Analysis Procedures for Evaluating Superheavy Load Movement on Flexible Pavements, Volume III: Appendix B, Superheavy Load Configurations and Nucleus of Analysis Vehicle
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2018-12-01
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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 the tires and axles. Accommodating SHL movement 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 this Federal Highway Administration project, Analysis Procedures for Evaluating Superheavy Load Movement on Flexible Pavements, a procedure was developed to identify a segment (or element) of the SHL configuration that can be regarded as representative of the entire SHL vehicle. This element is referred to as the nucleus. The vertical stress distribution (or any other pavement response) under the entire SHL configuration can then be estimated by superimposing the stresses calculated under the nucleus, eliminating the need to model the entire SHL vehicle. A sensitivity analysis was conducted to assess the procedure’s accuracy and sensitivity to different pavement structures, SHL cases, and pavement analysis temperatures. Procedures for handling uniform axle and tire spacing of SHL vehicles as well as special SHL cases were also considered.
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