Live-Load Moment-Distribution Factors for an Adjacent Precast Prestressed Concrete Box Beam Bridge with Reinforced UHPC Shear Key Connections
Publication: Journal of Bridge Engineering
Volume 22, Issue 11
Abstract
In this study, the live-load moment-distribution factors (LLMDFs) were evaluated for an adjacent precast prestressed concrete box beam bridge. The bridge used a new shear key configuration, which was grouted with ultrahigh performance concrete (UHPC) and contained noncontact lap-splice dowel bars. The bridge did not contain transverse tie rods, transverse posttensioning, intermediate diaphragms, or a composite deck. As newly developed shear key connections, the LLMDFs are not addressed in the current professional bridge design specifications. Therefore, the LLMDFs were evaluated using static truck load testing. A three-dimensional finite-element model was created and validated by using field results. After validation, the truck load designed by professional bridge standards was applied to the model, and the LLMDFs were evaluated. The results indicate that LLMDFs based on the professional bridge design specifications were conservative compared with the field results. Furthermore, the predicted LLMDFs by means of the professional bridge design specifications were also conservative when the finite-element model was loaded with a truck designed by these specifications and assuming full connectivity for the beams to act as a unit.
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Acknowledgments
The research team would like to extend their gratitude to Steve Luebbe, the Fayette County Engineer; Tim Keller, of the Office of Structural Engineering at the Ohio DOT for the project; Benjamin Graybeal of the TFHRC, Federal Highway Administration; Luke Dlugosz and Kyle Nachuk of LaFarge North America and Vic Perry of V.iConsult, Inc. (formerly of LaFarge North America); Robert Ballard and Rob Cunningham from URS; and the bridge general contractor, The Righter Company, Inc., from Columbus, Ohio.
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Information & Authors
Information
Published In
Journal of Bridge Engineering
Volume 22 • Issue 11 • November 2017
Copyright
© 2017 American Society of Civil Engineers.
History
Received: Dec 1, 2016
Accepted: May 12, 2017
Published online: Aug 28, 2017
Published in print: Nov 1, 2017
Discussion open until: Jan 28, 2018
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