Title: Design Considerations in the Rehabilitation of a Historic Arch Bridge across the Tennessee River in Knoxville, Tennessee
Author(s): Satrajit Das
Publication: Symposium Paper
Appears on pages(s): 89-108
Keywords: arch rib, bridge, concrete hinge, deck arch, historic, jointless, lock-up device, rehabilitation, reinforced concrete, spandrel column, superstructure-arch rib interaction, sustainability
The historic bridge on Henley Street over the Tennessee River in Knoxville, Tennessee is a six-span, 1,389-foot (423 m) long open spandrel reinforced concrete arch bridge flanked by a 165-foot (50 m) long, three-span approach girder structure at each end. The arch span lengths range from 185 feet (56 m) to 317 feet (97 m) with an average rise-to-span ratio of 0.30. In an effort to accommodate six travel lanes, reduce the number of expansion joints in the deck, and use the existing arch structure in its present condition, a 1,720-foot (524 m) long continuous superstructure unit was designed with expansion joints located only at the abutments; however, analytical studies on the bridge showed that the combined effects of superstructure continuity and increased live load demands led to increased forces at various sections of respective structural components of the bridge. A combination of innovative design techniques were used to mitigate these adverse load effects. The bridge improvements were designed in accordance with the National Historic Preservation Act and the Department of Transportation Act of 1966.