[ Article ]

Journal of Korean Society of Steel Construction - Vol. 36, No. 6, pp.377-387

ISSN: 1226-363X (Print) 2287-4054 (Online)

Print publication date 27 Dec 2024

Received 24 Oct 2024 Revised 27 Nov 2024 Accepted 28 Nov 2024

DOI: https://doi.org/10.7781/kjoss.2024.36.6.377

CFT 모듈을 이용한 단면개선 연속 강박스 거더의 하중저항 효과 분석

이학준¹ ; 하태열² ; 조광일³ ; 안진희⁴^{, *}

1박사과정, 경상국립대학교, 건설시스템공학과
2부장, (주)택한, 연구개발팀
3팀장, (주)택한, 연구개발팀
4교수, 경상국립대학교, 건설시스템공학과

Load Resistance Effect Analysis of the Continuous Steel Box Girder with the Cross-sectional Improvement by CFT Modules

Lee, Hak Joon¹ ; Ha, Tae-Yul² ; Cho, Kwang-Il³ ; Ahn, Jin-Hee⁴^{, *}

1Ph.D. Student, Dept. of Civil and Infrastructure Engineering, Gyeongsang National University, JinJu, 52725, Korea
2Manager, Tekhan Inc., Dept. of R&D Team, Uiwang, 16006, Korea
3Director, Tekhan Inc., Dept. of R&D Team, Uiwang, 16006, Korea
4Professor, Dept. of Civil and Infrastructure Engineering, Gyeongsang National University, JinJu, 52725, Korea

Correspondence to: ^*Tel. +82-55-772-3293 Fax. +82-55-772-3209 E-mail. jahn@gnu.ac.kr

초록

CFT 모듈을 이용한 개구제형 연속 강박스 거더의 단면응력 개선방법은 부모멘트 영역의 강박스 내부에 콘크리트 충전 강관(CFT) 모듈을 설치하여 단면력을 향상시키고 추가적인 프리스트레싱을 도입하여 하부플랜지의 응력상태를 개선하는 공법이다. 본 연구에서는 CFT 모듈을 이용한 연속 강박스 거더의 단면응력 개선방법의 효과를 알아보기 위하여 실험과 수치해석을 수행하였으며, 이를 위하여 하부플랜지에 CFT 모듈을 설치한 강박스 시험체를 제작하고 프리스트레싱 하였으며 3점 휨시험을 실시하여 시험체의 단면응력 거동을 확인하였다. CFT 모듈을 이용한 프리스트레싱과 3점 휨시험은 유한요소해석을 통하여 검증하였으며 검증된 모델을 이용하여 CFT 모듈의 제원에 따라 변화하는 단면응력상태를 비교하였다. CFT 모듈의 제원에 따른 유한요소해석 결과, 강박스 거더 내부에 CFT 모듈의 설치함으로써 강박스 거더의 단면적이 증가하여 단면의 강성을 높일 수 있고, 추가적인 프리스트레싱을 도입하여 부모멘트 영역의 강박스 거더 단면을 개선시킬 수 있는 것으로 나타났다.

Abstract

The continuous open-top steel box girders with improved cross-sections by CFT modules reduce cross-sectional stresses by installing concrete-filled steel tubes(CFT) in the hogging moment region. In this study, an experimental and numerical analysis was conducted to investigate the effects of a method for reducing a cross-sectional stress for continuous steel box girders using CFT members. To analyze the cross-sectional improvement for continuous steel box girder by CFT modules, a steel box specimen with a CFT module was fabricated, and induced prestress in steel box specimen by CFT modules. And confirmed the cross-sectional stress behavior of the steel box specimen through the three-point flexural test. The prestressing test using CFT modules and the three-point flaexural test were verified through finite element analysis(FEA), and compared the cross-sectional stresses under the same condition depending on the cross-section of the CFT module. The results of the finite element analysis depending on the cross-section of the CFT module showed that as the cross-section of the CFT module increased under the same load conditions, the stress of the lower flange of the steel box girder decreased due to the increase in cross-sectional stiffness. In addition, Inducing prestress for the steel box girder confirmed to improve the cross-section of steel box girder in the hogging moment region.

Keywords:

Continuous open-top steel box girder, Hogging moment region, CFT module, Prestressing test, Flexural test

키워드:

개구제형 연속 강박스 거더, 부모멘트 영역, CFT 모듈, 프리스트레싱 시험, 휨 시험

Acknowledgments

본 연구는 국토교통부 국토교통기술촉진연구사업(과제번호: 22CTAP-C163558-02)의 연구비 지원으로 수행되었으며, 이에 감사드립니다.

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