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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.
Under certain conditions, the impact of such vibration on pedestrian bridge can not be ignored. The vibration excitation can be obtained by three-dimensional transient analysis using FLUENT software The size, peak value and longitudinal distribution of the vibration excitation of pedestrian bridge can be obtained by intercepting the longitudinal section of the vehicle center along the traveling direction of the vehicle, which can be compared with the two - dimensional model analysis to get its own applicable scope. The lateral distribution of vibration excitation can be obtained by intercepting the cross section along the longitudinal direction of the pedestrian bridge.This conclusion can be used to further calculate the vibration response of the pedestrian bridge under the effect of the windward.