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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Title: Prediction of Deflections of Two-Way Floor Systems
Author(s): Amin Ghali
Publication: Structural Journal
Appears on pages(s): 551-562
Keywords: cracking (fracturing); creep; deflection; flat concrete plates; floors; shrinkage; slabs; stiffness; tension; two-way slabs; Design
Abstract:Inaccuracy in deflection prediction in reinforced concrete floors is caused by errors in the parameters related to material properties by the method of calculation. This paper attempts to eliminate or reduce the last source of error. The bending moments normally determined in design for column and middle strips are used to calculate basic deflection values using properties of the gross concrete section and ignoring the presence of reinforcement, cracking, creep, and shrinkage. These effects are accounted for by use of coefficients that are functions of the cross-sectional properties, modulus of elasticity of steel and concrete, creep, and aging coefficients. Simple equations are derived for the coefficients based on compatibility and equilibrium. A numerical example of deflection prediction is included.
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