城市轨道交通枢纽一体化车站结构震害机理

来源期刊:中南大学学报(自然科学版)2021年第3期

论文作者:陶连金 韩学川 张宇

文章页码:925 - 936

关键词:一体化结构;地震响应;数值分析;空间效应

Key words:integrated structure; earthquake response; numerical analysis; spatial effect

摘    要:为了研究城市轨道交通一体化地铁车站结构的地震响应特性及震害机理,基于混凝土塑性损伤理论,采用ABAQUS有限元软件建立静-动力耦合大型三维有限元数值模型,计算分析地震损伤演化过程和破坏机理,探讨一体化地铁车站结构的空间效应。研究结果表明:城市轨道交通枢纽一体化结构兼备地铁地下车站结构和地上结构2种特性,原有单体车站结构的动力特性和反应发生改变;一体化地铁车站结构的水平位移随车站结构埋深增加逐渐减小,层间相对水平位移随车站结构埋深增加逐渐增大,车站结构的横截面方向和竖向均发生塑形变形,表现出塑形积累现象;一体化地铁车站各层楼板和墙柱的交接处是抗震最不利位置,底层中柱和侧墙底部的损伤最严重,是整个结构的抗震薄弱部位,应该着重加强车站底部结构构件的抗震构造措施;城市轨道交通枢纽一体化地铁车站结构表现出显著的空间效应,地铁车站不同区域的位移反应和内力反应差异显著,其中,地铁车站一体化区域的层间水平位移约为非一体化区域层间水平位移的5%,而柱端剪力差异明显,剪力最大值甚至增加200%。

Abstract: In order to study the earthquake response characteristics and disaster mechanism of integrated subway station structure of urban rail transit, a large-scale three-dimensional finite element numerical model of static-dynamic coupling was established by ABAQUS finite element software based on the plastic damage theory of concrete. The earthquake damage evolution process, failure mechanism and spatial effect of the integrated subway station structure of urban rail transit hub were analyzed and discussed. The results show that integrated structure of urban rail transit hub has the characteristics of subway underground station structure and above-ground structure, and the dynamic characteristics and response of the original single station structure change. The horizontal displacement of integrated subway station structure decreases gradually with the increase of buried depth of station structure, and the relative horizontal displacement between floors increases gradually with the increase of buried depth of station structure. The plastic deformation occurs in the direction of cross section and the vertical direction of station structure, which shows the phenomenon of plastic accumulation. The joint of floor slab and wall column is the most disadvantageous position. The damage of bottom middle column and side wall bottom is the most serious, which is the weak part of the whole integrated subway station structure. Therefore, the seismic measures of the structural members at the bottom of the station should be strengthened. The integrated subway station structure of urban rail transit hub shows significant spatial effect. The displacement response and internal force response of different areas of subway station are significantly different. The horizontal displacement between floors of the integrated area is about 5% of that of the non-integrated area, while the maximum value of shear force at the end of the column increases by 200%.

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