COMPARATIVE STUDY OF CONCRETE FILLED STEEL TUBES AND R.C.C COLUMN UNDER AXIAL COMPRESSION

The experimental study have been conducted to study the behaviour of self- compacting Concrete Filled Steel Tube CFST stub columns strengthened by Glass Faber Reinforced Polymer GFRP and CFST Columns strengthened by GFRP laminates A total of 42 stub columns under monotonic compression load were tested in order to discover the best configuration of the GFRP for confined column system, Fourteen specimens with circular cross-sections 50 mm Diameter and another Fourteen specimens with square cross-sections 70X70 mm. Fourteen specimens with Rectangular cross-sections 95X95X50 mm and having thickness of each specimen is 3 mm. The experimental results indicated that the use of GFRP laminates to strengthen the GFST has a significant effect on the overall behaviour of GFST such as enhancement on its strength. Also, the GFRP confinement delays local buckling of steel tube, prevents a sudden strength reduction caused by the local buckling of the steel tube. and increases lateral confinement of the concrete core. It is found that the best configuration of GFRP tubes system is transverse CFRP tube for circular hollow steel tube columns. Finally, from experimental investigation we have conducted that by using GFRP laminates strength has been increase consider ability for CFST columns and R.C.C columns.