光纤检测钢管混凝土界面脱空模型的试验研究

Study on Model Experiment of Optical Fiber Sensing Disengaging at Interface of Steel Tube-Confined Concrete

通过分布式光纤传感技术可以实现对钢管混凝土界面脱空的检测,这对于这种组合结构的安全检测来说具有重要意义。本文讨论了脱空产生成因及分布式传感光纤实现脱空检测的机理,提出了在钢管中分布式传感光纤的布置形式,并进行了模型试验,得到重要规律,拟合出光衰减与脱空开度关系的曲线及公式。

Sensing of disengaging at interface of steel tube-confined concrete, which now can be realized by distributed optical fiber sensing, is important for structure safety. In the paper, the cause of disengaging forming, as well as principle of optical fiber sensing, are discussed. Besides, the layout of sensing fiber in steel tube is put forward, and some important rules are achieved from model experiment. In addition, we get the relation ship of optical loss and disengaging value.