Concrete-Filled Steel Tubes (CFST) are composite members consisting of a steel tube infilled with concrete. The behavior of the composite member will be better than the simple combination of two materials. In the construction of high rise buildings, CFST is one of such innovative new building material, which provides not only an increase in the load carrying capacity but also economy and rapid construction, and thus results in cost saving. Earlier works carried out on CFST have indicated that these sections possess high ductility, fire resistance, strength, resist bending moment, prevents local buckling of steel, spalling of concrete and stiffness properties. The tube acts as a formwork in construction hence decreases its labor and material costs. In earthquake prone areas multi-storied buildings are erected by considering the above properties. This paper portrayed the flexural behavior of CFST structural members with and without reinforcement. Keywords-Concrete filled steel tubes, finite element analysis, flexural behavior.