考虑地裂缝影响的连体结构地震动力响应分析  

Seismic dynamic response analysis of conjoined structures considering the influence of ground fissures

作　　者：郭宏超[1] 郭品彰 张博明 蔡玉军[2] GUO Hongchao;GUO Pinzhang;ZHANG Boming;CAI Yujun(Faculty of Civil Engineering and Architecture,Xi’an University of Technology,Xi’an 710048,China;China Railway the First Survey and Design Institute Group Co.Ltd.,Xi’an 710043,China)

机构地区：[1]西安理工大学土木建筑工程学院,陕西西安710048 [2]中铁第一勘察设计院集团有限公司,陕西西安710043

出　　处：《西安理工大学学报》2023年第1期141-150,共10页Journal of Xi'an University of Technology

基　　金：国家自然科学基金资助项目(51978571);陕西省杰出青年科学基金资助项目(2021JC-41);陕西省重点研发计划项目(2022SF-199)。

摘　　要：西安火车站东配楼为不规则连体结构,其质量与刚度分布差异较大,地震作用下的平扭耦合效应显著,不利于结构抗震,为研究地震作用下f 3地裂缝对该连体结构动力响应的影响,本文采用ABAQUS有限元软件分别建立了f 3地裂缝场地与无地裂缝场地的土体结构耦合模型,对比分析了地震作用下结构的位移、加速度及扭转等响应。结果表明:地裂缝增强了地震的激励作用和连体结构的动力响应,由于大区各柱脚距地裂缝距离均不相同,因此大区的扭转响应显著提升,增幅达到了191.61%;在弹性与弹塑性阶段,连体结构的最大层间位移角分别为1/580和1/51,满足相关规范要求;大、小三角区的位移及加速度大致相同,表现出较强的平动耦联效应;而大跨桁架连廊采用滑动支座能有效释放连体结构的相对位移,并降低强震作用下大区与小三角区的扭转耦联效应;连体结构的薄弱层为1、2层,应进一步提升结构刚度。The east annex of Xi’an railway station is an irregular conjoined structure,its mass and stiffness distribution are quite different,and there is a significant horizontal-torsional coupling effect in the earthquake,which is not conducive to the structure's earthquake resistance.In order to study the influence of f 3 ground fissures on the dynamic response of the conjoined structure in the action of earthquake,this paper established the soil-structure coupling model for the f 3 ground fissure site and without ground fissure site by using the ABAQUS finite element software,compared and analyzed the displacement,acceleration and torsion response of the structure in the action of earthquake.The results show that ground fissures enhance the seismic excitation and the dynamic response of conjoined structures since the distance between each column base in the large area and the ground crack is different,so the torsional response in the region is significantly improved,with an increase of 191.61%.The maximum inter story displacement angles of the connected structure in the elastic stage and the elastic-plastic stage are 1/580 and 1/51,which meet the requirements of the seismic code.The translational coupling effect of large triangle and small triangle is obvious,with their displacement and acceleration roughly the same.The sliding bearing of long-span truss corridor can effectively release the relative displacement of the connected structure and reduce the torsional coupling effect of large area and small triangle area under strong earthquake.The weak floors of the conjoined structure are 1 and 2,so it is suggested to taking some measures to improve the structural stiffness.

关 键 词：地裂缝 不规则连体结构 动力响应 层间位移角 大跨桁架连廊 

分 类 号：TU375.4[建筑科学—结构工程]