场地土对枢纽车站屋盖空间结构地震响应影响分析  

Analysis of the influence of site soil on the seismic response of space roof structure of the hub station

作　　者：丁阳[1,2] 刘倩 宗亮[1,2] 石运东 DING Yang;LIU Qian;ZONG Liang;SHI Yundong(School of Civil Engineering,Tianjin University,Tianjin 300350,China;Key Laboratory of Coastal Civil Structure of Safety of the Ministry of Education,Tianjin 300350,China)

机构地区：[1]天津大学建筑工程学院,天津300350 [2]滨海土木工程结构与安全教育部重点实验室,天津300350

出　　处：《地震工程与工程振动》2023年第2期34-41,共8页Earthquake Engineering and Engineering Dynamics

基　　金：国家自然科学基金面上项目(52178497);国家重点研发计划项目(2018YFC504304)。

摘　　要：城市综合枢纽车站结构一般由屋盖大跨空间结构和下部混凝土框架结构组成,目前对车站结构抗震性能的研究很少考虑场地土的影响。建立国内某典型枢纽车站土-车站结构有限元模型,研究了场地土对车站屋盖大跨空间结构地震响应的影响规律。结果表明:考虑场地土改变了屋盖大跨空间结构的动力特性,随着场地土厚度增大结构自振频率减小;随着场地土剪切波速增大结构自振频率增大,场地土厚度较小时屋盖结构挠度和杆件应力随场地土剪切波速增大而减小;场地土厚度较大时存在临界剪切波速,小于临界剪切波速即在场地土较软时,屋盖结构挠度和杆件应力随剪切波速增大而增大;大于临界剪切波速即场地土较硬时,屋盖结构挠度和杆件应力随剪切波速的增大而减小;随着场地土厚度增大临界剪切波速增大;在临界剪切波速下,屋盖挠度为基岩条件下的2.34~3.07倍,最大杆件应力为基岩条件下的1.35~2.86倍,因此,综合枢纽车站结构抗震性能分析时应考虑场地土的影响。An urban comprehensive hub station structure is generally composed of a large-span roof structure and a lower concrete frame structure.At present,the research on the seismic performance of the station structure seldom considers the influence of the site soil.This paper established a finite element model considering soil-station structure interaction of a typical hub station in China,and studied the influence of site soil on the seismic response of the large-span spatial roof structure of the hub station.The results show that considering the influence of the site soil changes the dynamic characteristics of the large-span roof structure,the natural vibration frequency of the structure decreases with the increase of the site soil thickness,and the natural vibration frequency of the structure increases with the increase of the site soil shear wave velocity.When the site soil thickness is small,the deflection of the roof structure and the stress of the members decrease with the increase of the shear wave velocity of the site soil.When the thickness of the site soil is large,there is a critical shear wave velocity.When the shear wave velocity is less than the critical shear wave velocity,that is,when the site soil is soft,the structural deflection and member stress increase with the increase of the shear wave velocity.When greater than the critical shear wave velocity,that is,when the site soil is hard,the roof structure deflection and member stress decrease with the increase of the shear wave velocity.As the soil thickness increases,the critical shear wave velocity increases.Under the critical shear wave velocity,the roof deflection is 1.91~3.07 times that of the bedrock condition,and the maximum member stress is 1.35~2.86 times that of the bedrock condition.Therefore,the influence of site soil should be considered when analyzing the seismic performance of the comprehensive hub station structure.

关 键 词：综合枢纽车站 屋盖大跨空间结构 地震响应 场地土 场地土厚度 剪切波速 

分 类 号：TU399[建筑科学—结构工程]