地铁运行诱发建筑物振动的竖向基础隔振现场模型试验分析  

Site model test analysis on vertical base isolation under subway-induced building vibrations

作　　者：张晖[1] 盛涛[2] 

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

出　　处：《建筑结构》2013年第13期22-26,共5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：地铁运行诱发建筑物的振动以竖向振动为主,而现阶段关于降低此类振动的基础隔振技术研究较少。在上海地铁某线路隧道上方制作了一个两层砖混结构的房屋模型,采用橡胶支座和叠层橡胶滑板支座并联作为隔振层。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。在对基础固定和不同隔振频率下模型的基础、一层及二层楼板的加速度现场实测的基础上,对比分析了模型的峰值加速度响应和峰值隔振率,研究了模型竖向振动的主要频率成分及其变化规律,从1/3倍频程分频振级的角度评价了不同隔振频率的隔振效果。研究结果表明,在适当的隔振频率下,地铁引发结构的竖向振动可以控制在满意的范围内,但过低的隔振频率会放大结构的低频振动,应加以注意。Subway-induced vibration is basically vertical vibration,which is rarely studied in the field of vertical base isolation.A two-story masonry model structure,which was built above a subway tunnel in Shanghai,was equipped with rubber bearings and laminated rubber sliding bearings.Different vibration isolation frequencies were obtained by using different types and different numbers of bearings.According to the vibration test data of the basement,the first floor and the second floor of the model under fixed base and different isolation frequency cases,the peak acceleration and isolation rate were compared,the main frequency components and their varying pattern were analyzed,and the vibration isolation performance was appraised in view of the 1/3 octave frequency vibration level.Results show that the subway-induced structural vertical vibration can be controlled effectively under certain isolation frequency,but it should be noticed that low isolation frequency will amplify low frequency vibration of the structure.

关 键 词：地铁振动 竖向隔振 现场模型试验 1 3倍频程分频振级 

分 类 号：TU352.1[建筑科学—结构工程] TU317.1