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Evaluation on Structural Performance of Joint with Asymmetric Ribbed Connection Details used in Precast Bridge Deck

비대칭 격벽단면을 갖는 프리캐스트 바닥판 이음부의 구조성능 평가

  • Chung, Chul-Hun (Dept. of Civil & Environmental Engineering, Dankook University) ;
  • Byun, Tae-Kwan (Dept. of Civil & Environmental Engineering, Dankook University) ;
  • Kim, In-Gyu (Daewoo Institute of Construction Technology) ;
  • Shin, Dong-Ho (Daewoo Institute of Construction Technology) ;
  • Lee, Han-Joo (Dept. of Civil & Environmental Engineering, Dankook University)
  • Received : 2016.11.14
  • Accepted : 2017.02.06
  • Published : 2017.04.30

Abstract

A precast concrete deck system is considered an effective alternative in terms of its rapid construction and quality assurance than cast-in-place concrete deck. In precast concrete deck system, structural performance and serviceability are mostly determined by the connection methods between the precast decks. This research proposes more improved precast deck system with asymmetric ribbed connection details improving the disadvantage of previous precast deck system such as difficulties in assembling precast decks. And in this precast deck system, a separate form is not required at the site because partition wall of the precast decks serves as a form when placing non-shrinkage mortar in the connection part of the precast decks. Therefore, rapid construction is possible. Flexural performance is verified through load tests considering main parameter such as rib length in the precast deck connection. From the test results, it can be inferred that the development of the rebar and prevention of adhesion failure in the partition wall of the precast deck system are important factors in securing the flexural performance. Although the structural performance of the precast deck system with asymmetric connection details is gradually reduced as the rib length in the precast deck connection increases, the proposed precast deck system shows sufficient flexural performance and can be applied to the connection part of precast decks effectively.

프리캐스트 바닥판은 공기단축 및 고품질 확보라는 장점으로 인해 급속시공이 요구되는 현장에서 현장타설 바닥판의 효과적인 대안으로 평가받고 있다. 그러나 프리캐스트 바닥판 공법은 바닥판간 이음부가 존재하며, 이음부의 연결성능에 따라 전체 교량 구조물의 성능이 좌우되므로 이음부의 연결성능 확보가 중요한 요소이다. 본 연구에서는 기존의 프리캐스트 바닥판 연결시스템을 개선한 비대칭 구조의 요철형 이음단면을 갖는 연결형식을 제안하였으며, 요철의 격벽길이에 따른 구조실험을 수행하여 제안된 연결형식의 휨성능을 평가하였다. 실험결과, 본 연구에서 제안된 연결형식은 격벽 부분에서의 철근의 정착 및 부착파괴 방지가 가장 중요한 요소인 것으로 나타났으며, 이음부 단면 요철의 격벽길이를 짧게 하는 것이 일체형 구조로서의 효과를 발휘하는 데에 보다 유리한 것으로 나타났다. 요철의 격벽길이 증가에 따라 구조성능이 다소 감소되는 것으로 나타났으나 격벽의 길이와 관계없이 제안된 연결형식은 충분한 휨 저항성능을 확보하고 있으며, 프리캐스트 바닥판 이음부에 효과적으로 적용 가능할 것으로 판단된다.

Keywords

References

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