地铁列车振动对邻近综合体高层建筑的影响分析

Analysis on Influence of Subway Train Vibration on Adjacent High-rise Complex Buildings

目的研究城市轨道交通对邻近综合体高层建筑的振动影响,从而为以区域化、功能化为特征的大型综合体结构振动适用性设计提供合理评估方法。方法建立简化有限元模型,模拟地铁列车运行的振动荷载效应,考察地铁轨道中心与邻近综合体结构之间横向距离远近和不同结构总楼层高度对综合体结构的振动影响,分析综合体结构在地铁列车振动激励下的楼层振动响应及其相应的振动舒适度指标。结果对于结构竖向加速度反应而言,距离在10 m以内,结构竖向峰值加速度反应可达600 mm/s^(2)以上,而距离超过20 m,则衰减至300 mm/s^(2);在距离轨道中心20 m处,总楼层数为10层结构竖向峰值加速度可达到100 mm/s^(2),总楼层数为34层时,竖向峰值加速度可达到350 mm/s^(2)左右。结论依据ISO评价标准,可以采用有限元数值分析的方法,对尚处在设计阶段的综合体结构预先进行振动舒适度分析和评估,并适时地对“振动敏感区域”的建筑功能进行重新调整和分配,以规避可能发生的地铁振动干扰。

In this paper,the impact of urban rail transit vibration on adjacent high-rise complex buildings was studied,to provide a reasonable evaluation method for the vibration-applicability design of large-scale complex structures characterized by regionalization and functionalization,the simplified finite element model was established and the vibration load effect of subway train operation was simulated.The effects of the distance between the subway track center and the adjacent complex structure and the total floor height of different structures on the vibration of the complex structure was investigated.The floor vibration response of the complex structure under the vibration excitation of metro train and the corresponding vibration comfort index was analyzed.It is found that when the distance is less than 10 m,the vertical peak acceleration response of the structure can reach more than 600 mm/s^(2),when the distance is more than 20 m,it will decay to 300 mm/s^(2);At 20 m away from the track center,the vertical peak acceleration of the 10 storey structure can reach 100 mm/s^(2),and that of the 34 storey structure can reach 350 mm/s^(2).Meanwhile,according to the ISO evaluation standard,the method of finite element numerical analysis can be used to analyze and evaluate the vibration comfort of the complex structure that is still in the design stage,and timely readjust and allocate the building functions of the“vibration sensitive areas”,thereby avoiding possible interference from subway vibration.