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将弹塑性纤维模型引入基于柔度法的非线性梁柱单元,通过有限元分析软件OpenSees对钢筋混凝土桥墩在低周反复荷载作用下的受力性能进行了模拟.对墩底截面内力、变形和钢筋受拉应变进行了参数分析.结果表明:墩底截面内力和刚度随轴压比和配筋率的增大而增大,截面变形和钢筋受拉应变随轴压比和配筋率的增大而减小,随着延性比的增加,轴压比较大的试件的截面曲率和受拉钢筋应变的增长程度更加显著,钢筋硬化参数对于分析结果有较大影响.
The elastic-plastic fiber model is introduced into the nonlinear beam-column element based on the flexibility method, and the finite element analysis software OpenSees is used to simulate the behavior of the reinforced concrete piers under low cyclic loading. The results show that the internal forces and the stiffness of the pier bottom section increase with the increase of the axial compression ratio and the reinforcement ratio. The deformation of the section and the tensile strain of the reinforcement with the increase of the axial compression ratio and the reinforcement ratio With the increase of the ductility ratio, the section curvature of the specimen with larger axial compression ratio and the growth of the tensile strain of the steel tend to increase more significantly. The hardening parameters of the steel have a greater impact on the analysis results.