Design Charts For Composite Slab Of 80mm And 100mm Concrete Thicknesses

The use of steel deck in the construction of floors began in the 1920’s. The concept of usingrnsteel deck to act compositely with the concrete slab began in the 1950’s. A composite slabrncomprises steel decking, reinforcement and cast in situ concrete. Modern profiled steel arernmostly designed to act as both formwork and Composite slabs.rnComposite construction in Ethiopian has not yet developed. This can be due to manyrnfactors. But to name a few, unavailability of the profile sheet locally and limited exposure torncomposite steel decks are some factors.rnIn this thesis work, three analytic methods to calculate the capacity of composites is used.rnThese are the full flexural method, first yield method and ASCE appendix D method.rnThe full flexural method assumes that full interaction is present between the concreternsection and profile steel sheet. The First Yield Method predicts the slab capacity to be thernload that causes the bottom flange of the deck to reach yield stress. The Alternate AppendixrnD Method considers the shear transfer ability of different decks by the application ofrnrelaxation factors that describe the deck and embossment properties. The design strength isrnthe multiplication product of the first yield strength and the relaxation factor.rnBased on these three analytic methods, design charts for different combinations of crossrnsectional values and material properties are developed.

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