Advanced Steel Construction

Vol. 9, No. 4, pp. 259-281 (2013)



Nam-Il Kim 1 and Dong-Ho Choi 2*

1 Department of Architectural Engineering, Sejong University, 98 Kunja Dong, Kwangjin Ku, Seoul 143-747, S. Korea

2 Department of Civil and Environmental Engineering, Hanyang University, 17 Haengdang-dong, Seoungdong-gu, Seoul, 133-791, South Korea

*(Corresponding author: E-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.)


Received: 5 November 2011; Revised: 1 June 2012; Accepted: 8 June 2012




In this study, the inelastic system buckling analysis is developed to evaluate the buckling loads andthe effective length factors for columns in steel frames subjected to nonconservative forces. For this purpose, the finite element model for the nonconservative system is presented based on an extended Hamilton principle. Thetraditional elastic and inelastic stability analyses are briefly introduced for the conservative systems. Then evaluation procedure for the critical value of buckling load and its corresponding effective length factor for the nonconservative system are proposed based on the inelastic system buckling approach. In numerical examples, the buckling loads and the effective length factors for the inelastic conservative or nonconservative steel frames are evaluated and compared with results by other  researchers.  Particularly,  the  effects  of  various  parameters  such  as  the  nonconservativeness  parameter,  the stiffness and span ratios of beam to column of frames on the inelastic stability behavior of nonconservative systems are newly addressed.


Keywords:Effective length factor, Inelastic column, Nonconservative force, Finite element method


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