Journal of Ocean Engineering and Technology (한국해양공학회지)

Korean Society of Ocean Engineers (한국해양공학회)
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Prestress-Loss Monitoring Technique for Prestressd Concrete Girders using Vibration-based System Identification

진동기반 구조식별을 통한 프리스트레스트 콘크리트 거더의 긴장력 손실 검색 기법

  • Ho, Duc-Duy (Smart Structure Engineering Laboratory, Ocean Engineering, Pukyong National University) ;
  • Hong, Dong-Soo (Smart Structure Engineering Laboratory, Ocean Engineering, Pukyong National University) ;
  • Kim, Jeong-Tae (Smart Structure Engineering Laboratory, Ocean Engineering, Pukyong National University)
  • 호득유이 (부경대학교 해양공학과 스마트구조공학연구실) ;
  • 홍동수 (부경대학교 해양공학과 스마트구조공학연구실) ;
  • 김정태 (부경대학교 해양공학과 스마트구조공학연구실)
  • Published : 2010.02.28
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Abstract

This paper presents a prestress-loss monitoring technique for prestressed concrete (PSC) girder structures that uses a vibration-based system identification method. First, the theoretical backgrounds of the prestress-loss monitoring technique and the system identification technique are presented. Second, vibration tests are performed on a lab-scaled PSC girder for which the modal parameter was measured for several prestress-force cases. A numerical modal analysis is performed by using an initial finite element (FE) model from the geometric, material, and boundary conditions of the lab-scaled PSC girder. Third, a vibration-based system identification is performed to update the FE model by identifying structural parameters since the natural frequency of the FE model became identical to the experimental results. Finally, the feasibility of the prestress-loss monitoring technique is evaluated for the PSC girder model by using the experimentally measured natural frequency and numerically identified natural frequency for several prestress-force cases.

Keywords

References

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