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体外预应力纤维增强树脂基复合材料(FRP)筋混凝土结构研究进展

   AA

, AA. 体外预应力纤维增强树脂基复合材料(FRP)筋混凝土结构研究进展[J]. 复合材料学报, 2021, 0(0): 1-17.
引用本文: , AA. 体外预应力纤维增强树脂基复合材料(FRP)筋混凝土结构研究进展[J]. 复合材料学报, 2021, 0(0): 1-17.
   , A A. A review of the studies on concrete structures prestressed with external fiber reinforced polymer (FRP) tendons[J]. Acta Materiae Compositae Sinica.
Citation:    , A A. A review of the studies on concrete structures prestressed with external fiber reinforced polymer (FRP) tendons[J]. Acta Materiae Compositae Sinica.

体外预应力纤维增强树脂基复合材料(FRP)筋混凝土结构研究进展

基金项目: 国家自然科学基金(基金号)
详细信息
    通讯作者:

    姓 名,学历,职称,硕士生/博士生导师,研究方向为…… E-mail: ……

  • 中图分类号: TU599

A review of the studies on concrete structures prestressed with external fiber reinforced polymer (FRP) tendons

  • 摘要: 本文从纤维增强树脂基复合材料(FRP)筋、关键技术和构件三个主要方面综述了体外预应力FRP筋混凝土结构的研究成果:①介绍了预应力FRP筋拉伸性能和长期性能,给出了面向设计的FRP筋蠕变断裂应力值、松弛率以及疲劳最大应力和应力幅限值。②阐述了预应力FRP筋三种主要锚固技术的优缺点和减小锚固端应力集中的方法,重点介绍了近年来新开发的复合材料夹片锚具,其锚固效率系数高于90%;同时,基于转向FRP筋力学性能试验结果,建议转向半径不宜小于FRP筋半径的200倍,转向角度不宜大于5°。③梳理了体外预应力FRP筋混凝土构件的试验研究结果(单调加载、长期持荷和循环加载),介绍了国内外规范中的设计方法,并基于既有文献中42根梁的试验结果评价了规范中计算方法的精度,验证了我国规范GB 50608—2020中体外预应力FRP筋混凝土结构设计计算方法的准确性。本综述将对体外预应力FRP筋混凝土结构的推广应用起到积极推动作用。

     

  • 图  1  体外预应力纤维增强树脂基复合材料(FRP)筋混凝土结构示意图

    Figure  1.  Schematic diagram for a concrete structure prestressed with external fiber-reinforced polymer (FRP) tendons

    图  2  FRP筋蠕变松弛性能提升机制示意图[20]

    Figure  2.  Schematic diagram for the improvement mechanism of creep and relaxation behaviors of FRP tendons

    图  3  FRP筋内部初始弯曲纤维与预张拉后的拉直纤维[17]

    Figure  3.  Initial uneven fibers and straightened fibers after pretensioned in a FRP tendon

    图  4  图4 玄武岩纤维增强树脂基复合材料(BFRP)筋疲劳破坏机制[22]

    Figure  4.  Mechanism of the fatigue failure of basalt fiber reinforced polymer (BFRP) tendon

    图  5  FRP筋主要锚固形式

    Figure  5.  Main types of anchor of FRP tendons

    图  6  分段式复合材料夹片[38]

    Figure  6.  Segmented composite wedge

    图  7  图7 FRP筋转向区试验装置[39]

    Figure  7.  Test setup for FRP tendons at a deviator

    图  8  图8转向角度和转向半径对弯折FRP筋承载力保留率的影响[39]

    Figure  8.  Effects of deviation radius and angle on the loading capacity of FRP tendon at deviator

    图  9  体外预应力混凝土梁长期变形与预应力损失

    Figure  9.  Long-term deformation and prestress loss of RC beam prestressed with external tendon

    表  1  FRP筋、高强钢筋、钢绞线拉伸性能[8]

    Table  1.   Tensile properties of FRP tendons, high-strength steel bar and steel strand

    Type of
    tendon
    Density/
    (g/cm3)
    Tensile
    strength/MPa
    Elastic
    modulus/GPa
    Elongation/
    %
    Longitudinal thermal
    expansivity/(10−6/℃)
    CFRP tendon 1.5 1500~2500 120~160 0.5~1.7 −2~0
    BFRP tendon 2.0 800~1800 50~60 1.6~3.0 6~8
    AFRP tendon 1.4 1000~2 000 40~120 1.9~4.4 −6~−2
    High-strength steel bar 7.85 490~700 200 >10 11.7
    Steel strand 7.85 1400~1 860 180~200 >4 11.7
    下载: 导出CSV

    表  2  FRP筋的蠕变断裂应力

    Table  2.   Values of creep rupture stress of FRP tendons

    ReferenceCFRPAFRPBFRP
    Yamaguchi[9] 0.93fu 0.47fu /
    Ando[10] 0.79fu 0.66fu /
    Tokyo Rope[11] 0.85fu / /
    Shi et al.[12] / / 0.54fu
    Banibayat[13] / / 0.15fu
    ACI 440.1 R-15[14] 0.55fu 0.3fu
    ACI 440.4R-04[2] 0.70fu 0.55fu /
    fu is the tensile strength of FRP tendon.
    下载: 导出CSV

    表  3  FRP筋蠕变断裂应力建议值

    Table  3.   Recommended values of the creep rupture stress of FRP tendons

    Type of tendonCFRPAFRPBFRP
    Creep rupture stress 0.70fu 0.55fu 0.54fu
    fu is the tensile strength of FRP tendon.
    下载: 导出CSV

    表  4  0.5fu初始应力下FRP筋百万小时松弛率预测值

    Table  4.   Predictive values of the one-million-hour relaxation rates of FRP tendons at a 0.5fu initial level

    Type of tendonCFRPAFRPBFRP
    Relaxation rate 3.0% 10~13% 6.7%
    下载: 导出CSV

    表  5  FRP筋疲劳强度(括号中为对应的应力幅)

    Table  5.   Values of the fatigue strength of FRP tendons (with the corresponding stress range in the brackets)

    ReferencesCFRPAFRPBFRP
    Saadatmanesh[23-24] 0.9fu (0.05fu) 0.5fu (0.025fu) /
    Adimi et al.[27] 0.35fu (0.21fu) / /
    El Refai[25,28] 0.5fu (0.1fu) / 0.39fu (0.04fu)
    Song et al.[29] 0.64fu (0.09fu)
    0.53fu (0.19fu)
    0.37fu (0.28fu)
    / /
    Xie et al.[30] 0.5fu (0.09fu) / /
    Zhuge et al.[31] 0.42fu (0.04fu) / /
    Zhang and Ou[32] 0.5fu (0.25fu) / /
    Odagiri et al.[33] / 0.54fu (0.05 fu) /
    Wang et al.[22] / / 0.6fu (0.05fu)
    Atutis et al.[34] / / 0.65fu (0.07fu)
    fu is the tensile strength of FRP tendon.
    下载: 导出CSV

    表  6  FRP筋主要锚具形式的优缺点

    Table  6.   Advantages and deficiencies of the main types of anchor for FRP tendons

    Type of anchorAdvantagesDeficiencies
    Bond type No radial stress, hence inducing no decrease in strength of tendon Inconvenient grouting; prestress loss due to long-term creep deformation of the bonding material in anchor
    Friction type Radial stress is beneficial for the long-term
    behavior of anchor
    Inconvenient grouting
    Wedge type Convenient assembly Notch effect on FRP tendon
    下载: 导出CSV

    表  7  FRP筋张拉控制应力σcon

    Table  7.   Tension control stress σcon of FRP tendons

    Type of FRPCFRPAFRPBFRP
    Upper limit0.65 fu0.55 fu0.50 fu
    Lower limit0.50 fu0.35 fu0.35 fu
    fu is the tensile strength of FRP tendon.
    下载: 导出CSV

    表  8  不同R/r下的弯折FRP筋强度折减系数

    Table  8.   Strength reduction coefficients of deviated FRP tendon at different values of R/r

    R/rCFRP tendonAFRP tendonBFRP tendon
    200 0.61 0.75 0.79
    300 0.74 0.83 0.86
    400 0.81 0.88 0.89
    下载: 导出CSV

    表  9  体外预应力FRP筋混凝土梁抗弯性能研究数据库

    Table  9.   Database of the studies on the flexural behaviors of concrete beams prestressed with external FRP tendons

    ReferencesNumber of specimenType of tendon
    Shi[6] 3 BFRP
    Ghallab and Beeby[43] 12 AFRP
    Wang et al.[44] 3 BFRP
    Du et al.[61] 4 CFRP
    El-Refai et al.[62] 3 CFRP
    Bennitz et al.[63] 6 CFRP
    Jung et al.[64] 2 CFRP
    Au et al.[65] 3 AFRP
    Tan et al.[66] 2 CFRP
    下载: 导出CSV

    表  10  体外预应力FRP筋混凝土梁长期性能研究数据库

    Table  10.   Database of the studies on the long-term behaviors of concrete beams prestressed with external FRP tendons

    ReferencesNumber of specimenType of tendon
    Shi[6] 3 BFRP
    Cao and Fang[46] 1 CFRP
    下载: 导出CSV

    表  11  体外预应力FRP筋极限状态应力增量Δσpu的试验值与理论值之比

    Table  11.   Ratios of experimental value to theoretical value of the stress increment Δσpu of external prestressing FRP tendons at ultimate state

    CodesACI 440.4RBS 8110fibGB 50608
    Average value 1.39 2.14 1.58 1.01
    Variance 0.58 0.89 0.45 0.20
    下载: 导出CSV

    表  12  体外预应力FRP筋混凝土梁抗弯承载力的试验值与理论值之比

    Table  12.   Ratios of experimental value to theoretical value of the flexural capacity of concrete beams prestressed with external FRP tendons

    CodesACI 440.4RBS 8110fibGB 50608
    Average value 1.09 1.47 1.10 1.05
    Variance 0.15 0.22 0.13 0.07
    下载: 导出CSV

    表  13  预应力FRP筋混凝土梁裂缝宽度的试验值与理论值之比

    Table  13.   Ratios of experimental value to theoretical value of the crack width of concrete beams prestressed with external FRP tendons

    CodesACI 440.4RfibGB 50608
    Average value0.941.030.92
    Variance0.530.590.65
    下载: 导出CSV

    表  14  预应力FRP筋混凝土梁挠度的试验值与理论值之比

    Table  14.   Ratios of experimental value to theoretical value of the deflection of concrete beams prestressed with external FRP tendons

    CodesACI 440.4RfibGB 50608
    Average value 0.94 0.95 0.92
    Variance 0.34 0.38 0.25
    下载: 导出CSV

    表  15  预应力FRP筋混凝土梁长期挠度(反拱)试验结果与AEMM计算的理论值之比

    Table  15.   Ratios of experimental value to theoretical value calculated using AEMM of the long-term deflection (camber) of concrete beams prestressed with external FRP tendons

    Duration of loading/day501001503005001000
    Average value of Shi[6] 0.92 1.04 1.12 / / /
    Variance of Shi[6] 0.33 0.24 0.46 / / /
    Cao and Fang[46] 1.08 1.12 0.95 0.94 1.15 1.13
    下载: 导出CSV

    表  16  预应力FRP筋混凝土梁长期预应力损失试验结果与AEMM计算的理论值之比

    Table  16.   Ratios of experimental value to theoretical value calculated using AEMM of the prestress loss of concrete beams prestressed with external FRP tendons

    Duration of loading/day50100150
    Average value of Shi[6]1.050.941.08
    Variance of Shi[6]0.230.410.33
    下载: 导出CSV
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