Evaluation and Testing of Five Bridges for Northampton County, PA
Pennoni’s Intelligent Infrastructure Systems (IIS) coordinated field testing and load rating analysis for five Northampton County, PA bridges. Each of the bridges was subjected to forced vibration testing using THMPER™ (Targeted Hits for Modal Parameter Estimation and Rating) developed by Drexel University, which allows for the efficient collection of structural response measurements. The bridges were found to have load ratings greater than 40 tons for the HL-93 live load model (Strength I Load Rating) employed by the AASHTO Manual for Bridge Evaluation. This indicates that each bridge has sufficient load-carrying capacity, and does not need to be posted for structural safety reasons. IIS is working with the County and PennDOT to have the postings removed.