Damage detection strategy based on strain mode residual trends for Long-span cable-stayed Bridge

Zeng Xin;Xu Zhao-Dong

Journal of Vibration and Shock ›› 2013, Vol. 32 ›› Issue (7) : 78-81.

PDF(1057 KB)
PDF(1057 KB)
Journal of Vibration and Shock ›› 2013, Vol. 32 ›› Issue (7) : 78-81.
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Damage detection strategy based on strain mode residual trends for Long-span cable-stayed Bridge

  • Zeng Xin1,2, Xu Zhao-Dong1
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Abstract

New distributed measuring technique has been developed rapidly in recent years, and the damage detection strategy based on distributed strain responses becomes a particularly urgent research issue. So a damage index based on distributed strain mode differential is proposed firstly, and numerical simulation analysis is carried to a long span cable-stayed bridge under different testing conditions, all kinds of random disturbances which appear in the process of damage identification are analysis. Then, the repeated identification method is adopt to structures in the same health status under different environments, and a damage detection strategy based on mode residual trend is developed by using statistical trend analysis and assurance criteria of probability. Finally, numerical simulation analysis results showed that the proposed strategy can reduce the impact of all the random disturbances and the minor damages occurred in the girder of the bridge can be accurately identified. It solves many shortcomings of the traditional modal differential damage index, i.e. insensitive to minor and early damage of structures, besides damage misjudged and damage submerged are avoided.

Key words

Damage detection / distributed strain / mode residual trends / health monitoring / long-span cable stayed bridge

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Zeng Xin;Xu Zhao-Dong. Damage detection strategy based on strain mode residual trends for Long-span cable-stayed Bridge[J]. Journal of Vibration and Shock, 2013, 32(7): 78-81
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