Title:
Analytical Computation of the Punching Strength
of Reinforced Concrete
Author(s):
Philippe Menetrey
Publication:
Structural Journal
Volume:
93
Issue:
5
Appears on pages(s):
503-511
Keywords:
failure; flat concrete slabs; punching shear; reinforced con-cretes;
shear strength.
DOI:
10.14359/9708
Date:
10/1/1996
Abstract:
An analytical expression developed to compute the punching strength of reinforced concrete is derived from results obtained with numerical simula-tion of the failure phenomenon. This simulation reveals that punching strength can be computed by integrating the vertical tensile stresses (assumed constant) around the punching crack (assumed to be a truncated cone in shape). Punching strength is also expressed in terms of the tensile strength of concrete, percentage of flexural reinforcement, slab thickness, and radius of punching crack initiation. The effects of reinforcement are taken into account in a unified approach by adding the vertical tensile resistance of each type of reinforcement. Punching strength computed with the developed analytical expression enables prediction of the experimental punching loads of slabs with different sizes, concrete strengths, and percentages of reinforcement, reinforced with ring reinforcement, orthogonal reinforcing bars, stirrups, shearhead, and prestressing tendons.