摘要
风荷载是控制大跨度钢屋盖结构设计的主要荷载之一。结合北京大学体育馆屋盖结构的风洞模拟试验,以屋盖上的平均风荷载和脉动风荷载为研究对象,对屋盖上的风荷载分布特性进行了详尽的分析。结果认为:整个屋盖所受风荷载主要以负压为主,屋盖悬挑部分在迎风时产生“上吸下顶”的叠加作用,其他风向为“上吸下吸”的抵消作用;屋盖角部的风荷载一般也很大,在结构设计时应采取必要的构造措施;脉动风荷载对于总的设计风荷载来说不能忽略,准定常理论不适合用来计算大跨度屋盖的风振响应。
The wind load is one of the main control loads for the large span steel roof structure. Based on wind tunnel investigation of Peking University gymnasium roof, the mean wind loading and fluctuating wind loading axe studied. The characteristics of wind load distribution are discussed. It shows that the suction is the main wind load on the whole roof. The wind pressures on the upper and lower surfaces of the cantilevered part of the roof have superimposing effects on the windward direction and counteracting effect on leeward direction. The wind-resistant measures must be taken at the comer of the roof for supporting the larger wind load. The fluctuating wind pressure can＇t be neglected as for the whole wind load, and the quasisteady theory can＇t be used to calculate the wind induced vibration response of the large span steel roof structure.
出处
《建筑结构》
CSCD
北大核心
2007年第2期114-117,共4页
Building Structure
关键词
大跨度屋盖结构
平均风压
脉动风压
large span roof structure
mean wind pressure
fluctuating wind pressure
