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基于耐久性理论和限载政策的某城市桥梁可靠性评估

黄海云 张俊平 吕金浩

黄海云, 张俊平, 吕金浩. 基于耐久性理论和限载政策的某城市桥梁可靠性评估[J]. 工程力学, 2022, 39(S): 58-63. doi: 10.6052/j.issn.1000-4750.2021.05.S009
引用本文: 黄海云, 张俊平, 吕金浩. 基于耐久性理论和限载政策的某城市桥梁可靠性评估[J]. 工程力学, 2022, 39(S): 58-63. doi: 10.6052/j.issn.1000-4750.2021.05.S009
HUANG Hai-yun, ZHANG Jun-ping, LÜ Jin-hao. RELIABILITY EVALUATION OF AN URBAN BRIDGE BASED ON DURABILITY THEORY AND LOAD LIMIT POLICY[J]. Engineering Mechanics, 2022, 39(S): 58-63. doi: 10.6052/j.issn.1000-4750.2021.05.S009
Citation: HUANG Hai-yun, ZHANG Jun-ping, LÜ Jin-hao. RELIABILITY EVALUATION OF AN URBAN BRIDGE BASED ON DURABILITY THEORY AND LOAD LIMIT POLICY[J]. Engineering Mechanics, 2022, 39(S): 58-63. doi: 10.6052/j.issn.1000-4750.2021.05.S009

基于耐久性理论和限载政策的某城市桥梁可靠性评估

doi: 10.6052/j.issn.1000-4750.2021.05.S009
基金项目: 国家自然科学基金项目(51278280);国家自然科学基金青年项目(51808148)
详细信息
    作者简介:

    张俊平(1968−),男,庆阳人,教授,博士,主要从事桥梁工程研究(E-mail: Zhang-jp@139.com)

    吕金浩(1993−),男,阜阳人,助工,硕士,主要从事土木建筑工程研究(E-mail: 289061006@qq.com)

    通讯作者:

    黄海云(1972−),女,广州人,副教授,硕士,主要从事桥梁工程研究(E-mail: 1500488039@qq.com)

  • 中图分类号: U441

RELIABILITY EVALUATION OF AN URBAN BRIDGE BASED ON DURABILITY THEORY AND LOAD LIMIT POLICY

  • 摘要: 城市桥梁在户外各种不利环境因素的影响下,结构材料的耐久性能会发生退化,以致出现混凝土强度降低、钢筋锈蚀等耐久性病害,导致桥梁结构的安全性和可靠性逐渐下降。以某典型城市高架桥为例,基于混凝土结构耐久性理论和城市的限载政策,结合现场检测、实地交通调查结果,分析了桥梁结构的时变抗力和荷载效应的变化规律,最后,推算了桥梁控制截面抗弯承载能力可靠性功能函数的失效概率,并对其可靠度进行了评估。该研究方法为各地城市桥梁的可靠性评估、维修养护、交通荷载限载政策等提供借鉴和参考。
  • 图  1  某典型桥梁的桥跨布置简图 (立面图/m,截面图/cm)

    Figure  1.  The layout drawing of a typical bridge span

    图  2  混凝土抗压强度均值的变化曲线

    Figure  2.  Variation of the mean compressive strength of the concrete

    图  3  钢筋面积局部锈蚀模型

    Figure  3.  Local corrosion model of the reinforcement area

    图  4  两控制截面抗弯承载力变化曲线

    Figure  4.  Variations of bending bearing capacity of two control sections

    图  5  剩余服役期可靠指标变化曲线

    Figure  5.  Variations of reliability index in remaining service period

    表  1  钢筋初始锈蚀时间的计算

    Table  1.   Calculation of the initial corrosion time of the reinforcement

    KkKcKmTi=15.2 Kk Kc Km
    1.451.200.6818.05
    下载: 导出CSV

    表  2  两控制截面抗弯承载能力的变化

    Table  2.   Changes of the bending bearing capacity of two control sections

    服役期/年承载力/(×104 kN∙m)变化率/(%)
    跨中支点跨中支点
    01.112−2.5590.00.0
    101.116−2.579−0.4−0.9
    181.113−2.573−0.3−0.8
    201.103−2.5480.1−0.6
    251.089−2.5160.80.4
    301.056−2.4372.01.7
    401.017−2.3465.04.8
    600.929−2.14012.412.2
    800.834−1.91820.720.6
    1001.112−2.55929.429.5
    下载: 导出CSV

    表  3  运营交通荷载车型分布占比

    Table  3.   Distribution proportion of operating traffic load types /(%)

    客/货车轴数类型时段
    限载非限载
    客车 二轴 85.4 52.8
    5.6 2.7
    8.1 5.1
    货车 二轴 11 0.3 1.2
    12 0.7 8.7
    三轴 112 0.0 4.0
    15 0.0 5.6
    四轴 115 0.0 7.4
    125 0.0 0.9
    五轴 129 0.0 3.9
    155 0.0 0.1
    六轴 1129 0.0 0.2
    159 0.0 7.6
    下载: 导出CSV

    表  4  车辆荷载效应GEV分布的拟合参数

    Table  4.   Fitting parameters for the vehicle load effect GEV distribution

    截面
    位置
    时段模型参数
    kσμ
    支点限载−0.1714522.111846.52
    非限载−0.23711601.005171.23
    跨中限载−0.0116283.20340.47
    非限载−0.2011940.681028.72
    下载: 导出CSV

    表  5  抗弯可靠指标的计算结果

    Table  5.   Calculation results of reliability index of bending resistance

    剩余服役期/年支点截面跨中截面
    限载非限载限载非限载
    06.92.97.34.9
    106.41.96.83.8
    206.21.26.53.4
    305.80.56.33.0
    405.5<0.06.02.5
    505.0<0.05.81.9
    604.4<0.05.41.4
    703.6<0.05.00.5
    802.4<0.04.5<0.0
    下载: 导出CSV
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出版历程
  • 收稿日期:  2021-05-30
  • 修回日期:  2022-01-27
  • 网络出版日期:  2022-02-26
  • 刊出日期:  2022-06-06

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