摘要
大跨度平屋盖表面的风压脉冲特性是屋盖风压脉动特性的一个重要表现形式,基于大跨度平屋盖结构的风洞试验研究,结合风压脉冲的形成机理及利用过界峰值法研究屋盖表面风压脉冲对风压脉动的贡献及其出现的频率和峰值的大小,并从中找出反映大跨度屋盖结构的风场绕流特性和风压脉动特性的一些规律。
Characteristic of wind pressure pulse is one of the most important behaviors of wind pressure fluctuation. Peak surface pressures measured on wind tunnel test models of long span flat roofs are discussed. The peak-over-threshold method is used to investigate the properties of wind pressures pulse events, which include peak duration, energy contribution, number of the peak events, and the distribution of average peak pressure. The results show that there existed strong non-Gaussian roof pressure in the flow separation region and that the amplitude of peak pressure events could reach four times of the average wind pressures. Some conclusions about the characteristics of wind fluctuating pressure are obtained from these results.
出处
《工程力学》
EI
CSCD
北大核心
2007年第4期92-96,共5页
Engineering Mechanics
基金
国家自然科学基金重点项目(50338010)
国家自然科学基金面上项目(50478028)
关键词
大跨度屋盖结构
风荷载
漩涡作用
风压脉冲
过界峰值法
long span roof
wind load
vortex mechanism
wind pressure pulse
peak-over-threshold method
