Plain Pile Embedment for Exterior Bent Cap Connections in Seismic Regions
Publication: Journal of Bridge Engineering
Volume 19, Issue 4
Abstract
Four full-scale exterior bent cap connections utilizing plain pile embedment were evaluated for suitability in seismic regions. A self-reacting test setup was used to investigate the special case of reverse axial tension and compressive loading expected to occur in the exterior portions of bridge bents. The current state of practice design detail was first evaluated and performed unsatisfactorily. Three additional specimens were then specially designed and evaluated. Specimen variables include embedment depth of the prestessed pile, bent cap reinforcement design, and bent cap dimensions. Specimens were evaluated in terms of moment capacity, plastic hinge length, ductility, and damage to the bent cap. Design alternatives include an idealized hinge connection and two moment transfer connections. The results indicate that the use of plain pile embedment is feasible for regions similar in level of seismicity to South Carolina, provided that the embedment depth is sufficient.
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Acknowledgments
The authors extend their gratitude toward the SCDOT and the Federal Highway Administration (FHWA) for financial support. Special thanks to Dr. David Sanders of the University of Nevada-Reno for his work on the development of the Strut and Tie modeling. Further thanks to Dr. Jeff Mulliken for input, J.R. Parimuha at Florence Concrete Products and both Mr. Eddie Deaver of Holcim Cement and Darryl Peterson of Vishay Micro-Measurements for technical input. Thanks are also extended to Dr. Jose Restrepo for input related to the test setup.
The opinions, findings and conclusions expressed in this paper are those of the authors and do not necessarily reflect those of the SCDOT.
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Published In
Journal of Bridge Engineering
Volume 19 • Issue 4 • April 2014
Copyright
© 2013 American Society of Civil Engineers.
History
Received: Sep 20, 2012
Accepted: Jul 31, 2013
Published online: Aug 2, 2013
Published in print: Apr 1, 2014
Discussion open until: May 13, 2014
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