Abstract
This paper describes an investigation to quantify the behavior of a precast deck system. As part of this investigation, a live-load test was performed on a steel I-girder bridge made with accelerated bridge construction precast deck panels. It was found that the bridge was behaving compositely in some locations and noncompositely in others. When the bridge was decommissioned, a two-girder specimen was salvaged and transported to Utah State University for shear-capacity testing. The primary shear failure mechanism was found to be buckling of the girder web. A nonlinear finite-element analysis was conducted using ANSYS that was found to replicate the experimental behavior and reproduce the failure mechanism and magnitude. It was concluded that the effect of the noncomposite behavior on the ultimate shear capacity was a reduction of approximately 8.0%. The measured ultimate capacities were compared with estimates calculated according to procedures in the AASHTO LRFD specifications. When using the specified steel strength, the code predicted shear resistance ranging from 8.0% higher to 0.7% lower.
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