吉林大学学报(工学版) ›› 2023, Vol. 53 ›› Issue (6): 1638-1649.doi: 10.13229/j.cnki.jdxbgxb.20221511

• 交通运输工程·土木工程 • 上一篇    

非平稳极端风作用下大跨桥梁瞬态风致效应分析

冯宇1(),郝键铭1,2(),王峰1,2,张久鹏1,黄晓明3   

  1. 1.长安大学 公路学院，西安 710064
    2.长安大学 风洞实验室，西安 710064
    3.东南大学 交通学院，南京 211189
  • 收稿日期:2022-11-25 出版日期:2023-06-01 发布日期:2023-07-23
  • 通讯作者: 郝键铭 E-mail:Rainingfeng@chd.edu.cn;jianminghao@chd.edu.cn
  • 作者简介:冯宇（1995-），男，博士研究生.研究方向：非平稳风场特性及大跨桥梁抖振.E-mail：Rainingfeng@chd.edu.cn
  • 基金资助:
    国家重点研发计划项目(2021YFB2600600);国家自然科学基金项目(51978077);陕西省自然科学基金项目(2023-JC-QN-0597);重庆市在渝院士牵头创新引导专项项目(2022YSZX-JSX0003CSTB)

Analysis of transient wind⁃induced response of long⁃span bridge under nonstationary wind field

Yu FENG1(),Jian-ming HAO1,2(),Feng WANF1,2,Jiu-peng ZHANG1,Xiao-ming HUANG3   

  1. 1.School of Highway，Chang'an University，Xi'an 710064，China
    2.Wind Tunnel Laboratory，Chang'an University，Xi'an 710064，China
    3.School of Transportation，Southeast University，Nanjing 211189，China
  • Received:2022-11-25 Online:2023-06-01 Published:2023-07-23
  • Contact: Jian-ming HAO E-mail:Rainingfeng@chd.edu.cn;jianminghao@chd.edu.cn

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摘要：

为了研究非平稳风场瞬态效应对风致桥梁响应的影响，基于Hilbert谱进行全桥非平稳风场模拟，采用Cholesky分解嵌入风场空间相性，并引入2-D阶跃响应函数建立了考虑瞬态效应的非平稳风致桥梁抖振响应分析方法。通过下击暴流和台风实测数据提取Hilbert谱，从而高精度地重现真实下击暴流/台风风场。依托某大跨度悬索桥进行非平稳抖振响应分析，探究了非平稳风场瞬态效应对桥梁气动力和抖振响应的影响。研究结果表明：下击暴流风场表现出显著的非平稳特征，时变平均风致瞬态效应明显改变了风-桥耦合系统的气动特征，使阶跃响应函数呈现出显著的时变性，进而影响大跨度桥梁的抖振响应；而在台风风场中，时变平均风致瞬态效应并不显著，对气动力和桥梁抖振响应的影响几乎可以忽略。

关键词: 桥梁工程, 瞬态效应, 非平稳风场, 抖振, 大跨度桥梁

Abstract:

To study the influence of transient effects of nonstationary wind field on wind-induced bridge response， the nonstationary wind field was simulated based on the Hilbert spectrum， and the wind field spatial correlation was introduced by the Cholesky decomposition. The 2-D indicial response function was applied to the nonstationary wind-induced bridge buffeting response analysis method considering the transient effects. The Hilbert spectrum was obtained from the measured data of downburst and typhoon to reappear the real downburst/typhoon wind field with high accuracy. A long-span suspension bridge was selected to implement the nonstationary buffeting response analysis， the influence of transient effects embedded in nonstationary wind field on the aerodynamics and buffeting response of the bridge was discussed. The results show that the downburst presents significant nonstationarity， and the time-varying mean wind-induced transient effects significantly modify the aerodynamics of the wind-bridge interaction system， which exerts a significant impact on the indicial response function and buffeting response of long-span bridges. However， the time-varying mean wind-induced transient effects are insignificant in typhoon case， and the influence on the aerodynamics and the buffeting response is almost negligible.

Key words: bridge engineering, transient effects, nonstationary wind field, buffeting, long-span bridges

中图分类号: 

  • U442

图1

非平稳风速下自激力离散卷积示意图"

图2

基于Hilbert谱的风场模拟流程"

图3

非平稳风速时程和平均风"

图4

模拟脉动风速时程"

图5

下击暴流风速Hilbert谱"

图6

台风风速Hilbert谱"

图7

桥梁示意图（单位：m）"

图8

桥梁有限元模型"

表1

桥梁模态特征"

模态阶次振型特点频率相对误差/%
本文风洞试验本文风洞试验
1一阶正对称横弯一阶正对称横弯0.048 9000.049 411.03
2一阶反对称竖弯一阶反对称竖弯0.087 9100.087 950.05
3一阶反对称横弯一阶反对称横弯0.122 3410.121 740.49
4一阶正对称竖弯一阶正对称竖弯0.125 1180.123 761.10
5二阶正对称竖弯二阶正对称竖弯0.1704010.168 551.10
6二阶反对称竖弯二阶反对称竖弯0.187 9920.185 591.29
7主缆振动主缆振动0.212 4800.207 312.49
8主缆振动主缆振动0.212 6100.215 371.28
9扭转扭转0.217 0200.218 920.87
10主缆振动主缆振动0.220 1800.219 960.10

表2

自激力阶跃响函数参数"

参数a1a2a3b1b2b3
φLh

-3.669

E-01

-1.288E+02

1.302

E+02

3.721

E+00

1.293

E-01

1.271

E-01

φLα

1.280

E+04

7.918

E+00

-1.280E+04

3.218

E-01

5.282

E-01

3.219

E-01

φMh

1.663

E+02

-1.826E-04-1.656E+02

1.142

E-02

1.051

E+00

1.121

E-02

φMα

2.752

E-01

1.348

E+03

-1.348E+03

6.814

E-01

1.691

E-01

1.692

E-01

图9

自激力阶跃响应函数"

图10

抖振力阶跃响应函数"

图11

下击暴流作用下桥梁跨中抖振响应"

图12

台风作用下桥梁跨中抖振响应"

图13

下击暴流作用下桥梁跨中抖振响应RMS"

图14

台风作用下桥梁跨中抖振响应RMS"

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