轨道交通地下车站大跨结构形式比选

Comparison and Selection of Long Span Structural Form of Rail Transit Underground Station

基于苏州轨道交通8号线地下换乘站的建设,在参考国内类似工程经验的基础上,针对换乘节点处的大跨结构,采用大型仿真计算软件Midas Gen,建立三维荷载-结构模型,分别对普通钢筋混凝土结构、密肋楼盖结构以及钢-混凝土组合结构的内力变形特性进行比选分析。分析结果表明,相较其他两种结构,钢-混凝土组合结构的承载能力更强,能较大程度地优化构件截面尺寸,减小构件配筋、裂缝宽度及变形。通过对梁柱节点的受力性能、施工要点等的调研,得出钢-混凝土组合结构可以更好地适用于地下大跨结构,可为今后的建设提供借鉴。

Based on the construction of the underground transfer station of Suzhou Rail Transit Line 8,referring to the domestic similar engineering experience,this paper uses the simulation software Midas Gen for the large-span structure at the transfer node,a three-dimensional load-structure model is established to analyze the internal force and deformation characteristics of ordinary reinforced concrete structure,multi ribbed floor structure and steel-concrete composite structure.The research shows that,compared with the other two structures,the bearing capacity of steel-concrete composite structure is stronger,which can largely optimize the component section size,reduce the structure reinforcement ratio,crack width and deformation.By the investigation of the mechanical performance and construction points of beam column joints,steelconcrete composite structure is well adapted to underground large-span structures.This project can provide reference for future construction.