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新型CFRP-UHPC组合管混凝土圆柱轴压性能

刘磊 何真 汪鹏 蔡新华 韩笛扬 罗滔

刘磊, 何真, 汪鹏, 等. 新型CFRP-UHPC组合管混凝土圆柱轴压性能[J]. 复合材料学报, 2022, 40(0): 1-15
引用本文: 刘磊, 何真, 汪鹏, 等. 新型CFRP-UHPC组合管混凝土圆柱轴压性能[J]. 复合材料学报, 2022, 40(0): 1-15
Lei LIU, Zhen HE, Peng WANG, Xinhua CAI, Diyang HAN, Tao LUO. Axial compression behavior of novel concrete-filled circular CFRP-UHPC composite tubular columns[J]. Acta Materiae Compositae Sinica.
Citation: Lei LIU, Zhen HE, Peng WANG, Xinhua CAI, Diyang HAN, Tao LUO. Axial compression behavior of novel concrete-filled circular CFRP-UHPC composite tubular columns[J]. Acta Materiae Compositae Sinica.

新型CFRP-UHPC组合管混凝土圆柱轴压性能

基金项目: 国家“973”重点基础研究发展计划资助项目 (2015 CB655101);山东省自然科学基金项目 (ZR2021 ME002)
详细信息
    通讯作者:

    何真,博士,教授,博士生导师,研究方向为水泥化学和新型低碳水工材料 E-mail: hezhen@whu.edu.cn

  • 中图分类号: TU398.9;TU375.3;TU317.1

Axial compression behavior of novel concrete-filled circular CFRP-UHPC composite tubular columns

Funds: National Key Basic Research Program of China (973 Program) (2015 CB655101); Natural Science Foundation of Shandong Province of China (ZR2021 ME002)
  • 摘要: 为研究超高性能混凝土(UHPC)管替代碳纤维增强聚合物(CFRP)-钢管混凝土组合柱中钢管的可行性,提出一种外部缠绕CFRP的UHPC预制管、内部现浇填充普通混凝土的新型CFRP-UHPC组合管混凝土(Concrete-filled CFRP-UHPC Tube,CFFUT)柱。对10个CFFUT圆柱(包含2个对比柱)进行了单调轴压试验,研究了UHPC管壁厚度、CFRP环向包裹层数和核心混凝土强度等的影响规律。结果表明:CFRP-UHPC管可以有效提高组合柱的承载力、变形能力和延性;CFFUT圆柱破坏形态为核心混凝土压溃、UHPC管开裂和CFRP拉断,破坏后整体性较好,属延性破坏模式;CFFUT圆柱的极限承载力与UHPC管壁厚度、CFRP层数和核心混凝土强度呈正相关;延性系数随UHPC管壁厚度、CFRP层数增加而提高,随核心混凝土强度增加先提高后降低。揭示了CFFUT柱的界面增强作用机制,CFFUT柱极限承载力与同等截面普通混凝土柱相比提高93.9%~203.5%,且CFFUT柱极限承载力一定程度上与CFRP-钢管混凝土柱相当。建立了CFFUT圆柱轴压极限承载力理论计算模型,并通过有限元模拟验证,理论值、模拟值和试验结果吻合较好。

     

  • 图  1  CFRP-UHPC组合管混凝土(CFFUT)柱示意图

    Figure  1.  Sketch of concrete-filled CFRP-UHPC tube (CFFUT) columns

    图  2  CFFUT柱制作流程

    Figure  2.  Preparation of CFFUT columns

    图  3  测量元件布置及加载装置

    Figure  3.  Measurement instruments and test setup

    图  4  CFFUT柱试件典型破坏模式

    Figure  4.  Typical failure modes of CFFUT column specimens

    图  5  CFFUT柱典型轴向荷载-位移(PΔ)曲线

    Figure  5.  Typical axial load-deformation (PΔ) responses of CFFUT columns

    图  6  不同CFRP层数柱试件荷载-轴向位移(P−Δ)关系曲线

    Figure  6.  Axial load-deformation (P−Δ) responses of CFFUT specimens with different CFRP layer numbers

    图  7  CFFUT柱极限承载力Pu与CFRP层数ncf的关系

    Figure  7.  Relationship between bearing capacity of CFFUT columns and CFRP layer numbers

    图  8  不同UHPC管壁厚度CFFUT柱试件荷载-轴向位移(P−Δ)关系曲线

    Figure  8.  Axial load-deformation (P−Δ) responses of CFFUT specimens with different UHPC tube thickness

    图  9  CFFUT柱极限承载力Pu与UHPC管壁厚度tu的关系

    Figure  9.  Relationship between bearing capacity of CFFUT columns and UHPC tube thickness

    图  10  不同核心混凝土强度CFFUT柱试件荷载-轴向位移(P−Δ)关系曲线

    Figure  10.  Axial load-deformation (P−Δ) responses of CFFUT column specimens with different filled concrete strength

    图  11  CFFUT柱极限承载力Pu与核心混凝土强度的关系

    Figure  11.  Relationship between bearing capacity of CFFUT columns and filled concrete strength

    图  12  不同组合柱位移延性系数

    Figure  12.  Definition of ductility factor for different composite columns

    图  13  CFRP-UHPC-普通混凝土(NC)界面概念图

    Figure  13.  Schematic diagram of CFRP-UHPC-normal concrete (NC) interface

    图  14  UHPC-NC界面

    Figure  14.  Interface of UHPC- NC

    图  15  CFFUT柱与CFRP-钢管混凝土柱(CFFST)的承载力比较

    Figure  15.  Comparison of bearing capacity between CFFUT columns and concrete-filled CFRP-steel tube (CFFST) columns

    图  16  CFFUT柱轴心受力示意图

    Figure  16.  Schematic diagram of CFFUT columns under uniaxial compression

    图  17  CFFUT柱有限元模型

    Figure  17.  Finite element model of CFFUT column

    图  18  典型CFFUT柱试验和有限元破坏模式对比

    Figure  18.  Comparison of failure modes between test and FEM result of typical CFFUT column

    图  19  CFRP、UHPC和混凝土的损伤云图

    Figure  19.  Damage cloud map of CFRP、UHPC and concrete

    图  20  CFRP、UHPC和混凝土的等效塑性应变

    Figure  20.  Strain distribution of CFRP、UHPC and concrete

    图  21  CFFUT柱计算值Nu、模拟值Nu,FE与试验结果Pu比较

    Figure  21.  Comparison of calculated values Nu, simulated values Nu,FE and test results Pu of CFFUT columns

    表  1  试件编号及参数

    Table  1.   No. and parameters of specimens

    Specimen No.tu /mmncffcu /MPafc /MPafts /MPaE /GPaPu /kNαΔu /mmβμ
    MA-0-0--32.828.92.6226.5724.01.0002.4291.0001.14
    MA-0-U12.512.5032.828.92.6226.5977.01.3494.2131.7341.31
    MA-F0100-U12.512.5132.828.92.6226.51403.81.9398.1643.3611.45
    MA-F0100-U2020132.828.92.6226.51476.02.0397.5773.1191.52
    MA-F0100-U3030132.828.92.6226.51650.22.2795.8232.3971.59
    MA-F0200-U12.512.5232.828.92.6226.51811.82.50211.2954.651.55
    MA-F0200-U3030232.828.92.6226.52197.63.0358.9293.6761.64
    MA-F0200-U12.5-C5012.5253.547.33.6932.02186.03.0199.6973.9921.59
    MA-F0200-U12.5-C8012.5290.469.64.1336.82418.03.3409.2143.7931.66
    MA-F0200-U12.5-C10012.52118.0105.76.6544.12664.23.6805.4242.2331.31
    Notes: tu—Thickness of UHPC tube; ncf—Number of CFRP layers; fcu—Cubic compressive strength of filled concrete; fc—Axial compressive strength of filled concrete; fts—Splitting tensile strength of filled concrete; E—Elastic modulus of filled concrete; Pu—Ultimate load; α—Ratio of ultimate load between CFFUT column and contrast column (MA-0-0) ; Δu—Ultimate displacement; β—Ratio of ultimate displacement between CFFUT column and contrast column (MA-0-0) ; μ—Ductility factor. The letter MA denotes the monotonic axial load condition, the letter F denotes the number of CFRP layers, the letter U denotes the thickness of UHPC tube, the letter C denotes the nominal filled concrete strength, omitted when C30 filled concrete is used. For example, the MA-F0200-U12.5-C50 indicates that the load condition of specimen is monotonic axial compression, the number of CFRP layers is 2, the thickness of UHPC tube is 12.5 mm, and the nominal filled concrete strength is 50 MPa.
    下载: 导出CSV

    表  2  混凝土和UHPC配合比/(kg·m−3)

    Table  2.   Mixture proportion of concrete and UHPC/(kg·m−3)

    Typem(C)m(SF)m(FA)m(CAGG)m(FAGG)m(W)m(SP)m(F)
    C30280-7010438261755.1-
    C50363-8010557381559.0-
    C8045540-10806651509.9-
    C100787126136-105018926-
    UHPC787126136-105018926195
    Notes: m—Mass per cubic meter; C—Cement; SF—Silica fume; FA—Fly ash; CAGG—Coarse aggregate; FAGG—Fine aggregate; W—Water; SP—Superplasticizer; F—Steel fiber.
    下载: 导出CSV

    表  3  CFFUT柱计算值Nu、模拟值与试验结果Pu比较

    Table  3.   Comparison of calculated values Nu, simulated values Nu,FE and test results Pu of CFFUT columns

    Specimen No.Nu /kNNu,FE /kNNu/PuNu,FE/Pu
    MA-F0100-U12.51350.01362.40.960.97
    MA- F0100-U201615.71499.41.091.02
    MA- F0100-U301917.11523.91.160.92
    MA-F0200-U12.51671.51875.10.921.03
    MA- F0200-U302238.62116.11.020.96
    MA-F0200-U12.5- C501897.2-0.87-
    MA-F0200-U12.5- C802170.7-0.90-
    MA-F0200-U12.5- C1002613.5-0.98-
    下载: 导出CSV
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  • 收稿日期:  2022-04-22
  • 录用日期:  2022-06-14
  • 修回日期:  2022-06-13
  • 网络出版日期:  2022-06-29

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