Load Testing an Assessment of Bridge with Unknown Foundations
The Division of Highways of West Virginia Department of Transportation identified a subset of their bridge inventory posted for load rating that required advanced testing for assurance that the structures could safely sustain repeated overloads. Pennoni’s Intelligent Infrastructure Systems (IIS) and Drexel University executed modeling and live load testing of one such bridge which served as the baseline comparison for the implementation of the THMPER™ (Targeted Hits for Modal Parameter Estimation and Rating and Structural Health Monitoring). Requiring only thirty minutes of traffic interruption in total for THMPER™ to collect data from the Mossy Creek bridge, extracted modal parameters were used to calibrate a finite element model and provide revised load ratings. Additionally, the calibrated model from traditional live load testing was compared to the results from the THMPER™ testing with agreeable conclusions.