Home › 1-PDH Bridge Catalog › BR-L02
1 PDH · about 60 minutes · Course no. BR-L02 · Instructor: Michael Craig, PE
Michael Craig, PE is Senior Vice President and Southeast Director at Strinteg Corporation, leading bridge inspection and structural engineering across eight states and Puerto Rico. In 27+ years he has inspected over 4,000 structures and completed 3,000+ load ratings and 160+ load tests. He has managed repair and preservation design for complex bridges, including cable-stayed bridges. He holds PE licenses in twelve states, DC and Puerto Rico, SPRAT Level 1, and FAA Part 107 credentials.
A bridge that rates well for the HL-93 design load can still need posting for the trucks that actually use it. This course covers the three families of legal-load rating vehicles an engineer must consider under the AASHTO Manual for Bridge Evaluation (MBE) and FHWA policy: the routine commercial vehicles (Type 3, Type 3S2 and Type 3-3), the Specialized Hauling Vehicles (SU4 through SU7, screened by the Notional Rating Load), and the FAST Act Emergency Vehicles (EV2 and EV3). For each family it explains where the model came from, what FHWA memoranda require, how the live load factor and multiple presence are handled, and how results are turned into ratings and posting values. Every regulatory statement is drawn from the MBE, the FHWA memoranda of November 15, 2013 (SHVs) and November 3, 2016 (EVs), the FHWA Questions and Answers documents for each, and 23 CFR 650.313.