Title:
Influence of Slab Thickness on Punching Shear Strength
Author(s):
Gerd Birkle and Walter H. Dilger
Publication:
Structural Journal
Volume:
105
Issue:
2
Appears on pages(s):
180-188
Keywords:
flat slab; punching shear; reinforcement; shear; stud.
DOI:
10.14359/19733
Date:
3/1/2008
Abstract:
Tests to study the influence of slab thickness on the punching shear strength of flat slabs clearly demonstrate the significant effect of size on the shear stress resistance, particularly for tests without shear reinforcement. New tests in which the slab thickness varied between 160 and 300 mm (6.3 and 11.8 in.) and tests by others with slabs up to 500 mm (19.7 in.) thick indicate that slabs without shear reinforcement thicker than approximately 260 mm (10.2 in.) may not have a high factor of safety if designed according to ACI 318-05. For thick slabs with shear reinforcement, the shear stress resistance provided by concrete is also reduced but to a lesser degree.