Design of Large Footings for One-Way Shear


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Title: Design of Large Footings for One-Way Shear

Author(s): Almila Uzel, Bogdan Podgorniak, Evan C. Bentz, and Michael P. Collins

Publication: Structural Journal

Volume: 108

Issue: 2

Appears on pages(s): 131-138

Keywords: footings; shear; size effect; strut-and-tie; uniformly loaded members

Date: 3/1/2011

Because ACI design procedures do not account for the size effect in shear, there is concern that these procedures may be unconservative for large concrete footings not containing shear reinforcement. This paper describes an experimental program involving 16 specimens designed to investigate the one-way shear strength of footings of different thicknesses, slenderness ratios, and applied loading patterns. Analytical studies were also performed to evaluate the accuracy of currently available design procedures. It was found that a combination of sectional models to predict the flexural and shear capacities of slender footings and strut-and-tie models to predict the shear capacity of footings with low slenderness ratios gave accurate results.