基于小波包能量谱的大跨斜拉桥拉索损伤预警方法
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摘要
为了实现对大跨斜拉桥拉索损伤的有效预警,将小波包分析应用于结构损伤预警中.在基于小波包能量谱的结构损伤预警理论的基础上,提出了大跨斜拉桥拉索损伤的预警方法,并以润扬大桥斜拉桥为例,研究了这种方法的损伤适用性和损伤敏感性.数值分析结果表明,与频率等动力参数相比,采用基于小波包能量谱的结构损伤预警指标能更有效地发现大跨斜拉桥拉索的早期损伤,且通过对多测点损伤预警指标的分析与比较能初步实现拉索的损伤定位.可见,该结构损伤预警方法具有实用性,对结构损伤定位亦有帮助.
For the purpose of improving validity of cable damage alarming of longspan cable-stayed bridges,wavelet packet analysis is imported into structural damage alarming methods.On the basis of the structural damage alarming theory based on wavelet packet energy spectrum,the damage alarming method for cable damage of long-span cable-stayed bridges is put forward in this paper.Through the Runyang cable-stayed bridge,damage alarming capacity of the presented method is discussed in detail with respect to damage location and damage extent.The analysis results reveal that,compared with other dynamic parameters,such as frequency,initial cable damages can be detected more effectively and more efficiently by the damage alarming index based on wavelet packet energy spectrum,and determination of the cable damage location can be tentatively realized according to the comparisons of damage alarming indices measured in various locations.Therefore, the structural damage alarming method put forward in this paper is practical and helpful for structural damage localization.
For the purpose of improving validity of cable damage alarming of longspan cable-stayed bridges,wavelet packet analysis is imported into structural damage alarming methods.On the basis of the structural damage alarming theory based on wavelet packet energy spectrum,the damage alarming method for cable damage of long-span cable-stayed bridges is put forward in this paper.Through the Runyang cable-stayed bridge,damage alarming capacity of the presented method is discussed in detail with respect to damage location and damage extent.The analysis results reveal that,compared with other dynamic parameters,such as frequency,initial cable damages can be detected more effectively and more efficiently by the damage alarming index based on wavelet packet energy spectrum,and determination of the cable damage location can be tentatively realized according to the comparisons of damage alarming indices measured in various locations.Therefore, the structural damage alarming method put forward in this paper is practical and helpful for structural damage localization.
引文
[1]汪永兰.拉索损伤对斜拉桥结构性能影响研究[D].南京:东南大学土木工程学院,2004.
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[9]丁幼亮,李爱群,缪长青,等.大跨桥梁结构损伤诊断与安全评估的多尺度有限元模拟研究[J].地震工程与工程振动,2006,26(2):66-72.Ding Youliang,Li Aiqun,Miao Changqing,et al.Multi-level finite element modeling of long-span bridgesfor damage diagnosis and safety evaluation[J].SeismicEngineering and Engineering Vibration,2006,26(2):66-72.(in Chinese)
[10]丁幼亮,李爱群,缪长青,等.基于小波包能量谱的大跨桥梁结构损伤预警指标[J].中国公路学报,2006,19(5):34-40.Ding Youliang,Li Aiqun,Miao Changqing,et al.Structural damage alarming indices for long-span bridg-es based on wavelet packet energy spectrum[J].Chi-na Journal of Highway and Transport,2006,19(5):34-40.(in Chinese)
[2]余寿文,冯西桥.损伤力学[M].北京:清华大学出版社,1997.
[3]杨光松.损伤力学与复合材料损伤[M].北京:国防工业出版社,1995.
[4]王军.损伤力学的理论和应用[M].北京:科学出版社,1997.
[5]杨福生.小波变换的工程分析与应用[M].北京:科学出版社,2001.
[6]崔飞.桥梁参数识别与承载能力评估[D].上海:同济大学土木工程学院,2000.
[7]Sun Z,Chang C C.Structural damage assessment basedon wavelet packet transform[J].Journal of StructuralEngineering,2002,128(10):1354-1361.
[8]丁幼亮,李爱群,缪长青.基于小波包能量谱的结构损伤预警方法研究[J].工程力学,2006,23(8):42-48.Ding Youliang,Li Aiqun,Miao Changqing.Investiga-tion on the structural damage alarming method based onwavelet packet energy spectrum[J].Engineering Me-chanics,2006,23(8):42-48.(in Chinese)
[9]丁幼亮,李爱群,缪长青,等.大跨桥梁结构损伤诊断与安全评估的多尺度有限元模拟研究[J].地震工程与工程振动,2006,26(2):66-72.Ding Youliang,Li Aiqun,Miao Changqing,et al.Multi-level finite element modeling of long-span bridgesfor damage diagnosis and safety evaluation[J].SeismicEngineering and Engineering Vibration,2006,26(2):66-72.(in Chinese)
[10]丁幼亮,李爱群,缪长青,等.基于小波包能量谱的大跨桥梁结构损伤预警指标[J].中国公路学报,2006,19(5):34-40.Ding Youliang,Li Aiqun,Miao Changqing,et al.Structural damage alarming indices for long-span bridg-es based on wavelet packet energy spectrum[J].Chi-na Journal of Highway and Transport,2006,19(5):34-40.(in Chinese)
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