竖向基础隔振模型建筑在地铁激励下的振动响应研究  

Study on subway-induced vibration response of vertical base isolated model building

作　　者：李江宁[1] 张晖[2] 虞炜[2] 

机构地区：[1]同济大学结构工程与防灾研究所,上海200092 [2]上海建筑设计研究院有限公司,上海200041

出　　处：《建筑结构》2013年第13期27-30,共4页Building Structure

基　　金：上海市科学技术委员会科研项目(09dz1207800);上海市城乡建设和交通委员会科研项目(重科2010-002)

摘　　要：为研究采用竖向基础隔振技术的建筑在地铁激励下的响应,在上海地铁某线路隧道正上方制作了一个两层砖混结构房屋模型,采用橡胶支座与叠层橡胶滑板支座并联作为隔振层。建立了该房屋模型的有限元模型,通过不同型号和不同数量隔振支座的组合来改变隔振频率,以不同隔振工况下的实测基底振动加速度记录为输入激励,计算了结构在时域内的响应。将结构的时域响应转换为振动加速度级,评价了不同隔振频率的隔振效果,并与实测结果进行了比较。研究表明,建立的有限元模型能够较真实地反映地铁激励下基础隔振建筑物的振动响应,能够对地铁激励下拟建建筑的振动进行预测,为其隔振设计提供理论依据。To study the subway-induced vibration response of vertical base isolated structure,a two-story masonry model structure,equipped with rubber bearings and laminated rubber sliding bearings,was built above a subway tunnel in Shanghai.Finite element model of the structure was established.Different vibration isolation frequencies were obtained by using different types and different numbers of bearings.Time-domain vibration acceleration response of the model structure was obtained by the dynamic elastic finite element calculation of the model with the input acceleration which can be conveniently measured on the site ground.The vibration isolation performance was evaluated by converting the time-domain vibration acceleration response into vibration acceleration level.Calculated results were compared with the measurement results.Results show that the established finite element model can properly reflect the actual subway-induced building vibration and provide a basis for subway-induced vibration isolation design of buildings.

关 键 词：地铁振动 基础隔振 有限元模型 振动加速度级 

分 类 号：TU352.1[建筑科学—结构工程] TU317.1