Differential Shrinkage in Composite Beams


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Title: Differential Shrinkage in Composite Beams

Author(s): Halvard W. Birkeland

Publication: Journal Proceedings

Volume: 56

Issue: 5

Appears on pages(s): 1123-1136

Keywords: none

Date: 5/1/1960

Due to normal aging and curing processes, shrinkage occurs in a slab when it is cast onto precast prestressed beams. This shrinkage induces stress into the composite beam and slab construction causing the beams to deflect. An analytical method is presented for predicting the sag. Equations are given for stresses on slab and beam section, shear and moment at the interface, and slope and deflec-tion. This is followed by comparison of computed values with actual values obtained from full size test beams. Values are in close agreement.