Nonlinear Creep Damage Model for Concrete under Uniaxial Compression
Publication: Journal of Engineering Mechanics
Volume 129, Issue 9
Abstract
An isotropic model for creep damage of concrete under uniaxial compression is proposed, where the combined effect of nonlinear viscous strain evolution and crack nucleation and propagation at high stress levels is considered. Strain splitting assumption is used for creep and damage contributions. Creep is modeled by a modified version of solidification theory. As usual in the modeling of damage of concrete, a damage index based on positive strains is introduced. As particular cases, the proposed model reduces to linear viscoelasticity for long time low stress levels whereas, for very high stresses, tertiary creep causing failure at a finite time can be described. The effect of strength variation with time is also included. The model is numerically implemented to perform time integration of nonlinear equations by means of a modified version of exponential algorithm. The model is validated through comparison with experimental results. Some numerical examples are also presented, where the roles of concrete ageing and strength variation with time are investigated.
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Published In
Journal of Engineering Mechanics
Volume 129 • Issue 9 • September 2003
Pages: 1065 - 1075
Copyright
Copyright © 2003 American Society of Civil Engineers.
History
Received: Nov 21, 2001
Accepted: Nov 12, 2002
Published online: Aug 15, 2003
Published in print: Sep 2003
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