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Stud and Puzzle-Strip Shear Connector for Composite Beam of UHPC Deck and Inverted-T Steel Girder

초고성능 콘크리트 바닥판과 역T형 강거더의 합성보를 위한 스터드 및 퍼즐스트립 전단연결재에 관한 연구

  • Lee, Kyoung-Chan (High-Speed Railroad System Research Center, Korea Railroad Research Institute) ;
  • Joh, Changbin (Structural Engineering Research Division, Korea Institute of Construction Technology) ;
  • Choi, Eun-Suk (Structural Engineering Research Division, Korea Institute of Construction Technology) ;
  • Kim, Jee-Sang (Dept. of Civil & Architectural Engineering, Seokyeong University)
  • 이경찬 (한국철도기술연구원 고속철도연구본부) ;
  • 조창빈 (한국건설기술연구원 인프라구조연구실) ;
  • 최은석 (한국건설기술연구원 인프라구조연구실) ;
  • 김지상 (서경대학교 토목건축공학과)
  • Received : 2013.09.13
  • Accepted : 2013.12.20
  • Published : 2014.04.30

Abstract

Since recently developed Ultra-High-Performance-Concrete (UHPC) provides very high strength, stiffness, and durability, many studies have been made on the application of the UHPC to bridge decks. Due to high strength and stiffness of UHPC bridge deck, the structural contribution of top flange of steel girder composite to UHPC deck would be much lower than that of conventional concrete deck. At this point of view, this study proposes a inverted-T shaped steel girder composite to UHPC deck. This girder requires a new type of shear connector because conventional shear connectors are welded on top flange. This study also proposes three different types of shear connectors, and evaluate their ultimate strength via push-out static test. The first one is a stud shear connector welded directly to the web of the girder in the transverse direction. The second one is a puzzle-strip type shear connector developed by the European Commission, and the last one is the combination of the stud and the puzzle-strip shear connectors. Experimental results showed that the ultimate strength of the transverse stud was 26% larger than that given in the AASHTO LRFD Bridge Design Specifications, but a splitting crack observed in the UHPC deck was so severe that another measure needs to be developed to prevent the splitting crack. The ultimate strength of the puzzle-strip specimen was 40% larger than that evaluated by the equation of European Commission. The specimens combined with stud and puzzle-strip shear connectors provided less strength than arithmetical sum of those. Based on the experimental observations, there appears to be no advantage of combining transverse stud and puzzle-strip shear connectors.

Acknowledgement

Supported by : 한국에너지기술평가원(KETEP)

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Cited by

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  2. A Study on the Experiment of Flexural Behavior of Composite Beam with Steel Fiber Reinforced UHPC and Inverted-T Steel Considering Compressive Strength Level vol.27, pp.6, 2015, https://doi.org/10.4334/JKCI.2015.27.6.677
  3. Experiment of Flexural Behavior of Composite Beam with Steel Fiber Reinforced Ultra High Performance Concrete Deck and Inverted-T Steel Girder vol.26, pp.6, 2014, https://doi.org/10.4334/JKCI.2014.26.6.761