地铁振动对既有砌体结构影响规律及因素数值分析

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。

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

Based on one masonry structures in Shanghai adjacent to the subway，setted up a detailed numerical model. The measured vibration acceleration was carried out to be the input excitation and model parameters was calibrated by the measured vibration response. Through numerical analysis , Study on variation regularity of vibration with the floor, the same floor in different floor structure, different room size and other factors had an effect on the vibration response distribution. The results show that: when the subway passed, the vertical vibration at larger mid-span was 1~3dB higher than the corner of walls. The vertical vibration arrangement of precasted slab room was greater than the castplate room. The vertical vibration at the ash between the precasted slabs, had a certain amplification effect；the room depth parameters had a small effect on the vibration, can be neglected；the relationship with the room depth and the vibration intensity related with the size of the width and depth of the room. the width of room had a big effect on the vertical vibration, the bigger of the width of the room, the higher of the vibration. vibration intensity has great relationship with floor corner and the surrounding constraint conditions.