弹塑性混凝土挡块对梁式桥横桥向抗震性能影响分析

Effects of elastoplastic concrete retainer on seismic performances of the transverse direction of a girder-type bridge

通过对云南功东高速某桥梁进行反应谱地震响应分析和加速度时程地震分析,研究混凝土挡块非线性约束作用对梁式桥横桥向抗震性能的影响。作为对比,还进行了混凝土挡块对梁式桥横向完全约束和无约束工况的数值分析。分析中考虑了梁式桥在E1地震(50年超越概率10%)和E2地震(50年超越概率2.5%)两种设防水准地震输入下的地震响应。研究结果表明:混凝土挡块的横向约束对于提高桥墩的受力性能效果显著;弹塑性混凝土挡块可以有效约束桥墩横桥向的变形与受力,在实际工程中具有较好的应用前景。

Based on response spectrum seismic response analysis and acceleration time history seismic analysis on the K22+897 Dawanzi bridge in Bridge projects along Yunnan Province,the effects of nonlinear constraint behaviour of concrete retainer on seismic performances of the transverse direction of a girder-type bridge were investigated.As comparisons,numerical analysis for the conditions of completely constrained and unconstrained behaviours of the concrete retainer on transverse direction of a girder-type bridge was conducted.The seismic responses of the girder-type bridge under the input of two types of fortification leveling earthquake,E1 earthquake(10%surpassing probability in 50 years)and E2 earthquake(2.5%surpassing probability in 50 years),were considered.The investigation results showed that:The transverse restraints of concrete retainers showed a significant improvement the mechanical performance of bridge piers;Elastoplastic concrete retainers can effectively restrain the transverse deformation and stress of bridge piers,and showed the superior application prospect in practical engineering.