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Crack monitoring in historical masonry with distributed strain and acoustic emission sensing techniques
Construction and Building Materials ( IF 7.4 ) Pub Date : 2018-02-01 , DOI: 10.1016/j.conbuildmat.2018.01.103
Els Verstrynge , Kristof De Wilder , Anastasios Drougkas , Eli Voet , Koen Van Balen , Martine Wevers

The analysis of crack patterns and crack growth is one of the most important steps in the assessment of structural damage in historical masonry. In a search for integrated and accurate monitoring techniques for crack measurements in masonry, several novel techniques based on distributed strain monitoring and acoustic emission (AE) sensing have been investigated in an experimental test campaign. Aim of the test program was to develop integration procedures for the strain and AE sensors, analyse their use for crack monitoring specifically in historical masonry and assess their robustness and efficiency with respect to the experimentally observed crack pattern. The applied techniques were integrated optical fibres with distributed fibre Bragg grating sensors (FBGs), stereo-vision digital image correlation (DIC) without the use of a speckle pattern, optical fibre sensors for acoustic emission sensing (AE-FOS), piezo-electric transducers for acoustic emission sensing (AE-PZT) and LVDTs. While the latter two were applied as reference techniques, the former three were under investigation as novel application. This paper discusses the efficiency of the monitoring techniques with respect to their use in masonry, explains the developed integration procedures, and relates the obtained data sets with the deformations and crack pattern obtained in a full-scale masonry wall test. Additionally, the effects of temperature fluctuations are investigated. The configurations that were developed proved effective for crack monitoring in historical masonry. The highest sensitivity and robustness was observed for the integrated optical fibres with FBGs.



中文翻译:

利用分布应变和声发射传感技术对历史砌体中的裂缝进行监测

裂缝模式和裂缝扩展的分析是评估历史砌体结构破坏的最重要步骤之一。在寻找用于砌体裂缝测量的集成且准确的监测技术时,在一项试验性试验中研究了几种基于分布式应变监测和声发射(AE)传感的新颖技术。该测试程序的目的是开发应变和AE传感器的集成程序,分析它们在裂缝监测中的使用,特别是在历史砌筑中的监测,并评估它们在实验观察到的裂纹模式方面的鲁棒性和效率。应用的技术是不带散斑图案的集成光纤和分布式光纤布拉格光栅传感器(FBG),立体视觉数字图像相关性(DIC),用于声发射感测的光纤传感器(AE-FOS),用于声发射感测的压电传感器(AE-PZT)和LVDT。后两者作为参考技术而被应用,前三者正在作为新颖的应用进行研究。本文讨论了在砌体中使用监测技术的效率,解释了开发的集成程序,并将获得的数据集与在大规模砌体墙测试中获得的变形和裂缝模式相关联。此外,研究了温度波动的影响。事实证明,所开发的配置可有效监测历史砌体中的裂缝。对于带有FBG的集成光纤,观察到了最高的灵敏度和鲁棒性。用于声发射感测(AE-PZT)和LVDT的压电换能器。后两者作为参考技术而被应用,前三者正在作为新颖的应用进行研究。本文讨论了在砌体中使用监测技术的效率,解释了开发的集成程序,并将获得的数据集与在大规模砌体墙测试中获得的变形和裂缝模式相关联。此外,研究了温度波动的影响。事实证明,所开发的配置可有效监测历史砌体中的裂缝。对于带有FBG的集成光纤,观察到了最高的灵敏度和鲁棒性。用于声发射感测(AE-PZT)和LVDT的压电换能器。后两者作为参考技术而被应用,前三者正在作为新颖的应用进行研究。本文讨论了在砌体中使用监测技术的效率,解释了开发的集成程序,并将获得的数据集与在大规模砌体墙测试中获得的变形和裂缝模式相关联。此外,研究了温度波动的影响。事实证明,所开发的配置可有效监测历史砌体中的裂缝。对于带有FBG的集成光纤,观察到了最高的灵敏度和鲁棒性。后两者作为参考技术而被应用,前三者正在作为新颖的应用进行研究。本文讨论了在砌体中使用监测技术的效率,解释了开发的集成程序,并将获得的数据集与在大规模砌体墙测试中获得的变形和裂缝模式相关联。此外,研究了温度波动的影响。事实证明,所开发的配置可有效监测历史砌体中的裂缝。对于带有FBG的集成光纤,观察到了最高的灵敏度和鲁棒性。后两者作为参考技术而被应用,前三者正在作为新颖的应用进行研究。本文讨论了在砌体中使用监测技术的效率,解释了开发的集成程序,并将获得的数据集与在大规模砌体墙测试中获得的变形和裂缝模式相关联。此外,研究了温度波动的影响。事实证明,所开发的配置可有效监测历史砌体中的裂缝。对于带有FBG的集成光纤,观察到了最高的灵敏度和鲁棒性。解释了开发的集成程序,并将获得的数据集与全尺寸砌体墙测试中获得的变形和裂缝模式相关联。此外,研究了温度波动的影响。事实证明,所开发的配置可有效监测历史砌体中的裂缝。对于带有FBG的集成光纤,观察到了最高的灵敏度和鲁棒性。解释了开发的集成程序,并将获得的数据集与全尺寸砌体墙测试中获得的变形和裂缝模式相关联。此外,研究了温度波动的影响。事实证明,所开发的配置可有效监测历史砌体中的裂缝。对于带有FBG的集成光纤,观察到了最高的灵敏度和鲁棒性。

更新日期:2018-02-01
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