基于动静结合的桁架结构损伤识别研究
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摘要
相对位移模态而言应变模态在桁架结构损伤识别方面更具优势。基于动态和静态损伤识别指标,提出动静相结合的新识别指标。新指标具有动测法和静测法的优点,能够在一定程度上过滤掉非损伤单元的干扰,较单独使用动态指标和静态指标更准确、更具优势。通过对一桁架结构的单处损伤和多处损伤进行数值模拟,并分别使用动态、静态和动静结合的三种指标进行损伤识别效果的比较,表明新指标更具优越性。针对算例中不同类型的构件同时损伤时,应变差较小的构件不易识别的不足,提出了二次识别或多次识别的解决方法。
Compared with displacement mode,strain mode is better in steel truss damage detection.A new structural nondestructive detection indictor,a dynamic and static combining indictor is presented,which is based on dynamic indictor and static indictor.The new indictor has advantages of method of dynamic and static.It can filter much effect of non-damaged elements.It is much exact than only used dynamic and static indictor for damage detection.Then its availability is verified through a steel truss numerical simulation,and by comparing with dynamic and static detection indictors.The result shows that new indictor is the best.Furthermore,the second-detection and repeated detection methods are presented to solve shortcoming of little strain is difficult to detect in different kinds of components' damage in numerical example.
Compared with displacement mode,strain mode is better in steel truss damage detection.A new structural nondestructive detection indictor,a dynamic and static combining indictor is presented,which is based on dynamic indictor and static indictor.The new indictor has advantages of method of dynamic and static.It can filter much effect of non-damaged elements.It is much exact than only used dynamic and static indictor for damage detection.Then its availability is verified through a steel truss numerical simulation,and by comparing with dynamic and static detection indictors.The result shows that new indictor is the best.Furthermore,the second-detection and repeated detection methods are presented to solve shortcoming of little strain is difficult to detect in different kinds of components' damage in numerical example.
引文
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[2]陈孝珍,赵冰.基于静力测量数据的桥梁结构损伤定位研究[J].三峡大学学报,2006,28(5):404-408.
[3]崔飞,袁万城,史家钧.基于静态应变及位移模态测量的结构损伤识别方法[J].同济大学学报2,000,28(1):5-8.
[4]Hu N,Wang X,Hisao Fukunaga,et al.Structural DamageIdentification Using Static Test Data and Changes in Frequencies.Structural Engineering,2001(23):610-623.
[5]Hajela P,Soeiro F J.Structural Damage Detection Based on Staticand Modal Analysis.AIAA Journal,1989,28(6):1110-1115.
[6]王茂龙.结构损伤识别与模型更新方法研究[D].南京:东南大学,2003.
[7]李国东,郭迅,陈晗.用于结构健康诊断的动静结合法及其试验验证[J].世界地震工程,2009,25(4):59-63.
[8]Yao G C,Chang K C,Lee G C.Damage Diagnosis of SteelFrames Using Vibrational Signature Analysis[J].Journal ofEngineering Mechanics,ASCE,1992,118(9):1949-1961.
[9]杜永峰,邵云飞.基于应变模态的桁架结构损伤指标研究[J].甘肃科学学报,2007,19(3):127-130.
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