Transition of Railroad Bridge Approaches
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 131, Issue 11
Abstract
Years of investigations have shown that very stiff track structures on railroad bridges and abrupt stiffness changes between the bridge and the approach are two factors that can accelerate the performance problems associated with concrete tie track, ballasted deck concrete bridges. These problems include rapid track geometry degradation and cracking of concrete ties. For the four sites investigated, the resulting geometry degradation (or differential settlement between bridge and approach) came from the ballast and subballast layers, with additional contribution from the underlying soil layers (subgrade). Remedies intended to strengthen the approach subgrade may not be effective, if they are not designed to produce consistent and acceptable track stiffness between the bridge and the approach. The study presented in this paper was conducted on a number of railroad bridges and their approaches on a western railroad in the United States. The objective of the study was to investigate the factors that can cause or accelerate performance problems associated with bridge approach or track transition, and to identify and evaluate appropriate mitigation methods.
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Acknowledgments
The Association of American Railroads and the Federal Railroad Administration sponsored the research presented in this paper. The UP Railway provided assistance and cooperation for the field investigations and tests. Many TTCI and UP engineers, including Duane Otter, Randy Thompson, Satya Singh, Brian Doe, and Bill GeMeiner, have made contributions to various phases of the study.
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© 2005 ASCE.
History
Received: Jan 22, 2004
Accepted: Apr 13, 2005
Published online: Nov 1, 2005
Published in print: Nov 2005
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