3AISC 360 -05, Specification for structural steel building [ S ]. Chicago American institute of steel construction inc. 2005.
4AISC S335 - 1989,Specification for structrual steel building allow- able stress design and plastic design [ S]. Chicago American insti- tute of steel construction inc. 1989.
4America Institute of Steel Construction. Load and Resistance Factor Design Specification for Structural Steel Buildings. Chicago, IL, USA : AISC, 2001.
5White D W, Hajjar J F. Effective Length Approaches. Task Committee on Effective Length, ASCE, 1997.