基于BOTDR的桥梁斜拉索模拟实验研究  

Research on simulation experiment of bridge stay cables based on BOTDR

作　　者：王帅[1,2] 刘洋 刘家旭 孙晓伟 WANG Shuai;LIU Yang;LIU Jiaxu;SUN Xiaowei(School of Information Science and Technology,Qingdao University of Science and Technology,Shandong Qingdao 266061,China;State Key Laboratory of Coal Resources and Safe Mining(CUMT),Jiangsu Xuzhou 221116,China)

机构地区：[1]青岛科技大学信息科学技术学院,山东青岛266061 [2]中国矿业大学煤炭资源与安全开采国家重点实验室,江苏徐州221116

出　　处：《工业仪表与自动化装置》2021年第5期83-87,共5页Industrial Instrumentation & Automation

基　　金：中国矿业大学煤炭资源与安全开采国家重点实验室开放研究基金资助项目(SKLCRSM20KF006)。

摘　　要：针对传统手段监测特大型桥梁斜拉索结构健康存在的技术缺陷,利用分布式光纤传感技术对桥梁斜拉索实现大范围、远距离的空间连续性监测;通过研究特大桥梁斜拉索的力学特性并与光纤传感器相结合,搭建传感光纤-斜拉索索力监测模型,设计并实施斜拉索索力监测模拟实验,实验中逐渐增加砝码,使模型实验中模拟桥梁斜拉索的形变量逐步增大,观察此过程中光纤传感器的布里渊频移变化;对布里渊频移监测实验数据进行整理分析,通过监测光纤传感器中频移变化量来表征斜拉索索力的变化程度,得出应力光纤传感器中布里渊光纤频移与斜拉索拉力曲线呈线性关系,绘制布里渊光纤频移-斜拉索索力拟合曲线,提出布里渊光纤频移-斜拉索索力关系式,为特大桥梁斜拉索的结构安全健康提供了一种新的监测方式。In view of the technical shortcomings of traditional methods to monitor the health of the stayed cables of super large bridges,the distributed optical fiber sensing technology is used to realize large-scale and long-distance spatial continuity monitoring of the stayed cables of the bridge;through the study of the mechanics of the stayed cables of super large bridges Combine the characteristics with the optical fiber sensor,build the cable force-optical fiber monitoring model,design and implement the cable force monitoring simulation experiment,gradually increase the weight in the experiment,so that the deformation of the simulated bridge cable in the model experiment gradually increases Observe the change of the Brillouin frequency shift of the optical fiber sensor during this process;organize and analyze the experimental data of the Brillouin frequency shift monitoring.By monitoring the change of the frequency shift of the optical fiber sensor,the degree of change in the cable force of the stayed cable is characterized,and the stress is obtained.In the optical fiber sensor,the Brillouin fiber frequency shift has a linear relationship with the stay cable tension curve.The Brillouin fiber frequency shift vs.stay cable force fitting curve is drawn,and the relationship between Brillouin fiber frequency shift and stay cable force is proposed.It provides a new monitoring method for the structural safety and health of the stay cables of super large bridges.

关 键 词：分布式光纤传感技术 斜拉索索力 BOTDR 

分 类 号：TN247[电子电信—物理电子学]