基于三维隔震的穿越地裂缝地铁车站地震反应控制研究  

Research on seismic response control of subway stations crossing ground fissures based on three⁃dimensional isolation

作　　者：熊仲明[1,2] 陈帜 许健健 陈轩[1,2] 阿鑫 Xiong Zhongming;Chen Zhi;Xu Jianjian;Chen Xuan;A Xin(School of Civil Engineering,Xi’an University of Architecture and Technology,Xi’an 710055,China;Shaanxi Key Laboratory of Geotechnical and Underground Space Engineering,Xi’an University of Architecture and Technology,Xi’an 710055,China;Qinghai Building and Materials Research Co.,Ltd.,Xining 810008,China;The Key Lab of Plateau Building and Eco-community in Qinghai,Xining 810008,China)

机构地区：[1]西安建筑科技大学土木工程学院,陕西西安710055 [2]西安建筑科技大学陕西省岩土与地下空间工程重点实验室,陕西西安710055 [3]青海省建筑建材科学研究院有限责任公司,青海西宁810008 [4]青海省高原绿色建筑与生态社区重点实验室,青海西宁81000

出　　处：《土木工程学报》2024年第8期36-48,共13页China Civil Engineering Journal

基　　金：国家自然科学基金(52378534);陕西省自然科学基金重点项目(2022JZ-23);青海省高原绿色建筑与生态社区重点实验室开放基金计划项目(KLKF-2020-003);陕西省住房城乡建设科技科研开发计划项目(2020-K31)。

摘　　要：穿越地裂缝地铁车站易发生严重地震破坏。文章基于地震动作用下地裂缝场地双向变形特征和结构破坏机理,探究穿越地裂缝地铁车站中柱三维隔震的适用性。考虑土与结构相互作用,建立穿越地裂缝地铁车站三维隔震结构数值模型。采用动力时程分析法,以无隔震与水平隔震结构为对比工况,研究穿越地裂缝地铁车站的三维隔震效果,并进一步揭示隔震机理。结果表明:单一的中柱水平隔震难以满足结构的地震反应控制需求;三维隔震支座不仅显著降低了中柱的地震反应,而且有效削弱了地震动作用下地裂缝上、下盘相对沉降对支座隔震效果和中柱抗震能力的不利影响,从而维持较高的减震水平;三维隔震后,车站结构侧墙内力增大而层间位移角的变化与其埋深、地震动强度与频谱特性等因素有关,车站结构顶、底板内力和变形均增大;车站结构抗震薄弱构件由中柱转变为顶板,而中柱和侧墙等竖向承载构件不发生严重地震破坏,避免结构倒塌。研究以期为地裂缝场地地下框架结构的灾变控制提供参考依据。Subway stations crossing ground fissures(SSCG)are highly susceptible to severe earthquake damage.This paper explores the applicability of three⁃dimensional seismic isolation(3DI)for central columns in SSCG,based on the bidirectional deformation characteristics of ground fissure sites under seismic activity and the structural damage mechanisms involved.A numerical model incorporating soil⁃structure interaction was developed to simulate a 3DI structure for SSCG.The dynamic time⁃history analysis method was utilized,comparing non⁃isolated and horizontally isolated structures to evaluate the effectiveness of 3DI and elucidate its isolation mechanisms.The findings reveal that horizontal isolation alone is inadequate for fulfilling the seismic response control requirements for the structure.The 3DI bearings not only substantially decrease the seismic response of the central column but also effectively counteract the negative impacts of relative settlement between the hanging wall and footwall on the isolation performance and seismic capacity of the column,thus ensuring a high level of seismic mitigation.Post⁃implementation of 3DI,there is an increase in the internal forces within the side walls,while variations in the interlayer displacement angle correlate with factors such as the structural burial depth,seismic intensity,and spectral characteristics.Additionally,there is an increase in the internal forces and deformations of both the top and bottom slabs,with the weak seismic component of the structure shifting from the central column to the top slab.Importantly,the vertical load⁃bearing components,such as the columns and side walls,avoid severe earthquake damage,thereby preventing structural collapse.This research serves as a crucial reference for disaster control strategies for underground frame structures at ground fissure sites。

关 键 词：地裂缝 三维隔震 地铁车站 时程分析 

分 类 号：TU93[建筑科学—结构工程]