United States Department of Transportation
i
Time-Dependent Deformation Behavior of Prestressed High Performance Concrete Bridge Beams
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1997-10-01
[PDF-3.17 MB]
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TRIS Online Accession Number:00789905
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Abstract:Most of the bridges that are currently part of the United States infrastructure were constructed following the passage of the Federal Aid Highway Act in 1956 (1). Today, many of these bridges do not meet current federal and state design standards for geometry, strength, or average daily vehicular traffic. This can be attributed to the excessive demand placed on the infrastructure over the 20- to 30-year period following construction. During that time period, the use of the infrastructure system rapidly increased as tourism, the interstate trade of goods by truck, and the mobilization of people across the nation grew to be economic forces. Yesterday’s bridges were not designed for the size, weight, and volume of today’s car and truck traffic. Consequently, a large percentage of these bridge structures are in need of substantial improvement or complete replacement. It was also shortly after 1956 that the prestressed concrete industry began to flourish. A construction project as large as the interstate system demanded cost-effective structural systems. The development of standardized beam sections, most notably the I-shaped section, made prestressed concrete an efficient alternative for bridge superstructures. However, the strength and durability properties of the concrete used in those bridges are inferior to those of the high strength concrete being developed and implemented today.
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