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Refined Load Ratings

Refined Load Ratings

Refined load ratings improve on traditional approximate methods by using a mathematical model of a bridge to compute member demands. This model is not subject to assumed distribution factors, rather member demands are distributed within the models’ elements according to their stiffness and configuration. This approach can produce more accurate representation of complicated geometries, nontraditional bridges, or any other bridge where simplified live load distribution formulas are either not applicable, or result in a rating that is lower than acceptable.

Intelligent Infrastructure Systems has experience in performing refined load ratings using LFR and LRFR methodologies according to the requirements of AASHTO MBE. Our use of finite element software leverages API interfaces to automate model creation, analysis, results extraction, and load rating procedures to quickly and efficiently produce load ratings from what can be an otherwise tedious process. Our refined load rating effort focuses on a realistic simulation of a bridge’s response to various loading in order to compute a more accurate estimation of demands compared to traditional rating methods.  

For more information about our Refined Load Rating services, please contact us at info@iisengineering.com