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EDITORIAL

EDITORIAL Bridge Structures Vol. 5, No. 4, December 2009, 149–150 The HL-93, a combination of the HS20 truck and lane loads along with the AASHTO LRFD live load factors were calibrated using 1975 truck data from the Ontario Ministry of Transportation to project a 75-year liveload occurrence. Because truck traffic volume and weights have increased and truck configurations have become more complex, the 1975 Ontario data do not represent present US traffic loadings. Updating bridge live load models needs representative samples of unbiased truck weight data that meet accepted quality standards. A method that has been developed over the last three decades to capture truck loads in an undetected manner and obtain a true unbiased representation of actual highway loads, is known as the Weigh-In-Motion, or WIM technology. The implementation of WIM systems in recent years has led to improving the quality and quantity of traffic data, which can be used to update the bridge design loads. NCHRP Project 12-76, was performed to develop a set of protocols and methodologies for using available recent WIM data collected at different US sites and recommend a step-by-step procedure that can be followed to obtain live load models for LRFD bridge design. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Bridge Structures IOS Press

EDITORIAL

Mahmoud, Khaled M.
Bridge Structures , Volume 5 (4) – Jan 1, 2009
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Publisher
IOS Press
Copyright
Copyright © 2009 by IOS Press, Inc
ISSN
1573-2487
eISSN
1744-8999
DOI
10.1080/15732480903444542
Publisher site
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Abstract

Bridge Structures Vol. 5, No. 4, December 2009, 149–150 The HL-93, a combination of the HS20 truck and lane loads along with the AASHTO LRFD live load factors were calibrated using 1975 truck data from the Ontario Ministry of Transportation to project a 75-year liveload occurrence. Because truck traffic volume and weights have increased and truck configurations have become more complex, the 1975 Ontario data do not represent present US traffic loadings. Updating bridge live load models needs representative samples of unbiased truck weight data that meet accepted quality standards. A method that has been developed over the last three decades to capture truck loads in an undetected manner and obtain a true unbiased representation of actual highway loads, is known as the Weigh-In-Motion, or WIM technology. The implementation of WIM systems in recent years has led to improving the quality and quantity of traffic data, which can be used to update the bridge design loads. NCHRP Project 12-76, was performed to develop a set of protocols and methodologies for using available recent WIM data collected at different US sites and recommend a step-by-step procedure that can be followed to obtain live load models for LRFD bridge design.

Journal

Bridge Structures – IOS Press

Published: Jan 1, 2009

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