Review of Key Parameters Affecting Punching Shear Strength of Post-Tensioned Slabs
Madhura Sanjay Chavan and Mary Beth Hueste
Appears on pages(s):
Direct shear, experimental database, flat slabs, post-tensioned concrete, punching shear, reinforcement ratio, slab-column connections
Experimental tests have been performed on interior post-tensioned (PT) slab-column (SC) connections over the past several decades. This paper presents a comprehensive database of 92 such tests performed on interior PT SC connections without shear reinforcement under direct shear. The data was then analyzed to compare the accuracy of the punching shear provisions of ACI 318-19, Eurocode 2 (2004), and CSA A23-19. Several key parameters were evaluated for the PT SC specimens including the concrete compressive strength, specimen geometry, bonded flexural reinforcement ratio, and minimum area of bonded flexural reinforcement; and their influence on the two-way shear strength of these connections was studied. Recommendations are made for possible modifications to the provisions of ACI 318-19 including the limit on the value of the concrete compressive strength f_c^'. Areas for further study, including size effect and bonded flexural reinforcement requirements, are highlighted.