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Design Considerations in the Rehabilitation of a Historic Arch Bridge across the Tennessee River in Knoxville, Tennessee

机译：翻修田纳西州诺克斯维尔市田纳西河历史悠久的拱桥的设计注意事项

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摘要

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.
机译：田纳西州诺克斯维尔市田纳西河上亨利街上的这座历史悠久的桥是一座六跨，1,389英尺（423 m）长的开放式跨距钢筋混凝土拱桥，两侧是165英尺（50 m）长，三跨方法两端的梁结构。拱跨度从185英尺（56 m）到317英尺（97 m）不等，平均跨度为0.30。为了容纳六个行车道，减少甲板上的伸缩缝数量，并在当前状态下使用现有的拱形结构，设计了一个1,720英尺（524 m）长的连续上部结构单元，其中伸缩缝仅位于基台;然而，对桥梁的分析研究表明，上部结构的连续性和增加的活载要求共同作用，导致桥梁各结构构件各个部位的力增大。结合使用了创新的设计技术来减轻这些不利的负载影响。桥梁的改进是根据《国家历史保护法》和1966年的《交通部法》进行设计的。

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