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Calibration of LRFR live load factors using weigh-in-motion data.
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2006-06-01
[PDF-4.03 MB]
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Abstract:The Load and Resistance Factor Rating (LRFR) code for load rating bridges is based on factors calibrated from structural
load and resistance statistics to achieve a more uniform level of reliability for all bridges. The liveload factors in the
LRFR code are based on load data thought to be representative of heavy truck traffic nationwide. However, the code
allows for recalibrating liveload factors for a jurisdiction if weigh-in-motion data of sufficient quality and quantity are
available. The Oregon Department of Transportation is implementing customized liveload factors based on the analysis
described in this report. The relatively low liveload factors obtained in the Oregon calibration are a logical outcome of the
regulatory and enforcement environment in Oregon.
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