摘要
地铁明挖车站和市政桥梁合建时,为同时满足2种不同类型构筑物的安全和使用功能要求,需对其中的关键技术难题进行分析研究,以采取合理可行的结构形式。依托成都地铁白佛桥明挖车站与其上部市政桥梁的建设,总结国内类似工程经验,根据工程特点确定桥梁承台与地铁车站顶板进行固结连接,桥梁跨度与地铁车站框架柱跨进行匹配,同时桥墩避开地铁车站端头井、换乘节点等复杂结构受力区域进行布设;建立三维荷载-结构模型,计算分析上部桥梁荷载对地铁车站结构构件内力及变形的影响,并根据计算结果,对桥墩影响范围内的车站顶底板和侧墙的厚度及配筋进行增强,桥墩轴线下方的地铁车站框架柱采用型钢-混凝土组合结构,以满足合建结构的承载能力、变形、裂缝控制等要求。另外,选取LS-DYNA软件,采用非线性时程分析法对合建结构进行抗震计算分析,计算结果显示:车站板、墙、梁等构件在支座处出现应力集中现象,各结构构件的承载力强度及变形均满足规范要求。
The safety and normal operation of open-cut metro station and municipal bridge should be guaranteed during integrated construction.Hence,the key construction technologies should be analyzed to select rational and feasible structure type.In this paper,the construction experience of similar projects in China is summarized to form key construction technologies of a metro station and upper municipal bridge in Chengdu,which include consolidation connection between bridge cushion cap and station roof,matching between bridge span and station frame column span,and piers away from complex stressed areas such as end shaft and interchange node of metro station.Three-dimensional load-structure model is established to analyze the effect of upper bridge load on structural internal force and deformation of metro structure.In order to meet the requirements of bearing capacity,deformation,and crack control of the integrated structure,the thickness and reinforcement of the top and bottom walls and sidewalls of the metro station within the impact area of the bridge pier are strengthened according to the calculation results;and the steel-concrete composite structure frame column of metro station below the pier axis is adopted.Meanwhile,the effect of earthquake on the structure is calculated by nonlinear time-history analysis method using LS-DYNA software;and the calculation results show that the stress concentration occurs in plates,walls,beams and other components of metro station,while the strength and deformation capacity of the structure can meet the specification requirements.
作者
汪乐
王涛
宋磊
WANG Le;WANG Tao;SONG Lei(China Design Group Co.,Ltd.,Nanjing 210014,Jiangsu,China)
出处
《隧道建设（中英文）》
北大核心
2018年第12期2006-2012,共7页
Tunnel Construction
关键词
地铁
明挖车站
市政桥梁
合建结构
三维荷载-结构模型
受力分析
变形控制
抗震分析
metro
open-cut metro station
municipal bridge
integrated structure
three-dimensional load-structure model
force analysis
deformation control
seismic analysis
