摘要
气动导数是大跨桥梁结构颤振和抖振分析中确定颤振临界风速和抖振响应的重要依据。在实际中 ,强风(特别是台风 )一般总伴随着暴雨。但遗憾的是 ,目前所有的研究均是在均匀风场或紊流风场中识别气动导数 ,而没有考虑暴雨的作用。本文采用随机系统识别方法 ,在模拟的风雨共同作用条件下识别了薄平板模型的气动导数。初步研究结果表明 ,风雨共同作用下平板结构的气动导数明显不同于仅有风作用的结果。
Flutter derivatives play very important roles for determining the flutter critical wind speed and buffeting responses of long-span bridges. In reality,strong wind, especially typhoon, is always accompanied by heavy rain. Unfortunately, little attention has been paid to the problem. In this paper, the flutter derivatives of a thin plate model under the simultaneous actions of wind and rain are identified by using the Covariance-Driven Stochastic Subspace Identification method. The identified flutter derivatives under conditions of wind with and without rains are compared,and evident differences have been found,which deserves serious attention from researchers and engineers.
出处
《土木工程学报》
EI
CSCD
北大核心
2004年第10期73-77,共5页
China Civil Engineering Journal
基金
国家自然科学基金 (50 1 780 4 9
50 32 1 0 0 3)
教育部"高等学校骨干教师资助计划"项目联合资助
关键词
薄平板
气动导数
风雨共同作用
风洞试验
thin plate
flutter derivatives
simultaneous action of wind and rain
wind tunnel test
