摘要
迄今为止,大跨度屋盖结构的风振系数均为上吸风引起的风振效应,对于某些情况是不安全的。针对国家体育场大跨度屋盖结构自重效应较大的特点,本文提出了大跨度屋盖下压风振系数的定义与合理的取值范围,提出了背景响应和共振响应的振型能量参与系数的计算方法和振型选取方法,利用振型叠加法分析了国家体育场屋盖结构的随机风振响应及风振系数,为国家体育场屋盖结构风振系数的确定提供了科学依据。
The gust factors for a large-span structure are conventionally concerned only with the upward-wind fluctuating response in Chinese Building Load Code. This may not be safe for design in some cases. According to the significant seffweight effect of the large-span roof of the National Stadium, the downward gust factors for both nodes and load panels are presented and their reasonable thresholds are suggested. The mode energy participation factors of both background response and resonate response are derived in this paper. The method of choosing modes in wind-induced response analysis is investigated. Then the wind fluctuating responses and gust response factors of the large-span roof of the National Stadium are analyzed. The calculated results are applied to the structural design of the National Stadium.
出处
《建筑结构学报》
EI
CAS
CSCD
北大核心
2007年第2期26-31,40,共7页
Journal of Building Structures
基金
国家科技攻关计划课题(2004BA904B01)
关键词
国家体育场
下压风振系数
振型能量参与系数
振型叠加
随机风振响应
位移风振系数
National Stadium
downward gust factor
mode energy participation factor
modes superposition
wind-induced response
gust response factor
