Viscoelastic Nonlinear Multilayered Model for Asphalt Pavements
Publication: Journal of Engineering Mechanics
Volume 142, Issue 7
Abstract
Flexible pavements are multilayer structures, typically with a viscoelastic asphalt layer followed by nonlinear unbound/bound layers. Conventionally, multilayered elastic analysis is performed to obtain the response of flexible pavements for design and inverse analyses; however, assuming asphalt pavement to be a linear elastic material is an oversimplification of its actual behavior. It is well known that the responses of asphalt pavements are both rate and temperature dependent. In the present work, a computationally efficient model has been developed to analyze flexible pavements, considering the top layer of linear viscoelastic asphalt concrete (AC), followed by a stress-dependent (nonlinear) base layer, and an elastic subgrade. Constitutive equations are formulated for layered viscoelastic–nonlinear axisymmetric systems. It is shown that the developed model can be used to simulate pavement response under stationary or transient loading. A comparison between the model responses and results obtained using a finite-element (FE) model shows that the model could be used to simulate both deflections and stress responses in multilayer viscoelastic nonlinear structures. The primary advantage of the model, as opposed to FE models, is its computational efficiency. This makes it viable for use in backcalculation algorithms.
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Acknowledgments
The funding for this study was provided by the Federal Highway Administration (FHWA) Grant DTFH61-11-C-00026. This support is greatly appreciated. The authors also express their gratitude to Dr. Nadarajah Sivanesvaran (Siva) from the FHWA for his valuable comments. The authors also acknowledge the comments of the FHWA project team members Prof. Karim Chatti, Dr. Imen Zabaar, and Prof. Nizar Lajnef.
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Published In
Journal of Engineering Mechanics
Volume 142 • Issue 7 • July 2016
Copyright
© 2016 American Society of Civil Engineers.
History
Received: Feb 14, 2014
Accepted: Jul 24, 2014
Published online: Mar 22, 2016
Published in print: Jul 1, 2016
Discussion open until: Aug 22, 2016
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