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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, 42(0): 1-13.
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, 42(0): 1-13.
DENG Mingke, YAO Xin, ZHANG Yangxi, et al. Bonding properties of UHPC-high strength rebar based on beam test[J]. Acta Materiae Compositae Sinica.
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.

基于梁式试验的UHPC-高强钢筋搭接黏结性能

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

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(Ultra-high-performance concrete, 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(单位:mm)

    Figure  1.  Sample and top view of beam (Unit: mm)

    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(单位:mm)

    Figure  2.  Beam cross-section reinforcement diagram and keyway schematics (Unit: mm)

    图  3  机械锚固措施图

    Figure  3.  Mechanical anchorage measure diagram

    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

    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 curve 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

    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 $-Lap beam section height; $ {h_{\text{0}}} $-Effective height of lap beam section; $ {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/% 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; L-Lap length; d-Steel bar diameter; Lap form-Different mechanical anchorage measures; Vf-Fibre volume fraction; fs-Calculated tensile strength of rebar.
    下载: 导出CSV

    表  2  UHPC材料性能

    Table  2.   Material properties of UHPC

    Vf/%fcu/MPafc/MPaft/MPa
    2123.3113.26.22
    3135.6122.77.01
    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

    NumberTypeLVf/%Lap formCenter pull-out testBrace lap testBeam lap testτu2/τu1τu3/τu2
    τu1/MPaFailure modeτu2/MPaFailure modeτu3/MPaFailure 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-BOF0.63-
    SPF15.6BOF0.650.68
    B3UHPC8d2%Straight rebar lap20.8SPF16.2SPF14.0BOF0.780.86
    B4UHPC12d2%Straight rebar lap14.4RF12.3RF10.3BOF0.850.84
    B5UHPC3d3%Straight rebar lap49.7SPF27.6SPF25.2BOF0.560.91
    B6UHPC3d2%Hook treatment--50.7RF46.7BEF-0.92
    B7UHPC3d2%Anchor plate--25.2SPF21.4BOF-0.85
    B8UHPC3d2%One side weld--27.1SPF21.4BOF-0.79
    B9UHPC3d2%Two side weld--28.4SPF33.6BOF-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/% 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:  2024-01-31

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