1. Load and resistance factor design specification for structural steel buildings,1999
2. User’s manual, version 5.4,1998
3. Structural stability: theory and implementation;Chen,1987
4. Investigation on Vierendeel mechanism in steel beams with circular web openings;Chung;J Construct Steel Res,2001
5. Non-linear finite element analysis of solids and structures;Crisfield,1995