ABSTRACT
This chapter describes the nonlinear inelastic analysis of circular and rectangular concrete-filled stainless steel tubular (CFSST) short columns under axial compression or combined axial compression and bending. It presents the numerical modeling technique. The accuracy of numerical models for the nonlinear inelastic analysis of CFSST columns relies on the implementation of accurate material stress–strain relationships for stainless steel and concrete. The chapter suggests that the fiber-based modeling technique. The nonlinear analysis technique is based on the fiber element method. Several stress–strain constitutive models for carbon steels and stainless steels proposed by researchers are given in detail. In the nonlinear analysis of a CFSST short column under axial load and bending, the residual force and moment generated at each iteration are nonlinear dynamic functions which are not derivable. Computational algorithms implementing the secant method are employed to solve the nonlinear dynamic equilibrium equations of CFSST beam-columns subjected to eccentric loading.
