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实际工程中的混凝土结构大多处于复杂应力状态,该文考虑混凝土组成材料物理性能的差异及横向变形性等特点,基于混凝土单轴受拉弹簧-摩擦块细观单元,建立混凝土双轴拉-压随机损伤细观模型。在双轴拉-压荷载组合作用下,根据混凝土破坏过程中的能量守恒原理,分别建立超高强高性能混凝土、普通混凝土及高强混凝土综合随机损伤本构关系,并针对损伤本构函数进行多参数灵敏度分析。通过理论值与试验结果的比较,验证了提出的随机损伤本构关系的有效性。
Most of the concrete structures in actual engineering are in complex stress state. Based on the difference of physical properties and transverse deformation of concrete, the concrete biaxial tension-compression Random damage meso-model. Under the combination of biaxial tension-compression load, according to the principle of energy conservation in the process of concrete failure, the constitutive relations of the random damage of ultra-high-strength high-performance concrete, ordinary concrete and high-strength concrete are established respectively. sensitivity analysis. By comparing the theoretical value with the experimental results, the validity of proposed constitutive relation of random damage is verified.