Inelastic Behavior of Multistory Partially Restrained Steel Frames. Part I
Publication: Journal of Structural Engineering
Volume 125, Issue 8
Abstract
This paper outlines the development of a finite element for use in the inelastic second-order analysis of partially (PR) and fully (FR) restrained planar steel frames. The finite element considers spread of plastification within the cross section and along the member length; centroidal shift of the elastic core; a variety of residual stress distributions; and P-Δ effects. Nonlinear spring elements are used in modeling beam-end connections. An arc-length technique (with iteration) is used in the analysis of individual beam-columns, while constant-work simple Euler stepping (no iteration) is used in the nonlinear analysis of frameworks. Full nonlinear load-deformation response of planar beam-columns and frames is computed. Accuracy is demonstrated through comparison with previously published analytical results. It is shown that concentrated plasticity models may lead to an overestimation of connection rotation in PR frameworks. A companion paper discusses the inelastic ultimate load analysis of large steel PR frameworks and evaluation of connection classification systems.
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Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 125 • Issue 8 • August 1999
Pages: 854 - 861
History
Received: Feb 18, 1997
Published online: Aug 1, 1999
Published in print: Aug 1999
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