20 April 2000 Systematic numerical analysis of the damage index method used for bridge diagnostics
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The damage index method is an intuitively attractive method for detecting localized stiffness perturbations through their influence on mode shapes. In spite of its attractiveness, and a large literature on the formulation of the damage index method for different types of structures and its application to specific test problems, the practical consequences which can result from its limitations, as well as its overall effectiveness, have not been demonstrated or discussed. This is an important problem since, at minimum, the qualitative characteristics and performance of a proposed diagnostic algorithm should be understood. In this paper, the authors review the damage index formulation and examine the traditional assumption step by step. Then this method has been used for numerous cases at different locations and degrees of stiffness perturbation for a large pre-stressed segmental concrete bridge. The finite element models have been used as test structures. The object is to evaluate the feasibility of the damage index method.
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Ming L. Wang, Ming L. Wang, Fan Li Xu, Fan Li Xu, George M. Lloyd, George M. Lloyd, "Systematic numerical analysis of the damage index method used for bridge diagnostics", Proc. SPIE 3988, Smart Structures and Materials 2000: Smart Systems for Bridges, Structures, and Highways, (20 April 2000); doi: 10.1117/12.383136; https://doi.org/10.1117/12.383136

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