New LRFD-Based Prestressed Concrete Bulb-Tee Girders in Colorado

Abstract

■ Using bridge software for modeling and analysis, a prototype girder series and a proposed new girder series were studied to optimize the girder section and properties. Transportation agencies are interested in bridge structures that can be built rapidly at affordably. Prestressed concrete bulb-tee girders have been used for decades in the United States and offer significant structural and economic advantages (such as long spans, controlled cracking behavior, durability, and improved serviceability) compared with reinforced concrete girders. Precast concrete members enable a superior bridge system because they are produced in a controlled plant environment with high quality control and quality assurance. Cost savings are manifested in the employment of precast concrete bridge girders through reusable forms, reduced on-site construction time, and minimal traffic disruption.