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Two-Stage Multi-damage Detection Method Based on Energy Balance Equation

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Abstract

In order to solve structural multi-damage identification problem, a two-stage damage detection method based on energy balance equation and evidence fusion is presented. First, a Frequency Change Identification (FCI) method and Modal Strain Energy Dissipation Ratio (MSEDR) method are utilized to preliminarily identify structural damage locations, and then a Fusion Damage Localization (FDL) method based on evidence theory is proposed to precisely detect damage locations. The FDL method mainly utilizes evidence theory to combine both the FCI localization information and the MSEDR localization information. Thus, more precise damage localization information can be acquired. After the damaged locations are determined, an Energy Balance Equation (EBE) index is presented to identify structural damage extent. Considering that strain energy dissipation should be equal to the change of modal strain energy, a quartic EBE equation is deduced, and structural damage extent can be obtained through the solution of the equation. An average quantification index is also proposed to improve identification precision. The simulation results demonstrate that the FDL method can perfectly detect structural damage locations, and the EBE index and average index can identify structural damage extent.

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Authors and Affiliations

  1. School of civil Engineering, Chongqing University, Chongqing, 400045, China

    H. Y. Guo & Z. L. Li

  2. Key Laboratory of New Technology for Construction of Cities in Mountain Area (Chongqing University), Ministry of Education, Chongqing, 400045, China

    H. Y. Guo & Z. L. Li

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  1. H. Y. Guo
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  2. Z. L. Li
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Correspondence to H. Y. Guo.

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Guo, H.Y., Li, Z.L. Two-Stage Multi-damage Detection Method Based on Energy Balance Equation. J Nondestruct Eval 30, 186–200 (2011). https://doi.org/10.1007/s10921-011-0107-7

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  • DOI: https://doi.org/10.1007/s10921-011-0107-7

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