降阶模型及其在大跨度屋盖结构风振中的应用研究  

RESEARCH ON APPLICATION OF REDUCED ORDER MODEL IN WIND-INDUCED VIBRATION OF LONG-SPAN ROOF

作　　者：孙芳锦[1] 殷志祥[1] 曹启坤[1] 张大明[2] 

机构地区：[1]辽宁工程技术大学土建学院,辽宁阜新123000 [2]辽宁工程技术大学技术与经济学院,辽宁阜新123000

出　　处：《工程力学》2008年第6期128-132,139,共6页Engineering Mechanics

基　　金：辽宁省教育厅基金项目(202183391)

摘　　要：该文建立了一种适用于气弹系统中非线性结构的降阶模型及系统识别方法,并首次将结构降阶模型应用到大跨度屋盖风振结构模型的建立中。非线性结构采用降阶模型并通过高精度有限元模型的非线性系统识别来建立,该模型在结构的模态坐标中将应变能泛函表示为结构模态振幅的多项式函数,该多项式的系数由高精度有限元模型计算所得的模态和应变能信息确定。该方法对一大跨度屋盖的风振响应做了分析,计算结果与采用高精度模型所得结果和实验结果及用ANSYS计算结果进行了比较,结果符合良好。该文的结构降阶模型对于建立非线性结构模型是准确有效的。A reduced order model and the corresponding system identification method are presented for constructing nonlinear structural model in aerodynamic system. And for the first time it is applied to constructing nonlinear structural model in wind-induced vibration of long-span roof. Reduced order model is adopted for the nonlinear structure and it is established by system identification of a high fidelity finite element model. Strain energy functional of the system is expressed as a polynomial of the structure＇s modal amplitudes in modal coordinates. And the unknown coefficients of the polynomial are determined by modes and strain energy information calculated using a high fidelity finite element model. Wind-induced responses of a long-span roof are calculated using the proposed method. The results agree well with those obtained from the high fidelity finite element model and experiments. The current reduced order model is suitable for constructing nonlinear structural model.

关 键 词：大跨度屋盖风振 结构降阶模型 高精度有限元模型 非线性系统识别 应变能泛函 

分 类 号：TU311.3[建筑科学—结构工程]