Abstract
The Concrete Filled Steel Tubular (CFST) columns have several benefits in comparison to the ordinary steel or reinforced concrete ones. Therefore, they have become more commonly acknowledged in the structural applications. In this study, two design codes such as American Concrete Institute (ACI) and Eurocode 4 (EC4) were used for predicting the ultimate axial strength of CFST columns filled with self-compacting concrete (SCC). To evaluate the results, circular steel tube with different diameter to thickness (D/t) ratio of 30, 60, and 90 and steel yielding strength of 185, 275, and 450 MPa were considered as prediction parameters. The wall thickness and length to diameter (L/D) ratio of the steel tubes were kept constant. As an infill material for the steel tubes, 16 different SCC mixtures reported in the literature were studied and their compressive strength results were used to get the code predicted ultimate axial strength of the composite columns. The analysis of the results based on ACI and EC4 were performed and discussed comparatively.
Highlights
Composite columns that have been widely used in the engineering applications have superior strength and ductility properties
Steel in Concrete Filled Steel Tubular (CFST) columns is used to confine the concrete that is the structural advantage of CFST and provides contribution in load carrying capacity
It should be noted that the cubic compressive strength results were converted to cylindrical compressive strength by using Eurocode 2 [22] and used in the calculation of ultimate strength of the steel tubular columns regarding to American Concrete Institute (ACI) 318 and EC 4 [18,19]
Summary
Composite columns that have been widely used in the engineering applications have superior strength and ductility properties. Steel Tubular (CFST) columns, significant differences with respect to ductility and energy absorption capacity can be observed. Due to their outstanding static and dynamic characteristics, CFST columns have been commonly utilized in the various types of structures such as bridges, high-rise buildings, subway platforms, etc. The load carrying capacity of the column is significantly influenced by the properties of steel and concrete. Increase in the load carrying capacity, stiffness, and ductility and decrease in the cost and time of construction by use of CFST columns make utilization of such columns attractive [7]. Since the experimental investigation of axial load carrying capacity of CFST columns extensively attracts the interests of researchers, the theoretical analysis, plays a significant role in engineering research and practice. A comparison of the analysis results based on both design codes was performed for the composite columns under the action of compressive loading
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