2005•Bridges Conversations in Global Politics and Public PolicyRequires access
Replacing an Historic Bridge
Shanks, Colvin John
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Abstract
This article describes the replacement of a 91-year old bridge in Hamilton, Ohio's historic district. The historic significance of the original structure--as well as structural, architectural, hydraulic, utility and traffic constraints-- created a number of challenges in designing a replacement. The bridge engineer met these challenges by using spliced precast post-tensioned concrete girder construction for the new bridge. A 6-lane, 5-span bridge was designed with elliptically-shaped concrete arches similar in depth to that of the existing bridge. The new bridge meets Miami Conservancy District stipulations that the bridge not cause an increase in backwater and that the anticipated blockage of the river (caused by temporary construction work) not lead to the levees being over-topped.