This paper provides a historical overview of the development of horizontally curved steel I girder bridge design specifications in the United States. The background to the development of curved I girder design and analysis provisions in the 1993 and 2003 AASHTO Guide Specifications for Horizontally Curved Highway Bridges is discussed, and the status of recently completed and ongoing curved steel bridge research projects is summarized. In addition, the manuscript focuses on how the 2003 Guide Specifications can be used to analyze and design horizontally curved I girder bridges. Comparisons are made to prior provisions in the 1993 Guide Specifications.
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Linzell et al. (2004) studied this question.