灵敏度可调FBG应变传感器在桥梁监测中的应用  

Application of Sensitivity Adjustable FBG Strain Sensors in Bridge Monitoring

作　　者：覃荷瑛[1,2] 倪敏 QIN Heying;NI Min(Guangxi Engineering Research Center of Intelligent Structural Material,Guilin University of Technology,Guilin Guangxi 541004,China;Guangxi Key Laboratory of Geotechnical Mechanics and Engineering,Guilin University of Technology,Guilin Guangxi 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,广西桂林541004 [2]桂林理工大学广西岩土力学与工程重点实验室,广西桂林541004

出　　处：《铁道建筑》2023年第9期69-74,共6页Railway Engineering

基　　金：国家自然科学基金(51768014);广西创新驱动发展专项(桂科AA20302006);广西科技计划项目(桂科AD20159085)。

摘　　要：为解决传统光纤布拉格光栅(Fiber Bragg Grating,FBG)应变传感器的灵敏度固定、监测量程有限的难题,设计了一种两端夹持式、灵敏度可调的FBG应变传感器。通过改变两支座固定件中点间的距离与光纤在两夹持杆的粘贴点之间距离的比值实现灵敏度可调。以桂林市南洲大桥为工程背景,将FBG应变传感器应用于钢筋混凝土受弯试验梁中,验证梁体受弯过程中应变传感器的监测效果。监测结果表明:FBG应变传感器存活率高,满足结构构件应变状态监测的需求,跟随性和稳定性良好,可为维护施工期的桥梁健康监测提供依据。To solve the problem of fixed sensitivity and limited monitoring range of traditional fiber Bragg grating(FBG)strain sensors,a FBG strain sensor with adjustable sensitivity and clamped at both ends was designed.The sensitivity can be adjusted by changing the ratio of the distance between the midpoints of the two fixed supports and the distance between the fiber optic attachment points on the two clamping rods.Taking the Nanzhou bridge in Guilin as the engineering background,FBG strain sensors were applied to reinforced concrete bending test girders to verify the monitoring effect of strain sensors during the bending process of the girder.The monitoring results indicate that the FBG strain sensor has a high survival rate,meets the requirements for monitoring the strain status of structural components,has good follow-up and stability,and can provide a reference basis for maintaining bridge health monitoring during construction.

关 键 词：城市桥梁 灵敏度可调 现场试验 应变传感器 光纤光栅 健康监测 

分 类 号：U448.15[建筑科学—桥梁与隧道工程]