Research on damage identification method of bridge structure based on displacement average curvature difference

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Journal of Vibration and Shock ›› 2023, Vol. 42 ›› Issue (10) : 240-250.

WU Shengping1，2， JIANG Guoping1

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Abstract

Aiming at the problem that structural damage identification is greatly disturbed by external random loads, this paper proposes the mean curvature difference method of the normalized mean displacement.In this method, the mean value of the displacement response of the multi-sample group is used as the damage characteristic function, and the influence of noise is preliminarily eliminated. Then, the curvature of the displacement mean curve is normalized, and the curvature difference is calculated to greatly reduce the influence of random loads. Finally, the average curvature difference of adjacent measuring points is used as the damage identification index to judge the damaged unit. In this paper, simply supported beam bridge and self-anchored suspension bridge are taken as examples to verify the proposed method from both theoretical and numerical model aspects. The results show that the method proposed in this paper can not only identify the damage of the structure under any moving load, but also is suitable for the damage identification of the structure under the random load. The paper also analyzes the influence of different degrees of noise on the recognition effect. From the analysis results, it can be seen that the method has good anti-noise performance.

Key words

curvature / displacement / normalization / damage identification / random loading

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WU Shengping1，2， JIANG Guoping1. Research on damage identification method of bridge structure based on displacement average curvature difference[J]. Journal of Vibration and Shock, 2023, 42(10): 240-250

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