Abstract
Recognizing the large market for medium-span bridges, the building industry has focused its attention on the economical construction of these structures. Mechanized construction and the use of standardized members have become important aspects for this type of structure, owing to the numbers to be constructed in the near future and the large size of some of these projects. This paper deals with a comparison of four structural prestressed concrete systems applicable to medium spans: box sections, I-girders, T-girders, and wing sections. Cost comparisons are presented, and conclusions as to the choice of structural sections for optimum medium-span construction are included. The material is derived from a study the authors' company prepared for the United States Federal Highway Authority on the feasibility of standardization of segmental box girder bridges. Key words: bridges, box girders, precast concrete, prestressed concrete.
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