Nonlinear Finite Element Analysis for Cyclic Behavior of Thin-Walled Stiffened Rectangular Steel Columns with In-Filled Concrete

摘要: AbstractThe strength, ductility, and energy dissipation capacity of thin-walled, stiffened rectangular concrete-filled steel columns (thin-walled RCFT columns) subjected to cyclic loads are significantly upgraded by filling with concrete the internal hollow space tube longitudinal stiffeners diaphragms. However, because accumulation plastic strains high tensile stress concentration in thin-walled columns, metal fracture sometimes occurs before develop their strength ductility. To elucidate behavior CFT prevent premature failure resulting from fracture, it is necessary some geometrically materially nonlinear finite element (FE) models that can accurately take into account important factors such as local buckling, strain concentrations tube, confinement in-filled concrete, interface action between concrete. In this...