Journal of Korean Society of Disaster and Security (한국방재안전학회논문집)

Korean Society of Disaster & Security (한국방재안전학회)
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Fabrication Technique and Structural Performance Verification of PSC U-Type Segment Girder Using On-Site Pretension Method

현장 프리텐션 긴장 방식 적용 PSC U형 분절 거더 제작 기술 및 구조 성능 검증

  • Sangki Park (Department of Structural Engineering Research, Korea Institute of Civil Engineering and Building Technology) ;
  • Jaehwan Kim (Department of Structural Engineering Research, Korea Institute of Civil Engineering and Building Technology) ;
  • Dong-Woo Seo (Department of Structural Engineering Research, Korea Institute of Civil Engineering and Building Technology) ;
  • Ki-Tae Park (Department of Structural Engineering Research, Korea Institute of Civil Engineering and Building Technology) ;
  • Hyun-Ock Jang (J EnC Ltd)
  • 박상기 (한국건설기술연구원 구조연구본부) ;
  • 김재환 (한국건설기술연구원 구조연구본부) ;
  • 서동우 (한국건설기술연구원 구조연구본부) ;
  • 박기태 (한국건설기술연구원 구조연구본부) ;
  • 장현옥 (제이이앤씨(주))
  • Received : 2023.09.04
  • Accepted : 2023.09.13
  • Published : 2023.09.30
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Abstract

Prestressed Concrete (PSC) girders are divided into pre- and post-tension types as prestressing method, and I- and U-type as cross-sectional shape. There are both advantages and disadvantages depending on each prestressing method and cross-sectional shape, and each method is applied to bridge construction sites. In this study, a new girder design was attempted to develop that overcomes its shortcomings by using the pretension method and U-type cross sectional shape. Its structural performance was verified in this study. Pretension type girders are mainly manufactured in factories because they require a reaction arm and related facilities, and have the disadvantage of being limited in weight and span length for road transportation. In addition, in the case of the U-type cross-section, structural stability is very reliable during construction against overturning, but its own weight is relatively large comparing to I-type, and the post-tension method is mainly applied after on-site production. In this study, a PSC girder manufacturing method using the field pretension was proposed and a span length of 40 m real-scale test specimen was manufactured and verified its structural performance.

프리스트레스드 콘크리트(Prestressed Concrete, PSC) 거더는 프리텐션과 포스트텐션 긴장 방식으로 구분되고, 단면 형상에서는 I형과 U형으로 구분된다. 각 긴장 방식과 단면 형상에 따른 장단점이 있고, 각각의 방식으로 교량 건설 현장에 적용되고 있다. 본 연구에서는 프리텐션 긴장 방식과 U형 단면의 단점을 극복하여 적용한 새로운 거더 형식을 제안하고 구조 성능을 검증하고자 하였다. 프리텐션 긴장 방식의 거더는 반력대가 필요한 관계로 주로 공장에서 제작되며, 이동을 위하여 무게와 경간장이 제한되는 단점이 있다. 또한 U형 단면의 경우 전도 등 시공 시 구조 안정성이 높으나, 자중이 I형에 비해 상대적으로 커서 현장 제작 후 포스트텐션 긴장 방식이 주로 적용되고 있다. 본 연구에서는 현장 프리텐션 긴장 방식을 적용한 PSC 거더 제작 방식 제시하고 40 m급 실대형 실험체를 제작하여 구조 성능을 검증하였다.

Keywords

Acknowledgement

This work was supported by Korea Institute of Civil Engineering and Building Technology (Project Number: 20230107), granted financial resource from the Ministry of Science and ICT, Republic of Korea.

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