Camber in Prestressed Concrete Beams


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Title: Camber in Prestressed Concrete Beams

Author(s): D. E. Branson and A. M. Ozell

Publication: Journal Proceedings

Volume: 57

Issue: 6

Appears on pages(s): 1549-1574

Keywords: none

Date: 6/1/1961

Investigation examined experimentally the initial-plus-time- dependent camber deformation in both noncomposite and composite prestressed concrete beams. Meth-ods for calculating these deformations relative to certain properties of the concrete bre presented. Ten noncomposite beams and five composite beams were used in the Total camber deformation was found to follow closely the prestress level (relative to concrete strength) but to be relatively insensitive to different concrete strengths and atmospheric conditions. Total camber appears to reach its ultimate value relatively early (100 to 200 days for the test beams) compared to the long-time shrinkage and creep strains that occur. The analytical methods set forth for predicting camber deformation in both noncomposite and composite beams were found to be in good agreement with the test results. The necessary concrete coefficients for the analysis of total camber were experimentally determined and are presented here and recommended for design purposes.