不锈钢管智能筋在钢筋混凝土结构应变监测中的应用

Application of Stainless Steel Tube Intelligent Reinforcement in Strain Monitoring of Reinforced Concrete Structures

为解决光纤传感器易损、测量结果易受外界因素干扰以及布设存活率较低等问题,文章依据布里渊散射原理,基于BOTDA传感技术,通过不锈钢管封装紧皮光纤,自行研制具有监测距离长、精度高、全分布式、耐久性强等优点的不锈钢管智能筋。不锈钢管智能筋具有制备快捷的优点。通过标定不锈钢管智能筋和FRP智能筋的温度和应变灵敏系数进行分析,发现两种智能筋具有良好的温度与应变感知性能;解析试验梁应变监测数据,进行对比分析发现自制不锈钢管智能筋与FRP智能筋的应变监测精度相同,且不锈钢管智能筋的应变监测稳定性优于FRP智能筋。试验结果表明自行研制的不锈钢管智能筋能够解决光纤在粗狂式监测环境中易损的问题,同时具有监测精度高、稳定性好等优点,可对钢筋混凝土结构进行全尺度大范围的监测。

In order to solve the problems such as the vulnerability of optical fiber sensors,the susceptibility of measurement results to external factors,and the low deployment survival rate,based on the Brillouin scattering principle and the BOTDA sensing technology,a stainless steel tube intelligent reinforcement with the advantages of long monitoring distance,high accuracy,full distribution,and strong durability was developed.By calibrating the temperature and strain sensitivity coefficients of stainless steel tube intelligent reinforcement and FRP intelligent reinforcement,it was found that the two types of intelligent reinforcements have good temperature and strain sensing performance;after analyzing the strain monitoring data of the test beam,it was found that the strain monitoring accuracy of the self-made stainless steel tube intelligent reinforcement was the same as that of the FRP intelligent reinforcement,and the strain monitoring stability of the stainless steel tube intelligent reinforcement was better than that of the FRP intelligent reinforcement.The test results showed that the self-developed stainless steel tube intelligent reinforcement can solve the problem of optical fiber vulnerability in rough monitoring environments,and has the advantages of high monitoring accuracy and good stability,which can be used for full-scale and large-scale monitoring of reinforced concrete structures.