地震作用下软土-隧道-地上框架体系非线性动力反应分析  

Nonlinear dynamic response analyses of a soft soil-tunnel-aboveground frame structure system under earthquake

作　　者：张季[1] 谭灿星 许开成[1] ZHANG Ji;TAN Canxing;XU Kaicheng(School of Civil Engineering and Architecture,East China Jiao-tong University,Nanchang 330013,China)

机构地区：[1]华东交通大学土木建筑学院,南昌330013

出　　处：《振动与冲击》2021年第12期159-167,共9页Journal of Vibration and Shock

基　　金：国家自然科学基金(52008170);江西省自然科学基金(20171BAB216049)。

摘　　要：地铁隧道往往紧邻地上建筑而建,地震作用下隧道、土、地上建筑间的动力相互作用对隧道或地上建筑抗震性能的影响是值得探究的课题。采用Abaqus有限元软件,建立软土-地铁隧道-地上钢筋混凝土框架结构弹塑性动力反应分析模型,综合考虑隧道与框架结构间距、隧道埋深、框架结构动力特性、输入波幅值等因素的影响,分析地震作用下隧道与地上建筑间的非线性动力相互作用规律。研究表明:①地上建筑将显著加重“下穿型”地铁隧道的地震损伤;②浅埋地铁隧道地震响应受地上建筑的影响较深埋隧道更大;③当隧道紧邻而非下穿地上框架且隧道与框架间距不大于50 m时,隧道衬砌结构的动力响应可能被放大,也可能被缩小;④地铁隧道对地上建筑地震响应的影响可以忽略。Subway tunnels are often built next to aboveground buildings,dynamic interaction between tunnels,soil and aboveground buildings under earthquake,which may exert effects on seismic performance of the tunnels or buildings,is worth exploring.In this paper,the Abaqus finite element software was used to establish an elastic-plastic dynamic response analysis model of a soft soil-tunnel-aboveground reinforced concrete frame structure,by taking distance between the tunnel and the frame structure,buried depth of the tunnel,dynamic characteristics of the frame structure,and amplitude of incident ground motion into account,law of nonlinear dynamic interaction between the tunnel and the aboveground building under seismic action was analyzed.It is revealed that:①aboveground building will significantly aggravate the earthquake damage of the underground tunnel;②the seismic response of shallow buried subway tunnel is more affected by aboveground building than that of deep buried tunnel;③when tunnel is adjacent to the aboveground frame but not underneath it,and the distance between tunnel and frame is no more than 50m,dynamic response of the tunnel lining may be amplified or de-amplified;④the influence of subway tunnel on seismic response of aboveground building can be ignored.

关 键 词：地铁隧道 地上框架结构 动力相互作用 非线性地震响应 

分 类 号：TU315.9[建筑科学—结构工程]