ASPIRE is a quarterly magazine published by PCI in cooperation with the associations of the National Concrete Bridge Council. The editorial content focuses on the latest technology and key issues in the Concrete Bridge Industry.
Issue link: http://www.aspiremagazinebyengineers.com/i/306906
16 | ASPIRE , Fall 2007 P R O J E C T Precast concrete spliced-girder technology, which was developed to extend the span lengths for concrete girders, offers other advantages that many designers may not have considered. In particular, they provide a great solution for replacing shorter-span bridges, in which the new design must replicate the aesthetics of the original structure. Replacing an existing bridge in an historic part of town creates unique challenges. Designing for the functional and logistical needs while meeting the public's aesthetic requirements creates a set of design parameters unlike other types of bridges, regardless of length. Spliced girders can provide designers with greater flexibility to customize the shape of the girders to meet a wide variety of aesthetic needs. The High-Main Street Bridge over the Great Miami River in Hamilton, Ohio, is a good example of this technique. The structure is located in the heart of the city's historic district and carries the city's main thoroughfare across the river. The existing bridge, a spandrel-filled concrete arch structure, consisted of five 95-ft- long spans. Built in 1915 to replace yet an earlier single-span steel truss bridge, it was badly deteriorated—but also highly cherished by the community. The existing bridge featured extra-wide sidewalks for pedestrians and cyclists and sweeping views of the river. It was built on the former site of historic Fort Hamilton (active from 1791 to 1796), and a concrete replica of the old log fort wall flanks the east bridge abutment. The four-story-tall Soldiers, Sailors and Pioneers Memorial Building and Heritage Hall—home of the McCloskey Museum—portray the city and county history and dominate the landscape at the bridge's eastern end. American flags fly on each riverbank and small plazas at the eastern end contain plaques and monuments. Replacing such a high-profile bridge required considerable input and great sensitivity. These needs were emphasized by the bridge's eligibility for placement on the National Register of Historic Places and its position as a contributing structure in the Hamilton Civic Center Historic District. Despite this pedigree, however, the structure was structurally and functionally obsolete, requiring an immediate solution. profile HigH-Main Street Bridge / HAmIlton, oHIo EnginEEr: Burgess & niple, Inc., Columbus, ohio OthEr COnsultants: Rosales Gottemoeller & Associates, Columbia, md., and Parsons transportation, new York City PrimE COntraCtOr: Kokosing Co., Fredericktown, ohio PrECastEr: Prestress Services Industries, lexington, Ky., and United Precast, Inc., mount Vernon, ohio, PCI-Certified Producers Pr EC ast COnCrEtE sPECialty EnginEEr: Janssen & Spaans, Inc., Indianapolis, Ind. C OnCrEtE suPPliEr, PrECast girdErs: Anderson Concrete Corp., Columbus, ohio Short-Span Spliced Girders Replicate Historic Design by John C. Shanks Jr., Burgess & Niple, Inc. high-main street Bridge over the great miami river in Ohio features five-span, haunched replacement bridge to replicate original arch Original historic 1915 High-Main Street Bridge. 10802_Aspire_Fall07.indb 16 8/30/07 2:59:59 PM