基于OpenSees钢筋混凝土空心桥墩的抗震性能分析

Analysis of seismic behavior of reinforced concrete hollow column bridge using Open Sees

运用OpenSees软件,利用纤维模型方法建立了钢筋混凝土空心桥墩有限元模型,并进行了拟静力加载过程分析,研究恒载轴压比和纵筋配筋率对混凝土空心桥墩抗震性能的影响,结果表明:基于OpenSees有限元软件建立的纤维单元有限元模型,模拟结果和试验结果吻合度较高,说明建立的模型能正确反映桥墩的抗震性能;提高恒载轴压比和增大纵筋配筋率,钢筋混凝土空心桥墩的抗震性能均得到显著改善,但随着恒载轴压、纵筋配筋率的增大,残余位移也相应增大。

The model of reinforced concrete bridge column with hollow section is set up utilizing fiber beam column element with the OpenSees, to analyze the pseudo static behavior and investigate the effect of axial dead load ratio and longitudinal reinforcement ratio on seismic performance of reinforced concrete hollow column bridge. The results show that： using the OpenSees, a detailed two dimensional fiber element model is devel- oped. The finite element model was validated by good agreement between the simulated and experimental results. Raise the axial dead load ratio and increase the longitudinal reinforcement ratio, the seismic performance of reinforced concrete hollow pier have been significantly improved, but with the axial dead load ratio, longitudinal reinforcement ratio increases, the residual displacement is correspondingly large.