Static and Dynamic Axial Response of Drilled Piers. II: Numerical Simulation
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VIEW THE ORIGINAL ARTICLEPublication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 137, Issue 12
Abstract
Realistic time history simulation of drilled pier/pile-soil systems under dynamic and static loading is essential for the development of effective performance-based earthquake designs of deep foundations. This paper presents the results of the numerical simulation of a series of static and dynamic tests on drilled piers performed at the University of California, Berkeley. A nonlinear soil model was implemented based on multiaxial cyclic bounding-surface plasticity within a general finite-element framework, OpenSees. The model requires a small number of parameters that can be easily obtained through conventional site investigations. The results of the simulations show that the model can reasonably simulate nonlinear response of the soil and that it does a good job of capturing the actual load deformation curves obtained from in situ dynamic and static pier load tests. Although the model is suitable for a fully nonlinear total stress analysis of soil-pile systems under multidirectional shaking, further studies are needed to enhance the model capacity by incorporating the cyclic stiffness and strength degradation caused by full stress reversals.
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Acknowledgments
The research was supported by the Pacific Earthquake Engineering Research (PEER) Center under the National Science Foundation Award No. NSFEEC-9701568. The first writer also acknowledges support from University Grants Committee (UGC) of Hong Kong—Strategic Initiatives UNSPECIFIEDRPC11EG27 and the Li Foundation Heritage Prize. We also thank anonymous reviewers for their helpful comments to improve the quality of the paper.
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Published In
Journal of Geotechnical and Geoenvironmental Engineering
Volume 137 • Issue 12 • December 2011
Pages: 1143 - 1153
Copyright
© 2011 American Society of Civil Engineers.
History
Received: Dec 24, 2007
Accepted: Apr 8, 2011
Published online: Nov 15, 2011
Published in print: Dec 1, 2011
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