蜻蛉河双线特大桥主桥抗震分析

Seismic analysis of Qingling River twin bridges main part

通过Midas Civil建立三维有限元模型,分析蜻蛉河双线特大桥主桥动力特性,并采用反应谱法计算多遇地震下的地震效应,同时进行抗震验算。计算结果表明,在多遇地震作用下,桥墩截面保持弹性状态。罕遇地震作用下,延性比小于规范规定的4.8,能够保证结构在地震作用下的安全。

A three-dimensional finite element model was established by Midas Civil software, dynamic characteristic of Qingling River twin bridge＇ s main part were analyzed, and seismic effect under frequent earthquake was computed using the response spectrum method. Furthermore, anti-seismic checking calculation was performed, and according to calculation results,it was shown that sections of bridge piers remained elatic under frequent action while ductility ratio under rare seismic action was less than 4.8 specified in the related code, thus being capable of ensuring safety of the structure under earthquake.