基于能量的大跨屋盖结构共振响应模态耦合效应分析  

MODAL COUPLING EFFECTS FOR WIND-INDUCED RESONANT RESPONSE OF LARGE-SPAN ROOF STRUCTURES

作　　者：李玉学[1] 杨庆山[1] 田玉基[1,2] 

机构地区：[1]北京交通大学土木建筑工程学院,北京100044 [2]华南理工大学亚热带建筑科学国家重点实验室,广州510640

出　　处：《工程力学》2010年第3期85-90,共6页Engineering Mechanics

基　　金：国家杰出青年科学基金项目(50725826);北京市自然科学基金项目(8072017);华南理工大学亚热带建筑科学国家重点实验室开放研究项目(2009KB19)

摘　　要：提出一种简单判别共振响应模态耦合效应的分析方法,该方法综合考虑结构的动力特性和风荷载特性,定义了共振响应模态耦合系数。依据该系数,通过几个特征参数(如结构模态和风荷载信息)就可以快捷的判断模态间共振响应耦合效应强弱,实现对共振响应耦合主导模态的选取。在此基础上,给出了大跨屋盖结构考虑模态间耦合效应的共振响应实用组合方法。最后,将该方法用于国家体育场屋盖结构风致动力响应分析,验证了其有效性。A method to judge the magnitude of resonant response modal coupling effects is proposed in this paper.It considers systematically the dynamic characteristics of the structure as well as the characteristics of wind load,and then the resonant response modal coupling coefficient is defined.Based on this coefficient,a few parameters with respect to fluctuating wind loads and structural modes are sufficient to estimate the magnitude of resonant response modal coupling effects,and then the dominant-coupling modes of resonant response are determined.On this basis,a practical method to combine resonant response is obtained,which considers the modal coupling effects availably.Finally,the effectiveness of the proposed method is verified by the analysis of wind-induced vibration response of Beijing National Stadium.

关 键 词：大跨屋盖 共振响应 模态耦合 主导模态 模态组合 

分 类 号：TU311.3[建筑科学—结构工程] TU318