大跨波浪型低层悬挑屋面风洞试验研究

Wind Tunnel Test of Long-span Waviness Overhang Roof

通过对某文体中心大跨波浪型悬挑屋面的风洞试验研究,讨论了屋檐及大跨围廊悬挑、波浪型屋面的风荷载特性,详细分析了悬挑位置、屋面形状以及风向角等因素对风荷载的影响。试验研究表明,该建筑的流线型外形有利于结构的整体抗风,屋盖大部分区域的风荷载分布类似于平屋面,因此可按规范取值;悬挑围廊由于后部墙体的遮蔽,其上的风荷载比原先设想的要小;悬挑围廊的个别部位存在“兜风”现象,导致该区域风荷载非常大,设计时需引起注意。

Wind tunnel test of long-span waviness overhang roof is carried out. The wind load characteristics of eaves, longspan overhanging and wave shape roof structure are discussed. The influences of the position of the overhang, the shape of the roof structure and wind directions on wind loads are also analyzed. The test results show that hydrodynamic form configuration is of greatly benefit for the wind resistance. The distribution of wind pressure on the majority area of the roof is similar to that of flat roof structure. Therefore, the wind pressure coefficient can be obtained from codes. The wind load on the overhanging is smaller than formerly assumption because of the shelter from the wall. The ＂catch the wind＂ phenomena exists at some regions which could cause large wind pressure and should be paid attention to.