该文利用欧拉多相流模型，对矩形断面和准流线型断面的桥梁主梁进行了三维风驱雨数值模拟计算。通过计算，得到了桥梁主梁周围风雨流场的分布和主梁上雨滴平均冲击荷载分布，并重点探讨了降雨对桥梁主梁断面三分力系数的影响以及来流攻角和湍流强度的变化对风驱雨效应的影响。通过和相关风洞试验数据的比较，验证了欧拉多相流方法在桥梁工程风驱雨研究中的有效性和便利性，为桥梁工程风驱雨研究提供了一个新的手段。通过分析发现，降雨会影响桥梁主梁的三分力系数，但雨滴对主梁的平均冲击荷载相对于风荷载而言较小，影响并不显著；攻角和湍流强度的变化对风驱雨效应的影响亦不明显。

The Eulerian multiphase model was used for the numerical simulation of wind-driven rain (WDR) on bridge deck models of rectangular cross-section and streamline-liked section in this paper. Through numerical computation, the wind-driven rain field around bridge deck sections and rain-induced impact loads on bridge sectional surfaces were investigated. The emphasis was laid on the analysis of precipitation effect on the aerodynamic coefficients of bridge models. In the process of the analysis, the change of attack angle and the change of turbulence intensity of inlet were taken into account. By comparison with available experimental data, the reliability and flexibility of the WDR simulation approach based on the Eulerian multiphase model were verified. Furthermore, it is demonstrated that the present method is an effective tool for numerical evaluations of WDR in bridge engineering. After analysis and demonstration, it is shown that the raindrops have no obvious influence on the aerodynamic coefficients because the impact loads of raindrops acting on bridge surfaces are small. Moreover, the effects of attack angle and turbulence intensity on the results of WDR are limited.