宽幅流线型箱梁涡振性能及制振措施研究

李明; 孙延国; 李明水; 伍波

doi:10.3969/j.issn.0258-2724.2018.04.007

宽幅流线型箱梁涡振性能及制振措施研究

doi: 10.3969/j.issn.0258-2724.2018.04.007

李明^1,2,,
孙延国^1,2, ,,
李明水²,
伍波^1,2

基金项目:

国家自然科学基金资助项目 51408505

交通运输部科技项目 201231835250

详细信息

作者简介:
李明(1990-), 男, 博士研究生, 研究方向为大跨度桥梁抗风, E-mail:liming_bridge@163.com

通讯作者:
孙延国(1981-), 男, 讲师, 研究方向为大跨度桥梁抗风, E-mail:ygsun@swjtu.edu.cn

中图分类号: U441.3
计量
- 文章访问数: 549
- HTML全文浏览量: 205
- PDF下载量: 69
- 被引次数: 0
出版历程
- 收稿日期: 2017-02-01
- 刊出日期: 2018-08-01

Vortex-Induced Vibration Performance of Wide Streamlined Box Girder and Aerodynamic Countermeasure Research

LI Ming^{1,2
,},
SUN Yanguo^{1,2
, ,},
LI Mingshui²,
WU Bo^1,2

摘要

摘要: 为了抑制宽幅流线型箱梁涡激振动，以青山长江大桥（大跨度宽幅流线型钢箱梁斜拉桥）为背景，通过1：50节段模型风洞试验，在低阻尼条件下研究了主梁的涡振性能以及不同气动措施包括风嘴、检修车轨道、导流板、抑振板和检修道栏杆对涡振性能的影响.结果表明：采用外形较锐的风嘴可改善主梁的气动性能；通过改变检修车轨道位置、轨道支架高度及在其两侧设置导流板对抑制涡振效果不明显；在防撞栏杆后按隔五封一方式布置抑振板，可以使竖向涡振振幅降低45%；高透风率的圆形截面检修道栏杆可显著改善主梁的涡振性能，使涡振振幅降低63%，并且该措施不会影响桥梁美观性、便于工程应用.通过1：27大比例尺节段模型风洞试验，对高透风率圆形截面检修道栏杆的抑振措施进行了验证，结果表明该措施可有效抑制宽幅流线型箱梁涡振.
- 流线型箱梁 /
- 涡激振动 /
- 风洞试验 /
- 气动措施
Abstract: To suppress the vortex-induced vibration (VIV) of the wide streamlined box girder, the Qingshan Yangtze River Bridge (a long-span cable-stayed bridge with a wide streamlined box girder) was taken as an example. The study of the VIV performance was carried out through a 1:50 scale section model wind tunnel test. The VIV performance of the girder was studied in a low-damping condition, as well as the effects of various countermeasures on such performance, including wind fairing, inspection vehicle rail, guide vane, vibration mitigation plate, and maintenance way railing. The test results show that a sharp wind fairing is favourable to the VIV performance of the girder. The position of the inspection vehicle rail, the height of rail supporter, and the guide vane slightly suppress the VIV response. The vibration mitigation plate, which was installed behind the anti-collision railing such that five seals off one, can reduce the vertical VIV displacement by 45%. The circular maintenance way railing and the high ventilation rate can improve the VIV of the wide streamlined box girder significantly. In particular, the displacement was reduced by 63%. The recommended railing style does not affect the aesthetic of the bridge and is convenient to apply. A 1:27 scale section model test was conducted to verify the countermeasure. The test results show that the recommended maintenance way railing can suppress the VIV of the wide streamlined box girder effectively.
- streamlined box girder /
- vortex-induced vibration /
- wind tunnel test /
- aerodynamic countermeasure

HTML全文

图 1 主梁横断面

Figure 1. Cross-section of the main girder

下载: 全尺寸图片幻灯片

图 2 原断面主梁涡振振幅(缩尺比1:50)

Figure 2. VIV displacement of the main girder with original deck (scale ratio: 1:50)

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图 3 原风嘴及工况1~4的风嘴形状

Figure 3. Wind fairing of original deck and cases 1 - 4

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图 4 检修道栏杆示意

Figure 4. Sketch of the maintenance way railing

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图 5 检修道栏杆对竖向涡振振幅的影响

Figure 5. Effect of maintenance way railing on the vertical VIV displacement

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图 6 采用高透风率圆形检修道栏杆的主梁竖向涡振振幅

Figure 6. Vertical VIV displacement of the main girder with the circular shape maintenance way railing in high ventilation rate

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图 7 原主梁断面竖向涡振振幅

Figure 7. Vertical VIV displacement of the girder with original deck

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图 8 工况21大比例尺节段模型竖向涡振振幅

Figure 8. Vertical VIV displacement of case 21 in the large-scale model test

下载: 全尺寸图片幻灯片

表 1 节段模型主要试验参数

Table 1. Main test parameters of the section model

一阶模态	实桥				模型				风速比
一阶模态	频率 /Hz	阻尼比 /%	等效质量 /(kg·m^-1)	等效质量惯矩 /(kg·m)	频率 /Hz	阻尼比 /%	等效质量 /(kg·m^-1)	等效质量惯矩 /(kg·m)	风速比
对称竖弯	0.213	—	47 158	—	2.873	0.362	18.863	—	3.707
对称扭转	0.559	—	—	7 777 960	7.342	0.351	—	1.244	3.807

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表 2 风嘴形状对竖向涡振振幅的影响

Table 2. Effect of wind fairing on the vertical VIV displacement

工况	竖向涡振振幅最大值/mm
原断面	296.2
1	314.6
2	261.5
3	463.1
4	452.7

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表 3 检修车轨道及导流板抑振措施

Table 3. Mitigation measures of inspection vehicle rail and guide vane

抑振措施	图示	工况
去掉检修车轨道		工况5:去掉检修车轨道
检修车轨道位于斜腹板		工况2:B=4.1 m, H=0.48 m 工况6:B=4.1 m, H=0.70 m 工况7:B=5.2 m, H=0.48 m 工况8:B=6.0 m, H=0.48 m 工况9:B=7.2 m, H=0.48 m
检修车轨道位于底板		工况10:B=3.0 m, H=0.48 m 工况11:B=3.0 m, H=0.70 m
检修车轨道安装导流板		工况12:B=4.1 m, H=0.48 m L=2.2 m, α = 162° 工况13:B = 4.1 m, H = 0.70 m L = 2.2 m, α = 162°

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表 4 检修车轨道对竖向涡振振幅的影响

Table 4. Effect of inspection vehicle rail on the vertical VIV displacement

工况	竖向涡振振幅最大值/mm
5	106.1
6	268.7
7	247.5
8	238.6
9	232.5
10	240.4
11	242.5
12	223.5
13	228.7

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表 5 抑振板对竖向涡振振幅的影响

Table 5. Effect of vibration mitigation plate on the vertical VIV displacement

工况	竖向涡振振幅最大值/mm
14	235.4
15	190.9
16	178.2
17	162.3
18	194.1

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表 6 大比例尺节段模型主要试验参数

Table 6. Main test parameters of the large-scale section model

参数名称	实桥	模型
等效质量/(kg·m^-1)	47 158	64.688
竖弯频率/Hz	0.213	3.353
竖弯阻尼比/%	—	0.370

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