A Study on Strengthening of Steel Girder Bridge using Multi-Stepwise Thermal Prestressing Method

다단계 온도프리스트레싱을 이용한 강거더교의 보강에 관한 연구

  • 김상효 (연세대학교 사회환경시스템공학부) ;
  • 김준환 (연세대학교 토목공학과) ;
  • 김준환 (연세대학교 토목공학과)
  • Received : 2006.09.15
  • Accepted : 2006.10.26
  • Published : 2006.12.27

Abstract

Traditional external post-tensioning method using either steel bars or tendons is commonly used as a retrofitting method for steel composite bridges. However, the method has some disadvantages such as stress concentration at anchorages and inefficient load-carrying capability of live loads. Multi-stepwise prestressing method using thermal expanded coverplate is a newly proposed prestressing method, which was originally developed for prestressing steel structures. A new retrofitting method for steel girder bridges founded on a simple concept of thermal expansion and contraction of cover plate, the method is a hybrid of and combines the advantages of external post-tensioning and thermal prestressing. In this paper, basic concepts of the method are presented and an illustrative experiment is introduced. From actual experimental data, the thermal prestressing effect was substantiated and the FEM approach for its analysis was verified. The retrofitting effects ofa single-span bridge were analyzed and the feasibility of the developed method was examined.

Acknowledgement

Supported by : (주)승화이엔씨, 교육인적자원부

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