Spliced Segmental Recast Concrete Bridges Using Staged Post-Tensioning

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Title: Spliced Segmental Recast Concrete Bridges Using Staged Post-Tensioning

Author(s): D. I. Harvey

Publication: Special Publication

Volume: 93

Issue:

Appears on pages(s): 721-736

Keywords: box beams; bridge anchorages; bridges (structures); continuity (structural); diaphragms (concrete); girders; I-beams; post-tensioning; precast concrete; prestressing steels; pretensioning; segmental construction; splicing

Date: 9/1/1986

Abstract:
Precast concrete I-girder sections are widely used in bridge construction in British Columbia. A good deal of attention has been paid to methods of splicing girder segments to achieve structural continuity or to extend the span range to which the girders can be applied. A promising development has been the hybrid girder design, whereby pretensioned I-girders are spliced and post-tensioned in the field to achieve con-tinuity. The same technique can be used for precast box-girders which are especially suited to bridges where plan curvature is involved. More structural efficiency and deck durability can be achieved by applying additional post-tensioning after construc-tion of the cast-in-place concrete deck. Four examples of recent bridges using this technique are reviewed, while the limitations and scope for future development are discussed.