State-Specific LRFR Live Load Factors Using Weigh-in-Motion Data
Publication: Journal of Bridge Engineering
Volume 13, Issue 4
Abstract
The LRFR Manual, within commentary Article C6.4.4.2.3, contains provisions for development of site-specific live load factors. In Oregon, truck weigh-in-motion (WIM) data were used to develop live load factors for use on state-owned bridges. The factors were calibrated using the same statistical methods that were used in the original development of LRFR. This procedure maintains the nationally accepted structural reliability index for evaluation, even though the resulting state-specific live load factors were smaller than the national standard. This paper describes the jurisdictional and enforcement characteristics in the state, the modifications used to described the alongside truck population based on the unique truck permitting conditions in the state, the WIM data filtering, sorting, and quality control, as well as the calibration process, and the computed live load factors. Large WIM data sets from four sites were used in the calibration and included different truck volumes, seasonal and directional variations, and WIM data collection windows. Finally policy implementation for actual use of the factors and future provisions for maintenance of the factors are described.
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References
AASHTO. (1994). Manual for condition evaluation of bridges, Washington, D.C.
AASHTO. (2003). Manual for condition evaluation and load and resistance factor rating (LRFR) of highway bridges, Washington, D.C.
AASHTO. (2004). LRFD bridge design specifications, 3rd Ed., Washington, D.C.
Groff, R. (2006). “ODOT LRFR policy report: Liveload factors for use in load and resistance factor rating (LRFR) of Oregon’s state-owned bridges.” Rep., Oregon Department of Transportation, Salem, Ore.
Minervino, C., Sivakumar, B., Moses, F., Mertz, D., and Edberg, W. (2004). “New AASHTO guide manual for load and resistance factor rating of highway bridges.” J. Bridge Eng., 9(1), 43–54.
Moses, F. (2001). “Calibration of load factors for LRFR bridge evaluation.” NCHRP Rep. No. 454, Transportation Research Board, National Research Council, Washington, D.C.
Novak, A. (1999). “Calibration of LRFD Bridge Design Code.” NCHRP Rep. No. 368, Transportation Research Board, National Research Council, Washington, D.C.
Pelphrey, J., and Higgins, C. (2006). “Calibration of LRFR live load factors for Oregon state-owned bridges using weigh-in-motion data.” Kiewit Center for Infrastructure and Transportation Rep., Dept. of Civil Engineering, Oregon State Univ., Corvallis, Ore.
Strathman, J. G., and Theisen, G. (2002). “Weight enforcement and evasion: Oregon case study.” Rep., Center for Urban Studies, College of Urban and Public Affairs, Portland State Univ., Portland, Ore.
Information & Authors
Information
Published In
Journal of Bridge Engineering
Volume 13 • Issue 4 • July 2008
Pages: 339 - 350
Copyright
© 2008 ASCE.
History
Received: Nov 17, 2006
Accepted: May 11, 2007
Published online: Jul 1, 2008
Published in print: Jul 2008
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