Structural Monitoring and Maintenance

  • 제7권4호
  • /
  • Pages.319-344
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  • 2020
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  • 2288-6605(pISSN)
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  • 2288-6613(eISSN)
테크노프레스 (Techno-Press)
권호 표지
DOI QR코드

DOI QR Code

Condition assessment of bridge pier using constrained minimum variance unbiased estimator

  • Tamuly, Pranjal (Department of Civil Engineering, Indian Institute of Technology Guwahati) ;
  • Chakraborty, Arunasis (Department of Civil Engineering, Indian Institute of Technology Guwahati) ;
  • Das, Sandip (Department of Civil Engineering, Indian Institute of Technology Guwahati)
  • 투고 : 2020.04.17
  • 심사 : 2020.09.25
  • 발행 : 2020.12.25
⟨ 이전 논문 다음 논문 ⟩

초록

Inverse analysis of non-linear reinforced concrete bridge pier using recursive Gaussian filtering for in-situ condition assessment is the main theme of this work. For this purpose, minimum variance unbiased estimation using unscented sigma points is adopted here. The uniqueness of this inverse analysis lies in its approach for strain based updating of engineering demand parameters, where appropriate bound and constrained conditions are introduced to ensure numerical stability and convergence. In this analysis, seismic input is also identified, which is an added advantage for the structures having no dedicated sensors for earthquake measurement. First, the proposed strategy is tested with a simulated example whose hysteretic properties are obtained from the slow-cyclic test of a frame to investigate its efficiency and accuracy. Finally, the experimental test data of a full-scale bridge pier is used to study its in-situ condition in terms of Park & Ang damage index. Overall the study shows the ability of the augmented minimum variance unbiased estimation based recursive time-marching algorithm for non-linear system identification with the aim to estimate the engineering damage parameters that are the fundamental information necessary for any future decision making for retrofitting/rehabilitation.

키워드

과제정보

Authors wish to acknowledge Dr. Matthew Schoettler and Professor Jose Restrepo for sharing the full-scale bridge pier test data in the public domain (i.e. DESIGNSAFE-CI platform).

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