Abstract
In light of their excellent mechanical properties and other advantages over conventional systems for repairing and rehabilitating structures, fibre-reinforced polymers (FRPs) are commonly used to enhance the shear strength of RC members. Because of the relatively recent application of the technique in civil engineering, however, it is addressed in very few recommendations or guides. While the design guides in place contain a single, well defined and generally accepted procedure for calculating bending moments, they collectively propose a wide variety of numerical models for shear, none of which is universally acknowledged. The present article focuses on the calculation of ultimate shear strength and describes an experimental study in that context conducted on reinforced concrete beams retrofitted with unidirectional carbon fibre reinforced polymer (CFRP) fabric.
Highlights
While the aeronautic, naval and automobile industries first began to use fibre-reinforced polymer or fibre-reinforced polymers (FRPs) composite materials commercially 50 years ago, their application in civil engineering and building is much more recent
The FRP used for shear strengthening consists of carbon fibres, whose high strength and stiffness justify their cost, and an epoxy adhesive
NSM FRP: in this system the material, usually carbon fibre reinforced polymer (CFRP), is fitted into a resin-filled groove made in the concrete cover
Summary
Naval and automobile industries first began to use fibre-reinforced polymer or FRP composite materials commercially 50 years ago, their application in civil engineering and building is much more recent. FRPs have proven to be an optimal solution in structural repair and strengthening, with many advantages over more traditional techniques. FRP strengthening of reinforced concrete structures is a consolidated technique. The earliest research on the subject was conducted in the nineteen nineties. Those studies culminated in a well defined and widely accepted procedure for calculating bending strength and column confinement. Shear strengthening has been studied, albeit less extensively, and its effectiveness in raising ultimate capacity has been proven. A number of theoretical models have been put forward for dimensioning shear strengthening in RC structures, but none has been generally accepted. Factoring in the effect of externally bonded FRP obviously adds to the complexity of such models
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