A Reliability Analysis on the To-Box Reinforcement Method of PSC Beam Bridges

PSC보의 박스화 보강방법의 신뢰성해석

  • Bang, Myung-Seok (Department of Safety Engineering, Chungju National University)
  • 방명석 (충주대학교 안전공학과)
  • Published : 2006.06.30


The goal of this study is to show the way to increase the safety of deteriorated PSC beam bridges by the to-box reinforcing method. This method is to change the open girder section into the closed box section by connecting bottom flanges of neighboring PSC girders with the precast panels embedding PS tendons at the anchor block. The box section is composed of three concrete members with different casting ages, RC slab, PSC beam, precast panel. This different aging requires a time-dependent analysis considering construction sequences. Reliability index and failure probability are produced by the AFOSM reliability analysis. Transversely five schemes and longitudinally two schemes are considered. The full reinforcing scheme, transversely and longitudinally, shows the highest reliability index, but it requires more cost for retrofit. The partial reinforcing scheme 4, 4-1 are recommended in this study as the economically best scheme.


PSC beam bridge;reinforcing method;to-box;reliability index;construction sequence;precast panel


  1. 방명석, '주형의 박스화에 의한 피씨빔교량의 보 강방법,' 특허청, 2001
  2. 홍석주, '외부 프리스트레스 도입에 의한 노후 콘 크리트교량의 성능향상에 관한 연구', 충남대학 교, 2000
  3. Rackwitz, R. and Fiesseler B., 'Structural Reliability Under Combined Random Load Sequences', Computers and Structures, Vol 9, No. 5, pp. 489-494, 1978 https://doi.org/10.1016/0045-7949(78)90046-9
  4. 건설교통부, '교량현황조서', 2003
  5. 한만엽, 정문연, '외부강선 보강용 압축형 단부 브래킷의 거동 연구', 대한토목학회 논문집, 제21 권, 제6-A호, 2001
  6. 건설교통부, '교량구조물의 보수‧보강 공법편람', 1995
  7. Ariyawarena, N. Don, G., 'Design of Precast Prestressed Concrete Members Using External Prestressing', PCI Journal, Vol. 47, No. 2, pp. 84-94, 2002 https://doi.org/10.15554/pcij.03012002.84.94
  8. 한국건설기술연구원, '외부 프리스트레스를 도입하는 구조물의 설계 및 시공에 관한 연구', 1995