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剪力钉构造措施对UHPC模板-现浇NC界面黏结性能的影响

温小栋 龚文波 周明 殷光吉 邓泽玮

温小栋, 龚文波, 周明, 等. 剪力钉构造措施对UHPC模板-现浇NC界面黏结性能的影响[J]. 复合材料学报, 2024, 42(0): 1-13.
引用本文: 温小栋, 龚文波, 周明, 等. 剪力钉构造措施对UHPC模板-现浇NC界面黏结性能的影响[J]. 复合材料学报, 2024, 42(0): 1-13.
WEN Xiaodong, GONG Wenbo, ZHOU Ming, et al. Effect of shear key arrangement on the bonding properties of prefabricated UHPC-NC interface[J]. Acta Materiae Compositae Sinica.
Citation: WEN Xiaodong, GONG Wenbo, ZHOU Ming, et al. Effect of shear key arrangement on the bonding properties of prefabricated UHPC-NC interface[J]. Acta Materiae Compositae Sinica.

剪力钉构造措施对UHPC模板-现浇NC界面黏结性能的影响

基金项目: 浙江省公益基金项目 (LGG21E080007);宁波市自然科学基金项目(202003N4170);宁波市科技创新重大专项(2023Z148)
详细信息
    通讯作者:

    周明,博士,副教授,硕士生导师,研究方向为组合结构、UHPC新型建材等 E-mail: zhouming1426@163.com

  • 中图分类号: TU528

Effect of shear key arrangement on the bonding properties of prefabricated UHPC-NC interface

Funds: the Basic Public Welfare Research Project of Zhejiang Province, China (LGG21E080007); the Ningbo Natural Science Foundation in China (202003N4170); the Major project of Science and Technology Innovation in Ningbo (2023Z148)
  • 摘要: 为了研究预制超高性能混凝土UHPC与普通混凝土(NC)界面的黏结滑移性能,以预制UHPC表面剪力钉的密度和分布间距为试验参数,完成了12组UHPC-NC复合试件的双面剪切试验。结果表明,设置剪力钉构造措施的试件其破坏形态主要有3种,分别为(a) UHPC-NC黏结面与UHPC剪力钉均发生剪切破坏;(b) UHPC-NC黏结面剪切破坏、UHPC剪力钉同时发生剪切和剥离破坏;(c) UHPC-NC黏结面剪切破坏、NC基体轴压破坏。剪力钉密度与分布间距对UHPC-NC试件的黏结面抗剪强度有显著影响;尤其是剪力钉密度,黏结面抗剪强度随着剪力钉密度呈抛物线增长关系。在相同剪力钉密度下,剪力钉分布间距较大试件的黏结面抗剪强度比间距较小试件提高了19.04%~41.74%。基于现有模型及试验结果,建立了考虑黏结面破坏形态及抗剪试验方法的预制UHPC-NC黏结面抗剪强度的计算公式,其计算值与试验值吻合度较高,可为UHPC-NC复合试件的界面设计提供参考。

     

  • 图  1  UHPC模板剪力钉构造方案

    Figure  1.  Construction scheme of shear nail for UHPC formwork

    图  2  UHPC-NC复合试件制作工艺流程图

    Figure  2.  Process flow diagram of UHPC-NC composite specimen production

    图  3  试验加载装置及加载示意图

    Figure  3.  Test loading device and loading schematic diagram

    图  4  UHPC-NC试件上应变片及位移计测点布置示意图(单位:mm)

    Figure  4.  Schematic diagram of the arrangement of strain gauges and displacement measurement points on the specimen (Unit: mm)

    图  5  UHPC-NC试件典型破坏形态

    Figure  5.  Typical failure mode of UHPC-NC specimens

    图  6  各级荷载作用下UHPC-NC试件的荷载-应变曲线

    Figure  6.  Load-strain curves of UHPC-NC specimens under loads at all levels

    图  7  试件N8 K的滑移曲线

    Figure  7.  Slip curve mode of N8 K sample

    图  8  不同参数下UHPC-NC试件的荷载-滑移演化规律

    Figure  8.  Slip evolution rule of UHPC-NC specimens under the influence of different parameters

    图  9  UHPC-NC剪应力-剪力钉密度ρ曲线

    Figure  9.  Shear stress-shear bond density ρ curve of UHPC-NC

    图  10  UHPC-NC黏结抗剪强度

    Figure  10.  Bonding shear strength of UHPC-NC

    表  1  UHPC-NC试件设计

    Table  1.   UHPC-NC Specimen design

    Specimen number Perimeter diameter of
    the shear nail/mm
    Shear nail
    height/mm
    Number of shear
    nails/ piece
    Shear nail
    density
    N0 0 0 0 0
    N1 50 30 1 0.533
    N2 50 30 2 1.067
    N3 50 30 3 1.6
    N4K 50 30 4 2.133
    N6K 50 30 6 3.2
    N8K 50 30 8 4.267
    N12K 50 30 12 6.4
    N18H 50 30 18 9.6
    N4M 50 30 4 2.133
    N4K 50 30 4 2.133
    N8M 50 30 8 4.267
    N8M 50 30 8 4.267
    N12M 50 30 12 6.4
    Note: In N1, N represents shear nails, and 1 represents the number of shear nails; K represents a large distribution interval of shear nails; M represents a small spacing between shear nails.
    下载: 导出CSV

    表  2  试验结果

    Table  2.   Experimental results

    Specimen number Ultimate load Pu/kN Shear stress/MPa Failure mode
    N0 100.2 1.67 Shear failure of the adhesive surface
    N1 130.2 2.17 A
    N2 149.4 2.49 A
    N3 185.8 3.10 A
    N4K 205.99 3.43 B
    N6K 273.2 4.55 B
    N8K 288 4.8 B
    N12K 356.53 5.94 C
    N18K 393.6 6.56 C
    N4M 145.1 2.42 B
    N8M 206 3.43 B
    N12M 299.6 4.99 B
    下载: 导出CSV

    表  3  单个剪力钉的黏结抗剪强度

    Table  3.   Shear strength of a single shear bond

    Specimen number Shear nail density Shear stress/MPa Shear stress after deduction/MPa Shear strength of a single nail/MPa
    N0 0 1.67 1.67 -
    N1 0.53 2.17 0.55 0.55
    N2 1.07 2.49 0.93 0.47
    N3 1.6 3.10 1.59 0.53
    N4K 2.13 3.43 1.98 0.50
    N6K 3.20 4.55 3.21 0.54
    N8K 4.27 4.8 3.57 0.45
    N12K 6.40 5.94 4.93 0.41
    N18K 9.60 6.56 5.87 0.33
    下载: 导出CSV

    表  4  试验结果

    Table  4.   Experimental results

    Specimen number Test values
    τu/MPa
    Eurocode 2
    τ1/MPa
    ACI 318M-05
    τ2/MPa
    AASHTO LRFD
    τ3/MPa
    GB 50010-2010
    τ4/MPa
    τu/τ1 τu/τ2 τu/τ3 τu/τ4
    N0 1.67 0.822 0.55 0.7 0.4 2.032 3.306 2.385 4.175
    N1 2.17 1.057 0.55 0.7 0.4 2.053 3.945 3.1 5.425
    N2 2.49 1.057 0.55 0.7 0.4 2.356 4.527 3.557 6.225
    N3 3.10 1.057 0.55 0.7 0.4 2.933 5.636 4.429 7.75
    N4K 3.43 1.057 0.55 0.7 0.4 3.245 6.236 4.9 8.575
    N6K 4.55 1.057 0.55 0.7 0.4 4.305 8.273 6.5 11.375
    N8K 4.8 1.057 0.55 0.7 0.4 4.541 8.727 6.857 12
    N12K 5.94 1.057 0.55 0.7 0.4 5.620 10.8 8.486 14.85
    N18K 6.56 1.057 0.55 0.7 0.4 6.206 11.927 9.371 16.4
    N4M 2.42 1.057 0.55 0.7 0.4 2.289 4.4 3.457 6.05
    N8M 3.43 1.057 0.55 0.7 0.4 3.245 6.236 4.9 8.575
    N12M 4.99 1.057 0.55 0.7 0.4 4.721 9.073 7.129 12.475
    Notes: τu is the test value of this article; τ1 is the value according to the formula in the Eurocode 2 specification; τ2 is the value according to the formula in ACI 318M-05 specification; τ3 is the value according to the formula in AASHTO LRFD specification; τ4 is the value according to the formula in GB 50010-2010 specification.
    下载: 导出CSV

    表  5  UHPC-NC试件黏结面抗剪强度修正模型计算值与试验值(MPa)

    Table  5.   Calculated values of corrected model and experimental values for shear strength of UHPC-NC specimens (MPa)

    Specimen number Calculated value/MPa
    (Test value/Calculated value)
    Literature [11]
    specimen number
    Calculated value/MPa
    (Test value/Calculated value)
    Literature [21]
    specimen number
    Calculated value/MPa
    (Test value/Calculated value)
    N0 1.589(1.051) SB3 2.822(0.456) ZJ-Z-1-1 2.622(0.793)
    N1 2.111(1.028) SB4 3.355(0.554) ZJ-Z-1-2 3.645(0.850)
    N2 2.606(0.955) SB5 3.693(0.553) ZJ-Z-1-3 4.467(0.698)
    N3 3.070(1.010) SC3 3.892(0.789) ZJ-Z-2-2 3.645(0.859)
    N4K 3.505(0.979) SC4 4.626(0.618) ZJ-Z-2-3 4.467(0.960)
    N6K 4.289(1.061) SC5 5.094(0.601)
    N8K 4.956(0.969) SD3 4.772(0.642)
    N12K 5.940(1.000) SD4 5.673(0.627)
    N18K 6.544(1.002) SD5 6.246(0.603)
    下载: 导出CSV

    表  6  引入参数后UHPC-NC试件黏结面抗剪强度修正模型计算值与试验值(MPa)

    Table  6.   Calculated and experimental values of the modified model of shear strength of bonded surface of UHPC-NC specimens after the introduction of parameters (MPa)

    Specimen number of this document Calculated value/MPa
    (Test value/Calculated value)
    Literature [11]
    specimen number
    Calculated value/MPa
    (Test value/Calculated value)
    Literature [21]
    specimen number
    Calculated value/MPa
    (Test value/Calculated value)
    N0 1.589(1.051) SB3 1.648(0.781) ZJ-Z-1-1 2.181(0.954)
    N1 2.111(1.028) SB4 1.959(0.948) ZJ-Z-1-2 3.033(1.022)
    N2 2.606(0.955) SB5 2.157(0.946) ZJ-Z-1-3 3.717(0.839)
    N3 3.070(1.010) SC3 2.273(1.068) ZJ-Z-2-2 3.033(1.032)
    N4K 3.505(0.979) SC4 2.702(1.058) ZJ-Z-2-3 3.717(1.154)
    N6K 4.289(1.061) SC5 2.975(1.028) - -
    N8K 4.956(0.969) SD3 2.787(1.100) - -
    N12K 5.940(1.000) SD4 3.313(1.074) - -
    N18K 6.544(1.002) SD5 3.648(1.033) - -
    下载: 导出CSV
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  • 收稿日期:  2024-03-25
  • 修回日期:  2024-05-16
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