Plastic Hinge Development of Frame Members Using a Nonlinear Hardening Rule
Publication: Journal of Structural Engineering
Volume 131, Issue 8
Abstract
A nonlinear hardening rule that defines a yield surface translation for homogeneous frame member materials is proposed. The rule is defined as a nonlinear constitutive relationship that examines material behavior through a postelastic perspective. The gradual development of the postelastic states of a beam along its length and through its section thickness is analyzed. The model uses a hardening index parameter to guide the nonlinear stress–strain relationship, and a smooth function to model the web–flange intersection of frame members. As such, nonlinear curvature distributions with continuous derivatives are determined along the length of the member, which enables lateral displacements to be accurately predicted. Plastic hinge lengths and finite-element displacements are subsequently determined, and a nonlinear stiffness is derived. The model is formulated on a constitutive level and applies a smoothed-over cross section to derive a single internal moment expression for any postelastic state. Results are verified through experimental published literature.
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Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 131 • Issue 8 • August 2005
Pages: 1286 - 1293
Copyright
© 2005 ASCE.
History
Received: Nov 8, 2002
Accepted: Nov 19, 2004
Published online: Aug 1, 2005
Published in print: Aug 2005
Notes
Note. Associate Editor: Enrico Spacone
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