风汽车桥梁系统耦合振动及行车安全性分析

强风不仅是长大桥梁设计的控制性因素,而且直接影响到桥上车辆的运行安全。将自然风、公路车辆、桥梁作为一个统一的相互作用系统,在风-汽车-桥梁系统耦合振动分析的基础上,针对车辆侧倾事故和侧滑事故的评判准则,采用概率统计方法提高了风致车辆事故分析的可靠性。结合工程实例对强风作用下桥梁的动力响应和车辆的运行安全性进行了分析。计算得到了给定的车速条件下厢式货车的侧倾临界风速及干、湿、雪、冰四种路况情况下的侧滑临界风速,提出了适用于交通安全策略管理的强风天气条件下桥上车辆限速标准。

WIND-VEHICLE-BRIDGE SYSTEM COUPLING VIBRATION AND TRAFFIC SAFETY ANALYSIS

Strong wind not only controls the design of long span bridges,but also directly affects the traffic safety of vehicles on the bridges.Based on the coupled vibration analysis of a wind-road vehicles-bridge system,the wind-induced vehicle accident analysis is improved,since the probability of a statistical method was adopted in the criterion of vehicles side-lurch accidents and side slipping accidents.In the case study,the dynamic response of a bridge under strong wind was investigated,and the safety operation of vehicles was evaluated.The traffic critical wind speed of side-lurch and side-slipping for the moving vehicles at dry,wet,snow,ice road conditions were calculated,respectively.Accordingly,the vehicle speed limit at strong wind conditions is proposed for the management of traffic safety,.