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Three-step damage identification method based on dynamic characteristics |
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| Authors: | Sun Guoshuai Liu Chunguang Zhang Shibo Hao Ertong |
| Institution: | 1. Faculty of Infrastructure Engineering, Dalian University of Technology, Dalian 116024, China;College of Management, Liaoning University of Technology, Jinzhou 121001, China;State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, China 2. Faculty of Infrastructure Engineering, Dalian University of Technology, Dalian 116024, China;State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, China 3. Faculty of Infrastructure Engineering, Dalian University of Technology, Dalian 116024, China |
| Abstract: | A three-step damage identification method based on dynamic characteristics is proposed to improve the structure reliability and security and avoid serious accident. In the proposed method, the frequency and difference of modal curvature (DMC) are used as damage indexes. Firstly, the detection of the occurrence of damage is addressed by the frequency or the square of frequency change. Then the damage location inside the structure is measured by the DMC. Finally, with the stiffness reduction rate as a damage factor, the amount of damage is estimated by the optimization algorithm. The three-step damage identification method has been validated by conducting the simulation on a cantilever beam and the shaking table test on a submerged bridge. The results show that the method proposed in this paper can effectively solve the damage identification problem in theory and engineering practice. |
| Keywords: | damage identification dynamic characteristics frequency difference of modal curvature optimization algorithm shaking table test |
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