Vol. 7, No. 3, pp. 274-301 (2011)
SEMI-RIGID ELASTO-PLASTIC POST BUCKLING ANALYSIS
OF A SPACE FRAME WITH FINITE ROTATION
K.S. Lee 1 and S.E. Han 2,*
1 Research Assistant Professor, Department of Architectural Engineering,
Inha University, 253 Yonghyundong, Nam-gu, Incheon, 402-751, South Korea
2 Professor, Department of Architectural Engineering,
Inha University, 253 Yonghyundong, Nam-gu, Incheon, 402-751, South Korea
*(Corresponding author: E-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.)
Received: 4 December 2010; Revised: 17 January 2011; Accepted: 24 January 2011
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ABSTRACT
In this study, large-deformation and small-strain elasto-plastic analysis of space frames with symmetric cross sections and semi-rigid connections are presented. The effect of axial forces on the bending moment and lateral buckling are included. However, axial-torsional and warping effects are omitted. The Eulerian equations for a beam-column with finite rotation taking into account bowing effects are adopted for an elastic system and are extended to an inelastic system with a plastic hinge concept. The derived tangent stiffness matrix is asymmetric due to the finite rotation. The joint connection elements were introduced for semi-rigidity using a static condensation technique. The arc-length method was applied to trace the post-buckling range of elastic and elasto-plastic problems with semi-rigid connections. Nonlinear buckling and elasto-plastic collapse analyses were carried out for the proposed space frame to demonstrate the potential of the developed method in terms of accuracy and efficiency.
KEYWORDS
Space frame, Large deformation, Beam-column, Plastic hinge, Semi-rigid
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