Evaluation of Structural Performance of Composite Rahmen Girder with T-shaped Widened Part by Static Loading Test

doi:10.15683/kosdi.2025.12.31.1195

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2025 Vol.21, Issue 4 Preview Page

Research Article

Evaluation of Structural Performance of Composite Rahmen Girder with T-shaped Widened Part by Static Loading Test 정적 재하 실험을 통한 T형 확폭부 적용 강합성 라멘거더의 구조 성능 평가: 구동열¹ㆍ박승진²*ㆍ김성³
Dong-Yeol Koo¹, Sung-Jin Park²*, Sung Kim³; ¹Doctor’s Course, Department of Urban Convergence, Incheon National University, Incheon, Republic of Korea
²Professor, Department of Urban Engineering, Incheon National University, Incheon, Republic of Korea
³CEO, ReTon Bridge, Republc of Korea

31 December 2025. pp. 1195-1200

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Abstract

Purpose: The purpose of this study is to empirically investigate the structural behavior and safety of the ‘Composite Rahmen Girder with T-shaped Widened Ends,’ which was developed to overcome the span length limitations of conventional Rahmen bridges and improve constructability. Method: To achieve this, a full-scale specimen was fabricated to analyze the effect of prestressing force introduced by PS bars, and step-by-step static loading tests were performed up to failure to evaluate the load- displacement and load-strain relationships. Result: It was confirmed that an initial camber of 6.83mm was effectively introduced at the mid-span through the tensioning of the bars. During the loading test, the specimen exhibited sufficient ductile behavior without a sudden drop in load until the final failure at 524.7kN. Conclusion: It was confirmed that the Composite Rahmen Girder with T-shaped Widened Ends possesses excellent deflection control capability and flexural load-carrying capacity, as well as secured torsional resistance performance. Consequently, the structural efficiency and field applicability of this system for medium and small-span bridges were verified to be valid.

Keywords

Composite Rahmen Girder

T-shaped Widened Part

Static Loading Test

Pre-stress

Stress Distribution

연구목적: 본 연구는 기존 라멘교의 경간장 제약을 극복하고 시공성을 개선하기 위해 개발된 T형 확폭부를 적용한 강합성 라멘 거더의 구조적 거동과 안전성을 실증적으로 규명하는 데 목적이 있다. 이를 위해 연구방법: 실물 크기의 실험체를 제작하여 PS 강봉을 이용한 긴장력 도입 효과를 분석하고, 파괴 시까지의 단계별 정적 재하 실험을 수행하여 하중-변위 및 하중-변형률 관계를 평가하였다. 연구결과: 강봉 긴장을 통해 거더 중앙부에 6.83mm의 초기 솟음(Camber)이 효과적으로 도입됨을 확인하였으며, 재하 실험 시 하중 524.7kN에서 최종 파괴될 때까지 급격한 하중 저하 없이 충분한 연성 거동을 나타내었다. 결론: T형 확폭부를 적용한 강합성 라멘거더는 처짐 제어 능력과 휨 내하력이 우수하고 비틀림 저항 성능 또한 확보되어, 중소경간 교량에서의 구조적 효율성과 현장 적용성이 타당함을 확인하였다.

키워드

강합성 라멘거더

T형 확폭부

정적 재하 실험

프리스트레스

응력 분산

References

AASHTO (2020). AASHTO LRFD Bridge Design Specifications (9th ed.). American Association of State Highway and Transportation Officials, Washington, DC.
CEN (European Committee for Standardization) (2004). Eurocode 4: Design of Composite Steel and Concrete Structures - Part 2: General Rules and Rules for Bridges (EN 1994-2). Brussels, Belgium.
Johnson, R.P. (2018). Composite Structures of Steel and Concrete: Beams, Slabs, Columns, and Frames for Buildings (4th ed.). Wiley-Blackwell, Oxford, UK. 10.1002/9781119401353
Kim, T.H., Chin, W.J., Hwang, H.J., Choi, E.S. (2015). “Structural performance of pre-flexed composite girder with pre-stressing.” International Journal of Steel Structures, Vol. 15, No. 3, pp. 677-688.
Ministry of Land, Infrastructure and Transport (2016). Highway Bridge Design Specifications (Limit State Design).
Oehlers, D.J., Bradford, M.A. (1995). Composite Steel and Concrete Structural Members: Fundamental Behaviour. Pergamon Press, Oxford, UK
Park, J.C., Park, C.M. (2004). “Experimental study on the flexural behavior of composite rahmen bridge.” Journal of the Korean Society of Civil Engineers, Vol. 24, No. 1A, pp. 123-130.

Information

Publisher :The Korean Society of Disaster Information
Publisher(Ko) :한국재난정보학회
Journal Title :Journal of the Society of Disaster Information
Journal Title(Ko) :한국재난정보학회논문집
Volume : 21
No :4
Pages :1195-1200
DOI :https://doi.org/10.15683/kosdi.2025.12.31.1195

[1] AASHTO (2020). AASHTO LRFD Bridge Design Specifications (9th ed.). American Association of State Highway and Transportation Officials, Washington, DC.

[2] CEN (European Committee for Standardization) (2004). Eurocode 4: Design of Composite Steel and Concrete Structures - Part 2: General Rules and Rules for Bridges (EN 1994-2). Brussels, Belgium.

[3] Johnson, R.P. (2018). Composite Structures of Steel and Concrete: Beams, Slabs, Columns, and Frames for Buildings (4th ed.). Wiley-Blackwell, Oxford, UK. 10.1002/9781119401353

[4] Kim, T.H., Chin, W.J., Hwang, H.J., Choi, E.S. (2015). “Structural performance of pre-flexed composite girder with pre-stressing.” International Journal of Steel Structures, Vol. 15, No. 3, pp. 677-688.

[5] Ministry of Land, Infrastructure and Transport (2016). Highway Bridge Design Specifications (Limit State Design).

[6] Oehlers, D.J., Bradford, M.A. (1995). Composite Steel and Concrete Structural Members: Fundamental Behaviour. Pergamon Press, Oxford, UK

[7] Park, J.C., Park, C.M. (2004). “Experimental study on the flexural behavior of composite rahmen bridge.” Journal of the Korean Society of Civil Engineers, Vol. 24, No. 1A, pp. 123-130.

Journal of the Society of Disaster Information ISSN:1976-2208(Print) 2671-5287(Online) 한국재난정보학회논문집

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