Experimental behaviour of Self Compacting Concrete Filled Steel Rectangular Fluted Columns for Concentric Load

Abstract

A well planned experimental work on thirteen regular concrete filled steel fluted columns (CFSFC). The parameters chosen for the study are Geometry of the specimen-Rectangular flutes. Different L/D ratios, Longitudinal reinforcement. Three series of specimens having different L/D ratios, 2500 mm long have been tested with M 20 grade of concrete. Study has been made with respect to the Self Compacting Concrete as per Nan Su method and tested for conformity as per IS Specifications is poured into the fluted steel tube. These columns were cured for 28 days by frequently pouring water over top of the column. Pilot specimens cured in a similar manner were tested to know the basic properties. It has been found from the observation that columns had good confinement and SCC the failure was at supports for all columns by opening up of steel sheet showing local buckling. It was also observed that as the L/D ratio increased the opening up of steel sheet moved towards the supports. None of the columns showed any buckling characteristics for enhanced loading or for higher L/D ratios of 25. Results obtained from the experiments have been compared with earlier developed empirical equations and have been found that generally, the theoretical values are conservative compared to the experimental values by about 50 to 60%.