Analysis Procedures for Evaluating Superheavy Load Movement on Flexible Pavements, Volume VI: Appendix E, Ultimate and Service Limit Analyses
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2019-07-01
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Edition:Final Report
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Abstract:The movement of superheavy loads (SHLs) on the Nation’s highways is an increasingly common, vital economic necessity for many important industries, such as chemical, oil, electrical, and defense. SHL hauling units are much larger in size and weight than 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-vehicle movements requires determining whether pavement is structurally adequate and analyzing the likelihood of instantaneous or rapid load-induced shear failure. In this study, as part of the Federal Highway Administration project, Analysis Procedures for Evaluating Superheavy Load Movement on Flexible Pavements, methods for conducting shear failure and service limit analyses in a flexible pavement under an SHL-vehicle movement were developed. Shear failure analysis involves an ultimate and localized analysis conducted to check the adequacy of a pavement structure to withstand shear failure. Meyerhof’s general bearing capacity equation was adopted to investigate the possibility of ultimate shear failure, and the Drucker-Prager yield criterion was used to examine the likelihood of localized shear failure (yield). The service limit analysis was conducted using a deflection-based approach because excessive surface deflections resulting from SHL-vehicle movements may give rise to the rapid deterioration of a pavement structure and development of premature surface distresses (e.g., permanent deformation). To avoid rapid pavement deterioration, SHL vehicle-induced surface deflections were limited to a determined allowable surface deflection.
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