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Liu X.,Tianjin University | Liu X.,Tianjin Key Laboratory of Nonlinear Dynamic and Chaos Control | Xiang L.,Tianjin University | Xiang L.,Tianjin Key Laboratory of Nonlinear Dynamic and Chaos Control | And 2 more authors.
Zhendong Ceshi Yu Zhenduan/Journal of Vibration, Measurement and Diagnosis | Year: 2015

An approach to structural damage identification based on the change of wavelet sub-band signal energy curvature is proposed. To analyze the vibration responses of the intact and damaged structures, the dyadic discrete wavelet transform is adopted. The signal is then decomposed into different sub-bands at the same time the different modal responses are separated. The damage index of the relative energy curvature difference is defined and used to identify the damage location. The numerical simulation study of a simply supported beam bridge shows that the dyadic discrete wavelet transform can successfully separate the different modal responses into different bands, and the damage index can be used to effectively determine the location of the damage, which cannot be affected by the vibration position and the load size. Finally, the method is verified with the experiment of a simply supported beam bridge model. ©, 2015, Nanjing University of Aeronautics an Astronautics. All right reserved.


Liu X.,Tianjin University | Liu X.,Tianjin Key Laboratory of Nonlinear Dynamic and Chaos Control | Xiang L.,Tianjin University | Xiang L.,Tianjin Key Laboratory of Nonlinear Dynamic and Chaos Control | And 4 more authors.
Zhendong Ceshi Yu Zhenduan/Journal of Vibration, Measurement and Diagnosis | Year: 2015

Vehicles easily jump when crossing a bridge deck with large local roughness. To study the effect of vehicle load on bridge vibration, a vehicle-bridge coupling vibration experimental system considering vehicle bumping is established based on a double pylon cable-stayed bridge model. Continuous wavelet transform is adopted to analyze the time-frequency characteristics and energy distribution of the girder's vibration signals. The impact effect of vehicle bumping on the bridge is discussed under different pavement conditions, and the distribution of the bridge vibration response is obtained with vehicle bumping at different positions. The results will provide reference for bridge design and safety operations. © 2015, Nanjing University of Aeronautics an Astronautics. All right reserved.

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