Structural damage identification based on modal indices and data fusion for an arch bridge of concrete-filled steel tube

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Journal of Vibration and Shock ›› 2009, Vol. 28 ›› Issue (12) : 91-95.

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Structural damage identification based on modal indices and data fusion for an arch bridge of concrete-filled steel tube

Jiang Shao-Fei1;Hu Chun-Ming2

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Abstract

In order to improve the diagnosis rate，a structural damage identification method based on modal indices and data fusion was proposed in this paper. In this method, multi-damage indices are used to initially diagnose damage on basis of structural vibration response. Then the weighted-average algorithm is used to fuze the multi-damage indices, and thus the fusion decision-making and damage location are made based on the peak value method. To verify the feasibility and efficiency, both single- and multi-damage patterns were simulated to identify for a two-span arch bridge of concrete-filled steel tube, and the effect of noise on identification accuracy was also taken into account. A comparison was made among the fusion method and single damage index. The results show that the proposed method can not only locate both sinle- and multi-damage patterns, but also excel single damage indices.

Key words

arch bridges of concrete-filled steel tube / damage identification / weighted average / data fusion / noise

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Jiang Shao-Fei;Hu Chun-Ming. Structural damage identification based on modal indices and data fusion for an arch bridge of concrete-filled steel tube[J]. Journal of Vibration and Shock, 2009, 28(12): 91-95