Long-Term Behavior of Continuous Precast Concrete Girder Bridge Model
Publication: Journal of Bridge Engineering
Volume 5, Issue 1
Abstract
Continuous concrete box girder bridges composed of precast reinforced and prestressed concrete beams with a U cross section and a cast-in-place top slab are frequently used for medium spans due to their competitiveness. The service behavior of such bridges is very much influenced by their segmental construction, due to time-dependent materials behavior that makes it difficult to accurately predict the stresses, strains, and deflections at long term. A 1:2 scale model of a two-span continuous bridge was tested in order to study its behavior during the construction process and under permanent loads. Time-dependent concrete properties, as well as support reactions, deflections, and strains in concrete and steel, were measured for 500 days. Important time-dependent redistributions of stresses and internal forces throughout the bridge were also measured. The test results were compared with analytical predictions obtained by means of a numerical model developed for the nonlinear and time-dependent analysis of segmentally erected, reinforced and prestressed concrete structures. Generally good agreement was obtained, showing the adequacy of the model to reproduce the structural effects of complex interactive time-dependent phenomena.
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Information & Authors
Information
Published In
Journal of Bridge Engineering
Volume 5 • Issue 1 • February 2000
Pages: 22 - 30
History
Received: Jun 2, 1998
Published online: Feb 1, 2000
Published in print: Feb 2000
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