A Parameter Study of Factors Affecting Time-Dependent Slab Deflections


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Title: A Parameter Study of Factors Affecting Time-Dependent Slab Deflections

Author(s): Andrew Scanlon

Publication: Special Publication

Volume: 76


Appears on pages(s): 53-88

Keywords: columns (supports); concrete slabs; cracking (fractur-ing); creep properties; deflection; finite element method; loads --- (forces); reinforced concrete; reinforcing steels; shrinkage; span-depth ratio; structural analysis; tensile properties.

Date: 10/1/1982

The results of a parameter study of factors affecting time-dependent slab deflections are presented. The study is based on a finite element plate-bending analysis. Concrete is treated as an ageing linear viscoelastic material and the effects of shrinkage and cracking are included. Factors studied include creep and shrinkage, tensile behaviour of concrete, span to depth ratio, column width to span ratio, loading history, and reinforcement layout. A brief assessment is made of simplified procedures for computing slab deflections.