Improved LRFD/LRFR specifications for permit and fatigue load truck.
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Improved LRFD/LRFR specifications for permit and fatigue load truck.

Filetype[PDF-2.16 MB]


  • English
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    Details:

    • Corporate Creators:
      CTC & Associates LLC
    • Subject/TRT Terms:
    • Resource Type:
      Tech Report
    • Geographical Coverage:
      California
    • Corporate Publisher:
      California. Department of Transportation
    • Abstract:
      Bridge design and evaluation are moving toward the American Association of State Highway and Transportation

      Officials (AASHTO) load and resistance factor design/load and resistance factor rating (LRFD/LRFR)

      specifications using calibrated truck load models and associated load factors. Current code has load factors

      determined by national data, some of which is quite old and doesn’t reflect current traffic and load patterns.

      Additionally, loads vary greatly from site to site across the country, and California is unique in many aspects of the

      distribution of truck loading on its highway systems.

      Caltrans is embarking on a project to produce a revised permit vehicle and load factors for LRFD/LRFR based on

      California weigh-in-motion (WIM) data and permit routing policies. To aid in this effort, we identified and reviewed

      research reports from national and state sources in which state-of-the-art WIM data were applied to bridge design

      and evaluation, and were used in calibrating reliability-based load and resistance factors. We looked particularly for

      states that have gone through similar processes with special interest in the incorporation of side-by-side occurrences

      of truck traffic and detailed calibrations of the load factors.

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