Title:
Behavior of a Thick Circular Reinforced Concrete Slab Under Two-Way Bending
Author(s):
Judith J. Stalnaker and Ernest C. Harris
Publication:
Structural Journal
Volume:
84
Issue:
2
Appears on pages(s):
113-118
Keywords:
bending; concrete slabs; finite element method; thickness; reinforced concrete; reinforcing steels; shear properties; silos; structural analysis; structural design; Structural Research
DOI:
10.14359/2795
Date:
3/1/1987
Abstract:
Elevated circular relatively thick reinforced concrete slabs, simply supported along their edges, are commonly used for bottoms of industrial storage silos. This type of slab normally represents a significant cost in a storage silo. Current practice is to design these slabs to resist radial and tangential bending moments calculated by elastic theory for thin plates, selecting thickness and reinforcing by the ACI 318 strength method. In this study, several reinforcement patterns are considered for a typical bottom slab, using nonlinear inelastic finite element analysis. The study shows that reinforcing patterns better than the one usually used are possible. Shear reinforcement, considered unnecessary for most such slabs if the methods of ACI 318 are followed, is shown to markedly increase the ultimate load for the slab. Relative values of the reinforcing patterns studied are compared by a table of efficiencies, based on capacity per dollar cost.