Time-Dependent Analysis of Nonprismatic Curved PC Box Girder Bridgesby Luoxi Zhang, Shijiazhuang Railway Inst, Shijiazhuang, China,
Mingsheng Liu, Shijiazhuang Railway Inst, Shijiazhuang, China,
Lin Huang, Shijiazhuang Railway Inst, Shijiazhuang, China,
Abstract: The purpose of this paper is to present a step-by-step computer method for predicting the deflection and stress distribution duo to creep and shrinkage of concrete in nonprismatic, curved, prestressed, continuous box girder bridges. The method is based on the BP2 Model and the computer program accounts for the presence of the difference in ages of the concrete segments, the multiple stages in which the external loads and prestressing are applied, and the changes in geometry and support conditions as the construction progresses. Finally, a practical example of a cantilever cast-in-place curved box girder bridge is given.
Subject Headings: Girder bridges | Cantilever bridges | Stress distribution | Curvature | Box girders | Computer models | Bridge tests | Infrastructure construction
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