Damage Detection on Sudden Stiffness Reduction Based on Discrete Wavelet Transform

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	Damage Detection on Sudden Stiffness Reduction Based on Discrete Wavelet Transform
	Chen, Bo ; Chen, Zhi-wei ; Wang, Gan-jun ; Xie, Wei-ping ; Chen ZW(陈志为)
刊名	http://dx.doi.org/10.1155/2014/807620
	2014
关键词	HILBERT SPECTRUM STEEL BRIDGES DECOMPOSITION
英文摘要	National Natural Science Foundation of China [51178366, 51108395]; Technological Project of the Chinese Southern Power Grid Co. Ltd. [K-GD2013-0222]; Fundamental Research Funds for the Central Universities (WUT) [2013-II-015]; The sudden stiffness reduction in a structure may cause the signal discontinuity in the acceleration responses close to the damage location at the damage time instant. To this end, the damage detection on sudden stiffness reduction of building structures has been actively investigated in this study. The signal discontinuity of the structural acceleration responses of an example building is extracted based on the discrete wavelet transform. It is proved that the variation of the first level detail coefficients of the wavelet transform at damage instant is linearly proportional to the magnitude of the stiffness reduction. A new damage index is proposed and implemented to detect the damage time instant, location, and severity of a structure due to a sudden change of structural stiffness. Numerical simulation using a five-story shear building under different types of excitation is carried out to assess the effectiveness and reliability of the proposed damage index for the building at different damage levels. The sensitivity of the damage index to the intensity and frequency range of measurement noise is also investigated. The made observations demonstrate that the proposed damage index can accurately identify the sudden damage events if the noise intensity is limited.
语种	英语
出版者	HINDAWI PUBLISHING CORPORATION
内容类型	期刊论文
源URL	[http://dspace.xmu.edu.cn/handle/2288/90020]
专题	建筑土木－已发表论文
推荐引用方式 GB/T 7714	Chen, Bo,Chen, Zhi-wei,Wang, Gan-jun,et al. Damage Detection on Sudden Stiffness Reduction Based on Discrete Wavelet Transform[J]. http://dx.doi.org/10.1155/2014/807620,2014.
APA	Chen, Bo,Chen, Zhi-wei,Wang, Gan-jun,Xie, Wei-ping,&陈志为.(2014).Damage Detection on Sudden Stiffness Reduction Based on Discrete Wavelet Transform.http://dx.doi.org/10.1155/2014/807620.
MLA	Chen, Bo,et al."Damage Detection on Sudden Stiffness Reduction Based on Discrete Wavelet Transform".http://dx.doi.org/10.1155/2014/807620 (2014).