地铁车站上盖建筑振动传播规律分析

Analysis of Vibration Propagation Law of Subway Station Superstructure

以杭州某地铁线路车站为背景,选取车站附近典型低层(3层)和高层(16层)建筑结构,在不同楼层内结构柱和楼板位置处布置加速度传感器,获得了地铁车辆下穿上盖建筑不同楼层位置处的振动实测时程数据,通过振动信号的频谱分析进一步获得了不同柱、板位置处振动响应的频谱和1/3倍频程。通过时-频分析研究了地铁车站附近低层和高层上盖建筑中波动传递与衰减规律,同时结合板、柱振动测量数据,采用不同的振动评价规范(GB 10071—1988和JGJ/T 170—2009)对上盖建筑结构振动进行评价分析,获得了振动评价规范间的差异。研究结果表明:车致建筑结构柱和板的振动随着楼层的升高先增大再减小最后出现增大;振动波在结构顶层由于入射和反射叠加存在振动放大效应,特别是高层建筑更为明显;在同样振动水平下JGJ/T 170—2009规范较GB 10071—1988规范更为严苛。

This paper conducted a vibration propagation analysis on two typical buildings near a subway station,including a three-storey low-rise building and a 16-storey high-rise building,which were selected as the research objects based on a certain Hangzhou metro line.Vibration acceleration sensors were deployed at structural columns and floorslabs on different floors,which to obtain real-time measured vibration signal and time history data.Spectral analysis was performed on the vibration signal,and the test results were expressed in the frequency domain and one-third octave domain.Then,the vibration propagation and attenuation law of low-rise and high-rise buildings caused by the underground trains were systematically explored.Finally,two standards(GB 10071-1988 and JGJ/T 170-2009)were used to calculate the vibration level,and the differences in the results between the two standards were compared.The results show that the vibration in columns and slabs caused by the underground trains increases first and then decreases to a certain extent and then increases again with the increasing floor.The vibration wave shows an amplification effect at the top-level of the building,due to the overlay of incident and reflected waves,which is more obvious in the high-rise building.Additionally,JGJ/T 170-2009 has more stringent requirements than GB 10071-1988 for the same vibration response.