摘要
福州地铁尚未建成时,需要对临近建筑物的振动响应进行预测。由此,建立车轨垂向耦合振动数值分析模型和隧道—土体—建筑物有限元模型,参考福州地铁振源参数及沿线典型II类场地土类型,对地铁运行后,临近建筑物的振动响应作出了理论预测。分析结果表明,地铁列车运行引发的环境振动主频以中高频振动为主,而建筑物各楼面峰值主频均为建筑物的自振频率。同时,在低层楼面存在激励振动的中高频反弹区。列车车速和单双线运行不影响建筑物的振动形态,但能显著影响楼面加速度振级。另外,当多层和小高层建筑至隧道中心水平距离小于10 m,高层建筑小于15 m及位于30 m左右处,车速超过40 km/h时,建筑物部分或全部楼层加速度振级可能超越相关规范规定的振动限值,需要考虑振动控制。
Two models were established for analyzing the vibration responses of buildings adjacent to Fuzhou Metro.One of them was for numerical analysis of vehicle-track coupled vertical vibration, and the other was the tunnel-soil-buildingcoupled model of 3D FEM. In reference of the vibration source parameter of Fuzhou metro and typical in-situ soil distributionof kind II along the Metro line, vibration responses of buildings adjacent to the Metro induced by the subway operationwere predicted. The results show that the vibration responses of the adjacent buildings are mainly the medium and highfrequency vibrations, and the dominant frequencies of the floors are the natural frequencies of the buildings. Meanwhile, inthe lower floors there exist medium-and- high frequency rebound areas due to the excitation. Speed and single- or- doubletrack traveling of trains have no influence on the vibration type of the buildings, but have significant effects on the vibrationacceleration level of the floors. When the horizontal distance from the multistoried or middle-highrise building to the centerlineof the subway are smaller than 10m, or the distance for highrise building is smaller than 15m, and the train speed exceeds40km/h, the vibration acceleration levels of the floors may exceed the standard vibration limit. In this case, measuresfor vibration control should be considered.
出处
《噪声与振动控制》
CSCD
2015年第1期176-181,共6页
Noise and Vibration Control
基金
国家自然科学基金资助项目(51108092)
关键词
振动与波
地铁运行
加速度振级
数值分析
vibration and wave
subway operation
vibration acceleration level
numerical analysis
