体育场阶梯型悬挑屋盖风荷载数值模拟研究

Numerical simulation of wind-induced loads on ladder-type cantilevered roof of stadium

基于CFD数值模拟方法,采用RNG k-ε湍流模型对某体育场阶梯型悬挑屋盖风压进行了模拟研究。分析了屋盖风压分布特性及风向对风压的影响;并且考虑周边建筑对风场的扰动影响,引入风压系数干扰因子IF量化分析了周边建筑对体育场屋盖风压分布的气动干扰效应。结果表明:此类阶梯型大跨屋盖主要受风吸力作用,屋盖檐口、角部区域的风压系数量值较大;0°和180°风向角下平均风压随测点位置变化趋势大致相同,风压在台阶转折处发生突变;屋盖各区域的风载体型系数对风向角的敏感程度存在较大差异;周边建筑对屋盖风压主要起遮挡效应,对屋盖某些局部区域的风压起放大效应。

Based on the CFD numerical simulation method,the wind pressure on ladder-type cantilevered roof of a stadium is studied by using RNG k-εturbulence model.The wind pressure distribution characteristic and the influence of wind direction on wind pressure are analyzed with consideration of the interference effects of surrounding buildings on wind field.The pressure coefficient interference factor IF is introduced to quantify the aerodynamic interference effects of surrounding buildings on the wind pressure distribution of stadium roof.The results show that this ladder-type large span roof is mainly affected by wind suction,the values of wind pressure coefficient on eave and corner of roof are larger.For the measure points under 0°and 180°wind angle,the variation trend of mean wind pressure with the locations is basically the same and the wind pressure changes obviously at the bend of steps.The wind load shape coefficient of each of roof areas is different under various wind angles.The surrounding buildings have mainly a shielding effect on the wind pressure of stadium roof,and have an amplification effect on the wind pressure in some local areas of roof.