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首页> 外文期刊>Engineering Structures >Natural frequencies identification of a reinforced concrete beam using carbon nanotube cement-based sensors
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Natural frequencies identification of a reinforced concrete beam using carbon nanotube cement-based sensors

机译：使用碳纳米管水泥基传感器识别钢筋混凝土梁的固有频率

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摘要

Cementitious materials doped with carbon nanoparticles are robust materials capable of transducing strain into changes in electrical resistance. These properties encourage the development of spatially distributed sensors for structural health monitoring of concrete structures. Yet, very few applications of transducers made of cement-based nanocomposir.es to structural elements have been documented. The majority of applications are limited to measurement of static responses. The authors have recently proposed the novel application of cement-based nanocomposite technologies for vibration-based structural health monitoring of concrete structures. To this aim, prismatic sensors made of cement paste doped with carbon nanotubes have been proposed as embedded sensors for concrete structures. Prior results have shown the promise of these sensors at vibration measurements. In this paper, the authors further the understanding of the dynamic behavior of cement-based carbon nanotube sensors by conducting experiments on a full-scale reinforced concrete beam for output-only identification of natural frequencies. The performance of the novel sensor is benchmarked against off-the-shelf strain gauges and accelerometers. Results show that the proposed sensor compares well against existing technologies at vibration monitoring. Also, the nanocomposite sensor is capable of detecting high frequencies, which is made possible by a very low level of noise and an excellent signal-to-noise ratio obtained from shielded wire connections and proper tailoring of the fabrication process.
机译：掺杂有碳纳米颗粒的胶凝材料是能够将应变转换为电阻变化的坚固材料。这些特性鼓励开发用于混凝土结构的结构健康监测的空间分布传感器。然而，已经记录了由水泥基纳米复合材料制成的换能器在结构元件上的极少应用。大多数应用限于静态响应的测量。作者最近提出了水泥基纳米复合材料技术在混凝土结构基于振动的结构健康监测中的新应用。为此，已经提出了由掺有碳纳米管的水泥浆制成的棱柱形传感器作为用于混凝土结构的嵌入式传感器。先前的结果表明了这些传感器在振动测量中的前景。在本文中，作者通过在大型钢筋混凝土梁上进行实验以仅识别固有频率来进一步了解水泥基碳纳米管传感器的动态行为。新型传感器的性能以现成的应变仪和加速度计为基准。结果表明，所提出的传感器在振动监测方面可与现有技术很好地比较。而且，纳米复合材料传感器能够检测高频，这是由于极低的噪声水平以及从屏蔽线连接和适当调整制造过程中获得的极佳信噪比而实现的。

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