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使用光纤传感器检测钢结构中的裂缝

乔丹队的机械工程师LightWave部门

Steel_Bridge.

根据美国土木工程师协会(ASCE)的2013年报告卡为美国的基础设施,汇款中的四个桥梁在结构上是“无论是缺乏或功能讨论的”。It is approximated that $3.6 trillion is needed to improve the United States’ current infrastructure grade of D+ to an average grade of B. Infrastructure management teams require more detailed information about structural performance, yet current rating systems rely heavily on visual inspections, which can be highly variable and lead to inaccurate assessments. In a paper published by members of ASCE in the Journal of Engineering Mechanics, distributed fiber optic strain sensors were used to monitor and identify simulated cracking and distributed deterioration on steel specimens designed to simulate components of bridges. Strain measurements were taken with aLuna OBR 4600.系统。OBR 4600能够将应变测量值下降到2 mm的空间分辨率,用于高达70米的测量范围。在这项工作中,它用于沿着光纤传感器每10mm报告感测点。然后将这些测量与样本的箔片和数值有限元模型进行比较,显示出优异的相关性,如下图所示。

finite_element_modeling.

本文报告了光纤传感器可用于精确地检测钢结构中的裂缝和测量变化应变场。使用这些传感器的能力本地化和检测关键桥接组件的恶化可以帮助解决我们目前缺陷的桥梁基础设施面临的一些安全问题。完整的纸张可从ASCE库中获得,可以在线访问这里。有关Luna的光纤传感解决方案的更多信息,请访问感应我们网站的一部分。***出版参考:Hoult,N.,Ekim,O.和Regier,R。(2014)。使用分布式光纤应变传感器的钢结构损伤/劣化检测。J. Eng。MECH。,140(12),04014097.顶部图片:Matthew Field的“波特兰俄勒冈州钢铁桥全景”。在GFDL 1.2下获得许可Wikimedia Commons.