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AASHTO Load Rating Provisions for Implements of Husbandry (2020)

Chapter: Appendix C - Implementation of Research Findings and Products

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Page 138
Suggested Citation:"Appendix C - Implementation of Research Findings and Products." National Academies of Sciences, Engineering, and Medicine. 2020. AASHTO Load Rating Provisions for Implements of Husbandry. Washington, DC: The National Academies Press. doi: 10.17226/26001.
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Page 138

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138 Implementation of Research Findings and Products This project’s products are recommended to be implemented as AASHTO bridge eval- uation specifications. Such implementation needs to be accepted by the AASHTO Highway Subcommittee on Bridges and Structures (HSCBS). The research team has presented the results to AASHTO HSCBS’ Technical Committee T18 Bridge Management, Evaluation, and Rehabilitation. Another presentation was scheduled in November to Committee T5 Loads and Load Distribution in October 2019. These presentations are to update bridge owners of these products to be fully prepared for implementation, as well as to address any issues/modifications required by them. Both T18 and T5 have requested to include the product in a standalone AASHTO guide manual, which has been attached to this final report. The experiences of first states will be important for eventual national implementation. These states may include, but not be limited to, California, Illinois, Iowa, Kansas, Minnesota, Nebraska, Oklahoma, Washington, and Wisconsin. They have significant agricultural produc- tion and likely face notable demand for IoH access to public roads. They had representatives participating in this project and/or the FHWA pooled fund study on IoH as panel members. It is recommended that their experiences when available be gathered as the basis for a possible update of the proposed provisions. It is also recommended that further efforts be spent on gathering more WIM data involving IoH loads. Such efforts will expand and improve understanding of IoH operation, which will help refine proposed provisions for specific applications. A P P E N D I X C

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Farm equipment, generally referred to as “implements of husbandry” (IoH), has been considered to be local vehicles on farms that do not use public roads often, if at all. As a result, state and local jurisdictions vary widely in managing IoH. Apparently, the growth of IoH has far outpaced that of other legal highway vehicles, warranting concern with bridge safety.

The TRB National Cooperative Highway Research Program's NCHRP Research Report 951: AASHTO Load Rating Provisions for Implements of Husbandry (1) proposes new IoH load-rating provisions for the AASHTO Manual for Bridge Evaluation in load factor rating and load and resistance factor rating (LRFR), along with related revisions to the AASHTO LRFD Bridge Design Specifications; and (2) develops protocols to evaluate IoH with various configurations for load rating and overload permits.

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