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2026 Vol.3, Issue 2

Research Article

Behavioral Characteristics of Infrastructure Structural Members Reinforced with High-Strength Corrosion-Resistant GFRP Bars

고강도 내부식 GFRP 보강근 적용 인프라 구조부재의 거동 특성

Sang-Youl Lee1
,
Jum-Sik Chae2*
이 상열1
,
채 점식2*
1Professor, School of Civil, Environmental and Architectural Engineering, Gyeongkuk National University, Andong, 36729, Rep. of Korea
2Audit Officer, Jung-gu District Office, Seoul, 04558, Rep. of Korea
1국립경국대학교 건설환경건축공학부 교수
2서울특별시 중구청 감사담당관
*Corresponding Author
30 April 2026. pp. 81-88
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Abstract

This study was conducted to evaluate the structural behavior of infrastructure members reinforced with high-strength, corrosion-resistant GFRP bars. In recent years, the deterioration of structural durability due to steel corrosion has become a critical issue, leading to the need for alternative reinforcing materials such as GFRP bars. GFRP reinforcement exhibits lightweight characteristics and high tensile strength; however, its linear elastic and brittle behavior requires a design approach different from that of conventional steel reinforcement. In this study, three-dimensional numerical analyses using ANSYS were performed on beam and column members to compare the structural behavior with that of steel-reinforced structures. The analysis results showed that GFRP-reinforced members exhibited slightly larger displacements than steel-reinforced members due to their lower elastic modulus. However, the initial cracking load was similar in both cases, indicating comparable initial structural performance. In beam members, GFRP reinforcement maintained high tensile stress without yielding, demonstrating stable behavior. Similarly, in column members, stable stress distribution under compressive loading conditions was observed, comparable to that of steel reinforcement. In addition, the overall stress distribution and cracking patterns were similar to those of steel-reinforced structures, confirming the consistency of the structural system. Overall, GFRP reinforcement is considered a viable alternative material for infrastructure structures, particularly due to its favorable performance under extreme loading conditions.

Keywords
GFRP
3-D modeling
Ultimate load
numerical analysis

본 연구는 고강도 내부식 특성을 갖는 GFRP 보강근을 적용한 인프라 구조부재의 구조적 거동을 평가하기 위해 수행되었다. 최근 철근 부식으로 인한 구조물 내구성 저하 문제가 증가함에 따라 이를 대체할 수 있는 재료로서 GFRP 보강근의 적용 필요성이 제기되고 있다. GFRP 보강근은 경량성과 높은 인장강도를 가지는 반면, 선형탄성 및 취성적 거동 특성을 나타내어 기존 철근과는 차별화된 설계 접근이 요구된다. 이에 본 연구에서는 보 및 기둥 부재를 대상으로 ANSYS 기반 3차원 수치해석을 수행하여 철근 보강 구조와의 거동 특성을 비교하였다. 해석 결과, GFRP 보강근은 낮은 탄성계수로 인해 철근 대비 변위가 다소 증가하는 경향을 보였다. 그러나 초기 균열 발생 하중은 두 경우 모두 유사하게 나타나 구조적 초기 성능은 동등 수준임을 확인하였다. 보 부재에서는 GFRP 보강 시 높은 인장응력을 유지하며 항복 없이 안정적인 거동을 나타냈다. 기둥 부재에서도 압축 하중 조건에서 철근과 유사한 안정적인 응력 분포가 확인되었다. 또한 응력 분포 및 균열 양상은 전반적으로 철근 보강 구조와 유사하게 나타나 구조 시스템의 일관성이 유지됨을 확인하였다. 종합적으로 GFRP 보강근은 극한 하중 조건에서 유리한 성능을 가지며 인프라 구조물에 적용 가능한 대체 재료로 판단된다.

키워드
GFRP
3차원 모델링
극한 조건
수치해석
References
1

AASHTO (2018) Guide Specifications for Design of Concrete Bridge Decks Reinforced with GFRP Bars. Washington, D.C.: American Association of State Highway and Transportation Officials.

2

ACI Committee (2015) Guide for the Design and Construction of Structural Concrete Reinforced with FRP Bars (ACI 440.1R-15). Farmington Hills, MI: American Concrete Institute.

3

ACI Committee (2022) Building Code Requirements for Structural Concrete Reinforced with FRP Bars (ACI 440.11-22). Farmington Hills, MI: American Concrete Institute.

4

Bank, L. C. (2006) Composites for Construction: Structural Design with FRP Materials. Hoboken, NJ: John Wiley & Sons.

10.1002/9780470121429
5

CSA (2012) CSA S806:12: Design and Construction of Building Components with Fibre-Reinforced Polymers. Mississauga, ON: Canadian Standards Association.

6

Gibson, R. F. (2016) Principles of Composite Material Mechanics. 4th edition. Boca Raton, FL: CRC Press.

7

Hollaway, L. C. (2010) A Review of the Present and Future Utilisation of FRP Composites in the Civil Infrastructure. Construction and Building Materials 24(12), 2419-2445.

10.1016/j.conbuildmat.2010.04.062
8

Issa, M. A., Metwally, I. M., and Elzeiny, S. M. (2024) Effect of GFRP Stirrup Spacing on the Behavior of Reinforced Concrete Beams. Civil Engineering Journal 10(1), 85-102.

9

Mistretta, F., Pellegrino, C., and Modena, C. (2023) Shear Behavior of Concrete Beams Reinforced with GFRP bars. Materials and Structures 56(3), 45.

10.1617/s11527-023-02256-z
10

Nouri, Y., Chaallal, O., and Benmokrane, B. (2025) Flexural Behavior of GFRP Reinforced Concrete Beams: Experimental and Numerical Investigation. Composite Structures 330, 117-135.

11

Resende, T. L., Torres, L., and Guadagnini, M. (2025) Shear Behavior and Crack Mechanisms of GFRP Reinforced Concrete Beams. Engineering Structures 312, 118145.

Information
  • Publisher :Korea Protective Facility Institute
  • Publisher(Ko) :한국방호시설학회
  • Journal Title :Protective Facility
  • Journal Title(Ko) :방호시설
  • Volume : 3
  • No :2
  • Pages :81-88
  • Received Date : 2026-03-10
  • Revised Date : 2026-03-18
  • Accepted Date : 2026-04-02
  • DOI :https://doi.org/10.23310/PF.2026.3.2.081
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