Simplified Lateral Analysis of Deep Foundation Supported Bridge Bents: Driven Pile Case Studies
Publication: Journal of Bridge Engineering
Volume 16, Issue 4
Abstract
A simplified approach for modeling soil and foundation system supported bridge bents is applied to three bridges that represent three pile types and three superstructures. This point-of-fixity approach is applied by modeling the bridge bent substructure as an elastic frame. The models are compared with more refined analyses in FB-MultiPier, with SAP as an independent verification tool, using pile sections with nonlinear soil, pile, and pile cap material properties. The results for simple pile bents show that an equivalent frame model provides similar moment, shear, and displacement values as those obtained from both the SAP and MultiPier nonlinear analyses. Analysis results also indicated that the equivalent frame model parameters are particularly sensitive to the comparable selection of both axial and lateral loads. If lateral loads used to develop the equivalent model are higher than experienced, the axial and lateral deflections and moments will also be higher. For design purposes, this is conservative.
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Acknowledgments
The authors gratefully acknowledge the efforts the North Carolina Department of Transportation (NCDOT) Structures and Geotechnical Units for funding this research and for their technical contributions throughout the course of the work. However, the contents of this report reflect the views of the authors and not necessarily the views of the University, the NCDOT, or the Federal Highway Administration at the time of publication. This paper does not constitute a standard, specification, or regulations. Mr. Robinson also gratefully acknowledges the USDOT’s Eisenhower FellowshipUSDOT program for its funding and support of his graduate studies.
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Information & Authors
Information
Published In
Journal of Bridge Engineering
Volume 16 • Issue 4 • July 2011
Pages: 558 - 569
Copyright
© 2011 American Society of Civil Engineers.
History
Received: Oct 13, 2008
Accepted: Sep 14, 2010
Published online: Jun 15, 2011
Published in print: Jul 1, 2011
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