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Weiwei Lin,Teruhiko Yoda,Yoji Kumagai,Takeshi Saigyo 한국강구조학회 2013 International Journal of Steel Structures Vol.13 No.4
As the Japan bridge inventory ages and traffic volumes increase, the government is spending more on maintaining theirexisting structures to extend the service life of the current bridge inventory. This includes two-girder bridges that are classifiedas fracture critical and non-redundant. Owing to the increased inspection costs associated with these fracture-critical bridges,there is a need to evaluate alternate load paths and to implement retrofit methods on existing bridge structures to avoid bridgereplacement. In this paper, fracture redundancy of the two-girder bridge is investigated through a case study for a three-spancontinuous twin I-girder bridge. The finite element analysis is carried out to evaluate the load-carrying capacity after fractureof a girder of the two-girder bridge. Damage of studs near the moment contra-flexure regions are also considered in this study. Spacing between the transverse beams is discussed as possible techniques to improve redundancy and reduce the fracturepotential of two-girder bridge structures. The concrete slab is indicated to be a significant member for guarantying theredundancy of the two-girder steel-concrete composite bridges.