Dynamic Response of Precast Bridge System

The Beaver Creek Bridge on U.S. Highway 6 in Utah has a span of 88 ft and was built in 2009. Bridge elements included prestressed concrete girders and post-tensioned precast concrete deck panels reinforced with glass fiber reinforced polymer (GFRP) bars. Some of the deck panels and the girders were instrumented for health monitoring. The response of the bridge to traffic loads was collected remotely and continuously for three years. Collected data include vertical accelerations of the girders measured through accelerometers from truck loads. Testing of the bridge included five truck load tests which were carried out at various times. Dynamic truck load data collected include dynamic deflections, damping and impact factors. The response of the girders is compared to design requirements as well as finite element analyses from computer-generated models. It is shown that after three years in service, the performance of the bridge, including the precast deck panels with GFRP reinforcement, is well within the design requirements.

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