大间距下高耸双烟囱风致特性试验研究

雷伟; 王骑; 李明水; 李志国

doi:10.3969/j.issn.0258-2724.20230056

大间距下高耸双烟囱风致特性试验研究

doi: 10.3969/j.issn.0258-2724.20230056

雷伟^1,,
王骑^{1, 2, ,},
李明水^{1, 2},
李志国^{1, 2}

1.
西南交通大学土木工程学院，四川成都 610031
2.
西南交通大学风工程四川省重点实验室，四川成都 610031

基金项目: 国家自然科学基金（51678508）

详细信息

作者简介:
雷伟（1994—），男，博士研究生，研究方向为结构、桥梁风工程，E-mail：lei_@my.swjtu.edu.cn

通讯作者:
王骑（1980—），男，副教授，博士，博士生导师，研究方向为结构、桥梁风工程，E-mail：wangchee_wind@swjtu.edu.cn

中图分类号: TU279.742
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- PDF下载量: 25
- 被引次数: 0
出版历程
- 收稿日期: 2023-02-15
- 修回日期: 2023-09-11
- 网络出版日期: 2023-11-15
- 刊出日期: 2023-09-28

Experimental Study on Wind-Induced Characteristics of Tall Double Chimneys with Large Spacing

LEI Wei^1
,,
WANG Qi^{1, 2
, ,},
LI Mingshui^{1, 2},
LI Zhiguo^{1, 2}

1.
School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China
2.
Wind Engineering Key Laboratory of Sichuan Province, Southwest Jiaotong University, Chengdu 610031, China

摘要

摘要:
双烟囱结构在自然风作用下存在气动干扰效应，从而诱发较大风致振动，威胁结构安全. 合理计算和预测风振响应是双烟囱抗风设计的关键. 以某中心距为8倍平均直径的双烟囱结构为研究对象，开展刚性模型测力和气弹模型测振风洞试验，将试验结果与中国规范、欧洲规范和CICIND （International Committee on Industrial Construction）规范计算值进行比较，详细研究双烟囱在不同风向角下的风致响应特性. 研究结果表明：在烟囱串列布置下，迎风侧烟囱具有遮挡和干扰效应，一方面使得背风侧烟囱底部弯矩减小，另一方面使其横风向位移大于在其他风向角下的值；由于厂房的干扰效应，风振系数中国规范计算值与试验值接近；当烟囱高度超过厂房高度后，计算值较试验值偏大；对于横向响应，中国规范计算值较试验值大37.1%，欧洲规范计算值与试验值接近，仅偏小6.9%，CICIND规范计算值比试验值小17.1%.
- 双烟囱 /
- 风洞试验 /
- 设计规范 /
- 风振系数 /
- 横风向位移
Abstract:
Double-chimney structure has aerodynamic interference effects under natural wind, which will induce large wind-induced vibrations, further threatening the safety of the structure. Reasonable calculation and prediction of wind-induced vibration responses are essential for wind resistance design of double-chimney structures. A double-chimney structure with a center distance equal to eight times its average diameter was experimentally tested. The wind tunnel tests of force measurement with a rigid model and vibration measurement with an elastic model were carried out. The test results were compared with the calculated values of the Chinese code, European code, and International Committee on Industrial Construction (CICIND) code to explore the wind-induced response characteristics of the double chimneys under different wind angles. The results demonstrate that in tandem arrangement, the chimney on the windward side shows the shielding and interference effects. Therefore, the bending moment at the bottom of the chimney on the leeward side is reduced, and the across-wind displacement is greater than that at other wind angles. The calculated values of wind-induced vibration coefficients are close to the test values due to the interference effects of the power station. When the height of the chimney exceeds the station, the calculated values are greater than the test values. In terms of the across-wind responses, the values calculated by the Chinese code are 37.1% larger than the test values. The values calculated by the European code are close to and only 6.9% smaller than the test values, but the values calculated by the CICIND code are 17.1% smaller than the test values.
- double chimneys /
- wind tunnel tests /
- codes /
- wind-induced vibration coefficients /
- across-wind displacement

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图 1 烟囱前三阶振型

Figure 1. First three modes of vibration of chimney

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图 2 风剖面比较

Figure 2. Comparison of wind profile

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图 3 湍流度剖面比较

Figure 3. Comparison of turbulence intensity profile

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图 4 风向角和坐标系的定义

Figure 4. Definition of wind angle and coordinate system

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图 5 试验模型及风场

Figure 5. Test model and wind field

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图 6 不同高度下烟囱Ⅰ的体型系数

Figure 6. Body configuration coefficient of chimney Ⅰ at different heights

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图 7 烟囱Ⅰ的整体体型系数随24个风向角的变化

Figure 7. Variation of whole body configuration coefficient of chimney Ⅰ with 24 wind angles

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图 8 典型风向角下烟囱Ⅰ的风振系数风洞试验值与规范计算值比较

Figure 8. Comparison of wind tunnel test and values calculated by codes of wind-induced vibration coefficient of chimney Ⅰ at typical wind angles

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图 9 烟囱Ⅰ弯矩值随24个风向角的变化

Figure 9. Variation of bending moment of chimney Ⅰ with 24 wind angles

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图 10 烟囱Ⅰ的合成弯矩值随24个风向角的变化

Figure 10. Variation of synthetical bending moment of chimney Ⅰ with 24 wind angles

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图 11 顶部位移值随24个风向角的变化

Figure 11. Variation of top displacement with 24 wind angles

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表 1 自振频率比较

Table 1. Comparison of natural frequency of vibration

阶数	要求值/Hz	试验值/Hz	差值/%
1	2.938	2.902	1.2
2	16.247	15.525	4.4
3	43.523	41.547	4.5

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表 2 阻力系数随风速的变化

Table 2. Variation of drag coefficient with wind speed

风速/（m·s⁻¹）	雷诺数	阻力系数
5.0	2.8 × 10⁴	0.69
8.0	4.5 × 10⁴	0.73
11.0	6.2 × 10⁴	0.76
14.0	7.9 × 10⁴	0.77
17.0	9.6 × 10⁴	0.78
20.0	11.3 × 10⁴	0.75
23.0	13.0 × 10⁴	0.73
26.0	14.7 × 10⁴	0.74
29.0	16.4 × 10⁴	0.70

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表 3 烟囱顶点横风向位移响应

Table 3. Displacement responses of cross-wind displacement at the top of the chimney m

方法	位移响应值
风洞试验	0.175
中国规范^[24]	0.240
欧洲规范^[25-26]	0.163
CICIND 模式规范^[27]	0.145

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