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粘结层和预应力对CFRP板加固损伤钢梁抗弯性能的影响

王海涛 卞致宁 熊浩 陈敏生 吴琼

王海涛, 卞致宁, 熊浩, 等. 粘结层和预应力对CFRP板加固损伤钢梁抗弯性能的影响[J]. 复合材料学报, 2022, 40(0): 1-11
引用本文: 王海涛, 卞致宁, 熊浩, 等. 粘结层和预应力对CFRP板加固损伤钢梁抗弯性能的影响[J]. 复合材料学报, 2022, 40(0): 1-11
Haitao WANG, Zhining BIAN, Hao XIONG, Minsheng CHEN, Qiong WU. Effects of the adhesive layer and prestress on the flexural behavior of damaged steel beams strengthened with CFRP plates[J]. Acta Materiae Compositae Sinica.
Citation: Haitao WANG, Zhining BIAN, Hao XIONG, Minsheng CHEN, Qiong WU. Effects of the adhesive layer and prestress on the flexural behavior of damaged steel beams strengthened with CFRP plates[J]. Acta Materiae Compositae Sinica.

粘结层和预应力对CFRP板加固损伤钢梁抗弯性能的影响

基金项目: 国家自然科学基金(51708174);中建股份科技研发计划项目(CSCEC-2020-Z-1);上海市科技计划项目(20 DZ2253000)
详细信息
    通讯作者:

    熊浩,硕士,高级工程师,研究方向为新材料在土木工程中的应用 E-mail:xionghao@cscec.com

  • 中图分类号: TU399

Effects of the adhesive layer and prestress on the flexural behavior of damaged steel beams strengthened with CFRP plates

  • 摘要: 为了对比粘结层和预应力对碳纤维增强聚合物复合材料(CFRP)板加固损伤钢梁抗弯性能的影响,进行了5根H型损伤钢梁的抗弯试验,分析了特征荷载、荷载-挠度曲线、CFRP板应变及其强度利用率的变化。试验结果表明:有粘结和无粘结CFRP板具有相近的加固效果,特征荷载差值小于2%;非预应力CFRP板在正常使用阶段的加固效果很小,而预应力CFRP板加固钢梁的特征荷载比非预应力CFRP板提高了近30%。平截面假定适用于有粘结CFRP板-钢梁复合截面,而不适用于无粘结CFRP板-钢梁复合截面。相比于非预应力CFRP板,对CFRP板施加预应力可以显著提高CFRP板的强度利用率。建立的有限元模型可以较好地预测试件的抗弯性能,增加CFRP板的预应力、厚度和弹性模量可以提高损伤钢梁的抗弯加固效果。

     

  • 图  1  CFRP板预应力张拉系统

    Figure  1.  Prestress tensioning system of the CFRP plate

    图  2  试验加载装置

    Figure  2.  Test setup of the experiment

    图  3  典型试验现象照片

    Figure  3.  Photos of typical test phenomena

    图  4  CFRP板加固损伤钢梁跨中截面的典型应变分布

    Figure  4.  Typical strain distributions at mid-span section of damaged steel beams strengthened with CFRP plates

    图  5  CFRP板加固损伤钢梁荷载-挠度曲线

    Figure  5.  Load-deflection curves of damaged steel beams strengthened with CFRP plates

    图  6  CFRP板的应变分布

    Figure  6.  Strain distributions of CFRP plates

    图  7  CFRP板加固损伤钢梁的界面粘结-滑移关系

    Figure  7.  Interfacial bond-slip relationship of damaged steel beams strengthened with CFRP plates

    图  8  CFRP板加固损伤钢梁有限元模型

    Figure  8.  Finite element model of damaged steel beams strengthened with CFRP plates

    图  9  CFRP板加固损伤钢梁荷载-挠度曲线对比

    Figure  9.  Comparisons of load-deflection curves of damaged steel beams strengthened with CFRP plates

    图  10  试件B-PUR的位移和应力分布

    Figure  10.  Displacement and stress distributions of the specimen B-PUR

    图  11  CFRP板预应力对CFRP板加固损伤钢梁荷载-挠度曲线的影响

    Figure  11.  Effect of the CFRP plate prestress on the load-deflection curves of damaged steel beams strengthened with CFRP plates

    图  12  CFRP板厚度对CFRP板加固损伤钢梁荷载-挠度曲线的影响

    Figure  12.  Effect of the CFRP plate thickness on the load-deflection curves of damaged steel beams strengthened with CFRP plates

    图  13  CFRP板弹性模量对CFRP板加固损伤钢梁荷载-挠度曲线的影响

    Figure  13.  Effect of the CFRP plate elastic modulus on the load-deflection curves of damaged steel beams strengthened with CFRP plates

    表  1  材料的主要力学性能

    Table  1.   Main mechanical properties of materials

    Material typeElasticity modulus/GPaYielding stress/MPaTensile strength/MPaElongation/%
    Q235 B steel20727142915.78
    CFRP plate163/25161.54
    Adhesive4.5/49.21.64
    下载: 导出CSV

    表  2  CFRP板加固损伤钢梁试件的加固参数

    Table  2.   Strengthening parameters of damaged steel beam strengthened with the CFRP plate specimens

    SpecimenSectional area of CFRP plate/mm2Strengthening methodDesigned prestress
    /MPa
    B-0-Unstrengthening-
    B-BR50×2Bonded strengthening0
    B-UR50×2Unbonded strengthening0
    B-PBR50×2Bonded strengthening850
    B-PUR50×2Unbonded strengthening850
    Notes: In the specimen, the first letter B represents the beam; The number 0 represents the unstrengthening, the letters BR, UR, PBR and PUR represent bonded CFRP plate strengthening, unbonded CFRP plate strengthening, prestressed bonded CFRP plate strengthening, and prestressed unbonded CFRP plate strengthening, respectively.
    下载: 导出CSV

    表  3  CFRP板加固损伤钢梁特征荷载比较

    Table  3.   Comparisons of characteristic loads of damaged steel beams strengthened with CFRP plates

    SpecimenP7.5/kNα7.5/%Py/kNαy/%
    B-0102.5-105.8-
    B-BR104.62.0124.617.8
    B-UR103.40.9126.519.6
    B-PBR131.928.7157.949.2
    B-PUR133.530.2158.549.8
    Notes: P7.5—Load when the mid-span deflection is 7.5 mm; Py—Yielding load; α7.5 and αy—Ratios between the P7.5 and Py of the strengthened beams and those of the unstrengthened beam, respectively.
    下载: 导出CSV

    表  4  CFRP板应变及强度利用率比较

    Table  4.   Comparisons of CFRP plate strain and strength utilization

    Specimenε0/10−6εp7.5/10−6εp7.5/εu/%εpy/10−6εpy/εu/%
    B-BR08555.612878.4
    B-UR05813.87234.7
    B-PBR5605687744.7727647.2
    B-PUR5542630040.9648542.1
    Notes: ε0—Initial tensioning strain of the CFRP plate; εp7.5—Strain of the CFRP plate at P7.5; εpy—Strain of the CFRP plate at Py; εu—Ultimate strain of the CFRP plate.
    下载: 导出CSV

    表  5  CFRP板加固损伤钢梁有限元与试验结果的对比

    Table  5.   Comparisons of finite element and test results of damaged steel beams strengthened with CFRP plates

    SpecimenP7.5Py
    Test/kNFinite element/kNRatioTest/kNFinite element/kNRatio
    B-0102.5104.41.02105.8106.11.00
    B-BR104.6107.41.03124.6131.11.05
    B-UR103.4104.21.01126.5127.81.01
    B-PBR131.9138.31.05157.9164.51.04
    B-PUR133.5137.61.03158.5163.41.03
    下载: 导出CSV
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  • 收稿日期:  2022-02-21
  • 录用日期:  2022-04-01
  • 修回日期:  2022-03-31
  • 网络出版日期:  2022-04-18

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