采用压顶梁抗浮的地铁车站主体结构整体响应分析  

Analysis of the Whole Response of Metro Station Main Structure Built with Anti-floating Coping Beam

作　　者：郭正伟 

机构地区：[1]中铁工程设计咨询集团有限公司郑州设计院,郑州工程师450001

出　　处：《城市轨道交通研究》2016年第3期71-76,共6页Urban Mass Transit

摘　　要：在明挖地铁车站抗浮设计中越来越多地采用的压顶梁抗浮型式。该型式具有易于与围护结构结合使用、施工简便、抗浮性能可靠等优点。将压顶梁和围护结构二者结合作为抗浮压重措施,对地铁车站主体结构利用有限元软件建立足尺三维荷载-结构模型,从理论上对抗浮工况下地铁车站主体结构进行受力分析,揭示压顶梁作用下地铁车站结构的一系列力学响应。研究表明:在浮力和压顶梁共同作用下,车站结构顶板呈下沉状态,浮力影响主要通过侧墙传递至顶板,结构抗浮满足要求;底板位移呈山峰状分布,底板中部为结构抗浮不利部位,宜增设必要的抗浮措施,如抗拔桩等;底板配重可较好地约束浮力作用下底板结构的上浮变形,且变形更均匀;车站结构局部出现裂缝,但通过配筋设计可使裂缝控制在规范允许的范围内,满足正常使用要求。Top beam is frequently adopted as the main anti- floating measure in the design of open-cut metro station, which features compatibility with building envelope, simple construc- tion and reliable performance related to anti-floating. In this paper, the combination of top beam and building envelope is a- dopted as one anti-floating measure, a full-scale 3D load structure model of metro station is performed by using the finite el- ement software, to analyze theoretically the mechanical behavior of the main station structure in anti-floating condition. The application of the the combination reveals that the bilateral station floors sink and the middle part uplifts, the buoyancy is transferred to the roof through lateral wall, while the corresponding anti-floating structure could meet the requirements specified in relative codes. The entire structure presents mountain-shaped deformation, while the middle position of floor bears unfavorable mechanics. Thus, the anti-floating measures shall be implemented to constrain buoyancy induced floating,which results in homogeneous structural deformation. Local fissures would appear at the station structure, but it still meets the requirement pertaining to the reinforcement design.

关 键 词：地铁车站 压顶梁抗浮 围护结构 力学响应 

分 类 号：U231.3[交通运输工程—道路与铁道工程]