Title:
Ductility of Flat Plates: Comparison of Shear Reinforcement Systems
Author(s):
Carl Erik Broms
Publication:
Structural Journal
Volume:
104
Issue:
6
Appears on pages(s):
703-711
Keywords:
bars; flexural capacity; loads; plates; punching shear; shear; stirrups; studs
DOI:
10.14359/18952
Date:
11/1/2007
Abstract:
Two shear reinforcement systems were tested for their ability to provide ductile behavior to flat plates. The specimens with shear studs failed in premature punching without reaching their flexural capacity Vy (corresponding to yield of all top flexural reinforcement over the specimen width) despite that their nominal punching capacity according to ACI 421.1R-99 and CEB-FIP Model Code 1990 was larger than Vy . This was found to be more serious for flat plate structures than for test specimens due to the provisions of ACI 318-05 for design and lateral distribution of the flexural reinforcement in flat plates. Proposed modification of the code provisions is therefore given. The specimens with ductility reinforcement could resist considerable additional deflection with continuously increasing loading after overall yield of the flexural reinforcement, which means that the system has good ability to sustain moment redistribution and accidental loads, and progressive collapse is prevented in a reliable way.