Investigation of design parameters effects performance of concrete filled steel composite circular beams according design to codes

The Concrete Filled Steel Tubular (CFST) members offer many structural features and have been widely used in civil engineering structures. Available in many different shapes, but most important circular, rectangular and square, etc. The CFST structures offers numerous structural benefits, including high strength, favorable ductility, and highly absorbable to withstand external shocks. They have proven to be economically as well as providing for the rapid construction and thus additional cost savings. The circular CFST members included normal strength concrete filled circular structural sections. In this study the parameters; diameter (D), thickness (t), yield stress 〖(f〗_y), and compressive strength of concrete 〖(f〗_c^') show their effect on the members and their comparison, according to calculation equations of the American (AISC 360-10) and European (Eurocode 4-2004) codes for the design of which parameter effects performance of CCFST members under axial compression and flexure. Keywords: Circular CFST members, Axial strength, Flexural strength, Design codes.