考虑激励随机过程性的桥面行车安全可靠度分析

探讨脉动风和路面粗糙度的随机过程性对行车安全可靠度的影响，研究同时考虑平均风的随机性和脉动风的随机过程性的行车安全概率评价方法。采用经典动力可靠度理论分析随机过程性的影响。研究结果表明：侧风环境下桥面行驶汽车的支撑力响应是弱非平稳过程，可以采用经典动力可靠度理论研究行车安全可靠度。车速高时，随机过程性的影响较大；以桑塔纳为代表的小汽车受随机过程性的影响程度比箱式货车的大；随机过程性的影响程度还与动力可靠度曲线和平均风速概率密度函数的风速范围有关。

Reliability analysis for driving safety of a vehicle on a long-span bridge considering stochastic progress characteristics of excitation

The effects of the stochastic progress characteristics of turbulent wind and road roughness on driving safety reliability of a vehicle were discussed,and the evaluation method for safety probability of a vehicle driving on a bridge deck was studied considering the randomness of mean wind velocity as well as the stochastic progress characteristics of turbulent wind.The effects of the stochastic progress characteristics were analyzed with the classical dynamic reliability theory.The results showed that contacting forces of vehicle tires are weak non-stationary progress within lateral wind environment,so the classical dynamic reliability theory is applicable to safety reliability analysis of driving vehicles;the higher the driving speed,the more obvious the effect of the stochastic progress characteristics;driving reliability of a Santana representing small cars is influenced more than that of box-type truck by the stochastic progress characteristics;the level of the effect is relevant to the wind velocity range of dynamic reliability curve and that of probability density function of mean wind velocity.