Deformations and Stresses in Flanged Concrete Structures Due to Temperature Differentials

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Title: Deformations and Stresses in Flanged Concrete Structures Due to Temperature Differentials

Author(s): Fahim A. Batla, Patrick R. Reisnour, and Divakar V. Pathak

Publication: Special Publication

Volume: 86

Issue:

Appears on pages(s): 395-406

Keywords: box beams; bridges (structures); deflection; defor-mation; finite element method; flanges; reinforced concrete; roofs; T-beams; temperature; thermal stresses.

Date: 8/1/1985

Abstract:
A difference in temperatures exist among the various components of a flanged concrete structure which are exposed to different ambient temperatures. An experimental study indicates that a substantial temperature differential between the top flange and the bottom portion of a prestressed concrete box girder bridge superstructure can exist due to the daily and seasonal variations of the surrounding atmospheric temperatures. This paper presents methods which may be used for the computation of deformations and stresses in concrete structures due to temperature differentials. Analyses of a T-beam and of a box girder bridge superstructure are also presented as illustrative examples. These examples indicate a need of revising the design codes to emphasize the effects of the temperature differential in flanged concrete structures.