基于模态扩阶法的结构损伤识别方法应用研究  

Applied Research of Structural Damage Identification Based on Modal Expansion Method

作　　者：肖烨[1] 范亚坤[2] 易萍华[1] 

机构地区：[1]东华理工大学土木与环境工程学院,江西抚州344000 [2]南昌航空大学土木与建筑学院,南昌330063

出　　处：《建筑科学》2011年第7期62-64,49,共4页Building Science

基　　金：东华理工大学校长基金项目(DHXK1008)

摘　　要：动力参数法诊断结构损伤时往往需要完整的自由度信息,而在实际工程中很难测量到结构的全部自由度信息。以一钢筋混凝土简支梁为例,通过模态扩阶法将实测的不完备信息扩充到完备的实测信息,使理论自由度与实测自由度相匹配,在此基础上用振型转角差法和模态应变能法对该简支梁结构进行损伤识别。结果表明利用振型转角差法和模态应变能法均较好地实现了测试信息不完备情况下的结构损伤识别,另当相邻单元存在损伤时,模态应变能法比振型转角差法具有更好的识别能力和实用价值。Complete degrees of freedoms（DOFS） information are needed when detecting structural damages by using dynamic parameter methods,but all of the structure DOFS are measured difficultly in practical engineering.Taking a reinforced concrete simply supported beam for example,the incomplete measured information is expanded to complete measured information by modal expansion for the sake of matching between the theoretical and measured DOFS.On this basis,mode shape rotation difference and modal strain energy methods are used to the damage identification of the simply supported beam.The results show that the structural damage identification under the incomplete measurement information realized by using the mode shape rotation difference and modal strain energy method;on the other hand,when the damages of adjacent elements exist,the modal strain energy method has a better recognition ability and practical value.

关 键 词：模态扩阶 不完备信息 简支梁 振型转角差 模态应变能 损伤识别 

分 类 号：TU311.3[建筑科学—结构工程]