Box Segmentals: Refining Design

by Rita Robison, Associate Editor; Civil Engineering Magazine,

Serial Information: Civil Engineering—ASCE, 1989, Vol. 59, Issue 10, Pg. 62-64

Document Type: Feature article


Officials at the Florida Department of Transportation (FDOT), which has built more precast concrete segmental box girder bridges than any other state, say their troubles with that design are over. Graceful proportions, good looks from below, relatively low first costs and fast construction are benefits. Problems include unexpected corrosion, cracked decks, failed expansion joints, warped bearing pads, creep and shrinkage. Publication of the AASHTO Guide Specifications in June 1989 represents, according to various designers of precast concrete segmentals, a conservative basis for solving these problems. It contains a new method of shear design and pays special attention to discontinuities at the ends of beams, including diaphragms, corbels and anchorage zones.

Subject Headings: Precast concrete | Bridge design | Girder bridges | Concrete bridges | Box girders | Construction costs | Corrosion | Cracking

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