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首页> 外文期刊>Structural Control and Health Monitoring >Structural health assessment of historical timber structures combining non-destructive techniques: The roof of Giotto's bell tower in Florence
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Structural health assessment of historical timber structures combining non-destructive techniques: The roof of Giotto's bell tower in Florence

机译：结合无损技术对历史木结构进行结构健康评估：佛罗伦萨乔托钟楼的屋顶

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摘要

Examining the timber structure supporting the roof of Giotto's bell tower in Florence, this paper discusses the combination of non-destructive (NDT), wave-based methods for the characterization of timber structural elements. In particular, it analyses the on-site applicability of selected wave-based techniques for the identification of decay, damage, defects, and moist areas in structural timber. The applied NDT techniques are IR termography, microwave reflectometry, time-of-flight tomography, and mapping by means of elastic waves. Experimental results are compared with data obtained by means of consolidated NDT techniques, such as the electric resistance method for moisture content estimation and the drill-resistance test for decay characterization. These can be considered non-destructive, although they are invasive. The wave-based NDT methods are found to be a value-added complement to routine methodologies for a holistic diagnosis of timber members. Normal practice based on visual inspection, decay detection through point measurements of drill resistance, and moisture content estimation through local readings of electric resistance, can be substantially improved through full-field, multi-sensor, multi-resolution imaging. Nevertheless, while the diverse NDT methods illustrated here can be useful for screening large areas in a completely non-invasive way, local measurements (i.e., the drill resistance and the electric resistance measurements) are still necessary.
机译：通过检查支撑佛罗伦萨Giotto钟楼屋顶的木材结构，本文讨论了结合无损（NDT），基于波的方法表征木材结构元素的方法。特别是，它分析了选定的基于波的技术在现场识别结构木材中的衰减，损坏，缺陷和潮湿区域的适用性。所应用的无损检测技术为红外热成像，微波反射仪，飞行时间层析成像和借助弹性波的测绘。将实验结果与通过综合无损检测技术获得的数据进行比较，例如通过电阻法进行水分含量估算以及通过钻孔电阻测试进行衰减表征。尽管它们是侵入性的，但可以认为它们是非破坏性的。发现基于波的无损检测方法是对木材构件进行整体诊断的常规方法的增值补充。通过目视检查，通过钻头电阻的点测量进行衰减检测以及通过电阻的本地读数估算水分含量的常规做法可以通过全视野，多传感器，多分辨率成像得到显着改善。然而，尽管这里示出的各种无损检测方法可以以完全非侵入性的方式用于筛查大面积，但是仍然需要局部测量（即，钻电阻和电阻测量）。

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