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Experimental determination of FRP-concrete cohesive interface properties under fatigue loading

机译：疲劳载荷下FRP-混凝土粘结界面特性的实验确定

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摘要

An experimental investigation of the fatigue behavior of externally strengthened concrete with fiber-reinforced polymers (FRP) is conducted. In the experimental program, strain patterns along the bonded length and the surrounding concrete are determined using digital image correlation. The results herein presented indicate that debonding occurs during fatigue and it is related to the load range. The post-fatigue bond capacity of the interface is not affected by the previous cyclic loading if the remaining bonded part is enough to fully establish the stress transfer zone associated with quasi-static crack growth. Although further research is needed, this work points out several new and interesting aspects of the fatigue behavior of the FRP-concrete interface: (1) during fatigue loading the length of stress transfer zone is smaller than the stress transfer zone associated with the cohesive crack under quasi-static loading; (2) post-fatigue results suggest the possibility of a different debonding mechanism during fatigue loading; (3) fatigue life is dominated by crack initiation for fatigue loading with high amplitude and by crack propagation on decreasing the amplitude of fatigue load cycle.
机译：进行了纤维增强聚合物（FRP）对外部增强混凝土疲劳性能的实验研究。在实验程序中，使用数字图像相关性确定沿粘结长度和周围混凝土的应变模式。本文给出的结果表明，在疲劳过程中会发生剥离，并且与载荷范围有关。如果剩余的粘结部分足以完全建立与准静态裂纹扩展相关的应力传递区域，则界面的疲劳后粘结能力不受先前的循环载荷影响。尽管需要进一步研究，但这项工作指出了FRP-混凝土界面疲劳行为的几个新的有趣的方面：​​（1）在疲劳载荷期间，应力传递区的长度小于与内聚裂纹相关的应力传递区的长度。在准静态载荷下； （2）疲劳后的结果表明在疲劳载荷过程中可能存在不同的脱粘机制； （3）疲劳寿命主要由高振幅疲劳载荷的裂纹萌生和减小疲劳载荷循环幅度的裂纹扩展所决定。

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  • 来源
    《Composite Structures》 |2012年第4期|p.1288-1296|共9页
  • 作者

    Christian Carloni; Kolluru V. Subramaniam; Marco Savoia; Claudio Mazzotti;

  • 作者单位

    Dept. of Architecture, University of Hartford, Hartford, CT, USA;

    Dept. of Civil Engineering, Indian Institute of Technology, Hyderabad, India;

    Dept. of Civil, Environmental and Materials Engineering, University of Bologna, Bologna, Italy;

    Dept. of Civil, Environmental and Materials Engineering, University of Bologna, Bologna, Italy;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    FRP; debonding; fatigue; concrete; interface;

    机译：玻璃钢;脱胶疲劳;具体;接口;

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