Punching Shear Behaviour Of Restrained Two Way Slabs With Gfrp As Replacement To Steel Bars

Abstract

An experimental investigation was carried out on two-way slab elements, and elements are reinforced with hybrid
reinforcements of Steel and Glass Fiber Reinforced Polymer (GFRP) bars. The GFRP reinforcement is provided in the
slab as a replacement for steel in the proportions of 0, 28.57, 57.14, 85.71, and 100%. A total of fifteen slabs are cast
for five replacements, and the slabs are tested under punching shear to evaluate failure loads, stiffness, energy
absorption, and load-deflection characteristics. The slabs with hybrid reinforcements showed superior performance
compared with slab 100%GFRP reinforcement. IS 456 and ACI 318 guidelines are considered to assess failure loads,
and those were underestimated the results. To predict the failure loads regression model is proposed in this article,
and its performance provided satisfactory results.