Experimental investigation on behaviour of circular Concrete Filled Double Skin Tubular short columns (CFDST) under axial compressive loads

Abstract

Several people moving towards major cities due to the modern urbanization and also having several opportunities have led to the expansion of cities, the expansion of cities along the horizontal direction is restricted, hence all cities were developed vertically with high rise structures. In order to support the heavy loads acting on the structure, the members tend to become bulkier and heavier inturn reducing the carpet area, Therefore innovative solutions to overcome these problems are studied all across the globe, CFDST columns being one of its kinds, the load taking ability of CFDST sections is dependent on the concrete strength, confinement strength given by the tubes Therefore the prime focus of this investigation will be in understanding the performance of short concrete filled double steel tubular columns (CFDST) under axial compression forces and determining the influence of exterior steel tubes on the behaviour of CFDST columns. The results indicate that there is a direct correlation between the wall thickness of the external tube and column compression capacity, where an increase in the exterior tube thickness yields a proportional increase in the column compression capacity by providing better confinement to the concrete.