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FRP筋/珊瑚混凝土柱轴心受压承载力

陈爽 梁淑嘉 关纪文

陈爽, 梁淑嘉, 关纪文. FRP筋/珊瑚混凝土柱轴心受压承载力[J]. 复合材料学报, 2021, 38(10): 3530-3541. doi: 10.13801/j.cnki.fhclxb.20201217.001
引用本文: 陈爽, 梁淑嘉, 关纪文. FRP筋/珊瑚混凝土柱轴心受压承载力[J]. 复合材料学报, 2021, 38(10): 3530-3541. doi: 10.13801/j.cnki.fhclxb.20201217.001
CHEN Shuang, LIANG Shujia, GUAN Jiwen. Compression behavior of FRP bars/coral concrete columns under axial compression loading[J]. Acta Materiae Compositae Sinica, 2021, 38(10): 3530-3541. doi: 10.13801/j.cnki.fhclxb.20201217.001
Citation: CHEN Shuang, LIANG Shujia, GUAN Jiwen. Compression behavior of FRP bars/coral concrete columns under axial compression loading[J]. Acta Materiae Compositae Sinica, 2021, 38(10): 3530-3541. doi: 10.13801/j.cnki.fhclxb.20201217.001

FRP筋/珊瑚混凝土柱轴心受压承载力

doi: 10.13801/j.cnki.fhclxb.20201217.001
基金项目: 国家自然科学基金(51568013);广西建筑新能源与节能重点实验室开放基金(桂科能19-J-21-3);广西科技大学博士基金
详细信息
    作者简介:

    陈爽博士,副教授。研究方向为新型建筑材料,混凝土结构耐久性 E-mail:shuangchen81@163.com

    通讯作者:

    陈爽,博士,副教授,研究方向为新型建筑材料、混凝土结构耐久性  E-mail:shuangchen81@163.com

  • 中图分类号: TU377.9

Compression behavior of FRP bars/coral concrete columns under axial compression loading

  • 摘要: 对8根塑料纤维增强树脂复合材料(FRP)筋/珊瑚混凝土轴心受压柱和1根钢筋/珊瑚混凝土轴心受压柱进行了承载能力试验,试验参数包括配筋率、箍筋间距、长细比和筋材种类。结果表明:相同配筋率下,FRP筋/珊瑚混凝土柱和钢筋/珊瑚混凝土柱的破坏机制不同,但受力性能良好;相同构件尺寸下,增大纵筋直径导致纵筋与混凝土保护层的黏结性能降低;减小箍筋间距有利于提高构件的延性;长细比越大的构件承载力越低。然后,基于筋材压缩性能试验的数据分析及参考文献的对比探讨,建议碳纤维增强树脂复合材料(CFRP)筋名义屈服强度取值为0.34fy(fy为筋材的极限抗压强度),对应的理论值与试验结果相近,从而提出适用于CFRP筋/珊瑚混凝土柱的理论计算,为工程实践提供参考依据。

     

  • 图  1  纤维增强树脂复合材料(FRP)筋试件及加载装置

    Figure  1.  Fiber reinforced polymer (FRP) bars and loading device

    图  2  FRP筋应力-应变曲线

    Figure  2.  Stress-strain curve of FRP bars

    图  3  试件截面尺寸及FRP筋骨架

    Figure  3.  Section size of test piece and FRP bar skeleton

    图  4  主要测点布置及加载装置

    Figure  4.  Loading devices and test points arrangement

    图  5  珊瑚混凝土柱的破坏图

    Figure  5.  Damage pictures of coral concrete columns

    图  6  纵筋破坏图

    Figure  6.  Damage modes of longitudinal bars

    图  7  配筋种类对珊瑚混凝土柱承载力的影响

    Figure  7.  Effect of the type of reinforcement on the bearing capacity of coral concrete columns

    图  8  配筋率对CFRP筋/珊瑚混凝土柱承载力的影响

    Figure  8.  Effect of the reinforcement ratio on the bearing capacity of CFRP bars/coral concrete columns

    图  9  箍筋间距对CFRP筋/珊瑚混凝土柱承载力的影响

    Figure  9.  Effect of stirrup spacing on the bearing capacity of CFRP bars/coral concrete columns

    图  10  长细比对CFRP筋/珊瑚混凝土柱承载力的影响

    Figure  10.  Effect of slenderness ratio on the bearing capacity of CFRP bars/coral concrete columns

    图  11  CFRP筋本构模型

    Figure  11.  Constitutive model of CFRP bar

    图  12  CFRP筋/珊瑚混凝柱土应力云图

    Figure  12.  Mises stress moire figure of CFRP bars/coral concrete column

    图  13  CFRP筋/珊瑚混凝土柱荷载-位移曲线有限元与试验结果对比

    Figure  13.  Comparison of load-displacement curves between FEM and test results of CFRP bars/coral concrete columns

    图  14  不同因素对CFRP筋/珊瑚混凝土柱极限承载力的影响

    Figure  14.  Effect of different factors on ultimate bearing capacity of CFRP bars/coral concrete columns

    图  15  CFRP筋/珊瑚混凝土柱的承载力理论值与试验值对比结果

    Figure  15.  Comparison of theoretical and test values of bearing capacity of CFRP bars/coral concrete columns

    表  1  珊瑚骨料的物理性能

    Table  1.   Physical properties of coral aggregate

    ProjectSaturated water
    absorption
    PorosityWater
    absorption
    Bulk density/
    (kg·m−3)
    Apparent density/
    (kg·m−3)
    Cylinder compression
    strength/MPa
    Result 18% 50% 17.9% 9.63 2400 2.02
    下载: 导出CSV

    表  2  珊瑚混凝土配合比

    Table  2.   Mix proportion of coral concrete

    Concrete strengthP.Ⅱ42.5Cementitious material/(kg·m−3)
    SandCoralSeawaterPre-water absorptionWater reducing agent
    C30 500 729 705 142.5 71.7 5
    下载: 导出CSV

    表  3  珊瑚混凝土物理力学性能

    Table  3.   Physical and mechanical properties of coral concrete

    Concrete strength${f_{{\rm{cu}}}}$/MPa${f_{\rm{c}}}$/MPa${f_{{\rm{ts}}}}$/MPaElastic/GPaPoisson's ratio
    C30 36.02 34.2 3.92 30.6 0.25
    Notes: ${f_{{\rm{cu}}}}$—Cube compressive strength; ${f_{\rm{c}}}$—Axial compressive strength; ${f_{{\rm{ts}}}}$—Splitting tensile strength.
    下载: 导出CSV

    表  4  筋材的力学性能参数

    Table  4.   Mechanical performance parameters of rebar

    SpeciesDiameter/mm${E_{\rm{f}}}$/GPaCompressive strength/MPaYield strength/MPaTensile strength/MPa
    HRB400 steel stirrup 6 210 -- 401.8 527
    HRB400 steel longitudinal bar 10 210 -- 420.2 548.3
    GFRP stirrup 6 38.7 -- -- 592
    CFRP stirrup 6 121.1 -- -- 2040
    GFRP longitudinal bar 10 48.04 676.2 -- 793
    CFRP longitudinal bar 8 126.2 461.2 -- 2106
    CFRP longitudinal bar 10 118.2 458.6 -- 2003
    CFRP longitudinal bar 12 108.2 456.4 -- 1983
    Notes: ${E_{\rm{f}}}$—Material elastic modulus; GFRP—Glass fiber reinforced polymer; CFRP—Carbon fiber reinforced polymer.
    下载: 导出CSV

    表  5  FRP筋/珊瑚混凝土柱试件参数

    Table  5.   Specimen parameters of FRP bars/coral concrete columns

    Specimen
    number
    Stirrup
    spacing/mm
    L/bLongitudinal
    reinforcement ratio/%
    Reinforcement
    pattern
    Ultimate
    load/kN
    μ
    CFRP/CC-1 φ6@50 3.3 2.09 φ10×6 731.1 1.65
    CFRP/CC-2 φ6@75 3.3 2.09 φ10×6 745.1 1.63
    CFRP/CC-3 φ6@100 3.3 2.09 φ10×6 741.1 1.62
    CFRP/CC-4 φ6@100 3.3 1.33 φ8×6 757.9 1.32
    CFRP/CC-5 φ6@100 3.3 3.01 φ12×6 730.3 1.83
    CFRP/CC-6 φ6@100 4.3 2.09 φ10×6 785.1 1.39
    CFRP/CC-7 φ6@100 5.3 2.09 φ10×6 729.2 1.16
    Steel/CC-1 φ6@100 3.3 2.09 φ10×6 957.9 1.37
    GFRP/CC-1 φ6@100 3.3 2.09 φ10×6 797.3 1.31
    Notes:CC—Coral concrete;L/b—Slenderness ratio of column;μ—Ductility coefficient[18].
    下载: 导出CSV

    表  6  CFRP筋/珊瑚混凝土柱的承载力试验值与理论值对比

    Table  6.   Comparison of test and theoretical values of CFRP bars/coral concrete columns

    Specimen number${f_{\rm{c}}}$/MPa${E_{\rm{f}}}$/GPa$f'_{\rm{y}}$/MPa${N_{{\rm{p1}}}}$/kN${N_{{\rm{p2}}}}$/kN$N$/kN${N_{{\rm{p1}}}}/N$${N_{{\rm{p2}}}}/N$
    CFRP/CC-1 34.2 118.2 155.9 788.06 759.53 731.1 1.078 1.042
    CFRP/CC-2 34.2 118.2 155.9 788.06 759.53 745.1 1.058 1.027
    CFRP/CC-3 34.2 118.2 155.9 788.06 759.53 741.1 1.063 1.005
    CFRP/CC-4 34.2 126.2 156.8 781.38 735.42 757.9 1.031 0.966
    CFRP/CC-5 34.2 108.2 155.2 796.22 788.99 730.3 1.090 1.080
    CFRP/CC-6 34.2 118.2 155.9 780.18 751.93 785.1 1.070 1.004
    CFRP/CC-7 34.2 118.2 155.9 788.06 759.53 729.2 1.004 0.974
    Notes: $f'_{\rm{y}}$—Nominal yield strength of CFRP bars;${N_{{\rm{p1}}}}$—Theoretical value (Eq. 2) of bearing capacity; ${N_{{\rm{p2}}}}$—Theoretical value (Eq. 3) of bearing capacity; $N$—Test value.
    下载: 导出CSV
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  • 收稿日期:  2020-10-15
  • 录用日期:  2020-12-04
  • 网络出版日期:  2020-12-17
  • 刊出日期:  2021-10-01

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