简化U形峡谷风速分布及其对悬索桥抖振响应的影响

doi:10.13229/j.cnki.jdxbgxb.20221197

摘要/Abstract

摘要：

使用理论推导和地形试验的方法研究了简化U形峡谷的风速规律，并分析了峡谷中大跨径悬索桥的抖振响应。研究表明：简化U形峡谷中的风速是在顺压力梯度、峡谷宽深比等因素综合作用下的结果；风速加速效应随着宽深比的增大而增加；风速的横向分布符合抛物线模式，地形模型风洞试验也验证了抛物线分布的合理性；相比较抛物线分布模式，规范推荐的均匀分布风速模式会高估大跨径悬索桥主梁位置的抖振位移响应和关键位置的抖振内力响应。本文研究结果可为峡谷地区桥梁抗风设计提供参考。

关键词: 桥梁工程, U形峡谷, 悬索桥, 风速分布, 抖振响应, 理论推导, 地形模型风洞试验

Abstract:

The wind speed law in the simplified U-shaped valley was studied by theoretical deduction and terrain model wind tunnel test， and the buffeting response of a long-span suspension bridge in the valley was evaluated. The results demonstrate that the wind speed in the simplified U-shaped valley is the result of combined effects of pressure gradient and width to depth ratio. The acceleration effect of wind speed grows with the increase of the width to depth ratio. The spanwise distribution of wind speed conforms to the parabolic model， and the result of the terrain model wind tunnel test also verifies its rationality. Compared with the parabolic distribution model， the uniform distribution wind speed model recommended by the Code overestimates the buffeting displacement response at the main girder position and the internal force response at the key position of the bridge. The research can provide a reference for bridge wind-resistant design in the valley.

Key words: bridge engineering, U-shaped valley, suspension bridge, wind speed distribution, buffeting response, theoretical derivation, terrain model wind tunnel test

中图分类号:

U442

王俊,李加武,王峰,张久鹏,黄晓明. 简化U形峡谷风速分布及其对悬索桥抖振响应的影响[J]. 吉林大学学报(工学版), 2023, 53(6): 1658-1668.

Jun WANG,Jia-wu LI,Feng WANG,Jiu-peng ZHANG,Xiao-ming HUANG. Wind speed distribution in simplified U⁃shaped valley and its effect on buffeting response of long⁃span suspension bridge[J]. Journal of Jilin University(Engineering and Technology Edition), 2023, 53(6): 1658-1668.

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工况编号	宽度B/mm	深度H/mm	半径R/mm	宽深比ε
U₁	600	600	600	1.00
U₂	500	600	600	0.83
U₃	400	600	600	0.67
U₄	300	600	600	0.50
U₅	200	600	600	0.33

振型号	悬索桥频率/Hz	振型描述
1	0.061	一阶正对称侧弯
2	0.098	一阶反对称竖弯
3	0.146	一阶正对称竖弯
4	0.148	一阶反对称竖弯
13	0.302	一阶正对称扭转
14	0.307	主缆侧弯
17	0.335	一阶反对称扭转
30	0.506	二阶反对称扭转

工况序号	展向风速		目标谱
工况序号	分布模式	风速/（m·s^-1）	顺风向	竖向
1	均匀	35	Simiu	Panofsky
2	抛物线	35	Simiu	Panofsky

位置	顺向轴力	竖向剪力	横向剪力	扭转弯矩	横向弯矩	竖向弯矩
主梁左塔梁端	0.74	0.45	0.47	0.47	0.60	0.19
主梁主跨1/4L	0.77	0.53	0.35	0.61	0.78	0.19
主梁主跨1/2L	0.19	0.45	0.65	0.51	0.39	0.15
主梁主跨3/4L	0.74	0.48	0.30	0.83	0.95	0.16
主梁右塔梁端	0.74	0.37	0.57	0.45	0.52	0.15
位置	竖向轴力	面内剪力	面外剪力	扭矩	面外扭矩	面内扭矩
桥塔左塔底	0.67	0.40	0.99	0.74	0.94	0.14
桥塔右塔底	0.41	0.42	0.51	0.52	0.49	0.15

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