DESIGN AND CONSTRUCTION OF FLORIDA’S FIRST SPLICED CURVED CONCRETE U-GIRDER BRIDGES: THE SR 417 AND BOGGY CREEK ROAD INTERCHANGE

摘要

The new SR417 and Boggy Creek road interchange, which will soon begin construction, includes two new bridges employing spliced post-tensioned curved concrete U-girders. These systems have been extensively used in Colorado, but have yet to be constructed in Florida. Fly-over ramps were initially designed with steel box girders, but spliced precast concrete U-girders were eventually selected as an economical alternative. During the design phases of this design/bid/build project, coordination with PCI, the Colorado DOT, and other design firms was integral to developing economical design details, taking advantage of experience gained from previously completed projects.rnFly-over ramps had varying span lengths up to 220’, total lengths between 1411’ and 2708’, and a minimum horizontal radius of 955’. A full 3D computer model was developed using the RM Bridge software package, which had the capability to analyze static and time-dependent loading conditions resulting from the staging and erection sequences required during construction. The project utilizes standard cross-sections and details developed and published by PCI. This paper will discuss general details of the two bridges, the analysis procedures that were used, and the lessons learned from the design and production process of Florida’s first set of spliced post-tensioned curved concrete U-girder bridges.