Protocols for Collecting and Using Traffic Data in Bridge Design (2011) / Chapter Skim
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Pages 5-7
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From page 5... ...
In the LRFD development, it was seen that for two-lane bridges, loading events consisting of two side-by-side trucks govern the maximum load effect. It was calculated that the maximum load effect is equivalent to the effect of a side-byside occurrence where each truck is about 85% of the mean maximum 75-year truck.
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From page 6... ...
Accurate headway information cannot be obtained from fixed weighstations or from truck data collected at highway bypasses. For these reasons it is determined that truck traffic data should be collected through WIM systems that simultaneously can collect headway information as well as truck weights, axle weights, and axle configurations while remaining hidden from view and unnoticed by truck drivers.
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From page 7... ...
The protocols are geared to address the collection, processing, and use of national WIM data to develop and calibrate vehicular loads for LRFD superstructure design, fatigue design, deck design, and design for overload permits. Various levels of complexity are available for utilizing truck weight and traffic data to calibrate live-load models for bridge design.
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