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2024 Vol.37, Issue 6 Preview Page

Research Paper

Analysis of the Confinement Effect of a Concrete-Filled Tube Strengthened with Perfobond Rib Shear Connectors

전단연결재로 보강된 콘크리트 충전 강관의 심부구속효과에 대한 분석

Sung-Wook Hong1
,
Se-Yun Kim2
,
Tong-Seok Han3*
홍 성욱1
,
김 세윤2
,
한 동석3*
1Graduate Student, Department of Civil and Environmental Engineering, Yonsei University, Seoul, 03722, Korea
2Postdoctoral researcher, Department of Civil and Environmental Engineering, Yonsei University, Seoul, 03722, Korea
3Professor, Department of Civil and Environmental Engineering, Yonsei University, Seoul, 03722, Korea
1연세대학교 건설환경공학과 석박사통합과정
2연세대학교 건설환경공학과 박사후연구원
3연세대학교 건설환경공학과 교수
*Corresponding Author
31 December 2024. pp. 409-416
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Abstract

A concrete filled tube (CFT) that is subjected to compressive loading exhibits a reduction in brittleness of internal concrete. This reduction in brittleness is a result of the confinement effect caused by the steel tube, which significantly increases the compressive strength of the CFT. In this study, the confinement effect of the concrete was enhanced by reinforcing the steel tube with perfobond rib shear connector, known as perfobond leiste (PBL). The confinement effect was evaluated by implementing specific material properties and boundary conditions within the finite element method model. To simulate the interface behavior between steel and concrete more accurately, cohesive elements were employed in the model, which enabled the modeling of the load transfer path between the steel tube and the concrete. To verify the improvement in the confinement effect resulting from the use of shear connectors, experiments and simulations were conducted on scaled models of the CFT with PBL. A comparison with a CFT without PBL confirmed the performance improvement. A parametric study was conducted to investigate the effect of variations in diameter and number of holes in the PBL on the shear resistance and confinement effect. The impact of variations in shear resistance on the structural performance of CFT was investigated, and the consistency between experimental and simulation results was evaluated.

Keywords
concrete filled tube
confinement effect
perfobond rib shear connector
finite element method
shear resistance

압축하중을 받는 콘크리트 충전 강관(CFT) 부재는 강관에 의한 심부구속효과로 인해 내부 콘크리트의 취성이 감소하며, 이는 CFT 부재의 압축강도를 크게 증가시킨다. 본 연구에서는 강관을 퍼포본드 리브 전단연결재로 보강하여 콘크리트의 심부구속효과를 향상시키고, 유한요소해석 모델에서 재료 특성 및 경계 조건을 설정하여 이를 평가하였다. 이때, 강재와 콘크리트 사이의 계면 거동을 보다 정확하게 모사하기 위해 cohesive element를 사용하였으며, 이를 통해 강관과 콘크리트 간 하중 전달을 모델링하였다. 전단연결재로 인한 심부구속효과 향상을 검증하기 위해 퍼포본드 리브 전단연결재가 적용된 CFT 부재의 축소 모델에 대한 실험 및 유한요소해석을 수행하였고, 전단연결재가 없는 CFT 부재와의 비교를 통해 성능 향상이 확인되었다. 퍼포본드 리브 전단연결재는 홀의 지름 및 개수를 변화시키며 파라미터 스터디를 수행하였고, 이로 인해 전단연결재의 전단저항력 변화가 심부구속효과에 미치는 영향에 대해 평가하였다. 전단연결재의 전단저항력 변화에 따른 CFT 부재의 구조적 성능 차이를 분석하면서, 실험과 유한요소해석의 일치성을 검토하였다.

키워드
콘크리트 충전 강관
심부구속효과
퍼포본드 리브 전단연결재
유한요소해석
전단저항력
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Information
  • Publisher :Computational Structural Engineering Institute of Korea
  • Publisher(Ko) :한국전산구조공학회
  • Journal Title :Journal of the Computational Structural Engineering Institute of Korea
  • Journal Title(Ko) :한국전산구조공학회 논문집
  • Volume : 37
  • No :6
  • Pages :409-416
  • Received Date : 2024-09-09
  • Revised Date : 2024-10-07
  • Accepted Date : 2024-10-07
  • DOI :https://doi.org/10.7734/COSEIK.2024.37.6.409
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