Thermodynamic-Based Elastoplasticity Multiaxial Constitutive Model for Concrete at Elevated Temperatures
Publication: Journal of Engineering Mechanics
Volume 143, Issue 7
Abstract
In the current study, a multiaxial plastic-damage constitutive model for concrete at different temperatures is developed. The model is implemented in three-dimensional finite element analysis under fire conditions. Because of the complexity of the mechanical behavior of concrete at elevated temperatures, the establishment of an applicable concrete constitutive model remains challenging. The developed model combines damage mechanics and elastoplasticity theories based upon a thermodynamic theoretical framework. A fourth-order tensor is adopted to describe the unilateral effect. Pressure-dependent damage evolution is considered to characterize the behavior of concrete at highly confined stress states. Transient creep and thermal strains are included to account for the thermal response. Numerical simulations are conducted to validate the developed model; the predictions show good accuracy compared with the experimental results.
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Acknowledgments
This work was supported by the National Natural Science Foundation of China (No. 11572249).
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Published In
Journal of Engineering Mechanics
Volume 143 • Issue 7 • July 2017
Copyright
©2017 American Society of Civil Engineers.
History
Received: Jun 7, 2016
Accepted: Dec 13, 2016
Published online: Feb 27, 2017
Published in print: Jul 1, 2017
Discussion open until: Jul 27, 2017
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