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带钢底板UHPC梁抗剪承载力计算方法

晏班夫 刘千 王凯 涂兵 柯璐

晏班夫, 刘千, 王凯, 涂兵, 柯璐. 带钢底板UHPC梁抗剪承载力计算方法[J]. 交通运输工程学报, 2024, 24(3): 82-93. doi: 10.19818/j.cnki.1671-1637.2024.03.005
引用本文: 晏班夫, 刘千, 王凯, 涂兵, 柯璐. 带钢底板UHPC梁抗剪承载力计算方法[J]. 交通运输工程学报, 2024, 24(3): 82-93. doi: 10.19818/j.cnki.1671-1637.2024.03.005
YAN Ban-fu, LIU Qian, WANG Kai, TU Bing, KE Lu. Shear bearing capacity calculation method for UHPC beams with steel bottom plate[J]. Journal of Traffic and Transportation Engineering, 2024, 24(3): 82-93. doi: 10.19818/j.cnki.1671-1637.2024.03.005
Citation: YAN Ban-fu, LIU Qian, WANG Kai, TU Bing, KE Lu. Shear bearing capacity calculation method for UHPC beams with steel bottom plate[J]. Journal of Traffic and Transportation Engineering, 2024, 24(3): 82-93. doi: 10.19818/j.cnki.1671-1637.2024.03.005

带钢底板UHPC梁抗剪承载力计算方法

doi: 10.19818/j.cnki.1671-1637.2024.03.005
基金项目: 

国家自然科学基金项目 U23A20662

国家自然科学基金项目 52208307

广西科技计划项目 AB23026154

详细信息
    作者简介:

    晏班夫(1972-),男,湖南冷水江人,广西大学教授,工学博士,从事UHPC桥梁新结构设计理论与工程实践研究

  • 中图分类号: U445.7

Shear bearing capacity calculation method for UHPC beams with steel bottom plate

Funds: 

National Natural Science Foundation of China U23A20662

National Natural Science Foundation of China 52208307

Scientific and Technological Plan Project of Guangxi Province AB23026154

More Information
  • 摘要: 为研究带钢底板的超高性能混凝土(UHPC)梁的抗剪性能和抗剪承载力计算方法,采用试验研究与理论分析的方法,设计制作了7片试验梁开展抗剪试验,试验参数包括接缝配置、纵向腹筋设置和剪跨比;结合极限平衡理论和分项线性叠加思想,建立了考虑箍筋、钢纤维、UHPC基体及钢板抗剪贡献的带钢底板UHPC梁抗剪承载力计算建议公式,并与法国规范计算公式进行比较。试验结果表明:接缝梁的破坏形态均为接缝处错位的剪切破坏,主裂缝沿靠近跨中的接缝一侧斜向发展,而完整梁的破坏形态与剪跨比有关,随着剪跨比的增加从剪压破坏向弯剪破坏转变;接缝的存在会降低带钢底板UHPC梁的抗剪承载力,且随剪跨比的增大而减小,设置纵向腹筋则可有效提高其抗剪承载力与变形能力;采用本文提出的计算方法的抗剪承载力计算值与试验值的平均比值为0.91,变异系数为0.16,采用法国规范抗剪承载力计算方法的抗剪承载力计算值与试验值的平均比值为1.08,变异系数为0.29,因此本文提出的计算方法离散性较小,可适用于带钢底板UHPC梁的抗剪承载力计算。

     

  • 图  1  试验梁构造尺寸(单位:cm)

    Figure  1.  Structural sizes of test beams (unit: cm)

    图  2  试验加载装置

    Figure  2.  Test loading device

    图  3  测点布置

    Figure  3.  Layouts of measuring points

    图  4  试验梁破坏形态

    Figure  4.  Failure modes of test beams

    图  5  DIC测试结果

    Figure  5.  Test results of DIC

    图  6  荷载-挠度曲线

    Figure  6.  Load-deflection curves

    图  7  荷载-箍筋应变曲线

    Figure  7.  Load-stirrup strain curves

    图  8  钢板荷载-应变曲线

    Figure  8.  Load-strain curves of steel plate

    图  9  钢纤维作用

    Figure  9.  Effects of steel fiber

    图  10  计算图示

    Figure  10.  Calculation illustration

    表  1  试验梁参数

    Table  1.   Parameters of test beams

    梁号 L/m l/m λ ρ/% ρv /% s/mm 钢筋布置
    纵筋 跨中加强钢筋 箍筋 腰筋
    S1 3.8 0.2 3.2 1.14 0.897 75 4C16 2C16 C8 6C10
    S2 3.1 0.2 2.4 1.14 0.897 75 4C16 2C16 C8 6C10
    S3 2.0 0.1 1.4 1.14 0.897 75 4C16 2C16 C8 6C10
    B 3.1 0.2 2.4 1.14 0.897 75 4C16 2C16 C8
    C1 3.8 0.2 3.2 1.14 0.897 75 4C16 6C16 C8 6C10
    C2 3.1 0.2 2.4 1.14 0.897 75 4C16 2C16 C8 6C10
    C3 2.0 0.1 1.4 1.14 0.897 75 4C16 2C16 C8 6C10
    下载: 导出CSV

    表  2  UHPC材料力学性能

    Table  2.   Material mechanical performances of UHPC

    材料类型 立方体抗压强度/MPa 抗折强度/MPa 弹性模量/GPa
    UHPC150 161.1 21.1 47.14
    下载: 导出CSV

    表  3  钢筋力学性能

    Table  3.   Mechanical performances of reinforcement

    钢筋类型 屈服强度/MPa 弹性模量/GPa 延伸率/%
    HRB400 475.6 200 24.5
    下载: 导出CSV

    表  4  试验梁极限荷载与破坏形态

    Table  4.   Ultimate loads and failure modes of test beams

    梁号 Pu/kN Pr/kN μ θ/(°) 破坏模式
    S1 1 184 345 1.41 45 剪错
    S2 1 246 296 1.23 45 剪错
    S3 1 344 336 1.07 45 剪错
    B 1 066 131 1.19 45 剪错
    C1 1 467 237 1.28 50 弯剪
    C2 1 668 224 1.33 57 剪压
    C3 1 735 365 1.07 62 剪压
    下载: 导出CSV

    表  5  抗剪承载力计算值与试验值

    Table  5.   Calculation values and test values of shear bearing capacity

    梁号 Vv/kN Vw/kN Vc/kN Vl/kN Vu/kN Ve/kN Vu/Ve VF/kN VF/Ve
    S1 224.7 85.7 115.8 78.0 504.2 592.0 0.85 608.1 1.03
    S2 224.7 85.7 151.1 78.0 539.5 623.0 0.87 608.1 0.98
    S3 224.7 85.7 244.3 78.0 632.7 672.0 0.94 608.1 0.90
    B 224.7 85.7 151.1 78.0 539.5 533.0 1.01 608.1 1.14
    C1 299.6 189.5 115.8 78.0 682.9 733.5 0.93 954.3 1.30
    C2 299.6 189.5 151.1 78.0 718.2 834.0 0.86 954.3 1.14
    C3 299.6 189.5 244.3 78.0 811.4 867.5 0.94 954.3 1.10
    下载: 导出CSV
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  • 收稿日期:  2024-01-06
  • 网络出版日期:  2024-07-18
  • 刊出日期:  2024-06-30

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