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该文引入相互独立的拉损伤、压损伤演化规律,分别描述受拉开裂和受压破碎导致的混凝土损伤行为,然后采用非线性卸载-线性重加载模拟滞回行为,建立了改进的各向异性损伤模型。该文还建议了模型关键参数的率定方法。应用该模型模拟混凝土受拉和拉-压往复加载试验,计算获得的应力-应变曲线与试验曲线具有良好的可比性,能够反映损伤导致的刚度退化、残余变形累积、加卸载滞回耗能行为以及微裂缝闭合引起的刚度恢复现象。算例结果表明,该模型适宜模拟往复加载下的混凝土非线性行为。
In this paper, we introduce the independent damage-damage and pressure-damage evolution rules, and describe the concrete damage behavior caused by tension-cracking and compression-crushing separately. Then we simulate the hysteretic behavior by using nonlinear unloading-linear reloading to establish the improved anisotropy Damage model. The paper also suggests a method for determining the key parameters of the model. The model is used to simulate the tensile and compression tests of concrete. The calculated stress-strain curves are in good agreement with the experimental curves, which can reflect the damage caused by stiffness degradation, residual deformation, energy dissipation during loading-unloading and hysteresis As well as the restoration of the stiffness caused by the closure of micro-cracks. The results show that the model is suitable to simulate the nonlinear behavior of concrete under cyclic loading.