Development of a Double Tee Structural System for Highway Bridgesby Paul F. Csagoly, Florida Dep of Transportation, Tallahassee, FL, USA,
Abstract: The fully precast, prestressed double tee beams are tied together by transverse post-tensioning through simple grout filled V-joints. The system provides for complete transversal continuity without any structural overlay, although it is designed for the weight of a wearing surface. By additional post-tensioning in the end zone, the need for end diaphragms can be eliminated. The system is suitable for both cast-in-place and precast barriers. In addition to analytical work, two series of physical tests were carried out. First, half-scale model beams were tested, both individually and jointly, for punching shear, distribution characteristics and ultimate load carrying capacity. Second, four (4) fatigue tests were performed on a two span 1:3. 5 scale continuous bridge model at Florida Atlantic University.
Subject Headings: Bridge tests | Highway bridges | Tension | Model tests | Girder bridges | Beams | Grouting | Structural models
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