地铁振动对既有砌体结构影响规律及因素数值分析  

Numerical analysis on metro train-induced vibrations and their influences and affecting factors on existing masonry building

作　　者：夏倩[1] 屈文俊[1] 

机构地区：[1]同济大学建筑工程系,上海200092

出　　处：《振动与冲击》2014年第6期189-194,200,共7页Journal of Vibration and Shock

基　　金：十一五国家科技支撑计划项目资助(2006BAJ03A07-04)

摘　　要：以上海某地铁线路邻近砌体结构为研究对象，建立详细数值模型。以楼外实测振动加速度为输入激励，实测室内振动响应校核模型参数。通过数值分析，研究振动随楼层变化规律及同楼层内不同楼板结构、不同房间大小等因素对振动响应分布规律影响。结果表明，列车经过时较大跨度的室内楼板中央竖向振级较楼板墙边振级大1#3 dB；预制板房间竖向振动强度大于现浇板房间，预制板间灰缝处对振动强度有一定放大作用；房间进深参量对振动强度影响较小可忽略不计，进深与振动强度大小关系与进深尺寸及开间尺寸大小有关；开间参数对竖向振动影响较大，开间越大，振动强度越大；振动强度与楼板角部及周边约束情况关系密切。A detailed numerical model for a masonry structure in Shanghai adjacent to the subway was set up.The vibration acceleration measured at the outsider of the structure was taken as the input excitation and the model parameters were calibrated in the light of the measured vibration responses.Through numerical analysis,the variation of vibration on different floors was inspected and the effects of floor structure,room size and other factors on the vibration response distribution were discussed.The results show that：during the passing of metro train,the vertical vibration at larger mid-span is 1 #3 dB higher than at the corner of walls.The vertical vibration of the precasted slab room is greater than that of the castplate room.The ash seam between precasted slabs has a certain amplification effect on the vertical vibration;the room depth parameters have a small effect on the vibration,that can be neglected;the relationship between the room depth and the vibration intensity is concerned with the size of the width and depth of the room;the room width has a big effect on the vertical vibration,the bigger the room width,the higher the vibration;close relationship exists between the vibration intensity and the constraint conditions at the floor corner and the surrounding.

关 键 词：地铁振动 砌体结构 数值模拟 振动分布特性 板材特性 楼板角部及周边约束 

分 类 号：TB533.2[理学—物理]