Seyed Rasoul Mirghaderi - Assistant professor of School of Civil Engineering, College of Engineering, University of Tehran
Babak Keykhosro Kiani - Graduate Student of School of Civil Engineering, College of Engineering, University of Tehran

In this study, the local buckling behavior of stub columns with flanged cruciform section (FCSs), being considered as an appropriate alternative to use in orthogonal moment-resisting frames due to their symmetrical shape around principal axes as well as ease of fabrication is investigated. A simplified residual stress distribution model for welded FCSs is proposed and implemented in the experimentally verified, nonlinear finite element models and a wide range of web and flange thicknesses are assigned to evaluate the current AISC slenderness limits, employed for I-shaped sections in members subjected to pure compression. The results indicate that although I-shaped section slender/non-slender limits are safely applicable for FCSs members, the non-slender limit for web of FCSs members in pure compression can be safely increased by 15 percent.

Flanged cruciform, Column, Local buckling, Residual stresses, Finite element analysis