立足于海上多跨连续刚构桥，研究其在海上风 － 浪联合作用及不利的车辆布载影响下的可靠性能和设计表达式． 从随机理论的角度出发，将作用于跨海连续刚构桥的汽车、风、浪作用简化为泊松过程，在采用 Ferry Borges-Castanheta(简称 FBC)法组合时进一步假设其为 FBC 过程． 其中涉及的风、浪、车均为极端情况，风 － 浪作用组合时考虑两者的相关性，汽车作用的极端性体现在它的布置而非其荷载的大小上． 为了确定极端风 － 浪作用影响下的跨海连续刚构桥设计表达式，采用思路步骤相对简单、主要依赖于计算机数据处理的 Monte-Carlo 方法进行模拟计算，根据结构可靠度指标与目标可靠度指标之差平方和为最小的原则，得出最佳设计分项系数．

In this paper,the reliable performance and design expression of a cross-sea multi-span continuous rigid frame bridge are investigated under the combined effect of the wind-wave and the adverse effect of the vehicle.Then,based on the stochastic theory,the vehicle,wind and wave actions on the cross-sea continuous rigid frame bridge are simplified as a Poisson process,and are further assumed as a FBC process when the Ferry Borges-Cas- tanheta (FBC) method is adopted.All the wind,wave and vehicle actions are considered to be in extreme cases,and when the wind and wave actions are combined，their correlation is also taken into account.Moreover,the ex- treme nature of the vehicle is reflected in the load layout rather than in the load value.In order to determine the de- sign expression of the cross-sea continuous rigid frame bridge under the extreme wind-wave effect,the Monte-Carlo method,which is simple and mainly dependent on the computer data processing,is adopted to perform a simula- tion.Finally,according to the principle of keeping the sum of the squares of the differences between the structural reliability indexes and the target reliability indexes to a minimum,the optimal design partial safety factor is obtained.