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Design of longitudinal prestress of precast decks in twin-girder continuous composite bridges  

Shim, Chang Su (중앙대학교 토목공학과)
Kim, Hyun Ho (중앙대학교 건설환경연구소)
Ha, Tae Yul (중앙대학교 토목환경공학과)
Jeon, Seung Min (중앙대학교 토목환경공학과)
Publication Information
Journal of Korean Society of Steel Construction / v.18, no.5, 2006 , pp. 633-642 More about this Journal
Abstract
Serviceability design is required to control the cracking at the joint of precast decks with longitudinal prestress in continuous composite bridges. Details of twin-girder bridges are especially complex not only due to their main reinforcements and transverse prestresses for the design of long-span concrete slabs, but also due to the shear pockets for obtaining the composite action. This paper suggests the design guidelines for the magnitude of the effective prestress and for the selection of filling materials and their requirements that would allow for the use of precast decks for twin-girder continuous composite bridges. The necessary initial prestress was also evaluated through long-term behavior analysis. From the analysis, existing design examples were revised and their effectiveness was estimated. When a filling material with a bonding strength higher than the requirement is used in the region of a high negative moment, a uniform configuration of the longitudinal prestressing steels along thewhole span length of continuous composite bridges can be achieved, which would result in the simplification of the details and the reduction of the construction costs.
Keywords
continuous composite bridge; precast deck; longitudinal prestress; crack control; filling material;
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