United States Department of Transportation
i
Analysis Procedures for Evaluating Superheavy Load Movement on Flexible Pavements, Volume Ⅸ: Appendix H, Analysis of Cost Allocation Associated With Pavement Damage Under a Superheavy Load Vehicle Movement
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2018-12-01
[PDF-1.91 MB]
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Abstract:The movement of superheavy loads (SHLs) has become more common over the years, since it is a vital necessity for many important industries, such as chemical, oil, electrical, and defense. SHL hauling units are much larger in size and weight compared to standard trucks. SHL gross vehicle weights may be in excess of a few million pounds, so they often require specialized trailers and components with nonstandard spacing between tires and axles. Accommodating SHL movements requires the determination of whether the pavement is structurally adequate and involves the analysis of the likelihood of instantaneous or rapid load-induced shear failure. As part of the Federal Highway Administration project, Analysis Procedures for Evaluating Superheavy Load Movement on Flexible Pavements, a mechanistic–empirical based approach that relied on the use of locally calibrated performance models was proposed for the analysis of cost allocation associated with pavement damage under an SHL-vehicle movement. The approach considered many governing factors and provided useful ways to assess pavement damage from a single pass of an SHL vehicle. The approach was based on the determination of critical pavement responses associated with important pavement distress modes. A parametric analysis was conducted, and it was found that several factors can influence the calculation of pavement damage–associated costs (PDACs). For instance, PDACs are highly impacted by pavement temperature, SHL-vehicle operating speed, rehabilitation distress threshold, and variation in pavement structure. On the other hand, the annual daily truck traffic and the selection of the reference vehicle were found to be minimally influential in the cost allocation analysis.
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