Original Articles: 2017 Vol: 9 Issue: 4
Comparative Study on Axial Load Behaviour of CFST Columns with Different Stiffeners
Concrete-filled steel box column is widely used as a major structural element in tall buildings as it provides efficient structural performance in resisting axial compression. The concrete core adds stiffness and compressive strength to the tubular column. The steel tube acts as longitudinal and lateral reinforcement for the concrete core helping it to resist tension, bending moment and shear and providing confinement for the concrete But when the slenderness ratio of the plate is large, box columns fails under local buckling. From the past researches, it is also found that the thin walled sections are less stiffened. To overcome these defects, different types of stiffeners should be used inside the tube section. Thus, there is a need to investigate of the structural behavior of concrete filled thin walled steel tube column with different type of stiffeners, to increase stiffness and to reduce the local buckling failures. In this research, the effects of five different types of stiffeners were investigated experimentally and the results were compared with the column without stiffeners. Stiffeners were attached to the columns by using weld connections. From the results, it was observed that the stiffener enhances both the axial load carrying capacity and stiffness of the concrete filled thin walled steel tube columns.