钢筋混凝土剪力墙非线性分析模型及损伤准则

Nonlinear Analysis Model and Damage Criteria of Reinforced Concrete Shear Wall

通过LS-DYNA程序开发了一种剪力墙的宏观模型,基于此模型,提出一种适用于剪力墙的考虑首次超越破坏和能量累积破坏的双参数损伤准则.超越破坏是通过拟合各等级损伤指数与相应应变值的对数函数,累积破坏的极限耗能定义为所开发模型包络线所围成的面积,当应变阈值和累积耗能超过临界值时,可以考虑两者的耦合效应.应用所开发的剪力墙模型,数值模拟了两个剪力墙的低周反复试验,结果表明:所开发的模型能以很低的计算成本较精确地模拟剪力墙滞回关系,并且所提出的损伤准则能很好地跟踪构件损伤发展过程.

Based on the LS-DYNA program, a macro shear wall model is developed, in which a two-parameter shear wall damage criteria combined with the first passage damage and cumulative damage is proposed. The first passage damage is a logarithmic function fitted by the damage index and corresponding strain, and the ultimate dissipation energy of the cumulative damage is defined as the surrounded area of the envelop curve. When the threshold strain and cumulative energy exceed their critical values, the coupling effect is considered. The shear wall model is used to simulate the cyclic loading test of two shear walls, and results indicate that the model can simulate the hysteresis process precisely with low cost, and the damage criteria can track the damage process of shear wall well.