风雨联合作用下风向对大跨度悬挑屋盖的压力分布影响研究

Study on the Wind Pressure Distribution of Long-span Cantilever Roof under the Combined Effect of Wind and Rain

强降雨通常伴有强风作用,风向成为影响结构表面压力分布的重要因素之一。目前大跨度挑檐屋盖设计基本只考虑垂直于结构表面的单独雨荷载作用,对风雨联合作用下建筑表面压力分布研究甚少。研究风雨联合作用下,不同风向对大跨度悬挑屋盖表面的压力分布影响特性。基于数值模拟平台,采用欧拉-欧拉方法,模拟得到了不同风向工况下大跨度悬挑屋盖结构表面平均压力分布规律,并研究得到了一次自然降雨过程中最不利抗风雨位置,对相应大跨度悬挑结构设计提出了有益参考。

Heavy rainfall is often accompanied by strong wind;wind direction is one of the important factors affecting the pressure distribution over a structure surface.The current large-span roof overhang design considers only single rain load perpendicular to the structure surface;however,research on the pressure distribution over building surfaces under the effect of wind-driven rain is limited.In this paper,the pressure distribution characteristics over the surface of a large span cantilever roof is studied considering different wind directions.Based on a numerical simulation platform,the average pressure distribution over the surface of a long-span cantilever roof structure is obtained under different wind conditions by using the Euler-Euler method.In addition,the most unfavorable position for wind resistance is also obtained in a natural rainfall process.The findings should provide beneficial references for the design of large span cantilever structures.