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循环荷载作用下纤维增强蒸压加气混凝土力学性能试验

权文立 黄炜 毛文桢 苗欣蔚 侯莉娜 郝利军

权文立, 黄炜, 毛文桢, 等. 循环荷载作用下纤维增强蒸压加气混凝土力学性能试验[J]. 复合材料学报, 2024, 42(0): 1-12.
引用本文: 权文立, 黄炜, 毛文桢, 等. 循环荷载作用下纤维增强蒸压加气混凝土力学性能试验[J]. 复合材料学报, 2024, 42(0): 1-12.
QUAN Wenli, HUANG Wei, MAO Wenzhen, et al. Experimental research on the mechanical properties of fiber-reinforced autoclaved aerated concrete under cyclic loading[J]. Acta Materiae Compositae Sinica.
Citation: QUAN Wenli, HUANG Wei, MAO Wenzhen, et al. Experimental research on the mechanical properties of fiber-reinforced autoclaved aerated concrete under cyclic loading[J]. Acta Materiae Compositae Sinica.

循环荷载作用下纤维增强蒸压加气混凝土力学性能试验

基金项目: 国家自然科学基金(52378193);国家自然科学基金青年项目(52308203);西安建筑科技大学优秀博士学位论文培育基金(2023XYBPY0010); 陕西省杰出青年科学基金项目(2018JC-025); 陕西省科技计划项目(2021JM-435)
详细信息
    通讯作者:

    黄炜,博士,教授,博士生导师,研究方向为绿色装配式结构抗震性能 E-mail: qqhuangwei2005@126.com

  • 中图分类号: TU528

Experimental research on the mechanical properties of fiber-reinforced autoclaved aerated concrete under cyclic loading

Funds: National Natural Science Foundation of China (52378193); National Natural Science Foundation Youth Program (52308203); Excellent Doctoral Dissertation Cultivation Foundation of Xi’an University of Architecture & Technology (2023XYBPY0010); Shaanxi Science Fund for Distinguished Young Scholars (2018JC-025); Natural Science Foundation of Shaanxi Province (2021JM-435)
  • 摘要: 为研究纤维增强蒸压加气混凝土(FAAC)循环受压力学行为,共设计11组棱柱体试件进行单调及循环受压试验,分析纤维种类(玄武岩纤维,BF;碳纤维,CF)和纤维掺量对FAAC破坏形态、应力-应变全曲线特征、塑性应变、刚度退化率、应力退化率等力学性能指标的影响规律。研究结果表明:循环荷载作用下FAAC的破坏模式主要为剪切破坏和竖向劈裂破坏,随纤维掺量增加,试件破坏模式由剪切破坏转向竖向劈裂破坏;纤维掺量为0.4%时,FAAC的峰值应力增幅最大,BF/AAC的单调加载曲线和循环加载曲线峰值应力分别增加了24.29%、29.16%,CF/AAC的单调加载曲线和循环加载曲线峰值应力则分别增加了31.45%、37.81%;纤维掺量为0.5%时,FAAC的峰值应变增幅最大,BF/AAC的单调加载曲线和循环加载曲线峰值应变分别增加了28.12%、28.77%,CF/AAC的单调加载曲线和循环加载曲线峰值应变则分别增加了37.17%、41.50%;两种纤维均小幅度增加了AAC的累积塑性应变,但纤维掺量与卸载刚度及应力退化率之间未表现出明显的规律。基于试验结果,采用幂函数对FAAC标准化塑性应变与卸载点之间的关系进行拟合;提出应力退化率及加、卸载曲线双折线简化模型;最后,建立了循环荷载作用下FAAC的应力-应变曲线计算方程。

     

  • 图  1  试件生产过程

    Figure  1.  Process of specimen production

    图  2  加载制度示意图

    Figure  2.  Schematic diagram of cyclic loading procedure

    图  3  循环荷载作用下FAAC破坏过程

    Figure  3.  Failure process of FAAC under cyclic loading

    $ {\varepsilon }_{\mathrm{c}} $, $ {\sigma }_{\mathrm{c}} $, and $ {\varepsilon }_{\mathrm{p}} $ are the peak strain, peak stress, and plastic strain of the curve, respectively; $ {\varepsilon }_{\mathrm{u}\mathrm{n}-1} $ and $ {\sigma }_{\mathrm{u}\mathrm{n}-1} $ are the unloading strain and unloading stress of the previous level unloading curve, respectively; $ {\varepsilon }_{\mathrm{u}\mathrm{n}} $ and $ {\sigma }_{\mathrm{u}\mathrm{n}} $ are the unloading strain and unloading stress of the next level unloading curve

    图  4  循环荷载作用下FAAC破坏现象F

    Figure  4.  ig.4 Failure phenomenon of FAAC under cyclic loading

    图  5  循环荷载作用下FAAC最终的破坏现象

    Figure  5.  Final failure phenomenon of FAAC under cyclic loading

    图  6  单调及循环荷载作用下FAAC应力-应变曲线

    Figure  6.  Stress-strain curves of fiber-reinforced AAC under monotonic and cyclic loading

    图  7  FAAC塑性应变与卸载点应变关系

    Figure  7.  Relationship between plain strain and unloading strain

    图  8  FAAC刚度退化图

    Figure  8.  Stiffness degradation of FAAC

    图  9  FAAC应力退化率图

    Figure  9.  Stress degradation of FAAC

    图  10  单调荷载作用下FAAC的归一化应力-应变曲线

    Figure  10.  Normalized stress-strain curve of FAAC under monotonic loading

    图  11  纤维掺量与单调加载曲线拟合参数之间的关系

    Figure  11.  Relationship between fiber content and fitting parameters of stress-strain curve under monotonic loading

    图  12  卸载、再加载曲线简化模型

    Figure  12.  Simplified model for unloading and reloading curves

    $ {\sigma }_{\mathrm{u}\mathrm{n},\mathrm{r}} $—Stress of the point on reloading curve whose strain is equal to that of unloading strain of previous unloading curve

    图  13  FAAC试验曲线与简化计算方程对比图

    Figure  13.  Comparison between test curve and calculation equation

    表  1  纤维基本物理力学性能

    Table  1.   Basic physical and mechanical properties of fiber

    Fiber Density/(g·cm−3) Length/mm Diameter/μm Tensile strength/MPa Melt point/℃ Elastic modulus/GPa
    CF 1.75 3 7 4900 800-900 230
    BF 2.63-2.65 3 7-15 3000-4800 1050 91-110
    Notes: CF—Carbon fiber; BF—Basalt fiber.
    下载: 导出CSV

    表  2  试件配合比

    Table  2.   Mix proportion of AAC

    Tailing sand/wt%Lime/ wt%Cement/wt%Gypsum/wt%Aluminum powder/wt%Water/solid materials
    58.312.925.830.080.50
    下载: 导出CSV

    表  3  试件参数

    Table  3.   Specimen design parameters of AAC

    No.FiberFiber content/wt%No.FiberFiber content/wt%
    AAC--AAC--
    BF/AAC-0.1BF0.1%CF/AAC-0.1CF0.1%
    BF/AAC-0.20.2%CF/AAC-0.20.2%
    BF/AAC-0.30.3%CF/AAC-0.30.3%
    BF/AAC-0.40.4%CF/AAC-0.40.4%
    BF/AAC-0.50.5%CF/AAC-0.50.5%
    Notes: AAC—Autoclaved aerated concreter; BF/AAC-n—Basalt fiber reinforced autoclaved aerated concrete with fiber content of n%, n varies from 0.1 to 0.5; CF/AAC—Carbon fiber reinforced autoclaved aerated concrete with fiber content of n%, n varies from 0.1 to 0.5.
    下载: 导出CSV

    表  4  单调及循环荷载作用下FAAC试件的峰值应力及峰值应变

    Table  4.   Peak stress and peak strain of FAAC under monotonic and cyclic loading

    No.Monotonic loadingCyclic loadingNo.Monotonic loadingCyclic loading
    $ {\varepsilon }_{\mathrm{c}} $/×10−3$ {\sigma }_{\mathrm{c}} $/MPa$ {\varepsilon }_{\mathrm{c}} $/×10−3$ {\sigma }_{\mathrm{c}} $/MPa$ {\varepsilon }_{\mathrm{c}} $/×10−3$ {\sigma }_{\mathrm{c}} $/MPa$ {\varepsilon }_{\mathrm{c}} $/×10−3$ {\sigma }_{\mathrm{c}} $/MPa
    AAC3.9581.9683.9451.883AAC3.9581.9683.9451.883
    BF/AAC-0.14.2682.0564.2932.015CF/AAC-0.14.3272.1944.4182.152
    BF/AAC-0.24.3852.1784.4772.170CF/AAC-0.24.5452.3414.4902.246
    BF/AAC-0.34.7732.3104.8402.347CF/AAC-0.35.0892.5185.0202.454
    BF/AAC-0.44.8052.4464.8312.432CF/AAC-0.45.3432.5875.4962.595
    BF/AAC-0.55.0712.3575.0802.282CF/AAC-0.55.4292.4445.5822.399
    Notes: $ {\varepsilon }_{\mathrm{c}} $—Peak strain of the curve; $ {\sigma }_{\mathrm{c}} $—Peak stress of the curve.
    下载: 导出CSV
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  • 收稿日期:  2024-03-06
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