基于改进纤维模型的RC剪力墙静力弹塑性分析

Static elasto-plastic analysis for RC shear wall based on improved fiber model

为了使纤维模型能够有效模拟剪切效应,提出了一种基于塑性理论和虚拟单元法的改进纤维模型RC剪力墙全过程静力弹塑性分析方法.推导出等效单轴应力和等效单轴应变的计算公式,在纤维层面建立考虑剪切效应的应力和应变关系,将纤维由多轴受力状态等效为单轴受力状态,引入虚拟单元法来解决有限元数值计算过程中遇到的负刚度问题.利用自编程序及ABAQUS软件对一片钢筋混凝土剪力墙进行静力弹塑性分析,结果表明,自编程序计算曲线与试验曲线及ABAQUS软件计算曲线吻合较好,能够反映出剪切效应的影响.改进的分析方法简便有效,便于编程,可用于分析剪切效应明显的钢筋混凝土剪力墙构件.

In order to ensure the effective simulation of fiber model on the shear effect,a full static elasto-plastic analysis method for reinforced concrete（RC） shear wall with the improved fiber model based on plastic theory and virtual-element method was proposed.The calculation formulas for the equivalent uniaxial stress and strain were derived to establish the stress-strain relationship with considering the shear effect in the fiber layer.The multiaxial stress state of the fiber was equivalently converted into the uniaxial stress state.The virtual-element method was introduced to solve the negative stiffness problem in the finite element calculation process.The self-compiled program and ABAQUS software were used to carry out the static elasto-plastic analysis for a RC shear wall.The results indicate that the curves calculated with the self-compiled program are well accordant to those attained with both experiment and ABAQUS software,and can reflect the influence of shear effect.The improved analysis method is simple and effective as well as easy in programming,and can be applied to analyze the RC shear wall components with obvious shear effect.