Inelastic material models that were previously developed by the author for standard W-Shapes were adapted for use to model the behavior and strength of rotary-straightened hot rolled sections and welded high-strength steel (HSS) sections. Using published residual stress models for these Ⅰ-shape sections, limit load analyses were conducted using the material models in MASTAN2 and were compared with published experimental and finite element results. The rotary-straightened hot rolled sections were modeled as simply supported columns and beam-columns, and the material model required an adjustment to the initial yield moment conditions m_1 and the use of two residual stress ratios c_r~+ and c_r~-. The welded HSS sections were modeled as beams with a constant moment, and the material model required only a slight increase in the exponent conditions n_z and n_y. Comparisons with published results indicate that these minor modifications were sufficient to provide very good modeling agreement. The previously developed material models can be used effectively to model the limit load conditions of rotary-straightened hot rolled beam-columns and welded HSS Ⅰ-section beams.
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