Punching Shear Behavior of Slabs With Varying Span-Depth Ratios

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Title: Punching Shear Behavior of Slabs With Varying Span-Depth Ratios

Author(s): John S. Lovrovich and David I. McLean

Publication: Structural Journal

Volume: 87

Issue: 5

Appears on pages(s): 507-512

Keywords: concrete slabs; punching shear reinforced concrete; reinforcing steels; shear properties; shear strength; span-depth ratio; Structural Research

DOI: 10.14359/2616

Date: 9/1/1990

Abstract:
Results of an experimental investigation of the punching shear strength of reinforced concrete slabs with varying span-depth ratios are summarized. Ten axisymmetric slabs were tested: five with flexural reinforcement and five with both flexural and shear reinforcement. The slab thickness was kept constant while the support diameter was varied to produce different span-depth ratios. The punching shear strength was found to significantly increase as the span-depth ratio decreased below 6. Maximum test strengths were nearly five times greater than the 1983 ACI Building Code predicted strengths. The higher strengths were a result of smaller span-depth ratios, in-plane compressive forces caused by restraining action at the supports, and excellent anchorage provided for the shear reinforcement.


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