Localization Issues in Force-Based Frame Elements
Publication: Journal of Structural Engineering
Volume 127, Issue 11
Abstract
This paper summarizes the results of an investigation on objective modeling and prediction of deformation localization in nonlinear force-based frame elements. Emphasis is placed on the behavior of reinforced concrete structures where localization is most likely to occur. The discussion begins with a brief review of the force-based element formulation. Next, plastic hinge behavior is classified into three categories: hardening plastic hinges, perfectly plastic hinges, and softening plastic hinges. The three types of inelastic behavior pose an increasing challenge to objective postpeak modeling. The physical and numerical characteristics of localized failure are outlined. Two regularization techniques for maintaining postpeak objectivity are proposed: (1) a constant fracture energy criterion, which provides objective response on the element force-displacement level; and (2) geometric scaling, which provides objective response on the local moment-curvature level in plastic hinge regions. The discussion concludes with three applications to different reinforced concrete structures: a frame, a bridge pier, and an overreinforced concrete beam. In all three cases, the proposed regularization technique successfully yields objective model predictions.
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Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 127 • Issue 11 • November 2001
Pages: 1257 - 1265
History
Received: May 31, 2000
Published online: Nov 1, 2001
Published in print: Nov 2001
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