AEROELASTIC MODEL TEST STUDY ON A BRIDGE PYLON CONSIDERING THE INTERFERENCE EFFECTS OF SURROUNDING STRUCTURES
AEROELASTIC MODEL TEST STUDY ON A BRIDGE PYLON CONSIDERING THE INTERFERENCE EFFECTS OF SURROUNDING STRUCTURES
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考虑周围结构干扰影响的桥塔气动弹性模型试验研究
DOI：
10.1142/s0219455413500119
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发表时间：
2013-05
影响因子：
3.6
通讯作者：
胡晓红
中科院分区：
文献类型：
--
作者：
马如进;胡晓红
建筑物间的干扰效应一直是结构风工程研究的热点问题。关于这一问题的研究主要集中在高层建筑上。对于大跨度桥梁，结构间的干涉效应很少被讨论。本文介绍了一个独立桥塔与两座大型冷却塔相邻的气动力弹性模型试验。通过模态分析，得到了结构的模态振型。然后通过对两座冷却塔进行气弹模型试验时的边界层模拟，分别得到了桥塔在平稳流和湍流流中的振动响应。研究表明，两座大体积冷却塔对桥塔风振响应的干扰作用不容忽视。在光滑流场中，由于迎风冷却塔的规则脱落涡，干扰效应是明显的，在下风桥塔的低阶模态上诱导强烈的共振响应。但在湍流中，这种干扰效应大大减弱。此外，当冷却塔位于桥塔的正上风方向时，应给予更多的关注。它们的干涉效应肯定会在纵向方向上引起巨大的共振，这是不可忽视的。通过1：500的水流试验，对考虑干扰效应的桥塔紊流进行了测量，揭示了冷却塔的干扰效应。最后，提出了一个考虑干扰效应的动力放大系数，建议索塔设计时取2.25。
The interference effect between buildings has been a popular issue in structural wind engineering for a long time. Most researches about this issue have been focused mainly on high-rise buildings. For long-span bridges, the interference effects between structures are rarely discussed. In this paper, an aerodynamic elastic model test of a free-standing bridge pylon located adjacent to two large-scale cooling towers is presented. Through the mode analysis, the structure mode shapes are obtained. Then by the simulation of the two cooling towers in the boundary layer during the aeroelastic model test, the vibration responses of the bridge pylon in smooth and turbulence flows are obtained respectively. The study shows that the interference effect of the two huge-volume cooling towers on the wind induced vibration responses of the bridge pylon should not be neglected. In smooth flow, due to the regular shedding vortex from the upwind cooling towers, the interference effect is evident in that strong resonant responses are induced on the lower-order modes of the downwind bridge pylon. However, in turbulence flow, this kind of interference effect is greatly reduced. Moreover, more attention should be paid to the case when the cooling towers are located at the perfectly right upwind direction of the bridge pylon. Their interference effect will certainly cause great resonant vibrations in the longitudinal direction, which cannot be ignored for granted. Furthermore, the turbulence flow at the bridge pylon considering the interference effect is measured through a 1:500 flow experiment to discover the interference effect of the cooling towers. In the end, a dynamic magnification factor is proposed to take the interference effect into consideration, with a value of 2.25 suggested for the design of pylons.
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DOI：
10.1016/0167-6105(93)90287-x
发表时间：
1993-08
影响因子：
4.8
作者：
Charles C. S. Song;Jianming He
通讯作者：
Charles C. S. Song;Jianming He
DOI：
10.1016/0167-6105(94)00098-x
发表时间：
1995-06
影响因子：
4.8
作者：
W. J. Zhang;Youwu Xu;K. Kwok
通讯作者：
W. J. Zhang;Youwu Xu;K. Kwok
DOI：
10.1142/s0219455409003132
发表时间：
2009-09
影响因子：
3.6
作者：
Sajal Roy;S. Chakraborty
通讯作者：
Sajal Roy;S. Chakraborty
DOI：
10.1016/0167-6105(90)90301-r
发表时间：
1990
影响因子：
4.8
作者：
T. Ho;D. Surry;A. Davenport
通讯作者：
T. Ho;D. Surry;A. Davenport
DOI：
--
发表时间：
1980-03
期刊：
Journal of the Structural Division
影响因子：
--
作者：
J. Armitt
通讯作者：
J. Armitt