钢筋混凝土双柱墩滞回性能数值模拟与分析
Numerical simulation and analysis of hysteretic behavior of RC two-columned piers

为了探究地震作用下钢筋混凝土双柱墩的力学性能及其影响因素,在详细阐述弹塑性损伤帽盖模型的基础上,利用ANSYS/LS-DYNA有限元软件建立了钢筋混凝土双柱墩精细有限元数值模型,并基于正交试验设计原理,采用低周反复加载制度,进行了不同轴压比、配筋率、配箍率、混凝土强度的钢筋混凝土双柱墩滞回性能的数值模拟实验.计算结果表明:该精细有限元模型能够很好地模拟钢筋混凝土双柱墩的滞回性能;双柱墩的配筋率对其最大抗力与延性能力2个指标的影响最为显著;轴压比与混凝土强度对这2个指标的影响较大;配箍率在超过一定数值后,对这2个指标的影响较小.
In order to study the mechanical characteristics and its influential factors of reinforced concrete(RC)two-columned piers when suffering seismic action, the elasto-plastic damage cap model for concrete is explained in detail, and the finite element models of the piers are developed by the software ANSYS/LS-DYNA. By means of the orthogonal experiment design methods and low-cycle reversed loading procedures, the influences of axial compression ratio, longitudinal reinforcement ratio, stirrup reinforcement ratio and concrete strength on the mechanical characteristics of the piers are investigated. Results show that the finite element model of the RC two-columned piers developed above is capable of simulating the hysteretic behavior very well. The longitudinal reinforcement ratio has the most significant impact on the largest resistant force and the ductility capacities of the piers, the influences of the axial compression ratio and concrete strength are prominent, and the stirrup reinforcement ratio affects little when exceeding a certain level