高温后钢管RPC抗冲击压缩特性与极限强度计算

发布时间：2018-06-13 03:21

本文选题：钢管RPC + 高温后　；参考：《工程力学》2017年05期

【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。
[Abstract]:The shock compression tests of 30 reactive powder concrete filled steel tubes (RPCs) with different strain rates were carried out by using a split Hopkinson pressure bar (SHPB) with a split Hopkinson pressure bar of 74 mm and 30 reactive powder concrete tubes (RPCs) after high temperature. The dynamic stress-strain relationship and failure pattern of RPC after high temperature are obtained, and the prediction method of dynamic peak stress and peak strain of RPC after high temperature is put forward. The results show that RPC has obvious strain rate effect after high temperature, and the RPC of steel pipe after high temperature still maintains high strength, good ductility and integrity. The initial elastic stiffness and peak stress increase with the increase of the steel content. The theoretical results are in good agreement with the experimental results, which can be used to predict the dynamic peak stress and strain of RPC at high temperature.
【作者单位】：解放军理工大学爆炸冲击防灾减灾国家重点实验室;
【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)
【分类号】：TU528

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