A Design Perspective on Punching Shear


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Title: A Design Perspective on Punching Shear

Author(s): S.D.B. Alexander and N.M. Hawkins

Publication: Special Publication

Volume: 232


Appears on pages(s): 97-108

Keywords: flexural reinforcement; punching shear; structural design

Date: 10/1/2005

The ACI Code design equation for concentric punching shear is often criticized for failing to account for the effect of flexural reinforcement. This criticism is based on the poor performance of the code equation as a predictor of test results. However, in thecontext of design, the code works as well as any detailed analytical model available, witha fraction of the computation effort. This is because for non-prestressed slabs the codeequation correctly identifies the transition between flexural failure and shear failure,assuming the slab has been correctly designed for flexure. It is concluded that a strongargument can be made for retaining the current equation for concentric punching.