Damage identification method for hinge joints in slab-girder bridge based on RSEI

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Journal of Vibration and Shock ›› 2024, Vol. 43 ›› Issue (19) : 249-257.

XU Xinxiang1, ZHAN Jiawang1, WANG Chuang1, FENG Zhichao2, ZHAO Jingqi1

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Abstract

To achieve quantitative and locational identification of hinge joint damage in slab girder bridges, this paper proposed a damage identification method based on the recursive singular energy index: Firstly, the vertical impact vibration signals from adjacent girders of the bridge under investigation were analyzed using cross recursive, resulting in a threshold-free cross recursive matrix. Secondly, the matrix was subjected to singular value decomposition to further extract damage characteristics. Finally, the energy of the singular values was calculated to serve as a damage-sensitive index (Recurrence Singular Energy Index, RSEI). An application method for the RSEI index in hinge joint damage identification was established as well as its applicability was thoroughly explored. The results indicate that the RSEI index is sensitive to hinge joint damage in plate girder bridges. The proposed method can quantitatively identify the average degree of damage to hinge joints and the location of damaged hinge joints. by placing a row of sensors in the middle of the span, and it performs well. The identification results are minimally affected by the location of the damage, the number of damages, and noise. The impact location does have some effect on the results, but the identification performance remains within an acceptable range. When applying the RSEI index for hinge joint damage identification in plate girder bridges, it is recommended to place the impact location in the middle of the side girder to avoid the impact of the impact location on the identification results, thereby achieving more ideal identification results.

Key words

damage identification / slab beam bridge / hinge joint / recursive singular energy / recursive graph

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XU Xinxiang1, ZHAN Jiawang1, WANG Chuang1, FENG Zhichao2, ZHAO Jingqi1. Damage identification method for hinge joints in slab-girder bridge based on RSEI[J]. Journal of Vibration and Shock, 2024, 43(19): 249-257

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