Influence of Atypical Vehicle Types on Girder Distribution Factors of Secondary Road Steel-Concrete Composite Bridges
Publication: Journal of Performance of Constructed Facilities
Volume 29, Issue 2
Abstract
This paper investigated the influence of atypical agricultural vehicle parameters on girder distribution factors (GDFs) for two simply supported steel-concrete composite bridges located on secondary roads in the United States. As part of the parametric investigation, field measurements were performed on the bridges under the passage of full-scale agricultural vehicles along each bridge centerline. Strain data obtained from field tests were used to determine field GDFs. Both field data and GDFs were used to calibrate a finite element model of the bridge. Data from over in-use one hundred agricultural vehicles were collected, and then each vehicle was applied to the model to compute analytical GDFs. These vehicles were analytically and statistically investigated to determine the sensitivity of GDFs to vehicle parameters, including maximum vehicle axle load, gage width, and spacing distributions. Based upon field strain investigation for the two bridges, the responses of the central girders were greater than those of the exterior girders, resulting in greater field GDFs for central girders than those of the exterior girders. Results also indicated from the sensitivity study that each girder had different levels of correlation between GDFs and single vehicle parameters.
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Acknowledgments
This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (Grant No. 2012R1A1A1041521). This research was also partially supported by a pooled fund project sponsored by the Iowa Department of Transportation (DOT), Minnesota DOT, Illinois DOT, Nebraska DOT, Oklahoma DOT, Kansas DOT, Wisconsin DOT, and the USDA Forest Products Laboratory. Many thanks are due to the bridge engineers at the Iowa State University Bridge Engineering Center for their support in field testing.
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© 2014 American Society of Civil Engineers.
History
Received: May 7, 2013
Accepted: Dec 20, 2013
Published online: Jul 28, 2014
Discussion open until: Dec 28, 2014
Published in print: Apr 1, 2015
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