The use of steel reinforcement in concrete construction has proven to be very effective due to the excellent properties that the reinforcing steel has that compliment the concrete properties, for example increase in tensile strength and ductility. However, one of the drawbacks of steel is its long-term behaviour especially in areas where the humidity is high. In such areas, the steel usually suffers from rust and oxidation which eventually lead to the deterioration of the concrete structure. One method to reduce this effect is to protect the reinforcing bars, for example wrapping or using cathodic protection. This paper investigates the behaviour of reinforced concrete columns reinforced with FRP both in the vertical and horizontal directions.
As most columns are subject to a combination of axial forces and bending moments, the experimental programme presented in this paper is for columns that are eccentrically loaded. A total of twelve specimens were cast and tested.
This paper experimentally investigates the performance of high strength concrete (HSC) columns confined with vertically and horizontally oriented carbon fibre reinforced polymer (FRP) wrapping, tested under eccentric loads. Previous studies have proven that HSC columns confined by FRPs have had positive effects under concentric and eccentric loading, however little is known about vertically oriented FRPs. The effectiveness of wrapping concrete elements, for example beams and columns have been proven by several researchers. Several studies have reported on testing reinforced concrete columns wrapped with different types of FRP. With the exception of few studies, (for example [1-5]) most of the studies are based on testing columns under concentric loads. It is clear that there is a need to investigate the behaviour of columns under eccentric loads as most of the columns in buildings, especially at the edge and corner of buildings are subject to eccentric uniaxial or biaxial loading. The aim of this paper is to investigate the behaviour of concrete columns reinforced with vertical FRP straps and wrapped with FRP under the application of an eccentric axial load.