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Retrofit Design of RC Column by Displacement-Based-Design Method

변위기반설계법에 의한 철근콘크리트 기둥의 보강설계

  • Lim, Cheong-Kweon (Korea Institute of Construction & Transportation Technology Evaluation and Planning) ;
  • Kwon, Min-Ho (Department of Civil Engineering, GyeongSang National University) ;
  • Ha, Keum-Hee (Department of Civil Engineering, GyeongSang National University) ;
  • Kim, Jin-Sup (Department of Civil Engineering, GyeongSang National University)
  • 임청권 (한국건설교통기술평가원) ;
  • 권민호 (경상대학교 공과대학 토목공학과) ;
  • 하금희 (경상대학교 공과대학 토목공학과) ;
  • 김진섭 (경상대학교 공과대학 토목공학과)
  • Received : 2012.03.15
  • Accepted : 2012.06.07
  • Published : 2012.06.30

Abstract

In this study, It is developed a retrofitting procedure of RC column with rectangular section to archive the target displacement at failure. Nonlinear behavior of the column is considered as the equivalent linear system. First, target displacement is determined, and then elastic displacement spectrum is constructed to estimate the equivalent natural vibration period of the SDOF system. After natural vibration period is determined, required strength is calculated using secant stiffness based on the mass of system. In accordance with, obtained force-displacement relationship through non-linear fiber based section analysis, retrofit design was carried out to meet required strength. As a result, retrofitted RC column can confirm that the improved seismic performance. It is observed that the proposed design procedure can be applicable to seismic retrofitting design of columns.

본 연구에서는 직접변위기반 설계법에 의하여 철근콘크리트 기둥이 목표변위에 도달하도록 하는 보강설계를 수행하였다. 철근콘크리트 기둥의 비선형 거동은 등가 선형 시스템으로 단순화하여 해석한다. 먼저 목표변위를 결정하고, 단자유도 시스템의 등가고유주기를 추정하기 위하여 탄성 변위스펙트럼을 작성하였다. 고유주기가 결정되면 시스템의 질량을 근거로 강성을 이용하여 요구강도를 계산한다. 이후 비선형 층상화 단면해석을 통해 얻어진 하중-변위관계에 따라 요구강도를 만족하는 보강설계를 수행하였다. 비선형 층상화 단면해석 프로그램을 개발하고 보강설계 절차를 제안하였으며 이를 적용한 결과, 보강설계를 통해 보강한 철근콘크리트 기둥은 보강하지 않은 기둥과 비교하여 내진 성능이 향상 된 것을 확인 할 수 있었다.

Keywords

References

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