过往车辆对人行天桥产生的追风效应原理及影响分析

Theory and Influence Analysis of the Aerodynamic Effect Produced Passing Vehicles on Footbridge

从流体力学的观点出发,建立车、桥及流场的二维网格模型,利用FLUENT软件对人行天桥受到过往车辆产生的气流影响进行受力分析及流场速度矢量分析,得出追风效应的产生原理,并总结了使人行天桥钢箱梁产生振动的直接原因.在此基础上,分析了不同车速、车型产生的追风效应对人行天桥的影响.

From the viewpoint of the fluid mechanics, establishing a two dimensional mesh model of vehicle and footbridge and flow field, air current influence produced by passing vehicles on footbridge has pressure and flow velocity vector analysis with FLUENT software, works out generation principle of aerodynamic effect, and summarizes the direct cause of vibration on the steel box girder of footbridge. On this basis, it analyzes the influences that the speed and the type of vehicles produce the aerodynamic effect on footbridge. It provides reliable basis for the further response analysis that passing vehicles produced vibration on footbridge girder through airflow movement.