Inverse Analysis Tailored for UHPFRC
Publication: Journal of Engineering Mechanics
Volume 143, Issue 9
Abstract
Nonlinear behavior of concrete reinforced by rebars and/or fibers has been studied over decades. In this paper, classical models for flexural behavior are discussed and an improved model is proposed. The model is based on a modified force-based fiber-beam formulation where progressive loading is driven by a curvature at its nonlinear hinge. Such a procedure allows capturing both softening and hardening behavior without any further adjustments. The curvature outside of the nonlinear hinge decreases during a deflection-softening phase, and therefore a damaged constitutive law should be introduced. Rather than using the classical damage model proposed by Mazars, a macroscopic damage model at the moment-curvature level is proposed. The moment-curvature damage model reduces the whole computation of the beam equilibrium to only one numerical loop. Consequently, time efficiency of the proposed model is significantly improved. Hypotheses of the new model such as damage modeling, localization, and shear deflection are discussed and finally practical applications are presented to show the model benefits.
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Acknowledgments
The support of the Grant Agency of the Czech Republic—Grant Project No. 16-04454S “Uncertainties on the material level affecting those on the structural level” is gratefully acknowledged by the author.
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Published In
Journal of Engineering Mechanics
Volume 143 • Issue 9 • September 2017
Copyright
©2017 American Society of Civil Engineers.
History
Received: May 10, 2016
Accepted: Apr 13, 2017
Published online: Jun 30, 2017
Published in print: Sep 1, 2017
Discussion open until: Nov 30, 2017
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