The oretical evaluation of increasing holding capacity of concrete beams by using FRP reinforcement

Abstract

Throughout their lives, the ability of reinforced concrete structures cannot be seen as adequate as in terms of static and dynamic functions envisaged in the project, this is because of the depreciation of the structure or change of destination and purpose of its use. So there is need to strengthen these structures with diff erent materials, such as fi bre reinforced polymers (FRP), which have found extensive use in recent decades. Carbon fi bres are used in ordinary and prestressing reinforced concrete elements working in fl exion, where the role of carbon fi bres is to increase the holding capacity of bending moment and cutting forces, and to avoid larger cuts than those allowed. Carbon fi bres are used to strengthen reinforced concrete columns increasing their ability and to realize the “tightening” of concrete to withstand large forces trimmer. This article presented a study on the eff ect of the use of fi bre reinforced polymers (FRP), which increase the holding capacity of reinforced concrete beams with steel rebars. There are made comparisons of the changes in the ability of an only reinforced concrete beam with lower armour and armour double without external reinforcement, then the reinforcement layer and double-layer CFRP. There are taken some important conclusions, using the results above.