Stress–Strain Modeling of Concrete Columns with Localized Failure: An Analytical Study
Publication: Journal of Composites for Construction
Volume 20, Issue 3
Abstract
Axially-loaded concrete columns with postpeak strain-softening suffer large inelastic deformation only in a localized failure zone, leading to nonuniform deformation along the height of the columns. Therefore, calculation of axial deformation of such a column is more complicated and involves the concept of compressive fracture energy. No model of compressive fracture energy and the relevant stress–strain relationship has been developed in the literature for fiber-reinforced polymer (FRP) confined concrete columns. Different definitions of the fracture energy have been adopted in extant literature, which has caused inconsistency and difficulty in application of the models. This analytical study involves the development of a more rational and general framework for stress–strain modeling of axially-loaded concrete columns involving failure localization. Modeling of the postpeak inelastic deformation and its associated compressive fracture energy is studied and its parameters are scrutinized and evaluated. A unified relationship is formed to relate different definitions of the fracture energy so that they can be compared with each other. The new stress–strain model shows good agreement with experimental results, and can be used for design of axially-loaded FRP-confined concrete columns.
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Acknowledgments
The work described in this paper was fully supported by a grant from CityU (Project No. 7004179) and the National Natural Science Foundation of China (Grant No. 51378449).
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Published In
Journal of Composites for Construction
Volume 20 • Issue 3 • June 2016
Copyright
© 2015 American Society of Civil Engineers.
History
Received: Jun 15, 2015
Accepted: Aug 25, 2015
Published online: Oct 26, 2015
Discussion open until: Mar 26, 2016
Published in print: Jun 1, 2016
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