Title

Post-punching capacity of flat-plate floor systems

Editors

M. Sasani, S. Orton (Eds.)

Document Type

Conference Proceeding

Publication Date

1-1-2016

Publication Title

American Concrete Institute, ACI Special Publication

Publisher

American Concrete Institute

Volume

January

Issue

SP 309

First page number:

55

Last page number:

65

Abstract

In the case of a punching shear failure of a slab-column connection, a certain degree of resistance to a progressive collapse in a flat-plate structure can be provided by post-punching capacity. Understanding the behavior of slab-column connections after punching shear failure is critical to understanding if the post-punching capacity could be used to limit the progression of collapse in flat-plate structures. This paper presents test results of eight isolated slab-column specimens with three main variables to investigate post-punching capacity: tensile reinforcement ratio, anchorage of tensile reinforcement, and static or dynamic loading. The results showed that post-punching capacity in slab-column connections with discontinuous compressive reinforcement and no anchorage of the tensile reinforcement was on average 53% of the punching load in static tests. However, this capacity existed only immediately after a punching failure and the residual capacity quickly dropped off as the reinforcing bars were ripped out of slab concrete. If the tensile reinforcing bars were anchored into slab, the post-punching capacity reached 80% of punching capacity with an increasing post-punching capacity with displacement until tensile rupture of the top reinforcement.

Keywords

Anchorage; Flat plate; Integrity reinforcement; Post-punching; Punching shear; Reinforcement ratio

Language

English


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