布朗克斯-白石大桥:垂直中间护栏扩展增强了空气动力学性能

IF 0.7 Q4 CONSTRUCTION & BUILDING TECHNOLOGY
Gavin Daly, Ted Zoli, S. Stoyanoff
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引用次数: 0

摘要

布朗克斯-白石大桥设计于 20 世纪 30 年代,当时的悬索桥桥面都是由浅板梁加固的,后来发现其中许多都容易受到空气动力不稳定性的影响,如涡流脱落和飘移。在 1939 年通车后的最初几年里,该桥曾出现过轻微、良性的风致振荡,之后又进行了一系列改造,包括留索、加劲桁架和正交异性钢桥面等结构解决方案,以及调谐质量阻尼器和风整流罩等空气动力学改进措施。2015 年的风洞研究证实,最近安装的风整流罩系统和更坚固的正交甲板改善了空气动力性能。随后的修复项目为评估进一步改善桥梁空气动力性能的措施提供了机会。研究发现,在中间护栏顶部加装 3 英尺(0.91 米)高的实心屏风可作为桥面上方的垂直挡板,扰乱涡流的交替模式,降低桥梁的不稳定性。这就促成了中间分隔带扩展装置 (MBE) 的概念设计,该装置由 3 英尺(0.91 米)的实心透明丙烯酸面板组成,固定在现有中间分隔带立柱的顶部,并由管状钢架支撑。为确保这种独特的护栏改装符合当前的行业安全标准,在最终设计进入全面的物理碰撞测试程序(MASH 测试等级 4)之前,使用非线性有限元模型对 MBE 的设计进行了反复碰撞分析研究。本文介绍了这一创新改装项目从风洞试验期间的构思,到设计、耐撞性研究和 2020 年最终施工的全部过程。该项目证明,对中间护栏进行垂直延伸,可以简单而经济地提高现有桥梁的空气动力性能。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Bronx-Whitestone Bridge: Vertical median barrier extension enhances aerodynamics
The Bronx-Whitestone Bridge was designed during the 1930s in an era of suspension bridges with decks stiffened by shallow plate girders, many of which were subsequently found to be vulnerable to aerodynamic instabilities such as vortex shedding and flutter. Following the occurrence of mild and benign wind-induced oscillations in the first several years after opening in 1939, the bridge has undergone a series of retrofits, from structural solutions such as stay cables, stiffening trusses, and a steel orthotropic deck, to aerodynamic enhancements such as a tuned mass damper and wind fairings. Wind tunnel studies in 2015 confirmed the improved aerodynamic performance due to the recently installed wind fairing system and stiffer orthotropic deck. A subsequent rehabilitation project gave the opportunity to assess measures to further improve the aerodynamic performance of the bridge. A 3 ft (0.91 m) tall solid screen added on top of the median barrier was found to act as an above-deck vertical baffle plate, disrupting the alternating pattern of vortices, reducing the susceptibility of the bridge to instabilities. This led to the conceptual design of a Median Barrier Extension (MBE) comprised of 3 ft (0.91 m) solid transparent acrylic panels fixed to the top of the existing median barrier posts, supported by a tubular steel frame. To ensure this unique barrier modification met current industry safety standards, the MBE design was iterated through a crash analysis study using non-linear finite element models before the final design proceeded to a full-scale physical crash testing program to MASH Test Level 4. This paper presents the full timeline of this innovative retrofit project, from conception during wind tunnel testing, through to design, crashworthiness studies and final construction in 2020. This project has demonstrated that a vertical extension to a median barrier can act as a simple and cost-effective enhancement to the aerodynamic performance of existing bridges.
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来源期刊
Bridge Structures
Bridge Structures CONSTRUCTION & BUILDING TECHNOLOGY-
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1.10
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