Modeling and verification of response of RC columns strengthened in flexure with mechanically fastened FRP

Abstract

One of the most important challenges exists in using of carbon fiber reinforced polymer(FRP) for strengthening of concrete members is the brittle behavior of RC members due to premature de-bonding of the layers. Mechanically fastened FRP (MF-FRP) systems are emerging as a promising method to prevent de-bonding of FRP strips and the prior brittle failure of strengthened RC members. The approach entails the use of fiber-reinforced polymer connected to the concrete substrate by means of steel anchors. In this research, a new anchor designed to delay de-bonding of FRP in reinforced concrete (RC) strengthened columns. Two reinforced concrete columns strengthened using the externally bonded conventional method and the new proposed method in comparison with unstrengthened RC column in the Laboratory. Specimens subjected to constant axial loading and cyclic lateral loading. Besides, numerical simulations performed using finite element models for nonlinear analyses of RC specimens: un-strengthened column; the column strengthened conventionally EB method and the column using new MF method.

Study on Retrofitting of RC Column Using Ferrocement Full and Strip Wrapping

“…Many retrofitting techniques are available and widely used like jacketing of the elements, and the most popular technique of jacketing is fiber-reinforced polymer jacketing that is of high in cost when applied [2]. Each technique has its own advantages and disadvantages such that one of the challenges in strengthening by FBR is the brittle behavior that leads to the early de-bonding between the FBR and the reinforced concrete columns, thus the FBR is fastened mechanically with the RC column by steel anchors that will increase their bonding and reduce the action of early debonding that increased the ultimate load lateral load of the strengthened column by 37% [3]. The researchers investigated an alternative local technique for retrofitting such as ferrocement.…”