Title: Strengthening Concrete Slabs for Punching Shear with Carbon Fiber-Reinforced Polymer Laminates

Author(s): Kyriakos Sissakis and Shamim A. Sheikh

Publication: Structural Journal

Volume: 104

Issue: 1

Appears on pages(s): 49-59

Keywords: flat plate; punching shear; shear reinforcement; slab

DOI: 10.14359/18432

Date: 1/1/2007

Abstract:
This paper describes an innovative approach for strengthening reinforced concrete slabs in shear with carbon fiber-reinforced polymer (CFRP) laminates. A process analogous to stitching is used to retrofit concrete slabs with fiber-reinforced polymer (FRP) strands. The experimental study reported herein was carried out on 28 square, isotropic two-way slab specimens simulating conditions in the vicinity of an interior square column in a continuous flat plate structure. Parameters such as the concrete strength, flexural capacity, and shear reinforcement arrangement were investigated, and the applicability of existing CSA A23.3-04 and ACI 318-05 standard specifications for punching shear resistance were examined. Results from the tests show that marked increases in the punching shear capacity and ductility (over 80 and 700%, respectively) can be achieved with CFRP retrofitting of slabs.