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.