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Finite Element Model Updating Using API User Interface

Ahmadi Saniani, Zahra | 2024

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 57698 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Bakhshi, Ali
  7. Abstract:
  8. Damage in civil infrastructure is an unavoidable phenomenon. Therefore, using structural health monitoring methods is of great importance. In this thesis, the location and severity of damage in a structure are simultaneously determined using the solution of sensitivity equations of the frequency response function and its principal components. The derived sensitivity equations are quasi-linear and do not require higher-order derivatives of the principal components of the frequency response function in their formulation. Using these sensitivity equations, error minimization through the least squares method, and the finite element model updating method along with the API user interface, the location and severity of damage are determined, and the sensitivity of the method to measurement errors is also calculated. In this approach, the mass matrix is not updated, and frequency ranges used for updating are selected to neutralize the effect of unupdated damping. Innovations in this thesis include the application of the sensitivity equation to a three-dimensional structure (an offshore platform) and the use of the API user interface for updating. In the damage detection process, after identifying the location and severity of damaged elements in the structure, MATLAB software assigns various sections to the structure for replacing the damaged elements to find the best section that brings the response of the healthy structure closer to the response of the damaged structure. Essentially, alongside the level 3 damage detection process, the best sections for replacing the damaged elements are assigned to the structure. Finite element modeling is performed in SAP2000 software, and programming is done in MATLAB. The proposed method has been validated through numerical and experimental examples, and the results have been very satisfactory, accurately updating damage in axial and bending stiffness elements
  9. Keywords:
  10. Model Updating ; Finite Element Model ; Damage Identification ; Sensitivity Equations ; Frequency Response ; Experimental Validation ; Application Programming Interfaces (API) ; Structural Health Monitoring

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