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J. Korean Soc. Hazard Mitig. > Volume 19(1); 2019 > Article
시설물방재
Journal of the Korean Society of Hazard Mitigation 2019;19(1):231-239.
DOI: https://doi.org/10.9798/KOSHAM.2019.19.1.231    Published online February 28, 2019.
SFRC로 보강된 파형강판 합성부재의 압축 및 휨거동 평가
오홍섭
정회원, 경남과학기술대학교 토목공학과 교수
Verification of Compressive and Flexural Behavior of Corrugated Steel Plates Composite Section with SFRC
Hongseob Oh
Member, Professor, Department of Civil Engineering, Gyeongnam National University of Science and Technology
Corresponding author:  Hongseob Oh, Tel: +82-55-751-3299, Fax: +82-55-751-3209, 
Email: opera69@chol.com
Received: 29 November 2018   • Revised: 3 December 2018   • Accepted: 11 December 2018
Abstract
To increase the span of the buried structure using corrugated steel plates, concrete composite section is being increasingly applied; however, it increases the risk of brittle fracture of the structure because bending and compressive stress by moving loads such as overpassing vehicles act simultaneously. In this study, steel fiber reinforced concrete was applied to the composite section to secure the ductility and to analyze the compression and flexural behavior experimentally. As the structure becomes larger, the flexural and compressive stress act simultaneously on the composite section of the corrugated steel plate structures. This study experimentally verified the compressive and flexural behavior of the steel plate composite section with steel fiber reinforced concrete. Moreover, the structural performance of the revised corrugated steel plate composite section applied with SFRC and triangular confinement rebar to control brittle failure at the lap joints and enhance serviceability were experimentally verified. The test results show that the compressive strength of the composite section increased by 10% or more when the fiber reinforced concrete was applied. The concrete composite section under axial loads is dominantly performed by the resistance of the reinforced concrete section without the contribution of steel plate up to the cracking load, but after the cracking load, the core concrete section inside the confinement rebar and the lap connected steel plate become resistant to the external loads. The flexural behavior under yield loads was dominated by the internal resistance moments of the steel bars and corrugated steel plates, and then the concrete section as well as the rebar and steel plates was partially contributed to the flexural strength after yield loads.
Key Words: Compressive Strength, Flexural Strength, Corrugated Steel Plate Composite Section, Steel Fiber Reinforced Concrete
요지
지중 파형강판 구조체의 대형화를 위하여 콘크리트합성단면을 적용하는 사례가 증가하고 있으며, 구조물 상부에 차량이 통과하는 경우에는 휨과 압축응력이 동시에 작용하기 때문에 취성파괴의 위험이 높아지게 된다. 본 연구에서는 연성을 확보하기 위하여 합성단면에 강섬유보강콘크리트를 적용하여 압축 및 휨거동을 실험적으로 분석하고자 하였다. 특히 연결부의 취성파괴를 억제하고, 사용성능 향상을 위하여 섬유보강콘크리트를 적용하고 구속철근의 형상을 변화시킴으로 구조거동의 향상정도를 평가하고자 하였다. 실험결과 섬유보강콘크리트를 적용하는 경우 압축강도가 10%이상 증진되는 것으로 분석되었으며, 주철근량을 15%정도 감소시켜도 압축 및 휨강도 저하는 거의 없는 것으로 나타났다. 콘크리트 합성단면의 축하중은 균열하중까지는 콘크리트 단면에 의해 지배되고, 균열하중이후에는 심부콘크리트 단면과 강판이음부 강도에 의해 지배되는 것으로 분석되었다. 휨거동은 철근과 파형강판이음부의 내부저항모멘트에 의해 지배되며, 최대강도는 콘크리트가 일정부분 기여하는 것으로 분석되었다.
핵심용어: 압축강도, 휨강도, 파형강판 합성단면, 강섬유보강콘크리트


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