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高温下混凝土冲击加载试验研究

DOI: 10.11858/gywlxb.2013.03.016, PP. 417-422

Keywords: 混凝土,高温,分离式霍普金森压杆(SHPB),动力特性

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Abstract:

在传统的分离式霍普金森压杆(SplitHopkinsonPressureBar,SHPB)装置的基础上,通过加装管式电阻炉等手段,获得了一套用于测量材料在高温下动态压缩力学性能的SHPB系统,并对200~800℃高温下混凝土进行了冲击加载试验,得到了应力-应变关系曲线。研究结果表明,该高温SHPB试验系统可用于研究高温下混凝土的动力特性;混凝土在不同温度下的动态抗压强度、峰值应变随着弹速的增加都有一定程度的提高;高温对混凝土动力特性影响显著,随着温度的提高,峰值应变随之增加,而动态抗压强度呈现先增后微降、600℃后迅速下降的趋势。

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