桥隧共建结构中隧道结构的地震响应分析

Seismic Response Analysis of Tunnel Structures in Bridge-Tunnel Co-construction System

摘要:

以苏州市东太湖隧道一期工程项目顺堤河桥隧共建节点为例，采用动力时程分析法，对桥隧共建节点进行整体有限元模拟，并在考虑桥梁上部结构刚度、附加荷载因素的基础上进行隧道结构抗震分析。根据有限元分析结果，针对中震（设防地震）、大震（罕遇地震）情况所进行的抗震专项设计，可确保隧道结构达到E1、E2地震作用下结构处于弹性阶段、E3地震作用下结构局部进入弹塑性阶段的抗震设防目标。

Abstract:

Taking the co-construction node of the bridge and tunnel along the causeway of Suzhou East Taihu Lake Tunnel Phase I Project as an example, the dynamic time-history analysis method is employed to conduct an overall finite element simulation of the bridge-tunnel co-construction nodes. On the basis of considering the bridge superstructure stiffness and the additional load factors, the seismic analysis of the tunnel structure is performed. According to the finite element analysis results, the special seismic design carried out for moderate earthquakes (fortification earthquakes) and major earthquakes (rare earthquakes) can ensure that the tunnel structure achieves the seismic fortification goal of being in the elastic stage under the action of E1 and E2 earthquakes and locally entering the elastic-plastic stage under the action of E3 earthquakes.