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This report compares the performance of the isotropic bridge deck design method, also known as the empirical design method, with that of the conventional AASHTO design method given Michigan's environment and vehicle loads. This study looked at ten isotropic decks and several conventional decks on parallel structures. Since the performance of the isotropic design was found to be satisfactory and comparable to the conventional design, it is recommended that the department continue use of the isotropic design method where cost savings are realized.
The purpose of this research was to evaluate the performance history of continuous bridge decks in the State of Georgia, to determine why the current design detail works, to recommend a new design detail, and to recommend the maximum and/or optimum lengths of continuous bridge decks. The continuous bridge decks have continuous reinforcement over the junction of two edge beams with a construction joint for crack control. The current technical literature and current practices and design procedures were synthesized and summarized. GDOT maintenance reports were reviewed, and preliminary field evaluations were conducted to determine the performance of the continuous deck detail. The effects of bridge movement due to thermal strains, shrinkage, and live loads were considered in simplified analytical studies to better understand the demands placed on the GDOT continuous deck detail. A summary of the preliminary design and length recommendations are provided upon completion of Part 1 of the research.