Title: Experimental Investigations on Punching Behavior of Reinforced Concrete Footings

Author(s): Josef Hegger, Alaa G. Sherif, and Marcus Ricker

Publication: Structural Journal

Volume: 103

Issue: 4

Appears on pages(s): 604-613

Keywords: footing; punching shear; reinforced concrete; shear strength; soil pressure

DOI: 10.14359/16437

Date: 7/1/2006

Abstract:
Five reinforced concrete footings were tested to investigate the punching shear failure of footings realistically supported on sand. The tested specimens had different slab thicknesses and reinforcement ratios. The consistency of the sand was also varied as a test parameter (dense and loose). Four footings had no shear reinforcement, whereas the remaining one included shear reinforcement consisting of vertical bars mechanically anchored at top and bottom by welded anchor plates. The experimental results indicate that the angle of the failure shear crack is steeper than observed by punching tests of flat slabs. Furthermore, the shear slenderness seems to significantly affect the punching shear capacity. In addition to the experimental program, tests from the literature are critically reviewed and a test data bank is established. ACI and Eurocode 2 provisions and rules for the design of footings are compared with the present test results as well as the test data bank.