Nonlinear Elastoplastic Analysis of Semirigid Steel Frames at Elevated Temperature: MP Approach
Publication: Journal of Structural Engineering
Volume 129, Issue 5
Abstract
An elastoplastic analysis of semirigid steel frames subjected to elevated temperature is presented. Within the discretized structural framework, an updated Lagrangian approach is used to incorporate the nonlinear geometric effects on the equilibrium and constitutive conditions. Modeling of elastoplastic behavior is based on the generalized plastic hinge concept for beam-column elements that obey piecewise linearized yield criteria. Under the proportional temperature variation, the analysis for finite temperature increment becomes the standard form of a nonlinear complementarity problem in mathematical programming (MP) formalism. An iterative predictor–corrector scheme coupled with an MP-based method is used in the analytical procedures. Numerical studies are carried out on rigid and semirigid frames. It is found that the benefits of using a full-strength rigid connection over the semirigid one are not unlimited, particularly on the frames with fire-unprotected columns.
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Published In
Journal of Structural Engineering
Volume 129 • Issue 5 • May 2003
Pages: 661 - 671
Copyright
Copyright © 2003 American Society of Civil Engineers.
History
Received: Dec 6, 2001
Accepted: Jul 29, 2002
Published online: Apr 15, 2003
Published in print: May 2003
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