作　　者： ; ; ;

机构地区： 合肥工业大学

出　　处： 《土木工程学报》 2014年第9期94-100,共7页

摘　　要： 雨滴受风驱动斜向飘落形成风驱雨(WDR),雨滴撞击建筑墙面将产生雨压荷载。考虑极端气候降雨频繁出现及其对建筑影响的加剧,有必要开展WDR雨压荷载的研究。基于欧拉-欧拉多相流模型,以雨滴谱及雨滴降落末速度拟合的雨相体积分数,以及依据力平衡条件确定的雨滴速度作为雨相入口边界,采用Realizable k-ε湍流模型封闭求解N-S方程,利用此WDR模拟新方法对单体多、高层建筑及特定群体建筑WDR场进行模拟,分析掌握迎风面WDR雨压分布特性及其受风速、雨强影响的规律与特点,通过比较迎风面最大WDR雨压与相应纯风压的量值,揭示单体与群体建筑WDR雨压荷载的作用程度。结果表明,设计工程结构尤其是覆面结构时,应考虑极端气候下WDR雨压所引起的荷载作用。 Wind-driven rain( WDR) is a phenomenon of wind-driven oblique raindrop movement. The buildings in WDR are affected by rain pressure due to raindrop impact on the facades. In view of frequently occurred extreme rainfall events and its increased impact on buildings,it is necessary to study rain pressure load of WDR. Based on Euler-Euler multiphase flow model,the rain-phase inlet boundary conditions were defined by the volume fraction of raindrop which was fitted with raindrop spectrum and raindrop terminal velocity,as well as by the raindrop velocity determined by the force equilibrium. Navier-Stokes equation may be solved by the realizable k-ε turbulence model to compute WDR field.With the new numerical method,WDR fields around single multi-story buildings,high-rise buildings and specific building complex were simulated. Distribution feature of WDR pressure applied on windward facades and its changing laws due to wind velocity and rain intensity were studied. By comparing the maximum WDR pressure with the corresponding maximum pure wind pressure,the influential degrees of maximum WDR pressure applied on single building and building complex were revealed. The results show that attention should be paid to WDR pressure loads under extreme weather conditions when designing engineering structures,especially cladding structures.

关 键 词： 风驱雨压 欧拉 欧拉模型 风速 雨强 纯风作用

领　　域： [建筑科学]