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Integrity Estimation for Concrete Pontoon of Floating Structure

콘크리트 부유식 구조물 함체의 건전성 평가

  • Park, Soo-Yong (Department of Architecture and Ocean Space, National Korea Maritime University) ;
  • Kim, Min-Jin (Steel Flower Co., Ltd.) ;
  • Seo, Young-Kyo (Department of Ocean Engineering, National Korea Maritime University)
  • 박수용 (한국해양대학교 해양공간건축학과) ;
  • 김민진 ((주)스틸플라워) ;
  • 서영교 (한국해양대학교 해양공학과)
  • Received : 2013.07.24
  • Accepted : 2013.09.12
  • Published : 2013.10.31

Abstract

This paper presents damage detection and estimation of stiffness parameter on a concrete scale model and a real structure of concrete pontoon using dynamic properties such as mode shapes and natural frequencies. In case of damage detection, dynamic impact test on a concrete scale model is accomplished to extract mode shapes and the practicality is verified by utilizing a damage detection technique. And the stiffness parameter of a real structure of concrete pontoon was estimated via system identification technique using the natural frequencies of the structure. The results indicate that the damaged elements of the scale model are found exactly using damage detection technique and the effective stiffness property of the real structure of concrete pontoon can be estimated by system identification technique.

본 논문은 구조물의 동적특성인 모드형상과 고유진동수를 이용한 손상탐지와 유효 물성치 추정을 통하여 콘크리트 축소모형과 실제 콘크리트 부유식 구조물 함체의 건전성을 평가하였다. 손상탐지의 경우 콘크리트 축소모형에 대한 동적실험을 수행하여 모드형상을 추출한 후 손상탐지기법에 적용하여 실용성을 증명하였다. 또한 실제 콘크리트 부유식 구조물 함체의 모드형상 및 고유진동수를 실험을 통하여 구한 후 구조계추정기법을 이용하여 콘크리트의 유효 물성치를 추정하였다. 손상탐지기법을 이용하여 축소모형의 손상부재를 정확히 찾아내었으며, 구조계추정기법을 이용하여 실제 콘크리트 부유식 함체의 현재 유효 물성치를 추정하였다.

Keywords

References

  1. Choi, S. and Stubbs, N.(1997), "Nondestructive Damage Detection Algorithms for 2D Plates", SPIE Proceedings: Smart Structures and Materials, Vol. 3043, pp. 193-204.
  2. Gibson, J. D. and Melsa, J. L.(1975), Introduction to Nonparametric Detection with Applications, Academic Press.
  3. Jung, T. Y. and Jung, J. H.(1999), "Floating Structure for Ocean Space Utilization", Journal of Korean Society of Civil Engineers, Vol. 8, No. 1, pp. 6-12.
  4. Park, S. Y.(2003), "Linkage of Damage Evaluation to Structural System Reliability", Journal of Steel Structures, Vol. 15, No. 1, pp. 41-50.
  5. Stubbs, N. and Osegueda, R.(1990), "Global Non-destructive Damage Evaluation in Solids", International Journal of Analytical and Experimental Modal Analysis, Vol. 5, No. 2, pp. 67-79.
  6. Tsinker, G. P.(2004), Port Engineering : Planning, Construction, Maintenance, and Security, John Wiley & Sons.