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聚丙烯纤维珊瑚海水混凝土循环受压试验及应力-应变本构关系

陈宗平 覃钦泉 梁莹 周济

陈宗平, 覃钦泉, 梁莹, 等. 聚丙烯纤维珊瑚海水混凝土循环受压试验及应力-应变本构关系[J]. 复合材料学报, 2023, 42(0): 1-13.
引用本文: 陈宗平, 覃钦泉, 梁莹, 等. 聚丙烯纤维珊瑚海水混凝土循环受压试验及应力-应变本构关系[J]. 复合材料学报, 2023, 42(0): 1-13.
CHEN Zongping, QIN Qinquan, LIANG Ying, et al. Cyclic compression test and stress-strain constitutive relationship of polypropylene fiber coral seawater concrete[J]. Acta Materiae Compositae Sinica.
Citation: CHEN Zongping, QIN Qinquan, LIANG Ying, et al. Cyclic compression test and stress-strain constitutive relationship of polypropylene fiber coral seawater concrete[J]. Acta Materiae Compositae Sinica.

聚丙烯纤维珊瑚海水混凝土循环受压试验及应力-应变本构关系

基金项目: 国家自然科学基金(51578163);中央引导地方科技发展资金项目(桂科 ZY21195010);八桂学者专项研究经费项目([2019]79号);广西科技基地和人才专项(AD210750031);广西大学对口支援学科建设项目(2023N01)
详细信息
    通讯作者:

    梁莹,硕士,高级工程师,研究方向为再生混凝土结构、海洋及近海混凝土结构 E-mail:liangying@unn.edu.cn

  • 中图分类号: TU528

Cyclic compression test and stress-strain constitutive relationship of polypropylene fiber coral seawater concrete

Funds: The National Natural Science Foundation of China (51578163); Central Leading Local Science and Technology Development Fund Project (ZY211195010); Bagui Scholars Program ([2019]79); Guangxi Science and Technology Base and Talent Special Project (Guike AD21075031); Counterpart Aid Project for Discipline Construction from Guangxi University (2023N01)
  • 摘要: 为研究聚丙烯纤维珊瑚海水混凝土(PPF/CAC)在循环受压荷载作用下的力学行为,以聚丙烯纤维体积分数和加载方式为变化参数,设计了20个圆柱体试件进行单轴受压以及单轴循环受压试验。试验观察了PPF/CAC的破坏形态,获取了应力-应变全曲线及峰值应力应变、塑性应变等重要指标,深入分析了PPF/CAC在单轴循环受压作用下的应力-应变行为和损伤演化。结果表明:与单调加载相比,循环加载试件的强度退化了1.21%~3.67%,聚丙烯纤维能有效延缓强度退化;聚丙烯纤维体积分数为0.15%时珊瑚混凝土的峰值应力和峰值应变增幅最大,分别为10.45%和6.45%,改性效果最好;此外,聚丙烯纤维体积分数的增加可显著降低塑性应变的积累,提高弹性刚度比。本文根据试验结果定义了滞回曲线的四个特征点:卸载点、公共点、残余点和终点,并建立了残余应变、公共点应变和终点应变与卸载应变的关系。最后,提出了PPF/CAC在循环荷载作用下的应力-应变本构方程和损伤本构模型,且基于损伤演化规律简化后的应力-应变本构方程可以有效地预测其在循环荷载作用下的应力-应变行为。

     

  • 图  1  投料顺序图

    Figure  1.  Diagram of feeding sequence

    图  2  珊瑚骨料外观

    Figure  2.  Coral aggregate appearance

    图  3  坍落度测量

    Figure  3.  Slump measurement

    图  4  加载装置

    Figure  4.  Loading device

    图  5  加载制度示意图

    Figure  5.  Loading regime diagram

    图  6  PFCAC试件的观测

    Figure  6.  Observation of PFCAC specimen

    图  7  典型PPF/CAC试件破坏形态

    Figure  7.  Failure pattern of typical PPF/CAC specimen

    图  8  PPF/CAC试件应力-应变曲线

    Figure  8.  Stress-strain curves of PPF/CACspecimens

    图  9  每组PPF/CAC试件平均应力-应变曲线

    Figure  9.  Average stress-strain curve of each group of PPF/CAC specimens

    图  10  PPF/CAC循环受压全过程示意图

    Figure  10.  The whole process diagram of PPF/CAC specimen under cyclic compression

    图  11  PPF/CAC试件峰值应变

    Figure  11.  Peak strain of PPF/CAC specimens

    图  12  PPF/CAC试件峰值应力

    Figure  12.  Peak stress of PPF/CAC specimens

    图  13  PPF/CAC试件刚度退化

    Figure  13.  Stiffness degradation of PPF/CAC specimens

    图  14  PPF/CAC试件残余应变xp与卸载应变xu关系

    Figure  14.  Relation between residual strain xp and unloading strain xu of PPF/CAC specimens

    图  15  PPF/CAC试件公共点应变xc与残余应变xu的关系

    Figure  15.  Relationship between common point strain xc and residual strain xu of PPF/CAC specimens

    图  16  PPF/CAC试件终点应变xe与残余应变xu的关系

    Figure  16.  Relationship between terminal strain xe and residual strain xu of PPF/CAC specimens

    图  17  PPF/CAC归一化应力-应变曲线及模型验证

    Figure  17.  Normalized stress-strain curves of PPF/CAC and model validation

    图  18  PPF/CAC试件在循环加载下的损伤指数变化

    Figure  18.  Change of damage index of PPF/CAC specimens under cyclic loading

    图  19  PPF/CAC试件损伤指数df的拟合结果

    Figure  19.  Fitting result of damage index df of PPF/CAC specimens

    图  20  参数ab的拟合结果

    Figure  20.  Fitting results of parameters a and b

    表  1  试件配合比及设计参数(kg/m3)

    Table  1.   Sample fit ratio and design parameters

    Specimen numberCementCoarse aggregateFine aggregateWaterwater reducerVPPF/%
    0%PPF/CAC53067275325210.6-
    0.1%PPF/CAC53067275325210.60.10
    0.15%PPF/CAC53067275325210.60.15
    0.2%PPF/CAC53067275325210.60.20
    0.25%PPF/CAC53067275325210.60.25
    Notes: VPPF—Polypropylene fiber volume content.
    下载: 导出CSV

    表  2  珊瑚骨料的物理性能

    Table  2.   Mechanical and physical parameters of coral aggregate

    Coral aggregate Bulk density /(kg·m−3) Performance density/(kg·m−3) Water content/% Water absorption/%
    1 h 24 h
    Coarse aggregate 878 1846 2.3 8.5 9.6
    Fine aggregate 1285 2701 2.4 3.45 3.70
    下载: 导出CSV

    表  3  聚丙烯纤维基本物理性能

    Table  3.   Basic physical properties of polypropylene fibers

    Physical property PPF Fiber appearance
    d/mm 0.048
    l/mm 19
    Tensile strength/MPa >550
    Density/(g·cm−3) 0.91
    Elasticity modulus/GPa 6.5
    Elongation at break/% 15
    Notes: d—Diameter of fiber; l—Length of fiber.
    下载: 导出CSV

    表  4  经典混凝土残余应变计算公式

    Table  4.   Residual strain calculation formula of classical concrete

    Constitutive model name Residual strain formula
    Karsan[27] model $ {x_{\text{p}}} = 0.145 x_{\text{u}}^2 + 0.127{x_{\text{u}}} $
    Bahn and Hsu[28] model $ {x_{\text{p}}} = {c_{\text{p}}}{({x_{\text{u}}})^{{n_{\text{p}}}}} $
    Biao Li[16] Linear function model $ {x_{\text{p}}} = G{x_{\text{u}}} + H $
    Notes: xp—Remanent strain; xu—Unloading strain; cp, np, G and H—Model parameter.
    下载: 导出CSV

    表  5  i次循环荷载下PPF/CAC试件的损伤指数

    Table  5.   Damage index of PPF/CAC specimens under i cycle load

    Specimendf4df5df6df7df8df9df10df11df12df13df14df15
    0%PPF/CAC0.3500.5560.6450.7230.7590.7960.8150.8340.8560.8670.8810.892
    0.1%PPF/CAC0.3100.4710.5680.6420.6710.7390.7610.7840.8020.8110.8250.821
    0.15%PPF/CAC0.2870.4160.5260.5970.6370.6710.7100.7250.7460.7590.7740.789
    0.2%PPF/CAC0.2430.3640.4680.5440.5760.6240.6550.6670.6860.7140.7250.736
    0.25%PPF/CAC0.1840.3020.3900.4460.5130.5700.6270.6560.6670.7000.7030.704
    Notes: The data in the table are the average values of the three specimens in each group, dfi—Damage index under i cycle load.
    下载: 导出CSV
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  • 收稿日期:  2023-10-20
  • 修回日期:  2023-11-14
  • 录用日期:  2023-12-06
  • 网络出版日期:  2023-12-21

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