10. Work Unit No. (TRAIS) 9. Performing Organization Name and Address

The scope of this project is the evaluation of a High Performance Steel (HPS) bridge located in the City of Lexington in Lafeyette County. The bridge number is A6102 and it is located on Rt. 24 over relocated Rt. 13. To better evaluate the load-carrying capacity of the bridge, a nondestructive field test was conducted. The bridge was tested both statically and dynamically using six MS18 trucks as specified in AASHTO (2002). The dynamic load was applied by moving the trucks at different speeds over the bridge deck. The bridge deflection under static load was measured using robotic tacheometry (“total station”) systems (RTS), which is a noncontact deflection measurement technique. RTS offers the capability to measure the spatial coordinates of discrete points on a bridge in three dimensions without having to touch the structure. In this research, both RTS and conventional extensometers (LVDTs) were used to measure the bridge deflections. The RTS was used to monitor the deflection of 19 points located on the bridge girders. The LVDTs were primarily used to measure the dynamic deflection of the bridge; they were mounted in correspondence to three prisms monitored by the total station in order to validate the accuracy of the latter during the static test. The comparison between theoretical results according to AASTHO Standard Specifications and experimental dat