Horizontal Curved Steel Box Girder Bridge
AASHTO first published Guide Specifications for Horizontally Curved Highway Bridges in 1980. These Guide Specifications included Allowable Stress Design (ASD) provisions developed by the Consortium of University Research Teams (CURT) and approved by ballot of the AASHTO Highway Subcommittee on Bridges and Structures in November 1976. CURT consisted of Carnegie-Mellon University, the University of Pennsylvania, the University of Rhode Island and Syracuse University. The 1980 Guide Specifications also included Load Factor Design (LFD) provisions developed in American Iron and Steel Institute (AISI) Project 190 and approved by ballot of the AASHTO Highway Subcommittee on Bridges and Structures (HSCOBS) in October 1979. The Guide Specifications covered both I and box girders.
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