轨道交通与建筑物共建体振动影响因素分析

采用车辆-轨道-隧道-土层-建筑物系统空间动力分析模型,对建筑结构的振动影响因素进行计算分析.结果表明:共建建筑物近振源区域以竖向振动为主,竖向振动加速度峰值约为水平向的1.6倍;共建建筑物结构约束变化位置振动易发生突变;开间尺寸对结构振动的影响主要体现在振动主频上;隧道基底的加固程度对共建结构1~5 Hz的低频振动影响较大;建筑结构的振级对列车速度的敏感性随外部约束的增强而减小,降低车速可有效地减小建筑物近振源区域振级.

Analysis on Influencing Factors of Vibration of Rail Transit building Integrated Structure

A vehicle track tunnel soil building spatial coupling model was proposed to analyze influencing factors of vibration of integrated structure, which is composed of intercity railway tunnel and big public building. The results show as follows: the vertical vibration is dominated in the nearby area of vibration source, and the vertical vibration acceleration amplitude is about 1.6 times of transverse vibration. The vibration intensity is more easily changed when the structure constraint condition alters. Room size has an effect on the dominant vibration frequency. The vibration of building structure changes with the stiffness of tunnel foundation, mainly in 1~5 Hz.The sensitivity of vibration level to velocity is lower when the structure constraint becomes stronger. The vibration in the nearby area of vibration source can be attenuated by decreasing velocity.