Investigation of design parameters effects performance of concrete filled steel composite rectangular members according to design codes

Rectangular Concrete Filled Steel Tube (RCFST) members are used widely around the world in various types of structures such as (building, bridges, and, towers etc.). RCFST members are classified according to AISC360-10 as compact, non-compact and slender based on the slenderness ratio (width-to-thickness b/t ratio) of the steel tube walls. In this thesis presents an investigation on a design which parameters affect the performance of RCFST members. There are several factors that affect the design of RCFST members. Other than the interaction between the steel and the concrete core, geometric and material properties like height of rectangular HSS member (H), width (B), thickness of the tube (t), yield strength of steel (f_y) and compressive strength of concrete (f_c^'). Since the goal of the parametric study is to evaluate the contribution of the concrete, steel and dimensions quantitatively, the relative area and strength proportions of concrete to steel constitute the main parameters. The axial compression, and, flexural strength calculation basis of the applied calculation formula specification according to American Institute of Steel Construction (AISC360-10) and Eurocode 4 (EC4-2004) codes for the design of which parameter effects performance of RCFST members. Keywords: Rectangular CFST members, Axial strength, Flexural strength, Design codes.