Axial Behavior of Concrete Filled Steel Tubular Column With External FRP Confinement

Abstract

A column is a vertical member which excellently takes load by newlinecompression. Basically, column is a compression member as load acts newlinealong its longitudinal axis. Bending moment may occur due to eccentric newlineloading, wind, earthquake or accidental loads. Column transfers the load newlineof the structure of slabs, beams above to below lying foundation and newlinefinally load is transferred to the soil. Position of the columns should be newlineso that there are no tensile stresses developed at the cross section of the newlinecolumns. Composite columns have an important application in the newlinecomposite construction and they are widely used in high rise buildings newlineand bridge piers. A popular trend in composite columns is to fill steel newlinetubes with concrete core, since the steel and concrete combined together newlineto contribute to increasing the strength of the section. newlineIn recent years, FRP jacketing has become famous to retrofit of newlinealready existing damaged structures. The lightweight, extreme strength newlineand corrosion resistance of fiber reinforced polymers create them newlineespecially more suitable for repair and strengthening. Numbers of newlineexperimental studies have demonstrated that FRP confinement could newlinesignificantly increase energy absorption and ductility of structures. newlineA large number of studies has been recently carried out on the characteristics of externally applied FRP and highlighting the use of newlineexternally applied FRP for retrofitting of structural elements. newlineIn this study, the compressive behaviors of Concrete Filled newlineSteel-Tubes (CFT) confined with Fibre Reinforced Polymers (FRPs) newlinewere investigated. CFT columns of varying height (0.9m, 1.2m, 1.5m newlineand 1.8m), different types of FRPs (Glass, Basalt, Carbon) and number newlineof plies (single and double plies) are chosen as varying parameter to newlinestudy the behaviour of CFT columns. newlineFirst the materials to be used in the project are analysed for their newlineproperties. The characteristic compressive strength of concrete taken in newlinethis study was 25 MPa. newlineFeasibility study is a preliminary study undertaken to determine, newlineanalyse and select