Journal of the Korean Society of Safety (한국안전학회지)

The Korean Society of Safety (한국안전학회)
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Evaluation of Cable Tension Forces Using Vibration Method for a Cable-stayed Bridge under Construction

진동법을 이용한 사장교의 시공 중 장력 평가

  • Cho, Soojin (School of Urban and Environmental Engineering, Ulsan National Institute of Science and Technology) ;
  • Yun, Chung-Bang (School of Urban and Environmental Engineering, Ulsan National Institute of Science and Technology) ;
  • Sim, Sung-Han (School of Urban and Environmental Engineering, Ulsan National Institute of Science and Technology)
  • 조수진 (울산과학기술대학교 도시환경공학부) ;
  • 윤정방 (울산과학기술대학교 도시환경공학부) ;
  • 심성한 (울산과학기술대학교 도시환경공학부)
  • Received : 2013.11.11
  • Accepted : 2014.02.25
  • Published : 2014.04.30
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Abstract

When a cable-stayed bridge is under construction, the cable tension that changes according to the construction phase is the index indicating the proper construction management. In this study, the vibration method using the least-square estimation has been implemented to monitor changing tensions of two multi-strand cables of a cable-stayed bridge under construction. The test bridge is Hwamyung Bridge in Korea with a prestressed concrete box girder. The field tests are executed during the second tensioning stage just after the installation of the key segment. The tensions of two cables are measured before and after the tensioning and 5 days later (i.e., after finishing the tensioning of all cables). The accuracy of the estimated tensions by the vibration method has been improved by employing proper effective lengths of the cables. The measured tensions are compared with the result of the lift-off tests and design tensions. The vibration method shows very good performance in monitoring the changing tensions according to the construction phase with minimal error.

Keywords

References

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