非均匀风下流线型箱梁悬索桥静风稳定性分析
DOI:
作者:
作者单位:

1.重庆大学;2.重庆大学,重庆大学城市科技学院;3.四川建筑职业技术学院;4.湖南澧县住房和城乡建设局

作者简介:

通讯作者:

中图分类号:

基金项目:

国家自然科学基金(51778093);重庆市科委科学技术研究项目(cstc2018jscx-msybl299);重庆市教委科学技术研究项目(KJZD-K201802501)


Aerostatic wind stability analysis of streamline box girder suspension bridge under non-uniform wind
Author:
Affiliation:

1.Chongqing University;2.Chongqing University,City College of Science and Technology, Chongqing University;3.Sichuan College of Architectural Technology;4.Housing and Urban-rural Construction Bureau of Lixian, Hunan province

Fund Project:

National Natural Science Foundation of China (No. 51778093); Natural Science Foundation of Chongqing (No. cstc2018jscx-msybl299); Scientific and Technological Research Program of Chongqing Municipal Education Commission (No. KJZD-K201802501)

  • 摘要
  • |
  • 图/表
  • |
  • 访问统计
  • |
  • 参考文献
  • |
  • 相似文献
  • |
  • 引证文献
  • |
  • 资源附件
  • |
  • 文章评论
    摘要:

    大跨度悬索桥结构轻柔,风致响应明显。借助有限元方法,考虑悬索桥的几何非线性和位移荷载非线性,对非均风攻角来流沿主梁对称分布和非对称分布以及非均匀风速来流沿主梁对称分布和非对称分布时悬索桥的非线性静风稳定性展开研究。结果表明,正攻角来流会降低桥梁的静风失稳临界风速,负攻角来流有利于桥梁抵抗静风失稳,且负攻角来流对桥梁的静风稳定性的影响程度比正攻角来流的影响程度大;非均匀风攻角来流非对称分布时,可由小风攻角来流确定的静风失稳临界风速作为稳定性判断依据,非均匀风攻角来流对称分布时,可以选择平均攻角来流来衡量桥梁的静风稳定性。非均匀风速来流对桥梁的静风稳定性有不利影响,且非均匀风速来流对称分布时的影响比非均匀风速来流非对称分布时的影响更大。在不同初始攻角下,这类来流对桥梁静风稳定性有着相似的影响,桥梁的静风失稳临界风速均随着风速非均匀程度增大而减小。

    Abstract:

    The long-span suspension bridges, which are notable flexibility, are sensitive to wind load. Using the finite element method, considering the geometric nonlinearity and displacement-load nonlinearity, the aerostatic stability of suspension bridges is studied when the non-uniform wind distributes symmetrically and asymmetrically along the main girder. The results show that the flow of positive angle of attack will reduce the critical stability wind speed of the bridges, the flow of negative angle of attack is conducive to the bridges to resist the instability of static wind. The impact of negative angle of attack on the static wind stability of the bridge is greater than that of positive angle of attack. When the flow is asymmetrically distributed, the critical stability wind speed can be determined by small wind angle of attack. When the flow is symmetrically distributed, the mean angle of attack can be selected to measure the aerostatic stability of the bridge. Incoming flow with non-uniform wind speed has an adverse effect on the aerostatic stability of the bridges. Moreover, the influence of symmetric distribution of non-uniform wind speed is greater than that of asymmetric distribution of non-uniform wind speed. Under varieties of initial angles of attack, the influence of non-uniform wind speed inflow on the aerostatic stability of the bridge is the same. That’s to say, the critical wind speed of aerostatic stability of the bridge decreases with the increase of the unevenness of the wind speed.

    参考文献
    相似文献
    引证文献
引用本文
分享
文章指标
  • 点击次数:
  • 下载次数:
  • HTML阅读次数:
  • 引用次数:
历史
  • 收稿日期:2020-07-08
  • 最后修改日期:2020-10-13
  • 录用日期:2020-10-18
  • 在线发布日期:
  • 出版日期: