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CFRP板新型夹持式锚具试验研究

侯苏伟 田树恒 唐志强 席建英

侯苏伟, 田树恒, 唐志强, 席建英. CFRP板新型夹持式锚具试验研究[J]. 西南交通大学学报. doi: 10.3969/j.issn.0258-2724.20240554
引用本文: 侯苏伟, 田树恒, 唐志强, 席建英. CFRP板新型夹持式锚具试验研究[J]. 西南交通大学学报. doi: 10.3969/j.issn.0258-2724.20240554
HOU Suwei, TIAN Shuheng, TANG Zhiqiang, XI Jianying. Experimental Study on a New Clamping Anchor for Carbon Fiber Reinforced Polymer Plate[J]. Journal of Southwest Jiaotong University. doi: 10.3969/j.issn.0258-2724.20240554
Citation: HOU Suwei, TIAN Shuheng, TANG Zhiqiang, XI Jianying. Experimental Study on a New Clamping Anchor for Carbon Fiber Reinforced Polymer Plate[J]. Journal of Southwest Jiaotong University. doi: 10.3969/j.issn.0258-2724.20240554

CFRP板新型夹持式锚具试验研究

doi: 10.3969/j.issn.0258-2724.20240554
基金项目: 国家自然科学基金项目(51508019);北京市教育委员会科技一般项目专项资金项目(KM202010016015)
详细信息
    作者简介:

    侯苏伟(1984—),男,副教授,研究方向为纤维复合材料(FRP)在桥梁工程中的应用,E-mail:housuwei@bucea.edu.cn

  • 中图分类号: U445.72

Experimental Study on a New Clamping Anchor for Carbon Fiber Reinforced Polymer Plate

  • 摘要:

    针对传统碳纤维增强复合材料(CFRP)板锚具压应力沿横向分布不均匀,导致张拉过程中板材易发生撕裂破坏的问题,研制了一种CFRP板新型夹持式锚具. 新型锚具在中轴线上布置预压螺栓,同时设定螺栓长度,通过控制螺栓的位移量对CFRP板施加定量的压紧力,分析新型锚具的受力机理;使用有限元软件ANSYS进行模拟,分析影响锚固性能的关键因素;对厚度为2 mm、宽度为50 mm的CFRP板进行静载张拉试验. 研究结果表明:1) 新型锚具的锚固性能与夹片厚度、外夹板厚度及螺栓预紧力密切相关;当夹片厚度为20 mm时,横向上CFRP板的压应力分布较均匀,最大与最小压应力之差仅为9.8 MPa;当上、下外夹板的厚度分别为30 mm和20 mm时,各构件的弯曲应力均保持在安全范围内;当螺栓预紧力为170 kN时,CFRP板的压应力水平显著提高,而剪切应力始终处于较低水平. 2) 在静载张拉试验中,新型锚具承受的最大张拉力为260.7 kN,锚固效率达到了108.63%;CFRP板的破坏形式为炸丝破坏,未出现撕裂等异常破坏形式,锚具的静载锚固性能优异.

     

  • 图 1  平板锚具构造形式

    Figure 1.  Structural form of flat anchor

    图 2  平板锚具CFRP板压应力横向分布

    Figure 2.  Transverse distribution of compressive stress in CFRP plate with flat anchor

    图 3  新型锚具结构形式

    Figure 3.  Structural form of new anchor

    图 4  锚具受力示意

    Figure 4.  Forces on anchor

    图 5  夹片挤压位移示意图

    Figure 5.  Clamp compression displacement

    图 6  新型锚具CFRP板压应力横向分布

    Figure 6.  Transverse distribution of compressive stress in CFRP plate with new anchor

    图 7  锚具有限元模型

    Figure 7.  Finite element model of anchor

    图 8  选取路径示意

    Figure 8.  Selected paths

    图 9  夹片挤压位移和弯曲应力

    Figure 9.  Compression displacement and bending stress of clamp

    图 10  CFRP板压应力分布

    Figure 10.  Compressive stress distribution in CFRP plate

    图 11  CFRP板剪切应力分布

    Figure 11.  Shear stress distribution in CFRP plate

    图 12  CFRP板主拉应力分布

    Figure 12.  Principal tensile stress distribution in CFRP plate

    图 13  夹片厚度的影响

    Figure 13.  Effect of clamp thickness

    图 14  外夹板厚度的影响

    Figure 14.  Effect of outer clamp plate thickness

    图 15  螺栓预紧力的影响

    Figure 15.  Effect of preload force of bolt

    图 16  试验加载装置

    Figure 16.  Experimental loading device

    图 17  CFRP板破坏形式

    Figure 17.  Failure modes of CFRP plate

    图 18  应变片布置图

    Figure 18.  Strain gauge layout

    图 19  试件S2~S5张拉荷载-应变曲线

    Figure 19.  Tensile load–strain curves for specimens S2–S5

    表  1  锚具各部件主要设计参数

    Table  1.   Main design parameters of anchor components

    部件 设计参数/mm
    CFRP板 横截面尺寸:厚/宽 2/50
    上夹板 长/宽/厚 180/110/30
    下夹板 整体尺寸:长/宽/厚 180/110/42
    凹槽宽度 50
    底部厚度 20
    夹片 长/宽/厚 180/50/20
    圆槽厚度 3
    下载: 导出CSV

    表  2  CFRP板材料性能

    Table  2.   Material properties of CFRP plate

    CFRP尺寸(厚度、
    宽度)/mm
    极限抗拉
    强度/MPa
    极限承
    载力/kN
    弹性模量
    /GPa
    极限延
    伸率/%
    2、5024002401601.5
    下载: 导出CSV

    表  3  钢材材料性能

    Table  3.   Material properties of steel

    材质抗拉强度
    /MPa
    屈服强度
    /MPa
    弹性模量
    /GPa
    泊松比
    Q355B6003552060.32
    下载: 导出CSV

    表  4  螺栓材料性能

    Table  4.   Material properties of bolt

    螺栓等级公称直径
    /mm
    抗拉强度
    /MPa
    屈服强度
    /MPa
    屈强比
    12.920120010800.9
    下载: 导出CSV

    表  5  静载张拉试验结果汇总

    Table  5.   Summary of static load tension test results

    试件
    编号
    理论最大
    承载力/kN
    实际最大
    承载力/kN
    锚固
    效率/%
    CFRP板最终
    破坏形式
    S1 240 213.22 88.84 先劈裂后拉碎
    S2 240 218.37 90.99 先劈裂后拉碎
    S3 240 207.65 86.52 先劈裂后拉碎
    S4 240 246.90 102.88 炸丝破坏
    S5 240 260.70 108.63 炸丝破坏
    S6 240 240.63 100.26 炸丝破坏
    S7 240 249.38 103.91 炸丝破坏
    S8 240 242.53 101.05 炸丝破坏
    下载: 导出CSV
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出版历程
  • 收稿日期:  2024-10-29
  • 修回日期:  2024-12-27
  • 网络出版日期:  2025-04-21

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