基于DIC方法研究混凝土劈裂的变形和破坏

任会兰 杜一宁 宋水舟

任会兰, 杜一宁, 宋水舟. 基于DIC方法研究混凝土劈裂的变形和破坏[J]. 高压物理学报, 2022, 36(4): 044104. doi: 10.11858/gywlxb.20220509
引用本文: 任会兰, 杜一宁, 宋水舟. 基于DIC方法研究混凝土劈裂的变形和破坏[J]. 高压物理学报, 2022, 36(4): 044104. doi: 10.11858/gywlxb.20220509
REN Huilan, DU Yining, SONG Shuizhou. Deformation and Failure of Concrete Splitting Based on DIC Method[J]. Chinese Journal of High Pressure Physics, 2022, 36(4): 044104. doi: 10.11858/gywlxb.20220509
Citation: REN Huilan, DU Yining, SONG Shuizhou. Deformation and Failure of Concrete Splitting Based on DIC Method[J]. Chinese Journal of High Pressure Physics, 2022, 36(4): 044104. doi: 10.11858/gywlxb.20220509

基于DIC方法研究混凝土劈裂的变形和破坏

doi: 10.11858/gywlxb.20220509
基金项目: 国家自然科学基金(12072028)
详细信息
    作者简介:

    任会兰(1973-),女,教授,主要从事冲击动力学研究. E-mail:huilanren@bit.edu.cn

    通讯作者:

    杜一宁(1997-),女,硕士研究生,主要从事冲击动力学研究. E-mail:1041142453@qq.com

  • 中图分类号: O521.3; O347

Deformation and Failure of Concrete Splitting Based on DIC Method

  • 摘要: 混凝土是一种典型的拉压不对称准脆性复合材料,采用巴西劈裂试验研究其拉伸破坏时发现,不同加载方式对混凝土的变形和破坏特征的影响很大。通过直接加载、弧形垫块加载以及平台圆盘加载3种方式对混凝土圆盘试件进行准静态试验,基于数字图像相关法,研究混凝土拉伸劈裂破坏过程中的全场变形和局域化破坏特征。结果表明:(1) 标准圆盘直接加载时,试件顶部和底部附近的应力集中使试件端部先发生损伤,拉伸应变场中的高幅值区从加载端向中心迅速扩展;而采用弧形垫块或平台圆盘加载优化了应力集中问题,使得试件中心最先出现应变集中,继续加载时损伤向两端扩展,导致试件劈裂破坏。(2) 弧形垫块加载和平台圆盘加载满足了巴西劈裂试验的中心起裂假设。测得平台圆盘加载时混凝土试件的抗拉强度约为5 MPa, 比标准圆盘加载提高了31.2%左右,分析认为平台圆盘加载提高了试件中心的压拉比以及加载端处的摩擦力。(3) 3种加载方式下,混凝土试件中心位置变形的数字图像相关分析结果和应变试验测量结果吻合较好,验证了基于数字图像相关方法获得的混凝土试件全场变形的有效性。

     

  • 图  试验系统示意图

    Figure  1.  Schematic of test system

    图  混凝土试件正面散斑(a)和反面应变片(b)

    Figure  2.  Concrete specimen with speckle on the front (a) and strain gauge on the back (b)

    图  标准圆盘的载荷-时间曲线

    Figure  3.  Load-time curve of standard disk

    图  标准圆盘的拉伸应变场演化

    Figure  4.  Evolution of tensile strain field of standard disk

    图  弧形垫块加载下标准圆盘的载荷-时间曲线

    Figure  5.  Load-time curves of standard disks between loading arcs

    图  弧形垫块加载下标准圆盘的拉伸应变场演化

    Figure  6.  Evolution of tensile strain field of standard disks between loading arcs

    图  平台圆盘载荷-时间曲线

    Figure  7.  Load-time curves of flattened disk

    图  平台圆盘拉伸应变场演化

    Figure  8.  Evolution of tensile strain field of flattened disk

    图  准静态劈裂试验得到的试样载荷-时间曲线

    Figure  9.  Load-time curves of specimen inquasi-static splitting test

    图  10  DIC结果与应变计测量结果的对比

    Figure  10.  Comparison between tensile strain determined from DIC analysis and that measured by strain gauges

    表  1  混凝土试件的配合比

    Table  1.   Mix proportion of concrete specimen

    MaterialProportion/(kg·m–3)
    Cement398.93
    Water195.00
    Fine aggregate632.12
    Coarse aggregate1173.95
    下载: 导出CSV

    表  2  3种圆盘加载试验得到的抗拉强度

    Table  2.   Tensile strength of three disc loading test

    No.Loading methodspc/kNTensile strength/MPaAverage tensile strength/MPa
    BD-01Standard disk
    direct loading
    31.8684.0583.836
    BD-0231.3743.995
    BD-0329.8063.795
    BD-0429.6223.772
    BD-0529.3823.741
    BD-0628.6883.653
    ArcBD-01Standard disk
    arc loading
    31.3423.8514.007
    ArcBD-0235.2334.328
    ArcBD-0330.6473.765
    ArcBD-0433.7884.151
    ArcBD-0532.2773.965
    ArcBD-0632.4163.982
    FBD-01Flattened disk loading40.4004.9145.031
    FBD-0238.2354.651
    FBD-0339.7534.836
    FBD-0444.4175.403
    FBD-0543.8545.334
    FBD-0641.5115.050
    下载: 导出CSV
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出版历程
  • 收稿日期:  2022-01-28
  • 修回日期:  2022-02-21
  • 录用日期:  2022-02-28
  • 网络出版日期:  2022-07-27
  • 刊出日期:  2022-07-28

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