Nonlinear analysis of steel plane frames with initial imperfections

Tai-Yan Kam*, F. S. Lee

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

11 Scopus citations


A previously proposed member tangent stiffness matrix subjected to elastic-plastic bending and derived from moment-thrust-curvature equations is extended to include the effects induced by the initial crookedness of a member. The shape of the initial geometrical imperfection of the member may be arbitrary and is expressed as an initial curvature in the formulation. A tangent stiffness matrix for initially crooked wide-flange members of elastic-plastic material is constructed and utilized for analyzing inelastic frames with initial geometrical imperfections. For the inelastic frame analyses, an incremental loading procedure is utilized to trace the load-displacement curves for the frames, and the descending branch of the load-displacement curves are obtained by using the modified arc length method of Crisfield. The technique is illustrated by several examples of plane frames loaded beyond their limit points.

Original languageEnglish
Pages (from-to)553-557
Number of pages5
JournalComputers and Structures
Issue number4
StatePublished - 1 Jan 1986

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