基于应变频响函数曲率的结构损伤识别  

Structural Damage Identification Based on SFRF Curvature

作　　者：姜增国[1] 张桢[2] 

机构地区：[1]武汉理工大学土木工程与建筑学院,湖北武汉430070 [2]新加坡国立大学土木工程系,新加坡119077

出　　处：《建筑科学与工程学报》2009年第4期40-43,共4页Journal of Architecture and Civil Engineering

基　　金：国家自然科学基金项目(50378074)

摘　　要：为了研究结构损伤并探索其损伤识别指标,基于多自由度体系频响函数,提出了以应变频响函数(SFRF)曲率作为损伤识别参数的结构损伤识别方法,并提出了结构损伤识别指标——SFRF曲率比。在此基础上采用有限元方法,进行了简支板单一损伤、多处损伤等多种工况的算例分析。结果表明:SFRF曲率比对损伤的敏感程度高于由振型、应变、频响函数(FRF)等推演出的特征指标;该方法可用于结构损伤定位以及定性评价多处损伤。To study structural damage and damage detection index, a structural damage method with strain frequency response function （SFRF） as damage detection parameter was presented. The structural damage index SFRF curvature ratio was presented. Based on the method, an example was analyzed under some conditions, such as simple-supported plane and multi-damage. The results show that the SFRF curvature ratio is sensitive to damage than the methods, such as modal shape, modal strain and FRF. The presented method can be applied to location of structural damages as well as identification of damage severity.

关 键 词：应变频响函数 曲率 测量噪声 结构损伤识别 振型 

分 类 号：TU312.3[建筑科学—结构工程]