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考虑冲刷效应的大跨桥梁地震-风-车-桥耦合振动分析

王亚伟 朱金 郑凯锋 苏永华 郭辉 李永乐

王亚伟, 朱金, 郑凯锋, 苏永华, 郭辉, 李永乐. 考虑冲刷效应的大跨桥梁地震-风-车-桥耦合振动分析[J]. 西南交通大学学报, 2024, 59(2): 323-331. doi: 10.3969/j.issn.0258-2724.20220091
引用本文: 王亚伟, 朱金, 郑凯锋, 苏永华, 郭辉, 李永乐. 考虑冲刷效应的大跨桥梁地震-风-车-桥耦合振动分析[J]. 西南交通大学学报, 2024, 59(2): 323-331. doi: 10.3969/j.issn.0258-2724.20220091
WANG Yawei, ZHU Jin, ZHENG Kaifeng, SU Yonghua, GUO Hui, LI Yongle. Coupled Vibration Analysis of Earthquake-Wind-Vehicle-Bridge for Long-Span Bridges Considering Scouring Effect[J]. Journal of Southwest Jiaotong University, 2024, 59(2): 323-331. doi: 10.3969/j.issn.0258-2724.20220091
Citation: WANG Yawei, ZHU Jin, ZHENG Kaifeng, SU Yonghua, GUO Hui, LI Yongle. Coupled Vibration Analysis of Earthquake-Wind-Vehicle-Bridge for Long-Span Bridges Considering Scouring Effect[J]. Journal of Southwest Jiaotong University, 2024, 59(2): 323-331. doi: 10.3969/j.issn.0258-2724.20220091

考虑冲刷效应的大跨桥梁地震-风-车-桥耦合振动分析

doi: 10.3969/j.issn.0258-2724.20220091
基金项目: 国家自然科学基金(51908472);中国博士后科学基金(2019TQ0271, 2019M663554);四川省科学技术厅科技计划项目(2020YJ080)
详细信息
    作者简介:

    王亚伟(1991—),男,助理研究员,博士,研究方向为桥梁多动力,E-mail:hbuwyw1991@sina.com

    通讯作者:

    朱金(1988—),男,副教授,博士,研究方向为风-车-桥耦合振动,桥梁多动力,E-mail:zhujin19880102@126.com

  • 中图分类号: U447

Coupled Vibration Analysis of Earthquake-Wind-Vehicle-Bridge for Long-Span Bridges Considering Scouring Effect

  • 摘要:

    为研究冲刷效应对地震与风联合作用下大跨桥梁动力响应的影响,在已建立的地震-风-车-桥耦合振动分析模型基础上,利用p-y曲线(p为土阻力,y为变形)折减法考虑不同冲刷深度的桩土荷载-位移关系,根据桩土荷载-位移关系和冲刷深度更新桩基的侧向支撑刚度和长度,从而考虑了冲刷效应对大跨桥梁动力响应的影响,并将模型应用到江顺大桥冲刷效应的分析研究中. 研究结果表明:基础冲刷减弱了地基土对结构的侧向约束,从而降低结构的自振频率,侧向振型的自振频率最大降低6.01%;在运营车辆和风荷载作用下,基础冲刷对结构的振动响应影响很小;在地震发生后,基础冲刷会增大结构的横向振动,结构的横向位移响应极值最大增大9.1%,横向位移响应谱也相应增大,而对结构的竖向振动影响很小;基础冲刷可能减小车辆横向加速度的响应,车辆的横向加速度响应极值最大降低7.7%,对车辆的竖向振动影响很小.

     

  • 图 1  斜拉桥模型(单位:m)

    Figure 1.  Prototype of cable-stayed bridge (unit: m)

    图 2  带有群桩基础的桥塔模型(单位:m)

    Figure 2.  Prototype of bridge tower with group-pile foundation (unit: m)

    图 3  模拟示意

    Figure 3.  Simulation

    图 4  桥址处桩土的p-y曲线

    Figure 4.  p-y curves of soil for piles at bridge site

    图 5  主梁跨中的u(t)时程和w(t)时程

    Figure 5.  Horizontal turbulent wind velocity time history and vertical turbulent wind velocity time history at bridge mid-span

    图 6  桥梁支撑点N1、N3和N5位置处水平方向的地震动加速度时程

    Figure 6.  Seismic acceleration time histories of support points N1, N3, and N5 along horizontal direction

    图 7  地震和运营荷载作用下主梁跨中的位移响应

    Figure 7.  Displacement responses at bridge mid-span under and seismic and operational loads

    图 8  地震和运营荷载作用下主梁跨中的位移响应谱

    Figure 8.  Displacement response spectrum at bridge mid-span under seismic and operational loads

    图 9  地震和运营荷载作用下左桥塔顶的横向位移响应

    Figure 9.  Lateral displacement responses at left tower top under seismic and operational loads

    图 10  地震和运营荷载作用下左桥塔顶的横向位移响应谱

    Figure 10.  Lateral displacement response spectrum at left tower top under seismic and operational loads

    图 11  地震和运营荷载作用下代表车辆的加速度响应

    Figure 11.  Acceleration responses of representative vehicle under seismic and operational loads

    表  1  桥梁结构的前十阶自振频率和振型

    Table  1.   First 10 natural vibration frequencies and modes of bridge

    振型数自振频率/Hz振型
    10.0905纵飘(主梁)
    20.20291 阶对称侧弯(主梁、桥塔)
    30.25721 阶反对称侧弯(主梁、桥塔)
    40.29172 阶对称侧弯(主梁、桥塔)
    50.29441 阶对称竖弯(主梁)
    60.33311 阶反对称竖弯(主梁)
    70.34502 阶对称竖弯(主梁)
    80.38902 阶反对称竖弯(主梁)
    90.41382 阶反对称侧弯(主梁、桥塔)
    100.42741 阶对称扭转(主梁)
    下载: 导出CSV

    表  2  群桩基础处不同土层的物理和力学参数

    Table  2.   Physical and mechanical properties of different soil layers at group-pile foundation

    土层 地基土
    的类别
    土层
    厚度/m
    重度/
    (kN·m−3
    排水剪切
    强度/kPa
    内摩擦
    角/(°)
    泊松比 弹性模量/
    MPa
    单轴抗压
    强度/MPa
    最大主应力为50% 的应变 应变
    因子
    1 无黏性
    砂土
    7.5 18 30 0.30 3
    2 黏性土 10.0 20 93.8 0.35 21 0.007
    3 软岩 29.5 22 0.25 7240 3.45 0.0005
    下载: 导出CSV

    表  3  不同冲刷深度时桥梁的自振频率

    Table  3.   Natural frequencies of the bridge under various scour depths Hz

    振型序号冲刷深度
    05 m10 m15 m20 m
    10.09050.09030.09020.09010.0894
    20.20290.19940.19870.19840.1907
    30.25720.25310.25230.25200.2428
    40.29170.29120.29110.29100.2835
    50.29440.29330.29280.29260.2899
    60.33310.32610.32400.32290.2988
    70.34500.33660.33420.33310.3138
    80.38900.38600.38520.38480.3796
    90.41380.40700.40580.40530.3864
    100.42740.41790.41520.41390.3907
    下载: 导出CSV
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出版历程
  • 收稿日期:  2022-02-02
  • 修回日期:  2022-04-25
  • 网络出版日期:  2023-09-06
  • 刊出日期:  2022-05-23

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