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Shrinkage Measurements in Composite Beam Slabs

by Iyad Alsamsam, Sargent & Lundy Engineers, Chicago, United States,



Document Type: Proceeding Paper

Part of: Nondestructive Testing of Concrete Elements and Structures

Abstract:

When the concrete slab on a composite beam shrinks, it is restrained by the steel beam to which it is connected. Tensile stresses, as a result, are developed in the restrained concrete slab. The concrete stresses and the resulting steel section stresses are directly related to the long term deflections of a composite steel-concrete beam. This paper reports some of the findings obtained from monitoring four full-scale composite beams for a period of 200 days. During that period the time dependent shrinkage strains and the resulting deflection of the beams were recorded. In lights of the experimental findings, the effect of differential shrinkage in composite beams was postulated and verified. Correlations were drawn between restrained and free shrinkage in a composite slab with particular emphasis on the effect of concrete cracking.

Subject Headings: Composite beams | Shrinkage (material) | Concrete slabs | Concrete beams | Slabs | Steel beams | Time dependence

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