风雪共同作用下大跨度双曲屋盖数值模拟研究

Numerical simulation of large-span hyperbolic roofs under the combined action of wind and snow

“风致雪漂”运动可能会造成建筑物倒塌,威胁到人身财产安全,因此风雪的共同作用在设计大跨度结构时是不能忽略的。本研究采用欧拉-欧拉方法,基于k-kl-ω湍流模型,选择的大跨度双曲屋盖结构的投影形状有4种,分别为矩形、正方形、椭圆形以及圆形,研究在风雪流共同作用下风向角不同时这4种结构屋盖表面的风致积雪压力系数曲线图和积雪分布系数云图,并进行了对比分析,得到积雪分布规律。结果表明:风致雪漂作用下4种形状屋盖结构表面风致积雪压力系数比单独风作用下的平均压力系数大;4种屋盖结构表面的风致积雪压力系数最大值出现的位置不同;风向角对屋盖表面的风致积雪压力有很大影响,当风向角不同时,屋盖表面压力从大到小的排列顺序依次为矩形、椭圆形、正方形和圆形屋盖。

“Wind-induced snow drift”may cause the collapse of buildings,thus affecting people s property and personal safety.Therefore,the combined effect of wind and snow can not be ignored in the design of long-span structures.This paper is based on the mixture multiphase flow model and k-kl-ωmodel,using Euler-Euler method.Four kinds of large span hyperbolic roof structures with projection shapes of square,rectangular,circular and elliptical are selected as the model structures.When the wind direction angle is different,the curve of wind-induced snow pressure coefficient and snow distribution coefficient cloud map on the roof surface of the four structures under the combined action of wind and snow are studied.In addition,they are compared and analyzed.The results show that the wind-induced snow pressure coefficient of four roof structures under wind-induced snow drift is larger than that under single wind.The position of the maximum wind-induced snow pressure coefficient on the surface of the four roof structures is different.When the wind direction angle is different,the order of pressure on the roof surface from large to small is rectangular,elliptical,square and circular roof.