Title: Design for Punching Shear Strength with ACI 318-95

Author(s): Amin Ghali and Sami Megally

Publication: Structural Journal

Volume: 96

Issue: 4

Appears on pages(s): 539-548

Keywords: columns (supports); connections; flat concrete plates; preprestressed concrete; punching shear; raft foundations; reinforced concrete; shear strength; slabs; structural design

DOI: 10.14359/690

Date: 7/1/1999

Abstract:
Brittle punching failure of flat plates can occur due to the transfer of shearing forces and unbalanced moments between slabs and columns. Design of connections of columns to flat plates to insure safety against punching failure is presented. This paper covers the design procedure in most practical situations, including interior, edge, and corner columns; prestressed and nonprestressed slabs; slabs with openings; and slabs with shear reinforcement. The ACI 318-95 Building Code requirements are adhered to where applicable. Numerical examples are presented to demonstrate the design procedure. Seismic design considerations are not discussed in this paper.