E2地震作用下某连续梁桥抗震性能分析

An Analysis of the Anti-Seismic Performance of a Continuous Beam Bridge Under the Action of an E2 Earthquake

为了研究强震作用下连续桥的抗震性能,以某(3×25 m)装配式预应力混凝土箱型连续梁桥为工程背景,建立全桥MIDAS CIVIL有限元模型,输入E2水平的3条地震动,通过动态时程分析方法分析了该连续梁桥的抗震性能,并对本桥抗震性能做出评估。研究结果表明:在恒载和E2地震共同作用下,本桥边墩墩底弯矩和中墩墩底弯矩均小于其屈服弯矩,且有一定的安全储备。从强度角度分析,本桥抗震性能良好。

In order to explore the anti-seismic performance of continuous beam bridges under strong earthquakes,a(3×25m)prefabricated pre-stressed concrete box continuous girder bridge is used as the engineering background to help establish a full-bridge MIDAS CIVIL finite element model and three earthquakes with E2 level are input,upon the basis of which the dynamic time history analysis method is applied to analyzing the anti-seismic performance of the continuous beam bridge in order to evaluate the anti-seismic performance of the bridge.The results of our research show that under the combined action of dead loads and E2 earthquake,the bottom bending moment of the side piers and the bending moment of the middle pier are found less than the yield bending moment,and thus there is still a certain safety storage.If analyzed from the angle of strength,the bridge has good anti-seismic performance.