Compression Field Modeling of Confined Concrete: Constitutive Models
Publication: Journal of Materials in Civil Engineering
Volume 18, Issue 4
Abstract
It has been widely recognized that the behavior of confined concrete depends upon the level of confinement. Brittleness or ductility is a function of the state of compressive stresses, unconfined concrete strength, volumetric expansion, and concrete softening. Constitutive models for strength enhancement, concrete dilatation, and a new stress-strain relationship for concrete in triaxial compression are proposed. The load-carrying capacity of confined concrete is predicted by utilizing an Ottosen-type surface with newly developed coefficients that account for a wide range of confinement levels (lateral pressures up to 100% of the unconfined concrete strength) and unconfined concrete strengths from 20 to . Concrete dilatation is modeled as a function of the lateral pressure ratio and concrete strength and can reach values beyond the limit of uncompressibility. Experimental results are used to corroborate the new models at the material level, producing accurate agreement.
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Acknowledgments
The first writer is grateful for the financial assistance provided by the National Science and Engineering Research Council of Canada (NSERC) and the University of Toronto and the Government of Ontario, Canada, through an OGSST scholarship.
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Information & Authors
Information
Published In
Journal of Materials in Civil Engineering
Volume 18 • Issue 4 • August 2006
Pages: 510 - 517
Copyright
© 2006 ASCE.
History
Received: Dec 20, 2004
Accepted: May 20, 2005
Published online: Aug 1, 2006
Published in print: Aug 2006
Notes
Note. Associate Editor: Kiang-Hwee Tan
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