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中央开槽宽度对箱梁涡振特性的影响机理

陈星宇 徐昕宇 郑晓龙 曾永平 李永乐

陈星宇, 徐昕宇, 郑晓龙, 曾永平, 李永乐. 中央开槽宽度对箱梁涡振特性的影响机理[J]. 西南交通大学学报, 2021, 56(2): 238-245. doi: 10.3969/j.issn.0258-2724.20190505
引用本文: 陈星宇, 徐昕宇, 郑晓龙, 曾永平, 李永乐. 中央开槽宽度对箱梁涡振特性的影响机理[J]. 西南交通大学学报, 2021, 56(2): 238-245. doi: 10.3969/j.issn.0258-2724.20190505
CHEN Xingyu, XU Xinyu, ZHENG Xiaolong, ZENG Yongping, LI Yongle. Effect Mechanism of Central Slot Width on Vortex-Induced Vibration Characteristics of Streamlined Box Girders[J]. Journal of Southwest Jiaotong University, 2021, 56(2): 238-245. doi: 10.3969/j.issn.0258-2724.20190505
Citation: CHEN Xingyu, XU Xinyu, ZHENG Xiaolong, ZENG Yongping, LI Yongle. Effect Mechanism of Central Slot Width on Vortex-Induced Vibration Characteristics of Streamlined Box Girders[J]. Journal of Southwest Jiaotong University, 2021, 56(2): 238-245. doi: 10.3969/j.issn.0258-2724.20190505

中央开槽宽度对箱梁涡振特性的影响机理

doi: 10.3969/j.issn.0258-2724.20190505
基金项目: 国家重点研发计划(2017YFB1201204)
详细信息
    作者简介:

    陈星宇(1994—),男,工程师,博士,研究方向为桥梁结构抗风及车桥耦合振动等,E-mail:ysyfcxy@126.com

  • 中图分类号: U443.35

Effect Mechanism of Central Slot Width on Vortex-Induced Vibration Characteristics of Streamlined Box Girders

  • 摘要: 设置中央开槽的箱梁通常具有良好的颤振稳定性,但该类箱梁在大攻角来流作用下的涡振性能尚不明确. 采用数值模拟方法,针对某大跨度桥梁的流线型箱梁断面,分析了5种不同中央开槽宽度箱梁的流场特性和涡振稳定性能,探究了大攻角下中央开槽宽度变化对箱梁涡振性能的影响规律,并根据静态和动态流场的变化,系统讨论了相应的气动机理. 研究结果表明:在−10°~10° 风攻角范围内,封闭箱梁的阻力系数始终最小,而其升力系数绝对值则普遍大于开槽箱梁;中央开槽宽度(L)对箱梁涡振性能影响显著,箱梁涡振振幅随着开槽宽度的增大而减小,L/BB为箱梁宽度)由0变化至0.20,涡振振幅变化幅度达到40.9%;开槽宽度的变化会影响箱梁上表面大旋涡的运动以及箱梁中央区域来流分离程度,进而改变箱梁的涡振振幅.

     

  • 图 1  开槽箱梁断面示意

    Figure 1.  Sketch of slotted box girder section

    图 2  计算域及边界条件

    Figure 2.  Computational domain and boundary conditions

    图 3  不同开槽宽度箱梁的气动力系数

    Figure 3.  Aerodynamic coefficients of box girders with different slotted widths

    图 4  不同开槽宽度箱梁的压力云图

    Figure 4.  Pressure cloud charts of box girders with different slot widths

    图 5  不同开槽宽度箱梁槽内上下游壁面风压系数分布

    Figure 5.  Distribution of wind pressure coefficients on upstream and downstream walls of box girders with different slot widths

    图 6  不同开槽宽度箱梁的涡振振幅-风速变化曲线

    Figure 6.  VIV amplitudes versus the reduced wind velocity of box girders with different slot widths

    图 7  不同开槽宽度箱梁涡振稳定阶段不同时刻压力系数分布

    Figure 7.  Pressure coefficient distribution of box girders with different slot widths at different time in stable stage of VIV

    图 8  不同开槽宽度箱梁涡振稳定阶段不同时刻涡量等值线

    Figure 8.  Vortex contours of box girders with different slot widths at different time in stable stage of VIV

    表  1  不同开槽宽度箱梁的涡振响应

    Table  1.   VIV responses of box girders with different slot widths

    L/Bymax/D涡振振幅增长率/%f/HzSt
    00.1652.7040.087
    0.040.155 −5.92.6520.085
    0.080.133−19.22.7040.087
    0.120.117−28.92.8080.091
    0.200.098−40.92.8600.096
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出版历程
  • 收稿日期:  2019-05-31
  • 修回日期:  2019-09-20
  • 网络出版日期:  2019-12-11
  • 刊出日期:  2021-04-15

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