STRENGTHENING OF R.C DEEP BEAMS USING CFRP,GFRP

Abstract

ABSTRACT

A deep beam is a structural member whose behavior is dominated by shear deformations. In practice, engineers typically encounter deep beams when designing transfer girders, pile supported foundations, or bridge bents .The primary reasons to upgrade an existing structure include building code changes, accidents, design errors or building use changes. For the past twenty-five years, the most popular method for strengthening and repairing structures is to epoxy-bond steel plates to the critical areas of the structure. The main drawbacks to this method are the amount of weight the steel adds to the structure, and the fact that steel rusts when exposed to harsh environments; therefore, is not suitable for all applications. In addition, the plates weight requires the use of special tools and equipment to ensure proper installation . Only a few years ago, the construction market started to use FRP for structural reinforcement, generally in combination with other construction materials such as wood, steel and concrete. FRP exhibit several attractive properties, such as low weight to strength ratio, non-corrosiveness high fatigue strength, and case of application. The main drawback to this method is high cost.