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基于光纤布里渊传感的钢绞线全尺度应力监测

期刊名称：压电与声光（EI源，已录用（2009））
时间：0
分类：TN253[电子电信—物理电子学] TV332[水利工程—水工结构工程]
作者机构：[1]哈尔滨工业大学土木工程学院,黑龙江哈尔滨150090, [2]大连理工大学土木水利学院,辽宁大连116024
相关基金：国家自然科学基金资助项目（10672048）
相关项目：重大工程结构健康监测及其集成系统

关键词：纤维增强树脂-光纤复合筋, 布里渊分布式传感, 钢绞线, 全尺度监测, 长期监测, optical fiber-fiber reinforced polymer rebar, Brillouin distributed sensor, smart stranded wire, fulllength monitoring, long term monitoring

中文摘要：

针对钢绞线服役过程中因弯角、摩擦、滑移等原因导致的应力分布式变化及传统传感器不能有效解决分布式测试和工程布设的难题，提出将纤维增强树脂-光纤复合智能筋与钢绞线复合，利用光纤布里渊传感实现钢绞线应力的全尺度监测技术，并通过钢绞线的张拉试验验证了该技术的有效性。试验结果表明，智能筋中的光纤布里渊测试平均应变与引伸计结果吻合较好，反算荷载与控制张拉力吻合亦良好，其误差在5％左右，说明监测信息能很好地揭示钢绞线的应力分布状态。该技术具有抗电磁干扰，耐久性好，长距离全尺度测量，实施方便，成本低等优点，适于钢绞线结构的从施工到服役的全过程长期监测。

英文摘要：

The stress distribution changes a lot along the stranded wire in service due to the bending angle, fric tion, slipping and so on. But unfortunately, by now no traditional sensor is feasible for the issues of both distributed monitoring and installation at the same time. In this paper, a novel smart stranded wire has been developed using optical fiber-fiber reinforced polymer （FRP-OF） rebar to take the place of the core wire of the steel strand. The strain distribution can be given by the Brillouin optical time domain signal, so the stress distribution and loading in formation can be also gotten accordingly. Moreover the force calculation method has also been introduced. To validate this novel idea, the test of the smart stranded wire under static loading has been carried out. The test result shows that FRP-OF can reveal the stress distribution along the wire and the data agree well with that from the extensometer. And the force calculated from the measured data is also reasonable compared with the practical load with error of 5% or so. This novel technique shows perfect advantages such as durability, anti-corrosion, easy installation, electro-magnetic resistance, low cost and fully-distribution sensing and so on, which can meet the long-term monitoring for stranded wire based structures.

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