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深切峡谷桥址区高空风特性现场实测研究

张明金 李永乐 余传锦 吴联活

张明金, 李永乐, 余传锦, 吴联活. 深切峡谷桥址区高空风特性现场实测研究[J]. 西南交通大学学报, 2019, 54(3): 542-547. doi: 10.3969/j.issn.0258-2724.20170370
引用本文: 张明金, 李永乐, 余传锦, 吴联活. 深切峡谷桥址区高空风特性现场实测研究[J]. 西南交通大学学报, 2019, 54(3): 542-547. doi: 10.3969/j.issn.0258-2724.20170370
ZHANG Mingjin, LI Yongle, YU Chuanjin, WU Lianhuo. Field Measurements Study on High-Altitude Wind Characteristics of Bridge Site in Deep Gorge[J]. Journal of Southwest Jiaotong University, 2019, 54(3): 542-547. doi: 10.3969/j.issn.0258-2724.20170370
Citation: ZHANG Mingjin, LI Yongle, YU Chuanjin, WU Lianhuo. Field Measurements Study on High-Altitude Wind Characteristics of Bridge Site in Deep Gorge[J]. Journal of Southwest Jiaotong University, 2019, 54(3): 542-547. doi: 10.3969/j.issn.0258-2724.20170370

深切峡谷桥址区高空风特性现场实测研究

doi: 10.3969/j.issn.0258-2724.20170370
基金项目: 国家自然科学基金资助项目(51708464,51525804)
详细信息
    作者简介:

    张明金(1984—),男,讲师,博士,研究方向为桥梁风工程,E-mail:Zhang-Minjin@swjtu.edu.cn

    通讯作者:

    李永乐(1972—),男,教授,博士,博士生导师,研究方向为桥梁风工程及车桥耦合振动,E-mail:lele@swjtu.edu.cn

  • 中图分类号: U442

Field Measurements Study on High-Altitude Wind Characteristics of Bridge Site in Deep Gorge

  • 摘要: 架设在深切峡谷中的大跨度桥梁,由于桥址区地形地貌复杂,桥面离开谷底较高,桥址区的风特性一般无法通过抗风规范直接确定. 为确定深切峡谷桥址区高空的风特性,利用大桥施工过程中的猫道,在大桥跨中位置处布置了一套三维超声风速仪,对桥址区高空中的风特性进行了现场实测,获得了7 899条有效的脉动风速时程,以此为基础对桥址区高空的风特性(平均风速、风向、风攻角、紊流度、紊流积分尺度、功率谱)进行了分析. 研究结果表明:深切峡谷桥址区高空风特性受地形的影响已经明显减弱,其风攻角均值趋于0,同时高空的紊流积分尺度更加接近平原地区,紊流积分尺度均值比规范推荐值要大.

     

  • 图 1  龙江大桥桥型布置(单位:m)

    Figure 1.  Arrangement of Longjiang Bridge (unit:m)

    图 2  现场实测照片

    Figure 2.  Field measurement photos

    图 3  风速原始数据(2015-07-14)

    Figure 3.  Raw wind data (2015-07-14)

    图 4  风速、风向及风攻角

    Figure 4.  Wind velocity,direction and attack angle

    图 5  紊流度

    Figure 5.  Turbulence scale

    图 6  紊流积分尺度概率分布

    Figure 6.  Probability distribution of turbulence integral

    图 7  典型大风天功率谱

    Figure 7.  Power-spectrum densities of a typical windy day

    图 8  功率谱对比

    Figure 8.  Comparison of power-spectrum densities

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出版历程
  • 收稿日期:  2017-05-15
  • 修回日期:  2018-04-23
  • 网络出版日期:  2019-02-23
  • 刊出日期:  2019-06-01

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