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Characterization of debonding in FRP-strengthened masonry using the acoustic emission technique

机译：用声发射技术表征玻璃纤维增​​强砖的脱胶性能

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摘要

The acoustic emission (AE) technique is used for investigating the interfacial fracture and damage propagation in GFRP- and SRG-strengthened bricks during debonding tests. The bond behavior is investigated through single-lap shear bond tests and the fracture progress during the tests is recorded by means of AE sensors. The effect of hygrothermal conditions on the debonding characteristics and failure mode is also investigated by performing accelerated ageing tests. Accelerated ageing tests resulted in a change of failure mode in GFRP-strengthened specimens which helped in assessment of AE output in different failure modes, but no conclusive strength degradation was observed in the specimens. The results show that the average and cumulative AE energy are correlated to the FRP slip and debonding fracture energy in GFRP-strengthened specimens, respectively. The fracture progress and active debonding mechanisms are characterized using results from the AE technique. Moreover, a clear distinction between the AE outputs of specimens with different failure modes, in both SRG- and GFRP-strengthened specimens, is found which allows characterizing the debonding failure mode based on acoustic emission data. The tests performed in this study are also a contribution towards the application of AE techniques for on-site health monitoring of strengthened masonry structures.
机译：声发射（AE）技术用于研究在脱胶测试中GFRP和SRG增强砖的界面断裂和损伤传播。通过单圈剪切粘结测试研究粘结行为，并通过AE传感器记录测试过程中的断裂过程。还通过进行加速老化测试，研究了湿热条件对剥离性能和破坏模式的影响。加速的老化测试导致GFRP增强试样的破坏模式发生了变化，这有助于评估不同破坏模式下的AE输出，但是在样本中未观察到结论性的强度降低。结果表明，在GFRP加固的试样中，平均AE能量和累积AE能量分别与FRP滑移和脱粘断裂能相关。使用AE技术的结果来表征断裂的进展和主动的剥离机制。此外，在SRG和GFRP加固的样品中，发现了具有不同破坏模式的样品的AE输出之间的明显区别，这可以基于声发射数据表征脱粘破坏模式。在这项研究中进行的测试也是对AE技术在加强砖石结构现场健康监测中的应用做出的贡献。

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  • 来源
    《Engineering Structures》 |2014年第5期|24-34|共11页
  • 作者

    Bahman Ghiassi; Els Verstrynge; Paulo B. Louren; Daniel V. O1iveira;

  • 作者单位

    ISISE, University ofMinho, Department of Civil Engineering. Azurem, 4800-058 Cuimaraes, Portugal;

    KU Leuven, Department of Civil Engineering, Building Materials and Technology Division. Kasteelpark Arenberg 40. B-3001 Heverlee, Belgium;

    ISISE, University ofMinho, Department of Civil Engineering. Azurem, 4800-058 Cuimaraes, Portugal;

    ISISE, University ofMinho, Department of Civil Engineering. Azurem, 4800-058 Cuimaraes, Portugal;

  • 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

    Acoustic emission; FRP; Strengthening; Masonry; Debonding;

    机译：声发射;玻璃钢;强化;石工;脱胶;

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