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梯级GFRP筋混凝土受弯构件多塑性区形成机制

邓江东 杨思远 郭春泉

邓江东, 杨思远, 郭春泉. 梯级GFRP筋混凝土受弯构件多塑性区形成机制[J]. 复合材料学报, 2023, 40(11): 6324-6335. doi: 10.13801/j.cnki.fhclxb.20230214.001
引用本文: 邓江东, 杨思远, 郭春泉. 梯级GFRP筋混凝土受弯构件多塑性区形成机制[J]. 复合材料学报, 2023, 40(11): 6324-6335. doi: 10.13801/j.cnki.fhclxb.20230214.001
DENG Jiangdong, YANG Siyuan, GUO Chunquan. Formation mechanism of multi-plastic regions in concrete flexural members with graded GFRP bars[J]. Acta Materiae Compositae Sinica, 2023, 40(11): 6324-6335. doi: 10.13801/j.cnki.fhclxb.20230214.001
Citation: DENG Jiangdong, YANG Siyuan, GUO Chunquan. Formation mechanism of multi-plastic regions in concrete flexural members with graded GFRP bars[J]. Acta Materiae Compositae Sinica, 2023, 40(11): 6324-6335. doi: 10.13801/j.cnki.fhclxb.20230214.001

梯级GFRP筋混凝土受弯构件多塑性区形成机制

doi: 10.13801/j.cnki.fhclxb.20230214.001
基金项目: 国家自然科学基金(51978183)
详细信息
    通讯作者:

    邓江东,博士,研究员,研究方向为结构抗震 E-mail: jddeng@gzhu.edu.cn

  • 中图分类号: TU375.1;TB332

Formation mechanism of multi-plastic regions in concrete flexural members with graded GFRP bars

Funds: National Natural Science Foundation of China (51978183)
  • 摘要: 为提高混凝土受弯构件的抗震性能,采用玻璃纤维增强树脂复合材料(Glass fiber reinforced plastic,GFRP)筋和钢筋梯级配置的方案,构建同外力分布相适配的承载能力梯级分布,以形成多塑性区。本文设计了5个具有不同梯级配筋参数的混凝土受弯试件,对比参数包括梯级高度、配筋种类、配筋量和配筋方式等,通过推覆(Pushover)试验对比分析各试件中多塑性区的产生情况和力学效果,研究多塑性区的形成机制。结果表明:合理的梯级配筋方案可以在混凝土受弯构件中形成多个塑性区,塑性区的个数和发展程度会显著影响构件的抗震行为。多塑性区形成的决定条件是构件中多个梯级段所受外弯矩介于其屈服弯矩与极限弯矩之间。通过调整梯级段长度与配筋参数,可有效地调控各塑性区的发展程度及构件的破坏位置和破坏模式。线弹性的GFRP筋为截面提供了较大的抗弯承载力屈服后增量,是多塑性区形成和调控的关键。

     

  • 图  1  试件配筋详情

    Figure  1.  Reinforcement details of the specimen

    图  2  材料应力-应变实测曲线

    Figure  2.  Measured stress-strain curves of materials

    图  3  加载装置

    Figure  3.  Test setup

    图  4  梯级GFRP筋混凝土受弯试件的裂缝分布情况

    Figure  4.  Crack distribution of concrete flexural specimens with graded GFRP bars

    图  5  梯级GFRP筋混凝土受弯试件各梯级的塑性发展

    Figure  5.  Plastic development of concrete flexural Specimens with graded GFRP bars

    图  6  梯级GFRP筋混凝土受弯试件荷载-位移曲线

    Figure  6.  Load-displacement curves of concrete flexural specimens with graded GFRP bars

    图  7  梯级GFRP筋混凝土受弯试件多塑性区形成机制(曲率单位:10−4 mm−1,弯矩单位:kN·m)

    Figure  7.  Formation mechanism of multi-plastic regions of concrete flexural specimens with graded GFRP bars (Curvature unit: 10−4 mm−1, Moment unit: kN·m)

    图  8  梯级GFRP筋混凝土受弯试件截面的弯矩-应变关系

    Figure  8.  Bending moment-strain relationship of sections of concrete flexural specimens with graded GFRP bars

    Li—Bending moment-strain relationship of sections in different reinforcement conditions; L1—FRP bars; L2—FRP bars and steel bars; L3—Steel bars; My, $M_{\rm{u}}^i $—Yield and ultimate moment, respectively; εy, εu—Yield and ultimate strain, respectively

    表  1  各试件梯级配筋详细参数

    Table  1.   Parameters of each specimen's graded reinforcement

    SpecimenGradeLength of each
    grade/mm
    Details of reinforcementReinforcement ratio/%
    Steel barsGFRP bars
    A10-7004$\phi $16 steel bars + 4$ \phi $14 GFRP bars1.290.99
    2700-27004$ \phi $16 steel bars1.29
    B10-10004$ \phi $16 steel bars + 4$ \phi $14 GFRP bars1.290.99
    21000-27004$ \phi $16 steel bars1.29
    C10-5004$ \phi $16 steel bars + 10$ \phi $10 GFRP bars1.291.26
    2500-7604$ \phi $16 steel bars + 6$ \phi $10 GFRP bars1.290.75
    3760-27004$ \phi $16 steel bars1.29
    D10-6504$ \phi $14 GFRP bars + 10$ \phi $10 GFRP bars2.24
    2650-14004$ \phi $14 GFRP bars +6$ \phi $10 GFRP bars1.74
    31400-27004$ \phi $14 GFRP bars0.99
    E10-5004$ \phi $16 steel bars + 10$ \phi $10 GFRP bars + 3$ \phi $10 steel bars (embed)1.541.16
    2500-10004$ \phi $16 steel bars + 6$ \phi $10 GFRP bars + 1$ \phi $10 steel bars (embed)1.310.70
    31000-27004$ \phi $16 steel bars1.19
    Notes: GFRP—Glass fiber reinforced plastic; $\phi $—Diameter.
    下载: 导出CSV

    表  2  GFRP筋和钢筋的力学性能

    Table  2.   Mechanical properties of GFRP and steel bars

    TypeElastic
    modulus/GPa
    Strength/MPa
    YieldTensile
    $ \phi $14 GFRP bar 35.89520.93
    $ \phi $10 GFRP bar 30.92620.83
    $ \phi $16 steel bar202.95446.67614.42
    $ \phi $10 steel bar191.08471.19575.34
    下载: 导出CSV

    表  3  梯级GFRP筋混凝土受弯试件各梯级段的变形及试件破坏模式

    Table  3.   Deformation of each grade and failure mode of concrete flexural specimens with graded GFRP bars

    SpecimenGradeRotation/radTop displacement of
    the member produced by
    each grade/mm
    Plastic development
    degree of each grade
    Failure mode
    A10.0455 118.10Full developmentDuctile failure
    20.0472 83.90Ultimate failure
    B10.0396 100.50Ultimate failureGFRP bars fracture
    20.0097 9.50Undeveloped
    C10.0554 141.70Ultimate failureGFRP bars fracture
    20.0109 23.10Partial development
    30.0143 26.00Slight development
    D10.0598 149.25Ultimate failureGFRP bars fracture
    20.0400 67.77Partial development
    30.0613 33.00Full development
    E10.0477 120.50Partial developmentInterface debonding
    20.0464 83.90Ultimate failure
    30.0256 27.00Partial development
    下载: 导出CSV
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  • 收稿日期:  2022-11-24
  • 修回日期:  2023-01-04
  • 录用日期:  2023-01-18
  • 网络出版日期:  2023-02-16
  • 刊出日期:  2023-11-01

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