混凝土连续墙隔振后建筑结构的地铁振动实测与分析
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摘要
在一地铁沿线某建有地下连续墙的建筑物的地面及地下室对地铁运行引起的振动进行现场实测,通过所采集到的数据分析了相关测点之间的振动加速度的峰值衰减率、Fourier谱、Hilbert边际谱及振级等的变化,分别讨论了地下连续墙的隔振效果和经过隔振后的振动在墙后地下室各层的衰减情况.结果表明:连续墙对水平方向的振动有较为明显的隔振效果,对垂向未起到隔振作用;随着建筑进入地下深度的增加,地下室水平向的振动衰减程度增大;每一层地下室的垂向振动衰减很明显;地下室3个方向上的振级随着中心频率的增大而增大,随着建筑进入地下深度的增加其水平振级的衰减程度增大.
Field measurements were conducted on the ground and the basement floor of a building with underground continuous wall to investigate the subway-induced vibration.Then,the changes of acceleration peak attenuation rate,Fourier spectrum,Hilbert marginal spectrum and vibration level were analyzed according to the data obtained at the related measuring points.Finally,the vibration isolation effect of the continuous underground wall and the vibration attenuation on each floor of the basement wall with vibration isolation were discussed.The results show that the vibration isolation effect of continuous wall is obvious in horizontal direction but is rare in vertical direction,that the degree of horizontal vibration attenuation increases with the depth of underground construction,that the vertical vibration attenuation is obvious on each layer of the basement,that the vibration levels in the three directions all increase with the center frequency,and that the attenuation degree of horizontal vibration level increases with the depth of underground construction.
Field measurements were conducted on the ground and the basement floor of a building with underground continuous wall to investigate the subway-induced vibration.Then,the changes of acceleration peak attenuation rate,Fourier spectrum,Hilbert marginal spectrum and vibration level were analyzed according to the data obtained at the related measuring points.Finally,the vibration isolation effect of the continuous underground wall and the vibration attenuation on each floor of the basement wall with vibration isolation were discussed.The results show that the vibration isolation effect of continuous wall is obvious in horizontal direction but is rare in vertical direction,that the degree of horizontal vibration attenuation increases with the depth of underground construction,that the vertical vibration attenuation is obvious on each layer of the basement,that the vibration levels in the three directions all increase with the center frequency,and that the attenuation degree of horizontal vibration level increases with the depth of underground construction.
引文
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[2]Hao Hong,Ang T C,Shen Jay.Building vibration to tra-ffic-induced ground motion[J].Building and Environ-ment,2001,36(3):321-336.
[3]Kurzweil L G.Ground-borne noise and vibration from un-derground rail systems[J].Journal and Vibration,1979,66(3):363-370.
[4]夏禾,吴萱,于大明.城市轨道交通系统引起的环境振动问题[J].北方交通大学学报,1999,23(4):1-7.Xia He,Wu Xuan,Yu Da-ming.Environmental vibrationinduced by urban rail transit system[J].Journal ofNorthern Jiaotong University,1999,23(4):1-7.
[5]Adam M,Von Estorff O.Reduction of train-induced buil-ding vibration by open and filled trenches[J].Computersand Structures,2005,83(1):11-24.
[6]邱畅,高广运,岳中琦,等.屏障隔振系统失效机理的探讨[J].西北地震学报,2003,25(3):198-203.Qiu Chang,Gao Guang-yun,Yue Zhong-qi,et al.Researchon the failure mechanism of barrier for isolating vibration[J].Northwestern Seismological Journal,2003,25(3):198-203.
[7]周裕德,祝文英,应乐惇,等.地铁振动对上海音乐厅迁址影响分析及对策措施[C]∥全国环境神学电磁辐射环境学术会议论文集.北京:中国声学学会,2004:28-31.
[8]Kattis S E,Polyzos D,Beskos D E,Modelling of pile wavebarriers by effective trenches and their screening effective-ness[J].Soil Dynamics and Earthquake Engineering,1999,18(1):1-10.
[9]Yang Y B,Hung H H.A parametric study of wave barriersfor reduction of train-induced vibration[J].Int J NumerMeth Engng,1997,40(20):3729-3747.
[10]Andersen L,Nielsen S R K.Reduction of ground vibra-tion by means of barriers or soil improvement along arailway track[J].Soil Dynamics and Earthquake Engi-neering,2005,25(7):701-716.
[11]GB/T50355—2005,住宅建筑室内振动限值及其测量方法标准[S].
[12]朱玉星.地铁运行激励下土层振动的有限元分析与隔振研究[D].上海:同济大学土木工程学院,2007.
[13]楼梦麟,李守继,黄天立,等.地铁引起地面振动信号的谱分析[J].同济大学学报,2008,36(9):1160-1163,1175.Lou Meng-lin,Li Shou-ji,Huang Tian-li,et al.Spectralanalysis of subway-induced vibrations[J].Journal ofTongji University,2008,36(9):1160-1163,1175.
[14]丁洁民,王田友,申跃奎,等.不同振源影响下土层振动与建筑物隔振的研究现状[J].建筑结构,2006,36(S1):80-85.Ding Jie-min,Wang Tian-you,Shen Yue-kui,et al.Re-search state on soil vibration and building isolation sub-jected to various vibration sourse[J].Building Struc-ture,2006,36(S1):80-85.
[15]楼梦麟,李守继.地铁引起建筑物振动评价研究[J].振动与冲击,2006,26(8):68-71.Lou Meng-lin,Li Shou-ji.Evaluation of buildings’vibra-tion induced by underground trains[J].Journal of Vi-bration and Shock,2006,26(8):68-71.
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