公轨共建高架车站的抗震性能研究

Research on seismic performance of highway and rail transit co-construction station

随着城市轨道交通的延伸,出现了线路高架化的趋势,若轨道交通线路与城市快速路线路在空间上重叠,则出现了公轨共建的线路模式,目前在上海、北京和宁波等地均有类似的工程实例。本文以温州市域铁路S2线的人民路站为例,研究共建车站结构的抗震性能。首先根据结构的特征和构件的重要性确定不同的性能目标;其次分别进行E1地震作用下的弹性反应谱分析,E2地震作用下的弹塑性反应谱分析,E3地震作用下的非线性时程分析,经验算结构各项性能指标均达到各级地震水准下的性能要求;最后对车站结构补充了E3地震作用下的耗能分析,研究结构在地震作用下能量的耗散和转化机制,从能量的角度反映结构在大震下不发生倒塌的目标要求。

With the extension of urban rail transit,there has been a trend of elevated lines.If rail transit lines and urban highway lines overlap in space,there will be a pattern of public rail construction.At present,there are similar engineering examples in Shanghai,Beijing,Ningbo and other places.Taking Renmin Road Station on the S2 line of Wenzhou City Railway as an example,this paper studies the seismic performance of its structure.Firstly,different performance objectives are determined according to the characteristics of the structure and the importance of the components.The elastic response spectrum analysis under the E1 earthquake,the elastoplastic response spectrum analysis under the E2 earthquake and the nonlinear time-history analysis under the E3 earthquake are carried out.All the performance indexes of the structures meet the requirements of all the seismic levels.Finally,analysis on the energy dissipation of the station structure under the E3 earthquake is presented.The mechanism of energy dissipation and transformation of structure under the action of earthquake is studied.From the perspective of energy,the target that the structure does not collapse under a major earthquake is achieved.