地铁列车振动对颐和园北宫门古建筑木结构影响的实测与分析
Measurement and analysis of the influence of metro train vibration on the ancient wooden structures of North Palace Gate of the Summer Palace
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摘要: 针对地铁运行对木结构古建筑的影响这一问题,本文以颐和园北宫门和北京市地铁 4 号线为研究对象,采用 ABAQUS 建立了列车?隧道?土层?木结构古建筑耦合模型。通过与现场实测结果对比,验证了有限元模型的精度, 并系统地研究了地铁运行时地铁线路与古建筑之间的夹角、列车速度对木结构古建筑振动的影响。结果表明:场地 地表与北宫门结构的振动强度的模拟结果与实测结果基本一致,实际工况下北宫门的振动响应满足限值要求;地铁 线路与临近木结构古建筑长轴方向夹角为 0°时,结构振动强度最大,且对于不同夹角,振动最强烈的均为距地铁线 路最近的结构柱;随着列车速度的增大,木结构古建筑的振动强度显著增大,与车速 60 km/h 时相比,车速为 80 km/h 时结构的振动幅度增加了 19.67%。Abstract: Based on the existing circumstances that the North Palace Gate of the Summer Palace and Beijing Rail Transit Line 4,this paper mainly discusses the influence of metro train vibration on ancient wooden structures. A train-tunnel-soil layer-building coupled model is established by ABAQUS, and the accuracy of the model is validated by comparison with field measurements.Horizontal vibration intensities are analyzed and the effects of angle and distance between subway lines and buildings, train speed and tunnel depth on ancient wooden structures are summarized. The results show that the structural vibration intensity becomes largest when the subway line is coincident with the long axis of the ancient timber structure. The structural column closest to the subway line exhibits the strongest vibration for various angles. The vibration intensity of buildings increases significantly as the train speed increases, with the vibration amplitude increasing by 19.67% for 80 km/h in comparison to the case of 60 km/h. The embedded depth of the tunnel is suggested as deep as possible when the location of the subway line cannot be changed.