The new Hathaway Bridge in Panama City, Florida, is a design-build bridge replacement project that consists of replacing an existing structure with two side-by-side precast segmental box girder bridges. The project was designed by the Orlando office of HNTB Corporation and constructed by Granite Construction Company. Each new bridge has seven 330-ft (100.6-m) spans, 265-ft (80.8-m) transition spans, and 200-ft (61-m) end spans. The load and resistance factor design (LRFD) specification used for the design was the AASHTO LRFD specification (1998 with interims through 2000). The LRFD design is compared with the AASHTO specification requirements (16th edition) as well as the requirements of the "Guide Specifications for Design and Construction of Segmental Concrete Bridges" (2nd edition). Studies during design showed that, for this bridge, the transverse and longitudinal bending requirements under the LRFD specification were similar to what would have been expected under previous specifications using HS20 loading. However, the shear requirements of the LRFD specification for these box girders were less conservative than the requirements of previous specifications.
Samenvatting