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PROCEEDINGS OF THE TWELFTH INTERNATIONAL CONFERENCE ON COMPUTATIONAL STRUCTURES TECHNOLOGY
Time-Dependent Deflection of Composite Concrete Slabs with Profiled Steel Decking
A. Gholamhoseini, R.I. Gilbert and M.A. Bradford
Centre for Infrastructure Engineering and Safety, The University of New South Wales, Sydney, Australia
A. Gholamhoseini, R.I. Gilbert, M.A. Bradford, "Time-Dependent Deflection of Composite Concrete Slabs with Profiled Steel Decking", in , (Editors), "Proceedings of the Twelfth International Conference on Computational Structures Technology", Civil-Comp Press, Stirlingshire, UK, Paper 5, 2014. doi:10.4203/ccp.106.5
Keywords: composite slabs, creep, deflection, profiled steel decking, serviceability, shrinkage, time-dependent..
In this paper, an analytical approach is presented to determine the time-dependent deformation of composite concrete slabs under sustained service loads in a drying environment. 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. Recent laboratory tests conducted by the authors have resulted in the development of a relatively simple mathematical model of the shrinkage profile through the thickness of a composite slab. Using a layered model to facilitate the input of the non-linear shrinkage profile through the thickness of the slab and the age-adjusted effective modulus method to analyse the time-varying cross-sectional response, the proposed analytical approach is capable of predicting the redistribution of stresses between the concrete and the steel deck with time, as well as the long-term deformations. The analytical approach has been used to analyse a range of single-span and continuous composite slabs that have been subjected to sustained loads for a period of over 400 days. The calculated deformations are in excellent agreement with the measured results.
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