Broadway Bridge tied arches replacement project, USA

IF 1.5 Q3 ENGINEERING, CIVIL
Natalie McCombs, Sarah Larson
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引用次数: 0

Abstract

The new Broadway Bridge over the Arkansas River is located in downtown Little Rock, Arkansas, USA. The Arkansas Department of Transportation replaced the existing historical structure, which was costly to maintain and considered structurally deficient. The new iconic structure consists of two basket-handled 134 m tied-arch bridges which are designed to accommodate 24 000 vehicles daily and includes a shared-used path. The US$98 million bridge was completed in 2017. Located along the existing alignment in a downtown metropolitan area, impacts to traffic were a prime concern. The bridge was closed to traffic for 6 months to allow for construction and to float the new arches into place. Throughout design, fracture critical members were given careful consideration. The tie-girder was designed with a bolted connection to prevent a fracture in one plate from propagating throughout the cross-section. It was then analysed as a three-sided section at the extreme event limit state. This internal redundancy minimised the potential risk of a catastrophic structural failure. This paper discusses the design considerations for the fracture-critical members, the construction technique, and the expected movement of the main-span tied-arch superstructures.
美国百老汇大桥系拱更换工程
阿肯色河上的新百老汇大桥位于美国阿肯色州小石城市中心。阿肯色州交通部取代了现有的历史建筑,因为该建筑维护成本高昂,而且被认为存在结构缺陷。新的标志性建筑由两座134米长的吊桥组成,设计每天可容纳24000辆汽车,并包括一条公用道路。这座耗资9800万美元的桥梁于2017年完工。该项目位于市区的现有路线上,对交通的影响是一个主要问题。这座桥被关闭了6个月,以便施工和漂浮新的拱门到位。在整个设计过程中,对断裂关键构件进行了仔细考虑。系梁设计为螺栓连接,以防止一块板的断裂传播到整个截面。然后将其作为极端事件极限状态下的三面截面进行分析。这种内部冗余将灾难性结构故障的潜在风险降至最低。本文论述了主跨系拱上部结构临界构件的设计考虑、施工工艺及预期位移。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CiteScore
3.00
自引率
10.00%
发文量
48
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