Behavior of Cold-Formed Steel Built-Up Sections with Intermediate Stiffeners under Bending. II: Parametric Study and Design

AbstractBuilt-up sections were used in a wide range of constructional steel applications. The investigation aims to develop suitable design rules for cold-formed steel doubly symmetric built-up open and closed sections with intermediate stiffeners under bending in this study. These built-up sections have a sufficient number of connections either at the flanges or webs, depending on the sectional configurations. Followed with the experimental investigation and finite-element validation in the first part of this study, a numerical parametric study including a total of 113 different built-up section beams was conducted. The key parameters including the sectional shapes and slenderness as well as the different failure modes and structural behavior were examined. The experimental data, together with the numerical results were compared with the predicted strengths using the current direct strength method (DSM) in the North American Specification. The determination of elastic buckling stresses corresponding to d...

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