reduced as the strain rates of RPC-Filled Steel Tubes increased.

Key words： Split Hopkinson Pressure Bar (SHPB) impact loading RPC-Filled Steel Tube stress-strain curve dynamic behavior

收稿日期: 2015-08-19 出版日期: 2016-10-15

引用本文:

陈万祥,2，郭志昆1，姜猛1，闫凤国1，顾娟1. 钢管RPC抗冲击压缩特性及极限强度确定方法[J]. 振动与冲击, 2016, 35(20): 160-171.
Chen Wan-xiang1,2, Guo Zhi-kun1, Jiang Meng1, Yan Feng-guo1,Gu Juan1. Dynamic behaviors and ultimate strengths of RPC-Filled Steel Tubes under impact loading. JOURNAL OF VIBRATION AND SHOCK, 2016, 35(20): 160-171.

链接本文:

http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2016/V35/I20/160

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