Field-Measured Response of an Integral Abutment Bridge with Short Steel H-Piles
Publication: Journal of Bridge Engineering
Volume 15, Issue 1
Abstract
Integral abutment bridges (IABs) with short steel H-pile (HP) supported foundations ( of pile depth) are economical for many environmentally sensitive sites with shallow bedrock. However, such short piles may not develop an assumed, fixed-end support condition at some depth below the pile cap, which is inconsistent with traditional pile design assumptions involving an equivalent length for bending behavior of the pile. In this study, the response of an IAB with short HP-supported foundations and no special pile tip details such as drilling and socketing is investigated. Instrumentation of a single-span IAB with 4-m-long piles at one abutment and 6.2- to 8.7-m-long piles at the second abutment is described. Instrumentation includes pile strain gauging, pile inclinometers, extensometers to measure abutment movement, earth pressure cells, and thermistors. Pile and bridge response during construction, under controlled live load testing, and due to seasonal movements are presented and discussed. Abutment and pile head rotations due to self-weight, live load, and seasonal movements were all found to be significant. Measured abutment movements were likely affected by both temperature changes and deck creep and shrinkage. Based on the field study results presented here, moderately short HPs driven to bedrock without special tip details appear to perform well in IABs and do not experience stresses larger than those seen by longer piles.
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Acknowledgments
The research reported in this manuscript was conducted with financial support from the Maine DOT. The assistance and advice of Mr. Dale Peabody of the Maine DOT throughout the project duration is sincerely appreciated. The results and opinions reported here are solely those of the writers and do not constitute a design guideline or specification.
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Information & Authors
Information
Published In
Journal of Bridge Engineering
Volume 15 • Issue 1 • January 2010
Pages: 32 - 43
Copyright
© 2010 ASCE.
History
Received: Jul 20, 2007
Accepted: Sep 8, 2009
Published online: Dec 15, 2009
Published in print: Jan 2010
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