大跨度双曲屋盖结构表面风驱雨压力分布研究

强风来临时常常伴有强降雨,雨滴在风荷载的作用下会对结构产生较大的撞击力,并产生了风驱雨作用,加剧了结构所受荷载。但荷载规范中对大跨度屋盖结构的抗风雨设计值尚未给出明确规定。本文采用数值模拟的欧拉-欧拉方法,研究了正方形、矩形、圆形、椭圆形等四种常见大跨度双曲屋盖表面在风驱雨作用下的平均压力分布,并与已有风荷载作用的风洞实验结果进行了对比。研究发现:风雨作用下最不利双曲屋盖投影形状为正方形,其次为矩形;在风雨联合作用下双曲屋盖表面平均压力受到雨压力、风吸力、风压力共同作用,且都是屋盖前端处平均压力系数较大,变化梯度较大。研究得到了不同双曲屋盖风驱雨作用下的平均压力系数及其变化规律,为类似结构的抗风雨设计提供了参考。

Study on wind-driven rain pressure of large span hyperbolic roof structures surfaces

Strong winds are often accompanied by heavy rainfall.Under the action of wind loads,raindrops will have a large impact force on the structures,resulting in wind-driven rain,which intensifies the load on the structures.However,the weather resistance design values for large-span roof structures have not been clearly specified in the load code.In this paper,the Euler-Euler method of numerical simulation is used to study the average pressure distribution under the action of wind-driven rain on the surfaces of four common large-span hyperbolic roofs,such as squares,rectangles,circles and ellipses.The wind tunnel experiment results are compared.The average pressure coefficient and variation law under the wind-driven rain of different hyperbolic roofs are studied,which provides a reference for the anti-wind and rain design of similar structures.