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CFRP板横截面尺寸对水平嵌贴CFRP-混凝土界面黏结性能的影响研究
Study on the Effect of Cross-Sectional Dimensions of CFRP Strip on the Bond Behavior of the Horizontal-Embedded CFRP-Concrete Interface
投稿时间:2023-04-05  修订日期:2023-06-08
DOI:
中文关键词:  NEEE  水平嵌贴  CFRP板横截面尺寸  黏结性能  黏结-滑移本构  有限元模拟
英文关键词:NEEE  horizontal-embedded  cross-sectional dimensions of the CFRP strip bond behavior  bond-slip constitutive  finite element simulation
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目)
作者单位邮编
兰川云 长沙理工大学 410114
娄逸群 长沙理工大学 410114
丑佳璇 长沙理工大学 410114
粟淼 长沙理工大学 410114
彭晖* 长沙理工大学 410114
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中文摘要:
      端部嵌贴(NEEE)预应力CFRP板加固技术是一种新型高效的混凝土结构加固方式,在该技术加固的混凝土结构中,水平嵌贴CFRP与混凝土的界面黏结能力是可靠锚固CFRP并保证加固结构受力性能的基础。因此,本文针对水平嵌贴技术适用的板宽与板厚范围进行研究,为NEEE CFRP板加固混凝土结构提供设计依据。通过单剪拉拔试验,研究了CFRP板条横截面尺寸与局部界面黏结滑移特征参数之间的相关性,明确了最佳CFRP板条宽度和厚度。进一步通过归纳统计,分别建立了水平嵌贴条件下CFRP板条宽度以及厚度与峰值界面黏结剪应力以及峰值相对滑移值的函数关系式,最终得到了随CFRP板条宽度与厚度变化的水平嵌贴CFRP板-混凝土界面黏结-滑移本构模型。在此基础上,通过ABAQUS有限元软件进一步对黏结-滑移本构模型进行验证分析。
英文摘要:
      The near end enhanced embedment (NEEE) prestressed CFRP strip reinforcement technology is a new and efficient way to strengthen concrete structures. The interfacial bond behavior between the horizontal-embedded CFRP and the concrete is the basis for reliable anchoring CFRP and ensuring the mechanical performance of the strengthened structure. This paper therefore investigates the range of strip widths and strip thicknesses for which the horizontal-embedded technique is applicable, in order to provide a basis for the design of NEEE CFRP strip reinforcement concrete structures. The correlation between the cross-sectional dimensions of the CFRP strip and the local interfacial bond-slip characteristic parameters is investigated through single shear pull-out test, and the optimum CFRP strip width and thickness are defined. Further through inductive statistics, the functional relationship between the optimum width and thickness of CFRP strip and the peak interfacial bond shear stress and the peak relative slip value under the horizontal-embedded condition are established respectively. Finally, the bond-slip constitutive model of the interface between horizontal-embedded CFRP strip and concrete is obtained, which varies with the width and thickness of CFRP strip. On this basis, further validation and analysis of the bond-slip constitutive model were conducted using ABAQUS finite element software.
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