Abstract
In a prestressed concrete box girder bridge, the need to contain and deviate the longitudinal tendons of the internal prestressing increases the web thickness and the self-weight of the deck. As the span increases, the reduction of dead load is a primary need. It is the most important load, resisted first by the construction equipment, and then by the structure itself. Reductions to dead load permit savings in equipment costs while creating a reserve for service loads. External prestressing allows the combination of conventional materials to create innovative prestressed composite structures. Compared with conventional prestressed concrete box girders, these structural schemes are lighter and more efficient, and may extend the field of application of several conventional construction techniques. (A)
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