Long-Term Behavior of Continuous Composite Concrete Slabs with Steel Decking

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Title: Long-Term Behavior of Continuous Composite Concrete Slabs with Steel Decking

Author(s): Alireza Gholamhoseini, R. Ian Gilbert, and Mark Bradford

Publication: Structural Journal

Volume: 115

Issue: 2

Appears on pages(s): 439-449

Keywords: continuous composite slabs; creep; deflection; profiled steel decking; shrinkage

Date: 3/1/2018

Abstract:
Relatively little research has been reported on the time-dependent in-service behavior of continuous composite concrete slabs with profiled steel decking as permanent formwork and little guidance is available for calculating long-term deflections. The drying shrinkage profile through the thickness of a composite slab is greatly affected by the impermeable steel deck at the slab soffit, and this has only recently been quantified. This paper presents the results of long-term laboratory tests on continuous composite slabs subjected to both drying shrinkage and different levels of sustained load. It provides experimental evidence of the dominant role played by drying shrinkage in the long-term deflection and redistribution of internal actions in continuous composite slabs. An analytical procedure for determination of the time-dependent deflections in continuous composite slabs is described and the results of analyses are presented and compared with the test data.