Centrifuge Modeling of Improved Design for Rocking Foundation Using Short Piles
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 145, Issue 8
Abstract
Rocking foundations have emerged as an attractive design to reduce the seismic loads of structures during strong earthquakes. However, they cannot be applied in the field directly because of the permanent deformation caused by their rocking behavior. To reduce the permanent deformation induced by a rocking foundation, installation of an unconnected pile below the foundation has been suggested as an improved design. The region of significant plastic strains beneath the foundation caused by the rocking behavior is located at a shallow depth; thus, the length of the unconnected pile is reduced relative to the case of connected piles. In this study, to determine the optimized design for a rocking foundation, horizontal slow cyclic tests and dynamic centrifuge shake-table tests were performed for various types of foundation models incorporating short piles. The foundation–structure system was designed to exhibit rocking-dominant behavior. Based on the results of the horizontal slow cyclic tests and dynamic centrifuge tests, the rocking behaviors of the tested models were compared. A setup featuring unconnected short piles with a soil layer is proposed as an optimized rocking foundation design, focusing on the reduction of the permanent deformation of soil.
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Acknowledgments
This research was also supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF), funded by the Ministry of Education (Grant No. 2014R1A6A3A04056405). The authors acknowledge the KREONET service provided by the Korea Institute of Science and Technology Information. The authors would like to thank the staff of the centrifuge facility of KAIST (Mr. Seungbok Lee and Mr. Kyeongsik Seo).
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Information
Published In
Journal of Geotechnical and Geoenvironmental Engineering
Volume 145 • Issue 8 • August 2019
Copyright
©2019 American Society of Civil Engineers.
History
Received: Oct 31, 2017
Accepted: Jan 10, 2019
Published online: May 20, 2019
Published in print: Aug 1, 2019
Discussion open until: Oct 20, 2019
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