Fiber-Based Nonlocal Formulation for Simulating Softening in Reinforced Concrete Beam-Columns
Publication: Journal of Structural Engineering
Volume 144, Issue 12
Abstract
A nonlocal formulation framework is presented to address mesh-dependent strain localization in displacement-based frame element models in the presence of constitutive softening. The framework consists of a nonlocal displacement-based frame element and a nonlocal fiber-based plasticity model, and is used to simulate the postpeak response of RC structural members. The algorithmic implementation of the framework is discussed, and its performance is thoroughly investigated. Mesh sensitivity studies reveal that the proposed approach eliminates mesh-dependent strain localization and leads to objective global (i.e., load displacement) and local (i.e., curvature profile) response in the presence of concrete softening. Comparison with historical test data from 24 column specimens shows that the postpeak response of RC beam-columns is predicted with reasonable accuracy. The limitations of the presented framework are discussed along with areas for further development.
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Acknowledgments
This work was supported by the National Science Foundation (Grant No. CMMI 1434300) and graduate assistantships from the University of California at Davis. The findings and opinions presented in this paper are entirely those of the authors.
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Published In
Journal of Structural Engineering
Volume 144 • Issue 12 • December 2018
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©2018 American Society of Civil Engineers.
History
Received: Nov 15, 2017
Accepted: Jun 5, 2018
Published online: Sep 26, 2018
Published in print: Dec 1, 2018
Discussion open until: Feb 26, 2019
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