论文部分内容阅读
侧风作用下桥上通行车辆容易遭受行车安全问题。通过节段模型风洞试验,测试了主梁行车道位置上方一定高度范围内风场分布特性。基于车辆气动力和力矩等效的方法,采用等效风速和比例系数来考虑桥面气动绕流对车辆气动力特性的影响。在风-汽车-桥耦合振动研究的基础上,采用无量纲的侧倾和侧滑安全因子评价车辆的行车安全性,分析了风速和车速对不同类型车辆行车安全性的影响。结果表明:车辆的行车安全性随着风速和车速的增大而逐渐降低;桥面风场等效气动效应会降低集装箱车和旅行巴士的行车安全性,集装箱车RSF和SSF最大相对误差分别高达28.0%和184.3%。
Traffic on the bridge is vulnerable to driving safety problems due to crosswinds. Through the wind tunnel test of segment model, the distribution of wind field within a certain height above the driving lane of the main beam was tested. Based on the equivalent method of vehicle aerodynamic force and moment, the equivalent wind speed and proportional coefficient are used to consider the influence of the aerodynamic flow around the bridge deck on aerodynamic characteristics of the vehicle. Based on the wind-vehicle-bridge coupling vibration study, the vehicle safety is evaluated by dimensionless roll and slip factors, and the effect of wind speed and vehicle speed on the driving safety of different types of vehicles is analyzed. The results show that the driving safety of vehicles gradually decreases with the increase of wind speed and vehicle speed. The equivalent aerodynamic effect of deck wind farm will reduce the driving safety of container trucks and traveling buses. The maximum relative errors of container trucks and SSFs are up to 28.0% and 184.3%.