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CFRP布加固方案对RC梁剪切性能及尺寸效应影响分析

金浏 张江兴 李冬 杜修力

金浏, 张江兴, 李冬, 杜修力. CFRP布加固方案对RC梁剪切性能及尺寸效应影响分析[J]. 工程力学, 2022, 39(12): 31-40. doi: 10.6052/j.issn.1000-4750.2021.07.0558
引用本文: 金浏, 张江兴, 李冬, 杜修力. CFRP布加固方案对RC梁剪切性能及尺寸效应影响分析[J]. 工程力学, 2022, 39(12): 31-40. doi: 10.6052/j.issn.1000-4750.2021.07.0558
JIN Liu, ZHANG Jiang-xing, LI Dong, DU Xiu-li. ANALYSIS OF THE INFLUENCE OF CFRP SHEETS REINFORCEMENT SCHEME ON SHEAR PERFORMANCE AND SIZE EFFECT OF RC BEAMS[J]. Engineering Mechanics, 2022, 39(12): 31-40. doi: 10.6052/j.issn.1000-4750.2021.07.0558
Citation: JIN Liu, ZHANG Jiang-xing, LI Dong, DU Xiu-li. ANALYSIS OF THE INFLUENCE OF CFRP SHEETS REINFORCEMENT SCHEME ON SHEAR PERFORMANCE AND SIZE EFFECT OF RC BEAMS[J]. Engineering Mechanics, 2022, 39(12): 31-40. doi: 10.6052/j.issn.1000-4750.2021.07.0558

CFRP布加固方案对RC梁剪切性能及尺寸效应影响分析

doi: 10.6052/j.issn.1000-4750.2021.07.0558
基金项目: 国家自然科学基金项目(51822801);国家重点研发计划项目(2018YFC1504302)
详细信息
    作者简介:

    金 浏(1985−),男,江苏泗阳人,教授,博士,博导,主要从事混凝土结构防灾减灾研究工作(E-mail: jinliu@bjut.edu.cn)

    张江兴(1994−),男,河北石家庄人,博士生,主要从事混凝土结构尺寸效应方面研究(E-mail: zhangjiangxingbjut@163.com)

    李 冬(1988−),男,北京人,研究员,博士,博导,主要从事混凝土全局尺寸效应理论方面研究(E-mail: dong.li@bjut.edu.cn)

    通讯作者:

    杜修力(1962−),男,四川广安人,中国工程院院士,博士,博导,主要从事地震工程领域研究(E-mail: duxiuli@bjut.edu.cn)

  • 中图分类号: TU375.1

ANALYSIS OF THE INFLUENCE OF CFRP SHEETS REINFORCEMENT SCHEME ON SHEAR PERFORMANCE AND SIZE EFFECT OF RC BEAMS

  • 摘要: 采用同时考虑混凝土材料非均质性、钢筋与混凝土之间的相互作用以及CFRP布与混凝土之间的相互作用影响的三维细观数值模拟方法,建立了CFRP布加固RC梁剪切破坏力学分析模型。在验证了细观数值方法合理性的基础上,设计并建立了12根CFRP布加固RC梁细观模型,探究相同CFRP配纤率(用布量)前提下,不同CFRP布加固方案对单调荷载作用下RC梁的剪切性能及尺寸效应的影响。结果表明:CFRP布应变分布与裂缝位置紧密相关,越靠近裂缝位置的CFRP布应变越大,提供的抗剪贡献越多;在CFRP配纤率一致的前提下,CFRP布宽度大厚度小的加固方案优于CFRP布厚度大宽度小的加固方案;CFRP布U型加固RC梁剪切强度存在尺寸效应现象,但相同CFRP配纤率下,不同CFRP布加固方案对名义抗剪强度尺寸效应的影响较小,可以忽略。
  • 图  1  CFRP布加固RC梁三维细观数值分析模型示意图

    Figure  1.  3D meso-scale numerical analysis model of CFRP sheets strengthened RC beam

    图  2  钢筋-混凝土粘结滑移(τ-s)模型

    Figure  2.  The bond-slip relationship between rebars and concrete

    图  3  试验结果与模拟结果破坏模式对比图

    Figure  3.  Comparison of failure modes between the test results and simulation results

    图  4  试件试验结果与模拟结果荷载-位移曲线对比图

    Figure  4.  Comparison diagram of load-displacement curve between test results and simulation results

    图  5  CFRP布U型加固RC梁模型示意图

    Figure  5.  Schematic diagram of the model of CFRP sheets U-shaped strengthened RC beam

    图  6  CFRP布加固RC梁破坏模式图

    Figure  6.  Failure mode diagrams of CFRP sheets strengthened RC beams

    图  7  相同CFRP配纤率不同加固方案下梁的荷载-位移曲线

    Figure  7.  Load - displacement curves of beams under different reinforcement schemes with the same CFRP fiber ratio

    图  8  CFRP布的应变云图

    Figure  8.  Strain cloud diagram of CFRP sheets

    图  9  CFRP布应变分布图

    Figure  9.  CFRP sheets strain distribution diagram

    图  10  CFRP布加固RC梁名义抗剪强度趋势

    Figure  10.  Trend of nominal shear strength of RC beams strengthened with CFRP sheets

    图  11  CFRP布加固RC梁名义抗剪强度尺寸效应拟合

    Figure  11.  Size effect fittings on the nominal shear strength of RC beams strengthened with CFRP sheets

    表  1  模拟中所用钢筋力学参数

    Table  1.   Mechanical parameters of the steel bars

    材料纵筋箍筋
    型号HRB400HPB335
    直径d/mm286.5
    密度ρ/(kg/m3)78507850
    弹性模量E/GPa200200
    泊松比ν0.30.3
    屈服强度fy/MPa410325
    下载: 导出CSV

    表  2  模拟中混凝土细观组分力学参数

    Table  2.   Mechanical parameters of the concrete meso-components utilized in the simulations

    力学性质砂浆基质界面过渡区骨料颗粒
    弹性模量E/GPa*31.9#25.5*70.0
    泊松比ν*0.2#0.2*0.2
    剪胀角ψ/(°)1815
    断裂能Gc/(J/m2)5030
    抗压强度σc/MPa*40.0#29.6
    抗拉强度σt/MPa*3.0#2.3
    注:带“*”的数据在试验[30]中获取,带“#”的数据为重复试算参数,其他参数为默认值,断裂能值引用[32]。
    下载: 导出CSV

    表  3  CFRP布力学参数

    Table  3.   Mechanical parameters of CFRP sheets

    密度
    ρ/(kg/m³)
    弹性模量E/GPa泊松比ν抗拉强度σt/MPa厚度tf/mm
    20002350.335000.167
    下载: 导出CSV

    表  4  梁模型命名及对应的几何参数和CFRP布配置情况

    Table  4.   The model name of the beam, the corresponding geometric parameters and the CFRP sheets configuration

    试件名称截面尺寸
    b×h/mm
    CFRP布层数
    n/层
    CFRP布总厚度
    ntf/mm
    CFRP布宽度
    Wf/mm
    CFRP布宽厚比
    Wf/ntf
    CFRP布间距
    Sf/mm
    CFRP配纤率
    ρf/(%)
    S-I150 × 30010.1671207201300.2
    S-II20.33460180
    S-III30.5014080
    S-IV61.0022020
    M-I300 × 60020.334240720260
    M-II40.668120180
    M-III61.0028080
    M-IV122.0044020
    L-I450 × 90030.501360720390
    L-II61.002180180
    L-III91.50312080
    L-IV183.0066020
    下载: 导出CSV

    表  5  不同加固方案对应的V0D0

    Table  5.   Parameters of V0 and D0 under different CFRP reinforcement schemes

    配纤率 ρf/(%)加固方案V0D0
    0.2I2.591663.190
    II2.543676.411
    III2.480698.683
    IV2.434712.644
    下载: 导出CSV
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  • 收稿日期:  2021-07-20
  • 录用日期:  2022-01-20
  • 修回日期:  2021-12-22
  • 网络出版日期:  2022-01-17
  • 刊出日期:  2022-12-01

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