复杂群山环境下某桥址的风场特性

沈国辉; 张帅光; 余世策

doi:10.11729/syltlx20200020

复杂群山环境下某桥址的风场特性

doi: 10.11729/syltlx20200020

浙江大学结构工程研究所，杭州　310058

基金项目: 国家自然科学基金（51838012）

详细信息

作者简介:
沈国辉：（1977-），男，浙江台州人，博士，副教授。研究方向：结构风工程和结构计算分析。通信地址：浙江省杭州市浙江大学紫金港校区安中大楼A710（310058）。E-mail：ghshen@zju.edu.cn

通讯作者:
E-mail：ghshen@zju.edu.cn

中图分类号: TU312
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- 文章访问数: 659
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- 被引次数: 0
出版历程
- 收稿日期: 2020-02-24
- 修回日期: 2020-05-24
- 网络出版日期: 2021-08-26
- 刊出日期: 2021-08-25

Wind field characteristics on a bridge site under complex mountain terrain

Institute of Structural Engineering, Zhejiang University, Hangzhou　310058, China

摘要

摘要: 通过地貌模型风洞试验研究复杂群山情况下某桥址的风场特性，分析平均风速、风攻角、湍流强度、湍流积分尺度等随风向角和测点位置的变化特性，获得了复杂群山环境下典型位置测点脉动风速功率谱的变化情况。研究表明：复杂群山环境下，桥址的平均风速均小于梯度风高度的风速；爬坡效应使得顺山谷方向来流（顺风向，即风从谷口吹入）产生显著的正攻角，最大值为+35.3°；顺风向时，桥址各测点的纵向湍流强度和横向湍流强度达到最小，约为10%，其他风向下的湍流强度较大；顺风向时，桥址的湍流积分尺度较大，且随测点高度上升而增大，桥址各测点功率谱较来流功率谱发生明显变化，功率谱高频段能量显著增大、单峰特征降低。
- 地形模型 /
- 风洞试验 /
- 平均风速 /
- 湍流强度 /
- 湍流积分尺度
Abstract: In order to obtain wind field characteristics on a bridge site on a complex mountain terrain, small-scale topographic wind-tunnel model tests are employed. The variation characteristics of the mean wind speed, wind attack angle, turbulent intensity and turbulence integral scale with respect to the wind azimuth and measuring point position are analyzed. The changes of the wind speed spectrum of typical measuring points on the complex mountain terrain are also studied. The results show that the mean wind speeds of all the measuring points on the bridge site are less than that of the gradient height. When wind blows along the valley, significant positive attack angles are produced due to the wind climbing effect, with the maximum value reaching +35.3°. The along-wind and crosswind turbulent intensities in this wind direction reach their minimum values as low as nearly 10%, and become larger in other wind directions. The turbulence integral scale in this direction is much larger than that in other directions, and increases with the increasing height of the measuring point. The wind speed power spectrum in the direction has significant differences compared with the incoming wind speed spectrum, of which the energy in the high frequency section increases significantly and the feature of the single peak diminishes.
- terrain model /
- wind tunnel test /
- mean wind speed /
- turbulent intensity /
- turbulence integral scale

HTML全文

图 1 三维地貌模型

Figure 1. Three-dimensional geomorphic model

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图 2 直径7 km范围的地貌模型

Figure 2. Terrain model with a diameter of 7 km

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图 3 TFI测试仪器

Figure 3. TFI test instrument

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图 4 测点和测试仪器

Figure 4. Measuring points and testing equipment

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图 5 风洞试验风向角

Figure 5. Wind azimuths for wind tunnel test

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图 6 平均风速和湍流强度剖面

Figure 6. Profiles of mean velocity and turbulent intensity

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图 7 归一化脉动风速功率谱

Figure 7. Normalized power spectrum density of velocity

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图 8 各测点的平均风速加速比

Figure 8. Speed-up ratio of measuring points

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图 9 各测点的风攻角

Figure 9. Wind attack angle of measuring point

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图 10 测点3的平均风速加速比与风攻角

Figure 10. speed-up ratio and attack angle of point 3

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图 11 各测点三个方向的湍流强度

Figure 11. Turbulence intensity in three directions of measuring points

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图 12 各测点的积分尺度

Figure 12. Turbulence integral scales of measuring points

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图 13 同一垂直平面内的归一化脉动风速功率谱

Figure 13. Wind speed spectrum in vertical direction

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图 14 各测点不同风向角下的归一化脉动风速功率谱

Figure 14. Wind speed spectrum in horizontal direction

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