框架结构模态参数识别时域方法的比较研究  

COMPARATIVE STUDY ON MODAL PARAMETER IDENTIFICATION TIME DOMAIN METHODS FOR FRAME STRUCTURE

作　　者：甘琳[1] 李海龙[2] 

机构地区：[1]重庆大学建设管理与房地产学院,重庆400045 [2]重庆大学土木工程学院,重庆400045

出　　处：《工业建筑》2013年第8期29-33,23,共6页Industrial Construction

基　　金：重庆市建设科技计划项目(2011-2-86;2011-2-80)

摘　　要：通过对4层钢框架模型试验得到环境激励下的位移响应,运用ITD、STD、复指数法、ERA、随机子空间法等5种时域方法来识别结构的模态参数,从而验证了5种方法在结构参数识别中应用的可行性。5种方法对频率的识别比较精准,对阻尼比的识别精度相对较差。通过与试验数据对比,同时对大量数据的处理发现,随机子空间法和ERA法对模态参数的识别最为精准,STD法和复指数法次之,ITD法的识别精度较差。Through a four-story steel frame model experiment under enviromental excitation,the displacement response of each measuring point was recorded,and five time domain methods（the ITD method,STD method,the complex index method,the ERA method and the stochastic subspace method） were used to identify the modal parameters.An acceptable and satisfying result shows that all the methods can be applied to the building structure.The 5 methods have higher precision for identifying frequency,and have relative lower precision for damping ratio.Compared with STD method and the complex index method,the Stochastic Subspace method and the ERA method have higher precision for identifying the model parameters,the ITD method has lower precision.

关 键 词：环境激励 钢框架结构 模态参数识别 模型试验 

分 类 号：TU323.5[建筑科学—结构工程]