Predicting the Earthquake-Induced Permanent Deformation of Concrete Face Rockfill Dams Using the Strain-Potential Concept in the Finite-Element Method
Publication: International Journal of Geomechanics
Volume 17, Issue 11
Abstract
Presented in this paper is a modified strain-potential method for the prediction of earthquake-induced permanent deformation of concrete face rockfill dams (CFRDs). The concept of decomposing the total strain of rockfill materials into a viscoelastic part and a plastic part during dynamic loading was explained based on experimental observations. Use of the strain-decomposition concept in the finite-element method resulted in two residual strain–related terms on the right-hand side of the dynamic equilibrium equation. An approach to predict the equivalent number of loading cycles, which is an independent variable in a residual strain model, was proposed. It was assumed that the energy dissipated in an element during an irregular strain history equals that dissipated in an equivalent regular one. The energy-based approach was proved effective in numerically evaluating the equivalent number of loading cycles by simple column tests considering both compression and shearing. The modified strain-potential method can be easily implemented in an equivalent linear analysis program, and the history of permanent deformation accumulation can be directly obtained without recourse to sophisticated constitutive models. Effectiveness of the method was demonstrated by a successful application in a high CFRD.
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Acknowledgments
This work was supported by the National Natural Science Foundation of China (NSFC, Grants 51539006 and 51379130). The financial support from the Chinese Ministry of Water Resource (CMWR, Grant 201501035) is also greatly appreciated.
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International Journal of Geomechanics
Volume 17 • Issue 11 • November 2017
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© 2017 American Society of Civil Engineers.
History
Received: Apr 11, 2016
Accepted: Jun 2, 2017
Published online: Aug 31, 2017
Published in print: Nov 1, 2017
Discussion open until: Jan 31, 2018
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