Nonlinear Load-Deflection Behavior of Reinforced Concrete Drilled Piles in Stiff Clay
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 140, Issue 3
Abstract
The results of three full-scale lateral load tests of cast-in-drilled-hole RC piles are evaluated to provide insights into the soil-pile interaction behavior as represented by curves ( = soil reaction/length; = lateral pile deflection) spanning from elastic conditions to mobilization of the soil capacity. The test sequence enables evaluation of the diameter effects on the behavior as a result of testing two otherwise similar specimens, but with different diameters (0.6 and 1.8 m), and evaluation of the head-fixity effects as a result of testing similar specimens (with a 0.6 m diameter) under flagpole and fixed-head conditions. A constrained exhaustive search procedure that facilitates data interpretation even in the presence of severe shaft nonlinearity is introduced, which was needed because the testing was performed to full structural failure conditions. The curves obtained with the present test data differ from the predictions of a standard (American Petroleum Institute) model, indicating stronger soil reactions for the fixed-head and 1.8-m-diameter flagpole specimens and weaker and softer backbone curves for the 0.6-m-diameter flagpole test.
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Acknowledgments
Major support for this research was provided by the California DOT under Research Contract No. 59A0247 (and amendments thereto), which is gratefully acknowledged. The authors also acknowledge the support and valuable assistance of the CALTRANS staff, particularly Anoosh Shamsabadi and Craig Whitten. George Cooke of GB Cooke & Associates is gratefully recognized and thanked for his assistance in construction of the test specimens. Partial support for this project was also provided by the NEES@UCLA Equipment Site, as an approved shared-use project through funding from NEES, Inc., and National Science Foundation Award CMMI-0402490. Special thanks are also given to the NEES@UCLA research staff (Robert Nigbor, Steve Kang, Steve Keowen, and Alberto Salamanca) for their collaborative efforts, technical support, and assistance in test management.
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Published In
Journal of Geotechnical and Geoenvironmental Engineering
Volume 140 • Issue 3 • March 2014
Copyright
© 2013 American Society of Civil Engineers.
History
Received: Mar 3, 2012
Accepted: Apr 29, 2013
Published online: May 2, 2013
Published in print: Mar 1, 2014
Discussion open until: Apr 26, 2014
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