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正交异性钢桥面构造细节的日照温度次应力分析

祝志文 桂飘 滕华俊 FedericoAccornero

祝志文, 桂飘, 滕华俊, FedericoAccornero. 正交异性钢桥面构造细节的日照温度次应力分析[J]. 工程力学, 2022, 39(8): 158-171. doi: 10.6052/j.issn.1000-4750.2021.04.0313
引用本文: 祝志文, 桂飘, 滕华俊, FedericoAccornero. 正交异性钢桥面构造细节的日照温度次应力分析[J]. 工程力学, 2022, 39(8): 158-171. doi: 10.6052/j.issn.1000-4750.2021.04.0313
ZHU Zhi-wen, GUI Piao, TENG Hua-jun, Federico Accornero. THE SECONDARY STRESS AT THE DETAILS OF ORTHOTROPIC BRIDGE DECKS INDUCED BY THERMAL GRADIENT UNDER SOLAR RADIATION[J]. Engineering Mechanics, 2022, 39(8): 158-171. doi: 10.6052/j.issn.1000-4750.2021.04.0313
Citation: ZHU Zhi-wen, GUI Piao, TENG Hua-jun, Federico Accornero. THE SECONDARY STRESS AT THE DETAILS OF ORTHOTROPIC BRIDGE DECKS INDUCED BY THERMAL GRADIENT UNDER SOLAR RADIATION[J]. Engineering Mechanics, 2022, 39(8): 158-171. doi: 10.6052/j.issn.1000-4750.2021.04.0313

正交异性钢桥面构造细节的日照温度次应力分析

doi: 10.6052/j.issn.1000-4750.2021.04.0313
基金项目: 国家自然科学基金项目(51878269)
详细信息
    作者简介:

    桂 飘(1998−),女,重庆人,硕士生,主要从事钢结构桥梁研究(E-mail: 19pgui@stu.edu.cn)

    滕华俊(1996−),男,山东人,硕士,主要从事钢结构桥梁研究(E-mail: 913170272@qq.com)

    Federico Accornero (1983−),男,意大利人,博士,主要从事疲劳和断裂研究(E-mail: federico.accornero@polito.it)

    通讯作者:

    祝志文(1968−),男,湖南人,教授,博士,博导,主要从事钢结构桥梁研究(E-mail: zhuzw@stu.edu.cn)

  • 中图分类号: U445.71

THE SECONDARY STRESS AT THE DETAILS OF ORTHOTROPIC BRIDGE DECKS INDUCED BY THERMAL GRADIENT UNDER SOLAR RADIATION

  • 摘要: 为研究正交异性钢桥面板构造细节的日照温度次应力行为,多次在高温和强日照天气下现场实测了某自锚式悬索桥钢箱梁外周和实腹式横隔板上温度场,基于观测到的最大顶底板温差拟合了横隔板竖向温度梯度表达式;在ANSYS中建立了钢箱梁节段有限元模型并施加外周温度,计算其24 h温度场,并与横隔板实测竖向温度的对比校验了温度场模拟的合理性;开展了钢箱梁节段和子模型的精细化热应力分析,得到了纵肋−横隔板和弧形切口共4个构造细节的温度应力时程曲线。研究表明:在强太阳辐射和高温环境下,钢箱梁横向温差不明显,但存在明显的竖向温度梯度,横隔板竖向温度梯度可拟合为四折线形式,最大温差明显小于欧规值。正交异性钢桥面板产生热变形并在构造细节处产生明显热应力集中,特别是弧形切口热应力大。仅日照竖向温度梯度作用,或仅桥面货车通行加载,弧形切口均为无限疲劳寿命;但二者共同作用产生的应力幅,大于构造细节的常幅疲劳极限,可能是该构造细节出现疲劳开裂的原因。
  • 图  1  某大桥内横隔板弧形切口的长疲劳裂纹

    Figure  1.  Long fatigue crack at floor beam cutout detail observed in a bridge

    图  2  桥梁立面布置图 /m

    Figure  2.  Elevation layout of bridge

    图  3  钢箱梁横断面及测点布置 /mm

    Figure  3.  Cross section of steel box girder and layout of measuring points

    图  4  正交异性钢桥面布置 /mm

    Figure  4.  Layout of OSD

    图  5  温度测点布置和测温仪 /mm

    Figure  5.  Layout of measuring points and temperature-measuring device

    图  6  顶板不同时刻横向温度及其变化

    Figure  6.  Transverse temperature on roof and its variation with time

    图  7  底板不同时刻横向温度及变化

    Figure  7.  Transverse temperature on floor and its variation with time

    图  8  三个断面相同高度测点温度变化

    Figure  8.  Temperature variation of measuring points along three sections with same height

    图  9  工况1截面 B 实测24 h温度和温差

    Figure  9.  Condition 1 Measured 24 h temperature and its gradient on section B

    图  10  工况2截面 A 实测24 h温度和温差

    Figure  10.  Measured 24 h temperature and its gradient on Section A of Case 2

    图  11  工况1温差曲线和竖向温度梯度拟合曲线

    Figure  11.  Condition 1 Temperature difference curve and fitted curve of vertical thermal gradient

    图  12  有限元模型

    Figure  12.  Finite element model

    图  13  节段模型14:00温度云图

    Figure  13.  Temperature contour plot of sectional model at 14:00

    图  14  不同时刻有限元与实测温度结果的对比

    Figure  14.  FEA results in comparison with measured results at different moments

    图  15  正交异性钢桥面子模型

    Figure  15.  Sub-model of OSD

    图  16  网格划分

    Figure  16.  Mesh arrangement

    图  17  构造细节位置及应力方向

    Figure  17.  Location and stress direction of details

    图  18  4个构造细节的热应力和竖向温差在24 h内变化

    Figure  18.  Thermal stress variation at four details and vertical temperature difference during 24 h

    图  19  RF-R细节应力云图 /MPa

    Figure  19.  Stress contours at RF detail

    图  20  OSD变形 /mm

    Figure  20.  Deformation of OSD

    图  21  弧形切口构造细节应力云图 /MPa

    Figure  21.  Stress contours around cutout detail

    图  22  弧形切口第一主应力方向

    Figure  22.  Direction of first principal stress around cutout detail

    图  23  钢箱梁节段模型 /m

    Figure  23.  Segmental model of steel box girder

    图  24  纵肋-横隔板连接和弧形切口周围网格

    Figure  24.  Mesh around rib-to-floor beam connection and cutout detail

    图  25  弧形切口构造细节应力随轮载纵桥向的变化

    Figure  25.  Stress at cutout detail versus wheel location in bridge longitudinal direction

    图  26  弧形切口Mises应力云图

    Figure  26.  Mises stress contour at cutout detail

    表  1  热效应分析参数

    Table  1.   Parameters used in analysis of thermal effects

    参数材料密度
    ρ/(kg/m3)
    比热容
    C/(J/(KG·℃)
    导热系数
    k/(W/(m·℃))
    材料弹性模量
    E/MPa
    泊松比ν
    取值785046060.5206 0000.3
    下载: 导出CSV

    表  2  钢箱梁内温度

    Table  2.   Temperature in steel box girder

    时刻0:002:006:008:0010:0012:0014:0016:0018:0020:0022:00
    箱内
    温度/(℃)
    37.335.232.632.034.635.836.238.841.340.839.9
    下载: 导出CSV

    表  3  4个构造细节热应力幅值

    Table  3.   Thermal stress range at four details

    构造细节 应力最大值/MPa 应力最小值/MPa 应力幅计算值/MPa
    RF-F −4.6 −13.6 9.0
    RF-R −14.6 −40.6 26.0
    RF-W −5.9 −17.7 11.8
    Cutout 39.2 1.5 37.6
    下载: 导出CSV
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出版历程
  • 收稿日期:  2021-04-25
  • 录用日期:  2021-11-26
  • 修回日期:  2021-09-17
  • 网络出版日期:  2021-11-26
  • 刊出日期:  2022-08-01

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