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Structural Engineering and Mechanics Volume 53, Number 2, January25 2015 , pages 261-276 DOI: https://doi.org/10.12989/sem.2015.53.2.261 |
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Structural damage and force identification under moving load |
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Hongping Zhu, Ling Mao, Shun Weng, Yong Xia
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| Abstract | ||
| Structural damage and moving load identification are the two aspects of structural system identification. However, they universally coexist in the damaged structures subject to unknown moving load. This paper proposed a dynamic response sensitivity-based model updating method to simultaneously identify the structural damage and moving force. The moving force which is equivalent as the nodal force of the structure can be expressed as a series of orthogonal polynomial. Based on the system Markov parameters by the state space method, the dynamic response and the dynamic response derivatives with respect to the force parameters and elemental variations are analytically derived. Afterwards, the damage and force parameters are obtained by minimizing the difference between measured and analytical response in the sensitivity-based updating procedure. A numerical example for a simply supported beam under the moving load is employed to verify the accuracy of the proposed method.Structural damage and moving load identification are the two aspects of structural system identification. However, they universally coexist in the damaged structures subject to unknown moving load. This paper proposed a dynamic response sensitivity-based model updating method to simultaneously identify the structural damage and moving force. The moving force which is equivalent as the nodal force of the structure can be expressed as a series of orthogonal polynomial. Based on the system Markov parameters by the state space method, the dynamic response and the dynamic response derivatives with respect to the force parameters and elemental variations are analytically derived. Afterwards, the damage and force parameters are obtained by minimizing the difference between measured and analytical response in the sensitivity-based updating procedure. A numerical example for a simply supported beam under the moving load is employed to verify the accuracy of the proposed method. | ||
| Key Words | ||
| structural damage identification; response sensitivity; system Markov parameters; moving load | ||
| Address | ||
| Hongping Zhu: School of Civil Engineering and Mechanics, Huazhong University of Science and Technology, Wuhan, Hubei, P.R. China Ling Mao: School of Civil Engineering and Mechanics, Huazhong University of Science and Technology, Wuhan, Hubei, P.R. China Shun Weng: School of Civil Engineering and Mechanics, Huazhong University of Science and Technology, Wuhan, Hubei, P.R. China Yong Xia: Department of Civil & Structural Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong | ||