The objective of this research was to develop practical methodologies and procedures for evaluating and rating existing steel bridges based on inelastic analysis. In the development of the inelastic rating procedures, the following factors were considered: plastic moment and shear capacity; permissible permanent deflections; and serviceability of the bridge and bridge deck. In addition, the research considered the frequency and form of inspections, material characteristics, state of deterioration, and other important factors.

The final report was published as NCHRP Report 352. The final report contains the procedures for steel bridge evaluation and rating based on inelastic criteria, recommended specification provisions for consideration by AASHTO, and documentation on several computer programs that were developed during the course of research that assist in the use of the procedures.