Journal of the Korea Concrete Institute (콘크리트학회논문집)

Korea Concrete Institute (한국콘크리트학회)
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Analysis Evaluation of Torsional Behavior of Hybrid Truss Bridge according to Connection Systems

격점구조형식에 따른 복합트러스교의 비틀림 거동 해석

  • Choi, Ji-Hun (School of Civil and Environmental Engineering, Yonsei University) ;
  • Jung, Kwang-Hoe (Research and Development Division of Hyundai Engineering and Construction) ;
  • Kim, Tae-Kyun (School of Civil and Environmental Engineering, Yonsei University) ;
  • Lee, Sang-Won (School of Civil and Environmental Engineering, Yonsei University) ;
  • Kim, Jang-Ho Jay (School of Civil and Environmental Engineering, Yonsei University)
  • 최지훈 (연세대학교 사회환경시스템공학부) ;
  • 정광회 (현대건설(주) 연구개발본부) ;
  • 김태균 (연세대학교 사회환경시스템공학부) ;
  • 이상원 (연세대학교 사회환경시스템공학부) ;
  • 김장호 (연세대학교 사회환경시스템공학부)
  • Received : 2012.12.10
  • Accepted : 2013.12.30
  • Published : 2014.02.28
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Abstract

Hybrid Truss Bridge (HTB) uses steel truss webs instead of concrete webs in prestressed box girder bridges, which is becoming popular due to its structural benefits such as relatively light self-weight and good aesthetics appearance. Since the core technology of this bridge is the connection system between concrete slabs and steel truss members, several connection systems were proposed and experimentally evaluated. Also, the selected joint system was applied to the real bride design and construction. The research was performed on the connection system, since it can affect the global behavior of this bridge such as flexural and fatigue behaviors as well as the local behavior around the connection region. The evaluation study showed that HTB applied to a curved bridge or an eccentrically loaded bridge had a weak torsional capacity compared to an ordinary PSC box girder bridge due to the open cross-sectional characteristic of HTB. Therefore, three types of girders with different joint system between truss web member and concrete slab were tested for their torsional capacity. In this study, the three different types of HTB girders under torsional loading were simulated using FEM analysis to investigate the torsional behavior of HTB girders more in detail. The results are discussed in detail in the paper.

복합트러스교는 프리스트레스 박스거더교의 복부를 강재 트러스로 대체한 교량으로 자중이 경감되는 구조적 장점과 복부 개방구조로 인한 경관성이 매우 우수하여 최근 들어 많이 사용되고 있다. 이러한 복합트러스교의 핵심기술은 강재 트러스와 콘크리트 슬래브를 연결하는 격점구조이며 지금까지 여러가지 격점구조들이 개발되어 실험적 검증을 통해서 실교량에 적용해 오고 있다. 이러한 격점구조는 격점부 국부적인 거동뿐만 아니라 복합트러스 거더의 휨 및 피로 등 전체적인 거동을 좌우하기 때문에 이에 대한 연구가 계속 진행되고 있다. 한편, 복합트러스 교량의 복부 개방구조는 프리스트레스 박스교량에 비해 비틀림 성능을 저하시키는 단점을 가지고 있어 편심하중을 받는 교량이나 곡선교 등에는 아직까지 적용된 사례가 없다. 따라서 복합트러스교가 보다 널리 사용되기 위해서는 비틀림 거동에 대한 정확한 분석이 필요한 상황이다. 기존 연구에서는 복합트러스교의 격점구조형식에 따른 비틀림 거동 특성을 알아보기 위해서 3가지 형태의 박스형 복합트러스 실험체를 제작하여 그 거동을 분석하였다. 이에 이 연구에서는 기존연구를 바탕으로 유한요소 해석프로그램을 이용하여 실험체를 모델링하고 시뮬레이션을 통해 그 거동을 분석하여 해석적으로 검증해 보았다.

Keywords

References

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