Structural Engineering and Mechanics

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Structural damage and force identification under moving load

  • Zhu, Hongping (School of Civil Engineering and Mechanics, Huazhong University of Science and Technology) ;
  • Mao, Ling (School of Civil Engineering and Mechanics, Huazhong University of Science and Technology) ;
  • Weng, Shun (School of Civil Engineering and Mechanics, Huazhong University of Science and Technology) ;
  • Xia, Yong (Department of Civil & Structural Engineering, The Hong Kong Polytechnic Unversity)
  • Received : 2013.10.17
  • Accepted : 2014.05.17
  • Published : 2015.01.25
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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.

Keywords

Acknowledgement

Supported by : National Natural Science Foundation of China, Central Universities

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