Optimized Sections for Precast Prestressed Bridge Girders

Abstract

This is a report on an investigation done to evaluate latest prestressed concrete bridge girders in the United States and to determine which are optimum designs that could be promoted as national or regional standards. The study was limited to bridges with pretensioned I- and T-sections with spans in excess of 80 ft, concrete compressive strengths up to 7000 psi, and 5- and 6-in. webs. After completion of the study, Modified Bulb-T girders with 6-in.-thick webs are recommended for use as the national standard in precast, prestressed concrete bridges with spans from 80 to 140 ft.