摘要
车辆从人行天桥下面通过时会由于气流的运动而使人行天桥产生振动,在一定条件下,这种振动对人行天桥的影响是不容忽视的,其振动激励可利用FLUENT软件进行三维瞬态分析得到.通过截取沿着车辆行进方向车辆中心所在的纵剖面可得到人行天桥振动激励的大小、峰值情况及纵向分布规律,这一规律与二维模型的分析相对比,可得出各自的适用范围.通过截取沿人行天桥桥长方向的横剖面,可得到振动激励的横向分布规律.这一结论可为进一步计算人行天桥在追风效应下的振动响应做准备.
Movement of airflow can make foot bridge vibrate when vehicle passes under the footbridge. Under certain conditions, the vibration influence on footbridge is not ignorable. Its vibration excitation can be got though conducting three-dimensional transient analysis by FLUENT software. Along the direction of vehicle moving to intercept longitudinal section where is vehicle center, it can get the size, peak condition and vertical distribution law of vibration excitation on footbridge. Comparised with the analysis results of two-dimensional model, the respective application range is drawn. Along the direction of footbridge length to intercept cross section, it can get the lateral distribution law of vibration excitation. This conclusion can provide reference for further calculating vibration response of footbridge under the aerodynamic effect.
出处
《空间结构》
CSCD
北大核心
2013年第4期34-39,73,共7页
Spatial Structures
基金
北京工业大学城市与工程安全减灾省部共建教育部重点实验室资助
关键词
人行天桥
追风效应
振动激励
分布规律
foot bridge
aerodynamic effect
vibration excitation
distribution law
