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Evaluation on Structural Performance of Precast Bridge Deck Joint using HSFRC

고강도 강섬유보강콘크리트를 적용한 프리캐스트 바닥판 이음부의 구조성능 평가

  • Received : 2017.10.12
  • Accepted : 2017.10.23
  • Published : 2017.11.01

Abstract

In precast deck system, structural performance and serviceability are mostly determined by the connection methods between the precast decks. This study proposes precast deck system with asymmetric ribbed connection details using High Strength Fiber Reinforced Concrete(HSFRC) with filler. To verify the proposed method, the flexural performance experiment was carried out with variation of joint cross section type and splice rebar details. From the test results, regardless of joint details, spliced tensile rebars of specimens were deformed to yielding strain level. Also, all types of specimens resulted in sufficient flexural performance. These test results show that the minimum lap splice length specified in current Korea Highway Bridge Design Code is conservative for precast deck joint using HSFRC. Therefore, splice details can be simplified and joint width can be reduced by using HSFRC with filler between the precast decks, and the proposed precast deck systems can be applied to the connection part of precast decks effectively.

프리캐스트 바닥판 공법은 바닥판간 이음부가 존재하며, 이음부의 연결성능에 따라 전체 교량 구조물의 성능이 좌우되므로 이음부의 연결성능 확보가 중요한 요소이다. 본 연구에서는 고강도 강섬유보강콘크리트(High Strength Fiber Reinforced Concrete, HSFRC)가 적용된 비대칭 요철형 이음단면을 갖는 연결형식을 제안하였으며, 이음부의 단면형태, 철근 겹침이음길이 및 겹침이음 형식에 따른 구조실험을 수행하여 제안된 연결형식의 휨 성능을 평가하였다. 실험결과, 이음부 상세에 관계없이 이음철근은 항복변형률 수준의 인장변형을 나타내었으며, 제안된 연결형식은 충분한 휨 저항성능을 확보하는 것으로 나타났다. 이러한 실험결과는, 현행 도로교설계기준의 최소 겹침이음길이에 대한 규정은 이음부 채움재로 HSFRC를 적용한 프리캐스트 바닥판 이음부에서는 보수적인 규정임을 알 수 있다. 따라서 이음부 채움재로 HSFRC를 사용함에 의해 철근 겹침이음 상세의 단순화 및 이음부 폭의 감소가 가능하며, 제안된 연결형식은 프리캐스트 바닥판 이음부에 효과적으로 적용 가능할 것으로 판단된다.

Keywords

References

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