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本文总结分析了在施加预静载条件下的混凝土轴压、轴拉和弯拉试验成果。利用混凝土动态损伤数值分析方法,考虑了混凝土细观结构的不均匀性,同时也考虑了混凝土拉、压敏感性的不同,进行了轴压、轴拉和弯拉数值试验,得到了与试验观测结果一致的规律。研究表明:预静载对混凝土动态强度的强化和弱化作用与混凝土材料的应变率强化效应有直接关系,混凝土的动态抗拉强度和弯拉强度在一定预静载水平下均存在不同程度的增强趋势。
This paper summarizes and analyzes the results of axial compression, axial tensile and flexural tests of concrete under pre-static loading conditions. Taking numerical analysis of concrete dynamic damage into consideration, the inhomogeneity of concrete mesostructure is taken into account. At the same time, the numerical experiments of axial compression, axial tension and bending are also taken into account, and the experimental observations The result is consistent with the law. The results show that the strengthening and weakening effect of pre-static load on the dynamic strength of concrete is directly related to the strain-rate-hardening effect of concrete. The dynamic tensile strength and flexural strength of concrete under certain pre-static load level are enhanced to some extent trend.