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

Abstract

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.

Keywords

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

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