无柱拱形车站中板结构受力特性数值分析

Numerical analysis on mechanical characteristics of middle plate in arch station without columns

以上海某无柱大跨拱形车站为背景,采用ABAQUS建立受拉中板数值模型,并开展了荷载标准值与设计值两种工况下的数值分析。结果表明,受拉中板变形以竖向位移为主;中板结构整体受拉,两端节点上部与跨中下部受拉应力较大,节点处上部钢筋拉应力较大,甚至接近屈服应力;中板—地连墙节点上部是最危险部位,需着重加强。

This paper used ABAQUS to establish the three-dimensional numerical model of the tensile middle plate and the middle plate-ground wall joint of one subway station in Shanghai.Numerical analysis was carried out under two conditions:standard load value and design load value.The results showed that the main deformation of the tensile middle plate is vertical displacement.The middle plate was subjected to tension.The upper part of the two ends and the lower part of the middle span were subjected to great tensile stress.The tensile stress of the upper rebar at both ends was large,even close to the yield stress.The upper part of the middle plate-ground wall joint was most dangerous and needed to be strengthened.