摘要
以北京某地铁线路下穿复合地基高层办公楼建筑为研究背景,建立隧道-地层-建筑三维动力有限元预测模型,利用基于无限周期理论的车辆-轨道耦合动力学模型求解列车动力荷载。考虑普通整体道床和钢弹簧浮置板道床两种轨道工况,计算分析并结合规范评价两种工况下建筑室内的振动响应,并得到采用钢弹簧浮置板轨道时的插入损失以评价减振措施效果。分析结果表明:普通轨道工况下建筑物室内振动主要频率在10 Hz至60 Hz;浮置板轨道工况下建筑物室内振动频率在0至20 Hz;浮置板轨道的减振效果随楼层增加有一定的增强,最大Z振级插入损失为2.2 dB至12.4 dB;在中心频率大于20 Hz时,分频振级插入损失为10 dB至31 dB,减振效果明显。
Recently,an underground metro line was designed and to be constructed beneath a high-rise office building on composite foundation in Beijing.To predict and evaluate train-induced vibration inside the building,a dynamic tunnelsoil-building coupled 3D finite element model was established.The dynamic train loads were obtained by adopting a vehicletrack model based on infinite-periodic theory.Two kinds of track case,regular slab track and floating slab track(FST)with steel spring,were considered.Dynamic responses were calculated and evaluated based on the relative codes.Finally,the insertion loss(IL)of FST was obtained to evaluate vibration mitigation effect.The results indicated that the dominant frequency of the floor vibration was between 10 Hz to 60 Hz for the regular slab track case,whereas it was below 20 Hz for the FST case.The mitigation effect of FST was more obvious in the upper floor.The IL of the index VLz,max was between 2.2 dB and 12.4 dB.When the central frequency was above 20 Hz,the IL of the index VLmax was between 10 dB and 31 dB,showing that adopting FST in the metro line would obviously mitigate the train-induced vibration inside the building.
作者
包碧玉
徐利辉
熊义磊
李名淦
BAO Biyu;XU Lihui;XIONG Yilei;LI Minggan(School of Urban Construction,Beijing City University,Beijing 100083,China;School of Civil Engineering,Beijing Jiaotong University,Beijing 100044,China;Beijing Municipal Engineering Design and Research Institute Co.,Ltd.,Beijing 100082,China)
出处
《噪声与振动控制》
CSCD
2020年第6期215-221,共7页
Noise and Vibration Control
关键词
振动与波
地铁
环境振动
有限元分析
浮置板轨道
减振效果
vibration and wave
metro
environmental vibration
finite element analysis
floating slab track
vibration mitigation effect
