侧风对桥面车辆转弯安全性的影响分析∗

摘要

In order to analyze the effects of side wind on the safety of vehicles traveling on the curve sections of bridges,under the combined effects of vehicle types,road conditions,vehicle speed and wind speed,the force applied to vehicles are studied to develop a limit equilibrium equation.According to the observed data from a cable-stayed bridge in China,critical wind speed is calculated at various vehicle speeds for maintaining a safe vehicle operation.Results show that as vehicle speed increases,critical wind speed increases slightly within a certain range,then descends.Such result contrasts to previous studies which commonly believe that critical wind speed decreases with increasing vehicle speed.To further study this paradox,the relationship between vehicle speed and critical wind speed is analyzed,and the distribution range of the corresponding vehicle speed is calculated when the above paradox occurs.The conclusions from this study are helpful for presenting a comprehensive understanding of the effects of side wind on vehicle safety,and to maintain a safe operation of the bridges.%针对桥面弯道处车辆的受力状况，综合考虑车辆类型、道路条件、车速和风速的影响，建立安全行车的极限平衡方程。在此基础上，结合某斜拉桥相关数据，计算不同车速下安全行车的临界风速，结果表明，安全行车临界风速随车速的增加先增加后减小，这一变化与通常认为的车速越大临界风速越小相违背。为验证悖论现象是否合理，论文研究了车速和临界风速的变化关系，并结合具体案例计算悖论现象发生时的车速分布区间，以全面理解侧风对桥面安全行车的不同影响，保障桥梁的安全运营。