光纤光栅索力传感器的酸碱耐久性  

Acid-base Durability of Fiber Bragg Grating Cable Force Sensor

作　　者：覃荷瑛[1,2] 祝健强 李纯德 罗伯光[1,2] QIN He-ying;ZHU Jian-qiang;LI Chun-de;LUO Bo-guang(Guangxi Engineering Research Center of Intelligent Structural Material,Guilin University of Technology,Guilin 541004,China;Guangxi Key Laboratory of Geotechnical Mechanics and Engineering,Guilin University of Technology,Guilin 541004,China)

机构地区：[1]桂林理工大学广西壮族自治区智慧结构材料工程研究中心,桂林541004 [2]桂林理工大学广西岩土力学与工程重点实验室,桂林541004

出　　处：《科学技术与工程》2024年第20期8606-8614,共9页Science Technology and Engineering

基　　金：国家自然科学基金(52068014);广西创新驱动发展专项(桂科AA20302006);广西重大科技创新基地建设(2018-242-G02)。

摘　　要：拉索作为斜拉桥的主要受力构件常处于复杂、恶劣的工作环境,传统的索力监测手段存在一定的局限性。将光纤光栅传感器内嵌封装进金属承压块上的凹槽,研制一种光纤光栅索力传感器,并对两种环氧树脂胶黏剂封装的光纤光栅索力传感器在酸碱腐蚀环境下的耐久性能进行研究,然后依托逆幂律模型与老化动力学理论,推导出传感器寿命预测方程。试验结果表明:该传感器的线性度和稳定性良好,传感器在腐蚀溶液中失效的主要原因是封装部位界相区胶黏剂受腐蚀剥落。A类传感器的耐酸碱性强于B类传感器,A类传感器在弱酸弱碱环境中的使用寿命均超过35年,大于斜拉桥拉索平均20年的换索年限,可以实现拉索全生命周期的监测。As the main force-bearing component of cable-stayed bridges,cables are often in complex and harsh working environments,and traditional cable force monitoring methods have certain limitations.A fiber grating cable force sensor was developed by encapsulating the fiber grating sensor embedded into the groove on the metal pressure block,and the durability performance of two epoxy resin adhesive encapsulated fiber grating cable force sensors in the acid and alkali corrosion environment was studied,and then the sensor life prediction equation was derived by relying on the inverse power law model and aging kinetic theory.The test results show that the sensor perform well on the linearity and stability,and the main reason for the failure of the sensor in the corrosion solution is the corrosion and peeling of the adhesive in the boundary zone of the package site.The acid and alkali resistance of class A sensors is stronger than that of class B sensors,and the service life of class A sensors in weak acid and weak alkali environments is more than 35 years,which is longer than the average cable change life of cable-stayed bridge cables of 20 years,and can realize the monitoring of the whole life cycle of cables.

关 键 词：索力监测 光纤光栅传感器 酸碱腐蚀 寿命预测 

分 类 号：TU375[建筑科学—结构工程]