Study on the Influence of Wind Fairing Parameters on the Aerodynamic Performance of Long-Span Double-Deck Steel Truss Suspension Bridge

IF 3.1 3区工程技术 Q2 CONSTRUCTION & BUILDING TECHNOLOGY

Buildings Pub Date : 2024-07-22 DOI:10.3390/buildings14072255

Yang Yang, Long Li, G. Yao, Bo Wu, Dawu Wang, Hui Yu, Hao Qu

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引用次数: 0

Abstract

A long-span double-deck steel truss suspension bridge is easy to produce vortex-induced vibration (VIV) at low air velocity, which affects bridge service life. Additional aerodynamic measures play a role in suppressing VIV by changing the aerodynamic shape, which is a common control method. As the main aerodynamic measure to suppress the VIV response, wind fairing is widely used in engineering practice. In order to obtain the optimal additional position and shape parameters of the fairing, Huangjuetuo Yangtze River Bridge is the research target. Through the combination of a wind tunnel test and numerical simulation, the VIV response of the original and fairing section is studied. Based on data analysis, it is revealed that these additional fairings to the upper chord can significantly reduce the VIV response. When the shape parameters of the fairing are h/D = 1/4 and l/D = 1, the VIV inhibition efficiency is the highest, which can reach 65.51%. By analyzing the flow distribution, it can be seen that VIV is caused mainly by vortex separation in the upper bridge board area. Although this wind fairing does not change the original vortex shedding forms, it changes the first separation point and movement direction of the airflow, making the vortex scale generated by the airflow smaller and the vorticity lower, thus effectively suppressing VIV.

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风整流参数对大跨度双层钢桁梁悬索桥空气动力性能的影响研究

大跨度双层钢桁梁悬索桥在低风速时容易产生涡致振动（VIV），影响桥梁的使用寿命。通过改变气动外形的附加气动措施可起到抑制 VIV 的作用，这也是一种常用的控制方法。作为抑制 VIV 响应的主要空气动力措施，风整流罩在工程实践中得到了广泛应用。为了获得整流罩的最佳附加位置和形状参数，黄桷沱长江大桥成为研究对象。通过风洞试验和数值模拟相结合的方法，研究了原桥和整流段的 VIV 响应。数据分析显示，上弦增设的整流罩可显著降低 VIV 响应。当整流罩的形状参数为 h/D = 1/4 和 l/D = 1 时，VIV 抑制效率最高，可达 65.51%。通过分析气流分布，可以看出 VIV 主要是由上桥板区域的涡流分离引起的。这种风整流罩虽然没有改变原有的涡流脱落形式，但改变了气流的第一分离点和运动方向，使气流产生的涡尺度变小，涡度降低，从而有效地抑制了 VIV。

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

Buildings Multiple-

CiteScore

3.40

自引率

26.30%

发文量

1883

审稿时长

11 weeks

期刊介绍： BUILDINGS content is primarily staff-written and submitted information is evaluated by the editors for its value to the audience. Such information may be used in articles with appropriate attribution to the source. The editorial staff considers information on the following topics: -Issues directed at building owners and facility managers in North America -Issues relevant to existing buildings, including retrofits, maintenance and modernization -Solution-based content, such as tips and tricks -New construction but only with an eye to issues involving maintenance and operation We generally do not review the following topics because these are not relevant to our readers: -Information on the residential market with the exception of multifamily buildings -International news unrelated to the North American market -Real estate market updates or construction updates