基于小波分析的网架结构杆单元损伤检测研究
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摘要
网架是以杆单元作为主要构件的结构,节点损伤信息无法反映损伤杆单元的真实位置。采用单元损伤信息作为杆单元损伤位置判定的参数,结合杆单元损伤前后的应变模态差,建立了杆单元应变模态损伤识别方法。损伤表现为信号局部特征的改变,而小波分析在时域和频域上都具有表征信号局部特征的能力,故将杆单元损伤前后应变模态差作为结构损伤指标,应用小波变换对网架损伤杆单元进行定位。将该方法应用于一个正放四角锥网架结构的杆单元损伤识别,结果表明,该方法在低阶模态下就能较准确地定位网架结构中单一或多个损伤的位置。
Link elements are the main components of grid structure,while the damage information of nodes cannot reflect the real link element damage location.The damage information of link elements were adopted,and the difference of element strain modes of link element was considered as the damage parameter.Damage shows changes of local characteristics of the signal,while wavelet analysis can reflect local damage traits of the signal in time domain and frequency domain.Therefore,the damage location of link element can be located by the difference of element strain mode with wavelet transformation.A grid structure damage detection was analyzed by this method,and the results show that this method can be used to determine location of the single and more damages in the grid structure.
Link elements are the main components of grid structure,while the damage information of nodes cannot reflect the real link element damage location.The damage information of link elements were adopted,and the difference of element strain modes of link element was considered as the damage parameter.Damage shows changes of local characteristics of the signal,while wavelet analysis can reflect local damage traits of the signal in time domain and frequency domain.Therefore,the damage location of link element can be located by the difference of element strain mode with wavelet transformation.A grid structure damage detection was analyzed by this method,and the results show that this method can be used to determine location of the single and more damages in the grid structure.
引文
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[12]李永梅,高向宇,史升炎,等.基于单元应变模态差的网架结构损伤诊断研究[J].建筑结构学报,2009,30(3):152-159.
[13]沈祖炎,陈扬骥.网架与网壳[M].上海:同济大学出版社,1997:174-176.
[14]张悦.基于小波分析的正放四角锥网架结构损伤检测数值模拟研究[D].石家庄:河北科技大学,2010.
[2]雷宏刚.钢结构事故分析与处理[M].北京:中国建材工业出版社,2003.
[3]张俊海.基于模态参数在损伤检测中的应用[D].西安:西安理工大学,2007.
[4]李军,于德栋,白会人.基于应变模态的结构损伤定位方法[J].世界地震工程,2007,23(1):104-109.
[5]PAKRASHI V,BASU B,O'CONNOR A.Structural damagedetection and calibration using a wavelet-kurtosis technique[J].Engineering Structures,2007,29(9):2097-2108.
[6]SIMI P VALSAN,SWARUP K S.Wavelet based transformerprotection using high frequency power directional signals[J].Electric Power Systems Research,2008,78(4):547-558.
[7]LAW S S,LI X Y,ZHU X Q,et al.Structural damage detectionfrom wavelet packet sensitivity[J].Engineering Structures,2005,27(9):1339-1348.
[8]SER-TONG QUEK,QUAN WANG,LIANG ZHANG,et al.Sensitivity analysis of crack detection in beams by wavelettechnique[J].International Journal of Mechanical Sciences,2001,43(12):2899-2910.
[9]HOU Z,NOORI M,R ST AMAND.Wavelet-based approach forstructural damage detection[J].J.Engrg Mech.,ASCE,2000,126(7):677-683.
[10]SUN Z,CHANG C C.Structural damage assessment based onwavelet packet transform[J].J.Struct.Engrg.,ASCE,2002,128(10):1354-1361.
[11]HAASE M,WIDJAJAKUSUMA J.Damage identification based onridges and maxima lines of the wavelet transform[J].Journal ofEngineering Science,2003,41(13-14):1423-1443.
[12]李永梅,高向宇,史升炎,等.基于单元应变模态差的网架结构损伤诊断研究[J].建筑结构学报,2009,30(3):152-159.
[13]沈祖炎,陈扬骥.网架与网壳[M].上海:同济大学出版社,1997:174-176.
[14]张悦.基于小波分析的正放四角锥网架结构损伤检测数值模拟研究[D].石家庄:河北科技大学,2010.
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