单轴压荷载下素混凝土动态特性及本构关系研究

基于31组混凝土立方体试件的动态压缩试验结果,研究了在不同应变速率下混凝土的强度、变形以及本构方程。研究发现:混凝土强度随着应变速率而增加的趋势明显;混凝土在不同应变速率下的应力-应变全曲线形状相似,具有明显的规律性,可以用本文提出的一组方程来表达。通过与试验数据对比发现,所提出的不同应变速率下混凝土材料的本构方程与试验结果吻合较好,可应用于混凝土结构动力设计中。

Study on Dynamic Properties of Plain Concrete under Uniaxial Compression and Its Constitutive Relation

Based on the dynamic compression tests of 31 cubic concrete specimens,the strength,deformation and constitutive model of the concrete were studied at different strain rates.The test results show that there is an obvious increasing trend of its ultimate strength with strain rates increasing;while its fundamental shapes of the stress-strain curves at different strain rates are similar to each other.A method is proposed here to determine the constitutive relation of the concrete at high strain rate by one set of formulas through several parameters.The comparison between theoretical and experimental results shows a very good agreement,and the theoretical method could be applied to the design of dynamic structures of concrete.