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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.
The dynamic analysis model of vehicle-track-tunnel-soil-building system is used to calculate and analyze the influencing factors of the vibration of building structure.The results show that the main vibration source area of the building is vertical vibration and the vertical vibration The acceleration peak is about 1.6 times of the horizontal; the position of the building structure constraint changes prone to sudden changes; the impact of the opening size on the structure vibration is mainly reflected in the main frequency of vibration; Hz. The sensitivity of building structure to train speed decreases with the increase of external constraints. Reducing the vehicle speed can effectively reduce the vibration level of the near-source region of buildings.