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低次数疲劳加载下短切钢纤维对碳纤维织物增强混凝土力学性能的影响

朱德举 唐昊

朱德举, 唐昊. 低次数疲劳加载下短切钢纤维对碳纤维织物增强混凝土力学性能的影响[J]. 复合材料学报, 2023, 40(11): 6260-6274. doi: 10.13801/j.cnki.fhclxb.20230222.002
引用本文: 朱德举, 唐昊. 低次数疲劳加载下短切钢纤维对碳纤维织物增强混凝土力学性能的影响[J]. 复合材料学报, 2023, 40(11): 6260-6274. doi: 10.13801/j.cnki.fhclxb.20230222.002
ZHU Deju, TANG Hao. Influence of short steel fiber on mechanical properties of carbon textile reinforced concrete under low-cycle fatigue loading[J]. Acta Materiae Compositae Sinica, 2023, 40(11): 6260-6274. doi: 10.13801/j.cnki.fhclxb.20230222.002
Citation: ZHU Deju, TANG Hao. Influence of short steel fiber on mechanical properties of carbon textile reinforced concrete under low-cycle fatigue loading[J]. Acta Materiae Compositae Sinica, 2023, 40(11): 6260-6274. doi: 10.13801/j.cnki.fhclxb.20230222.002

低次数疲劳加载下短切钢纤维对碳纤维织物增强混凝土力学性能的影响

doi: 10.13801/j.cnki.fhclxb.20230222.002
基金项目: 国家自然科学基金山东联合基金项目(U1806225)
详细信息
    通讯作者:

    朱德举,博士,教授,博士生导师,研究方向为高性能纤维/织物增强水泥基和树脂基复合材料、高耐久纤维复材筋增强海水海砂混凝土材料及结构 、生物材料多尺度力学行为及仿生 E-mail: dzhu@hnu.edu.cn

  • 中图分类号: TB332;TU599

Influence of short steel fiber on mechanical properties of carbon textile reinforced concrete under low-cycle fatigue loading

Funds: National Natural Science Foundation of China-Shandong Joint Fund (U1806225)
  • 摘要: 为了研究低次数疲劳加载下短切钢纤维对碳纤维织物增强混凝土(C-TRC)力学性能的影响,通过万能试验机对不同短切钢纤维掺量(0vol%、0.5vol%、1.0vol%)的试件进行低次数疲劳加载实验和疲劳加载前后的准静态拉伸试验,并结合数字图像相关分析得到拉伸状态下裂纹与应变分布。结果表明:添加短切钢纤维能够增大C-TRC的拉伸强度、杨氏模量和韧性,降低试件的能量耗散及剩余累积应变,增加裂纹条数和裂纹宽度。疲劳荷载能够降低C-TRC的刚度、极限强度、峰值应变及韧性,加快C-TRC的破坏。添加短切纤维能够降低疲劳加载造成的性能损耗,且0.5vol%掺量的增强效果最佳。基于现有的剩余强度-剩余刚度关联模型和实验数据,改进了强度退化模型,对实验数据进行拟合并与现有模型进行对比,其结果与实验数据吻合更好。该成果对于织物增强混凝土(TRC)疲劳性能的评价具有指导意义。

     

  • 图  1  碳纤维织物

    Figure  1.  Carbon textile

    图  2  短切钢纤维

    Figure  2.  Short steel fiber

    图  3  碳纤维织物混凝土(C-TRC)拉伸试件

    Figure  3.  Tensile specimen of carbon textile reinforced concrete (C-TRC)

    图  4  球铰连接的拉伸夹具

    Figure  4.  Tensile fixtures connected by ball joint

    图  5  疲劳荷载谱

    Smax and Smin—Maximum and minimun fatigue stress; σmax—Determined failure stress from the monotonous tensile tests; Sm—Average fatigue stress; Sa—Stress amplitude; T—Cycle period

    Figure  5.  Fatigue load spectrum

    图  6  低次数疲劳加载作用下C-TRC拉伸应力-应变曲线

    N—Cycle index; E+ and E—Upward Young's modulus and downward Young's modulus; σsmin and σsmax—Minimum and maximum stress in a single cycle; εsmin—Minimum strain in a single cycle; Bi—Minimum stress point in the ith cycle; Ai and Ai+1—Maximum stress point in the ith and (i+1)th cycle; εsmax_1 and εsmax_2—Maximum strain in the ith and (i+1)th cycle

    Figure  6.  Tensile stress-strain curves of C-TRC subjected to low-cycle fatigue loading

    图  7  低次数疲劳加载作用下C-TRC疲劳力学性能变化

    Ediss—Dissipated energy

    Figure  7.  Variations in fatigue mechanical properties of C-TRC subjected to low-cycle fatigue loading

    图  8  低次数疲劳加载作用下C-TRC主裂纹宽度变化

    Figure  8.  Variations in width of the major crack of C-TRC subjected to low-cycle fatigue loading

    图  9  短切钢纤维掺量对C-TRC裂纹宽度影响(第100次循环)

    Figure  9.  Influence of short steel fiber contents on crack width of C-TRC (100th cycle)

    图  10  C-TRC裂纹宽度对比(第100次循环)

    Figure  10.  Comparison of the crack width of C-TRC (100th cycle)

    图  11  低次数疲劳加载作用下C-TRC裂纹宽度的Mann-Kendall检验对比

    ZMK—Test statistic of Mann-Kendall' test; Zα/2(α=0.025)—Test statistic at the significance level of 0.5

    Figure  11.  Comparison of the Mann-Kendall' test results of the crack width of C-TRC subjected to low-cycle fatigue loading

    图  12  短切钢纤维掺量对C-TRC疲劳性能的影响(第100次循环)

    Figure  12.  Influence of short steel fiber contents on fatigue properties of C-TRC (100th cycle)

    图  13  C-TRC拉伸应力-应变曲线

    σT and σu—Cracking stress and peak stress; εT and εu—Cracking strain and peak strain; E—Elastic modulus

    Figure  13.  Tensile stress-strain curves of C-TRC

    图  14  疲劳加载前后C-TRC的拉伸力学性能对比

    Figure  14.  Comparison of the tensile mechanical properties of C-TRC before and after fatigue loading

    图  15  C-TRC剩余强度和剩余刚度的理论与试验结果对比

    Sr and Er—Residual strength and residual rigidity; S0 and E0—Initial strength and initial rigidity

    Figure  15.  Comparison of theoretical and experimental results of the residual strength and residual rigidity of C-TRC

    图  16  不同短切钢纤维掺量的C-TRC裂纹和应变分布

    Figure  16.  Crack and strain distribution of C-TRC with various contents of short steel fiber

    图  17  C-TRC典型破坏形态

    Figure  17.  Typical failure modes of C-TRC

    图  18  不同短切钢纤维掺量的C-TRC疲劳加载前后的裂纹数量和平均裂纹间距

    Figure  18.  Crack number and average crack spacing of C-TRC with various contents of short steel fiber before and after fatigue loading

    图  19  疲劳加载后C-TRC的破坏形态

    Figure  19.  Failure patterns of C-TRC after fatigue loading

    表  1  基体配合比设计

    Table  1.   Mix design of the matrix kg/m3

    Cement
    (P·O 42.5)
    Fly ashSilica fumeSand (0-0.6 mm)Sand (0.6-1.2 mm)SuperplasticizerWaterDefoamer
    712303654509014.43302.6
    下载: 导出CSV

    表  3  短切钢纤维的物理和力学性能参数

    Table  3.   Physical and mechanical parameters of short steel fiber

    Diameter/mmLength/
    mm
    Tensile strength
    /MPa
    Young's modulus
    /GPa
    Density
    /
    (g·cm−3)
    0.206-830152007.8
    下载: 导出CSV

    表  2  碳纤维织物的物理和力学性能参数

    Table  2.   Physical and mechanical parameters of carbon textile

    ModelTextile
    size/mm2
    Tex/
    (g·(1000 m)−1)
    Grammage/
    (g·cm−2)
    CoatingSection area of
    single yarn/mm2
    Tensile strength of
    single yarn/MPa
    Young's modulus of
    single yarn/GPa
    WarpWeftWarpWeftWarpWeft
    TC33-3 K5×5 270-3201.8Epoxy resin0.180.1634503100238216
    下载: 导出CSV

    表  4  C-TRC拉伸实验设计

    Table  4.   Experimental design for tensile tests of C-TRC

    SpecimenTextileLayers of textile${V_{\text{f}}}$/vol%
    Q0%CT/CCarbon20
    Q0.5%CT/CCarbon20.5
    Q1.0%CT/CCarbon21
    Notes: Q—Quasi-static tensile tests; 0%, 0.5%, 1.0%—Contents of short steel fiber are 0vol%, 0.5vol% and 1.0vol%; CT—Carbon textile; C—Concrete; ${V_{\text{f}}}$—Volume fraction of carbon textile.
    下载: 导出CSV

    表  5  C-TRC低次数疲劳加载试验设计

    Table  5.   Experimental design for low-cycle fatigue loading tests of C-TRC

    SpecimenTextileLayers of textileVf/vol%CycleStress level/%
    L0%CT/CCarbon201005-60
    L0.5%CT/CCarbon20.51005-60
    L1.0%CT/CCarbon211005-60
    Note: L—Low-cycle fatigue loading test.
    下载: 导出CSV

    表  6  不同短切钢纤维掺量的C-TRC的疲劳性能参数(第100次循环)

    Table  6.   Fatigue properties parameters of C-TRC with various contents of short steel fiber (100th cycle)

    Specimen$ {E}_{+} $
    /GPa

    E/GPa
    $ {E}_{\mathrm{d}\mathrm{i}\mathrm{s}\mathrm{s}} $
    /10–4 J

    Bi/%
    L0%CT/C2.042.045900.533
    L0.5%CT/C2.182.184530.493
    L1.0%CT/C2.102.114750.513
    下载: 导出CSV

    表  7  不同短切钢纤维掺量的C-TRC主裂纹出现时间和出现位置

    Table  7.   Occurrence time and location of major crack of C-TRC with various contents of short steel fiber

    SpecimenNO.1NO.2NO.3
    Occurrence timeLocation
    /mm
    Occurrence timeLocation
    /mm
    Occurrence timeLocation
    /mm
    L0%CT/CBefore fatigue loading43Before fatigue loading36Before fatigue loading42
    L0.5%CT/CBefore fatigue loading438th cycle44Before fatigue loading44
    L1.0%CT/CBefore fatigue loading36Before fatigue loading1516th cycle18
    下载: 导出CSV

    表  8  疲劳加载前后的C-TRC拉伸力学性能试验结果

    Table  8.   Test results of the tensile mechanical properties of C-TRC before and after fatigue loading

    Specimen
    Rigidity/
    GPa
    Reduction rate/%Tensile strength/MPaTensile load/
    kN
    Reduction rate/%Ultimate strain/%Reduction rate/%Toughness/
    (kJ·m−3)
    Reduction rate/%
    Q0%CT/C 24.40 11.20 5.04 1.23 87.78
    Q0.5%CT/C 24.60 12.90 5.81 1.40 106.89
    Q1.0%CT/C 22.30 14.20 6.39 1.37 110.67
    L0%CT/C 1.07 95.6 9.15 4.12 18.2 0.84 32.0 38.00 56.8
    L0.5%CT/C 1.75 92.9 11.40 5.13 11.8 1.13 19.3 66.67 37.7
    L1.0%CT/C 1.14 94.9 11.30 5.09 20.5 0.99 28.0 51.56 53.4
    下载: 导出CSV

    表  9  未添加短切钢纤维时C-TRC的剩余刚度-剩余强度关联模型参数与拟合结果

    Table  9.   Parameters of the residual strength-residual stiffness coupled model of C-TRC without short steel fiber and fitted results

    CycleEq. (8)R2Eq. (9)R2
    $ q $$ w $$ r $$ a $$ H $
    1000.001212.40.930.610.040.680.94
    2000.001414.10.950.740.070.540.93
    Average value0.001313.30.680.060.61
    Notes: q and w—Unknown parameters in Eq.(8); r, a, and H—Unknown parameters in Eq.(9); R2—Goodness of fit.
    下载: 导出CSV

    表  10  不同加载次数下的C-TRC的剩余强度和剩余刚度

    Table  10.   Residual strength and residual rigidity of C-TRC subjected to various loading cycles

    Stress level/
    %
    CycleNO.1NO.2NO.3
    Sr/S0
    /%
    Er/E0
    /%
    Sr/S0
    /%
    Er/E0
    /%
    Sr/S0
    /%
    Er/E0
    /%
    5-6010082.43.186.64.185.34.1
    20081.74.788.44.179.64.4
    30082.35.479.44.581.74.9
    50079.44.277.63.678.34.2
    Notes: Sr and S0—Residual strength and initial strength; Er and E0—Residual stiffness and initial stiffness.
    下载: 导出CSV
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  • 收稿日期:  2022-12-15
  • 修回日期:  2023-01-15
  • 录用日期:  2023-02-11
  • 网络出版日期:  2023-02-22
  • 刊出日期:  2023-11-01

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