城市公路与高架路交通诱发建筑振动实测与分析

In Situ Experiment and Analysis of Building Vibration Induced by Urban Road and Elevated Road Transit

为了研究环境振动对建筑物的影响及其在结构中传播的规律性,对某市公路与高架路及其沿线建筑物进行了实测,并从加速度时程、频谱与振级多个方面进行分析可知:由城市公路、高架路引起的地面振动分别以5～25 Hz、5～45 Hz的低频振动为主,这种低频振动在土层中随着距离的增加而衰减,传入建筑结构中会随着楼层的增加而放大,并且会诱发建筑结构内部构件的高频振动;在多层建筑结构内部,竖向振动大于水平振动,水平垂桥向振动大于水平顺桥向振动.随着楼层的增加,振动不断放大,放大倍数与结构在该方向上的刚度有关.结构的受迫振动主要源于地表振动.

The purpose of this paper is to study the environmental vibration effects on the adjacent buildings and the promulgation regulation of vibration in structure. An in situ experiment was carried out to measure the vibration acceleration of the urban road, elevated road and buildings and analyzed from multi-aspects as. the acceleration time history, frequency spectrum and vibration level. Results show that vibrations induced by urban road and elevated road are separately focused on 5- 25 Hz and 5- 45 Hz, which attenuate in soil with the increase of distance and amplify in the building with the rise of floor and may induce high frequency vibration of local components in structure. Inside multi-story building, the vertical vibration is stronger than the horizontal, and the latitude horizontal vibration is stronger than the longitude horizontal. The vibration amplifies with the rise of floor and the amplified multiple is according to the structure stiffness in that direction. The forced vibration of structure mainly comes from the ground surface motion.