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基于梁式试验的UHPC-高强钢筋搭接黏结性能

邓明科 姚昕 张阳玺 靳梦娜 曹继涛

邓明科, 姚昕, 张阳玺, 等. 基于梁式试验的UHPC-高强钢筋搭接黏结性能[J]. 复合材料学报, 2024, 41(10): 5527-5539. doi: 10.13801/j.cnki.fhclxb.20240011.002
引用本文: 邓明科, 姚昕, 张阳玺, 等. 基于梁式试验的UHPC-高强钢筋搭接黏结性能[J]. 复合材料学报, 2024, 41(10): 5527-5539. doi: 10.13801/j.cnki.fhclxb.20240011.002
DENG Mingke, YAO Xin, ZHANG Yangxi, et al. Bonding properties of UHPC-high strength rebar based on beam test[J]. Acta Materiae Compositae Sinica, 2024, 41(10): 5527-5539. doi: 10.13801/j.cnki.fhclxb.20240011.002
Citation: DENG Mingke, YAO Xin, ZHANG Yangxi, et al. Bonding properties of UHPC-high strength rebar based on beam test[J]. Acta Materiae Compositae Sinica, 2024, 41(10): 5527-5539. doi: 10.13801/j.cnki.fhclxb.20240011.002

基于梁式试验的UHPC-高强钢筋搭接黏结性能

doi: 10.13801/j.cnki.fhclxb.20240011.002
基金项目: 国家自然科学基金(52108173)
详细信息
    通讯作者:

    张阳玺,博士,副教授,硕士生导师,研究方向为新材料及结构加固 E-mail: yangxizhang@xauat.edu.cn

  • 中图分类号: TU528;TU317.1;TB333

Bonding properties of UHPC-high strength rebar based on beam test

Funds: National Natural Science Foundation of China (52108173)
  • 摘要: 为了研究高强钢筋与超高性能混凝土(UHPC) 的黏结性能,通过梁式搭接试验,设计制作了9根搭接梁,分析了钢筋搭接长度、钢纤维掺量、机械锚固措施对搭接梁中高强钢筋与UHPC黏结性能的影响。结果表明:采用UHPC连接的搭接梁,搭接段受拉钢筋与混凝土具有更优异的黏结性能;随着钢筋搭接长度的增加,搭接梁的峰值荷载提高,但平均黏结强度逐渐减小;搭接梁的峰值荷载和黏结强度随着钢纤维掺量的增大而增大;采用机械锚固措施处理后的搭接梁,具有更高的峰值荷载和黏结强度,其中采用弯钩处理的搭接梁峰值荷载和黏结强度提升最为明显,分别提高了212.4%、199.4%,并且搭接钢筋发生屈服。根据搭接梁达到峰值荷载时轴力和弯矩的平衡条件,计算出搭接梁中钢筋的最大拉应力,进一步建立钢筋与UHPC平均黏结强度的计算方法,并与中心拉拔试验、对拉搭接试验结果进行对比。

     

  • 图  1  梁大样图及俯视图

    Figure  1.  Sample and top view of beam

    1—C40 precast concrete sections; 2—A8@100; 3—Rough surface concave and convex depth 6 mm; 4—Post-cast section

    图  2  梁截面配筋图及键槽示意图

    Figure  2.  Beam cross-section reinforcement diagram and keyway schematics

    图  3  机械锚固措施图

    Figure  3.  Mechanical anchorage measure diagram

    d—Steel bar diameter

    图  4  试件制作图

    Figure  4.  Specimen fabrication diagram

    图  5  哑铃型试件示意图 (单位:mm)

    Figure  5.  Schematic diagram of dumbbell type specimen (Unit: mm)

    图  6  试验加载装置及测点布置图

    Figure  6.  Layout of test loading device and measuring point

    1—Displacement meter; 2—Concrete strain gauge; 3—Pressure sensor; 4—Reaction beam; 5—Hydraulic jack; 6—Distribution beam; 7—Test beam

    图  7  钢筋测点布置

    Figure  7.  Layout of reinforcement measuring points

    图  8  UHPC-高强钢筋梁式搭接试件破坏示意图

    Figure  8.  Schematic diagram of UHPC-high strength rebar beam lap test specimen failure

    图  9  UHPC-高强钢筋梁式搭接试件荷载-挠度曲线

    Figure  9.  Load-deflection curves of UHPC-high strength rebar beam lap test specimen

    图  10  UHPC-高强钢筋梁式搭接试件跨中混凝土应变分析

    Figure  10.  Strain analysis of plane section of UHPC-high strength rebar beam lap test specimen

    F—Load (less than or equal to ultimate load); Fu—Ultimate load of the specimen

    图  11  UHPC-高强钢筋梁式搭接试件搭接段钢筋应变分析

    Figure  11.  Strain analysis of steel bar in lap section of UHPC-high strength rebar beam lap test specimen

    图  12  钢筋应力计算示意图

    Figure  12.  Schematic diagram of reinforcement stress calculation

    $ h $—Beam height; b—Beam width; $ {h_{\text{0}}} $—Effective height of beam; $ {d'} $—Distance from the point of action of the combined forces of the compression reinforcement to the outer edge of the beam; $ {A_{\text{s}}} $—Cross-sectional area of tensile reinforcement; $ {A_{\text{s}}^{\prime}} $—Cross-sectional area of compression reinforcement; $ {x_{\text{c}}} $—Height of compression zone of beam section; $ m $—The depth of the extreme UHPC tensile fiber below the neutral axis; $ {\varepsilon _{\text{t}}} $—Calculated tensile strain of UHPC; $ {\varepsilon _{\text{u}}} $—Compressive strain of UHPC at the extreme compression fiber; $ {\varepsilon _{\text{s}}} $—Actual strain in tensile reinforcement; $ {\varepsilon _{\text{s}}^{\prime}} $—Actual strain in compression reinforcement; $ {f_{\text{y}}} $—Yield stress of tensile reinforcement; $ {f_{\text{y}}^{\prime}} $—Yield stress of compression reinforcement; $ {f_{\text{t}}} $—Measured uniaxial tensile strength of dumbbell specimens; $ {\sigma _{\text{c}}} $—Compressive stress of UHPC at the extreme compression fiber; $ {T_{\text{s}}} $—Combined force of tensile reinforcement; $ {T_{{\text{UHPC}}}} $—Combined force of UHPC in the tension zone; $ {C_{\text{s}}} $—Combined force of compression reinforcement; $ {C_{{\text{UHPC}}}} $—Combined pressure of UHPC in the pressure zone

    图  13  钢筋搭接长度对黏结强度的影响

    Figure  13.  Influence of lap length on bond strength

    图  14  钢纤维掺量对黏结强度的影响

    Figure  14.  Infulence of steel fiber content on bonding strength

    图  15  机械锚固措施对黏结强度的影响

    Figure  15.  Influence of mechanical anchoring measures on bond strength

    表  1  梁式搭接试验试件参数设计及钢筋应力计算结果

    Table  1.   Parameter design of beam lap test specimen and results of reinforcement stress calculation

    Number Type L Lap form Vf/vol% Peak load/kN fs/MPa Yield or not
    B1
    B2
    C80
    UHPC
    3d
    3d
    Straight rebar lap
    Straight rebar lap
    2
    2
    23.5
    95.2

    187
    Not
    Not
    B3 UHPC 8d Straight rebar lap 2 207.8 449 Not
    B4 UHPC 12d Straight rebar lap 2 231.1 494 Not
    B5 UHPC 3d Straight rebar lap 3 145.3 302 Not
    B6 UHPC 3d Hook treatment 2 297.4 560 Yield
    B7 UHPC 3d Anchor plate 2 124.1 257 Not
    B8 UHPC 3d One side weld 2 124.3 257 Not
    B9 UHPC 3d Two side weld 2 188.0 403 Not
    Notes: Type—Type of post-cast concrete in lap section; UHPC—Ultra-high-performance concrete; L—Lap length (Lap form-different mechanical anchorage measures); Vf—Fibre volume fraction; fs—Calculated tensile strength of rebar.
    下载: 导出CSV

    表  2  超高性能混凝土(UHPC)材料性能

    Table  2.   Material properties of UHPC

    Vf/vol% fcu/MPa fc/MPa ft/MPa
    2 123.3 113.2 6.22
    3 135.6 122.7 7.01
    Notes: fcu—Cubic compressive strength; fc—Prismatic compressive strength; ft—Tensile strength.
    下载: 导出CSV

    表  3  钢筋力学性能

    Table  3.   Mechanical properties of reinforcement

    Strength grade Diameter/
    mm
    Yield strength/
    MPa
    Ultimate strength/
    MPa
    HPB300 8 357 529
    HRB500 20 560 715
    下载: 导出CSV

    表  4  UHPC-高强钢筋梁式试验对比

    Table  4.   Test comparison of UHPC-high strength rebar beam lap test

    Number Type L Vf/vol% Lap form Center pull-out test Brace lap test Beam lap test τu2/τu1 τu3/τu2
    τu1/MPa Failure mode τu2/MPa Failure mode τu3/MPa Failure mode
    B1
    B2
    C80
    UHPC
    3d
    3d
    0
    2
    Straight rebar lap
    Straight rebar lap
    19.2
    35.6
    SPF
    SPF
    12.1
    23.1
    SPF BOF 0.63
    SPF 15.6 BOF 0.65 0.68
    B3 UHPC 8d 2 Straight rebar lap 20.8 SPF 16.2 SPF 14.0 BOF 0.78 0.86
    B4 UHPC 12d 2 Straight rebar lap 14.4 RF 12.3 RF 10.3 BOF 0.85 0.84
    B5 UHPC 3d 3 Straight rebar lap 49.7 SPF 27.6 SPF 25.2 BOF 0.56 0.91
    B6 UHPC 3d 2 Hook treatment 50.7 RF 46.7 BEF 0.92
    B7 UHPC 3d 2 Anchor plate 25.2 SPF 21.4 BOF 0.85
    B8 UHPC 3d 2 One side weld 27.1 SPF 21.4 BOF 0.79
    B9 UHPC 3d 2 Two side weld 28.4 SPF 33.6 BOF 1.18
    Notes: All the above specimens are made of HRB500 grade rebar, diameter is 20 mm, the concrete protective layer is 1.5d; τu1—Bond strength obtained by center poll-out test; τu2—Bond strength obtained by brace lap test; τu3—Bond strength obtained by beam lap test; SPF and RF represent the splitting pull-out failure and steel bar rupture failure respectively; BOF and BEF represent the bonding failure of steel bars and the bending failure of lap beams respectively.
    下载: 导出CSV

    表  5  UHPC-高强钢筋搭接长度计算

    Table  5.   Lap length calculation of UHPC-high strength rebar

    Lap
    length
    Vf/vol% Mechanical anchoring measures
    3 Straight
    rebar lap
    Hook treatment Anchor plate One side weld
    lsy 9.8d 11.6d 6.7d 9.4d 8.6d
    lsu 13.7d 16.0d 10.9d 13.6d 12.6d
    Notes: lsy—Minimum lap length of steel bar yield; lsu—Minimum lap length of steel bar rupture.
    下载: 导出CSV
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出版历程
  • 收稿日期:  2023-11-09
  • 修回日期:  2023-12-24
  • 录用日期:  2024-01-03
  • 网络出版日期:  2024-01-12
  • 刊出日期:  2024-10-15

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