基于壳-弹簧模型的装配式车站结构纵向受力分析  

Longitudinal Force on Prefabricated Station Structure Basedon Shell-Spring Model

作　　者：逄显昱 黄美群 吴成刚 郑书悦 PANG Xianyu;HUANG Meiqun;WU Chenggang;ZHENG Shuyue(Beijing Urban Construction Design and Development Group Co.,Ltd.,Beijing 100037)

机构地区：[1]北京城建设计发展集团股份有限公司,北京100037

出　　处：《都市快轨交通》2023年第2期72-81,共10页Urban Rapid Rail Transit

基　　金：国家重点研发计划(2017YFB1201104);住建部研究开发项目(2020-K-14)。

摘　　要：随着装配式车站的大范围推广应用,其面临着越来越多的复杂地质情况。在软硬不均地层中,装配式结构为柔性结构时对差异地层具有很好的适应性,结构的纵向受力较现浇车站有所不同,需对其受力特点进行研究。以深圳地铁某装配式车站为工程背景,采用有限元数值模拟方法构建壳-弹簧计算模型,研究在均匀及软硬不均地层的复杂工况下,装配式车站结构纵向沉降与受力特点。研究结果表明:位于均匀地层中的结构纵向受力主要受中立柱的影响,但其影响较小;位于软硬不均地层中的装配式车站结构存在纵向不均匀沉降,尤其在结构底板更为明显,顶板和侧墙结构其差异沉降的速率相对较缓;软硬不均地层中不仅对车站结构纵向受力存在影响,也对车站结构的横向受力存在一定的影响,顶板拱顶、拱肩弯矩增加约10%,拱顶轴力减少约8%,在设计中应考虑此因素的影响;在岩面突变地层中底板结构的剪力约316 kN,在渐变地层中剪力变化相对均匀,设计采用的凹凸榫槽结构能满足抗剪需求;同时在软硬不均地层中存在结构的纵向变形,环缝的张开量有所增加,但其增加的缝宽较小,在装配式车站防水允许限值以内。With the widespread application of prefabricated station structures,increasingly complex geological conditions are encountered.Prefabricated structures are flexible and adapt well to differences in soft–hard uneven strata.The longitudinal force of the prefabricated structure differs from that of a cast-in-place structure;therefore,its stress characteristics must be studied.In this study,a prefabricated structure of the Shenzhen Metro was considered as the engineering background,and a shell-spring model was constructed using a finite element numerical simulation method to investigate the longitudinal settlement and stress characteristics of a prefabricated structure under the complex conditions of uniform and soft–hard uneven strata.The results showed that the longitudinal force of the structure in a uniform stratum was mainly affected by the middle column;however,its influence was slight.Longitudinal uneven settlement existed in the prefabricated structure in the soft–hard uneven strata,particularly on the structural floor,and the rates of differential settlement of the roof and sidewall structures were relatively slow.The soft–hard uneven stratum not only affected the longitudinal force of the structure but also influenced its transverse force.The bending moment of the arch crown and shoulder on the roof plate increased by approximately 10%,whereas the axial force on the arch crown decreased by approximately 8%.The influence of these factors should be considered in the design.The shear force of the floor structure in the rock surface mutation stratum was approximately 316 kN,and the change in shear force was relatively uniform in the gradual stratum.The shear capacities of the concave and convex tenon grooves used in the design satisfied the stress demands.At the same time,there was a longitudinal deformation of the structure in the soft and hard uneven strata,and the opening of the ring joint increased;however,the increased seam width was small and met the requirements of the waterproof sealing strip of

关 键 词：地铁 装配式车站 壳-弹簧模型 注浆式榫槽接头 结构横向受力 结构纵向受力 不均匀沉降 

分 类 号：U231[交通运输工程—道路与铁道工程] TU93[建筑科学—结构工程]