전단연결재로 보강된 콘크리트 충전 강관의 심부구속효과에 대한 분석
Analysis of the Confinement Effect of a Concrete-Filled Tube Strengthened with Perfobond Rib Shear Connectors
1
조회
0
다운로드
0
인용
0
참고문헌
키워드
초록
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.
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.
참고문헌 (18)
- Abaqus, V., "6.14, Online Documentation Help, Theory Manual: Dassault Systms", ~ (2016)
- Benzeggagh, M. L., "Measurement of Mixed-Mode Delamination Fracture Toughness of Unidirectional Glass", Epoxy Composites with Mixed-Mode Bending Apparatus, 1996, pp.56(4), 439~449
- Guan, M., "Bond Behavior of Concrete-Filled Steel Tube Columns using Manufactured Sand(MS-CFT)", Eng. Struct, 187, pp.199~208 (2019)
- Guan, M., "Bond behavior of Square CFT using Manufactured Sand and Recycled Coarse Aggregate", Constr. Build. Mater., 269, pp.121289~ (2021)
- Hsiao, P. C., "Investigation of Concrete-Filled Double-Skin Steel Tubular Columns with Ultrahigh-Strength Steel", J. Struct. Eng., 141(7), pp.04014166~ (2015)
- Ince, R., "Size-Dependent Response of Dowel Action in RC Members", Eng. Struct, 29(6), pp.955~961 (2007)
- Kang, J. Y., "Evaluation of the Shear Strength of Perfobond Rib Connectors in Ultra High Performance Concrete", Eng, 6(13), pp.989~ (2014)
- Li, G., "Improve the Strength of Concrete-Filled Steel Tubular Columns by the use of Fly Ash", Cem. Concr. Res, 33(5), pp.733~739 (2003)
- Ministry of Land, Infrastructure and Transport, "Highway Bridge Design Standard (Limit State Design)", ~ (2016)
- Oguejiofor, E. C., "A Parametric Study of Perfobond Rib Shear Connectors", Can. J. Civ. Eng, 21(4), pp.614~625 (1994)
- Ostrowski, K., "Compressive Behaviour of Concrete-Filled Carbon Fiber-Reinforced Polymer Steel Composite Tube Columns Made of High Performance Concrete", Compos. Struct, 234, pp.111668~ (2020)
- Pinto, C., "The Mechanical Behavior of High-Strength Concrete-Filled Steel Tubes : A Review", Civil Eng, 5(3), pp.591~608 (2024)
- Rehmat, S., "Experimental Study on Concrete Filled Steel Tubes to Footing Connection using Ultra-High Performance Concrete", Eng. Struct, 242, pp.112540~ (2021)
- Starossek, U., "The Interaction of Steel Tube and Concrete Core in Concrete-Filled Steel Tube Columns", Tubular Struct, 12, pp.93~102 (2008)
- Starossek, U., "The Interaction of Steel Tube and Concrete Core in Concrete-Filled Steel Tube Columns", pp.75~84 (2009)
- Vrcelj, Z., "Strength of Slender Concrete-Filled Steel Box Columns Incorporating Local Buckling", J. Constr. Steel Res, 58(2), pp.275~300 (2002)
- Wang, Q., "Experimental Study on the Strength and Ductility of Steel Tubular Columns Filled with Steel-Reinforced Concrete", Eng. Struct, 26(7), pp.907~915 (2004)
- Xue, Z., "A Damage Model with Subsection Curve of Concrete and Its Numerical Verification based on ABAQUS", 2010 Int. Conf. Comput. Des. Appl., 5, pp.V5~V34 (2010)