Advanced Steel Construction

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

DOI:10.18057/IJASC.2011.7.3.5

 

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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