中文摘要：

目前大跨度悬挑屋盖设计通常忽略结构的风驱雨压，而风驱雨压是造成该类结构破坏的重要原因之一，为此研究大跨度悬挑结构表面风驱雨压的分布规律．为克服欧拉一拉格朗日多相流模型只能得到物理层面相对值的缺点，采用欧拉-欧拉多相流模型，研究风速、雨强变化条件下，悬挑屋盖表面风驱雨平均压力分布规律，并与单独风荷载作用时的风压分布进行了对比；计算了风驱雨条件下屋盖上下表面的极限体型系数．总结分析了大跨度悬挑屋盖表面风驱雨压分布特征和规律．研究结果表明：悬挑屋盖的风驱雨压较单独风作用时增幅明显，压力增大1．1-2．18倍；极限暴雨雨强工况下较中度暴雨工况下压力增大1.07—1．24倍．因此建议在进行大跨度悬挑屋盖设计时应考虑风驱雨效应，适当增大安全指数．

英文摘要：

Currently long-span cantilever roof design usually ignores wind-driven rain pressure distribution characteristics of structure, which is one of the most important causes for the destruction of this type of structure. Pressure distribution on the surface of long-span cantilever structure under co-action of wind and rain is studied. Euler-Euler multiphase flow model is employed to overcome the disadvantage of only getting physical relative value by Euler-Lagrange of multiphase flow model. The average wind-driven rain pressure on the top surface of cantilever roof with different wind speed and wind rainfall intensity is studied, and is compared with wind pressure coefficients under wind loading. Limit coefficients on the top and bottom surface of roof under co-action of wind and rain are calculated. Wind-driven rain pressure distribution characteristics on the surface of long-span cantilever structure are summarized. The results show that the pressure of cantilever roof increase under combined loads of wind and rain increases 1.1 to 2.18 times compared with that under sole wind loading. The pressure increases 1.07 to 1.24 times at limit rain storm compared with that of medium rain storm. Safety index is suggested to increase appropriately in the wind-driven rain design of long-span cantilever roof.