Parameter priority of stub and slender rectangular CFDST columns subjected to eccentric loading

Abstract This paper evaluates the behavior and ultimate load that previously identified parameters have on stub and long slender rectangular concrete‐filled double skin tubular (CFDST) columns subjected to eccentric loading. The investigation was performed using FE models that were calibrated and validated to eccentrically loaded experimental responses. A parametric investigation was thereafter conducted on seven parameters to establish the parameter priority on stub and long slender rectangular CFDST columns subjected to eccentric loading. The strong and weak axis minimally affects the parameter priority for a particular slenderness ratio. The investigation revealed that the parameter priority is different for stub and long slender columns. For load eccentricity, lateral curvature, steel strength, outer tube thickness, concrete strength, fixity, and inner tube thickness affect the ultimate load by 60.2%, 14.0%, 8.1%, 8.0%, 4.3%, 3.4%, and 2.1%, respectively, when compared to all parameters. For long slender columns, the load eccentricity, fixity, outer tube thickness steel strength, lateral curvature, concrete strength, and inner tube thickness affect the ultimate load by 70.7%, 10.6%, 6.2% 5.9%, 2.4%, 2.3%, and 2.0%, respectively, when compared to all parameters.