United States Department of Transportation
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Analysis Procedures for Evaluating Superheavy Load Movement on Flexible Pavements, Volume VII: Appendix F, Failure Analysis of Sloped Pavement Shoulders
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2019-03-01
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[PDF-1.83 MB]
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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. As part of the Federal Highway Administration project, Analysis Procedures for Evaluating Superheavy Load Movement on Flexible Pavements, a method of investigating the stability of a sloped pavement shoulder under an SHL-vehicle movement was developed by modifying the well-accepted wedge method. This new method, with the use of 3D-Move Analysis software, is capable of considering a layered medium with distinct layer-stiffness values along with the unconventional SHL-vehicle loading configuration.(10) To account for the existence of a sloped pavement shoulder in 3D-Move Analysis, computed SHL vehicle-induced stresses are modified using a stress adjustment factor for a sloped shoulder (SAFShoulder). SAFShoulder was determined based on results from large-scale pavement experiments conducted in this study.
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