分布式光纤在混凝土结构裂缝监测中的应用  

Application of distributed optical fiber in the monitoring of cracks in concrete structures

作　　者：叶宇霄 赵新铭[1] 吴刚[2] 谢雪峰[2] 姚剑[2] 

机构地区：[1]南京航空航天大学土木工程系,南京210016 [2]江苏省泰州市水利局,江苏泰州225300

出　　处：《土木建筑与环境工程》2018年第1期24-29,共6页Journal of Civil,Architectural & Environment Engineering

基　　金：江苏省水利科技项目(JS-20140898)~~

摘　　要：分布式光纤在结构健康监测的应用中,定量分析裂缝是难点。裂缝对光纤产生拉伸、弯曲和折角的影响,需要深入研究各因素影响程度。测试光纤角度的频移影响,并对比研究了轴向拉伸造成的频移影响。提出一种基于BOTDA分布式光纤传感的计算公式并将该公式运用于裂缝成像软件中。试验结果表明:在裂缝产生后,光纤角度的变化对试验结果产生较大影响,且考虑角度因素后,裂缝成像更接近真实情况。使用分布式光纤监测混凝土裂缝时,需要考虑角度问题。In the application of distributed optical fiber structure health monitoring,quantitative analysis of cracks is difficult.The effect of tensile,bending and folding on optical fiber and the influence degree of various factors needs to be studied.In this paper,the influence of frequency shift on optical fiber angle is tested and the effect of frequency shift caused by axial tension is compared.A new calculation formula based on BOTDA distributed optical fiber sensing is proposed and applied to crack imaging of software.The experimental results show that the change of the optical fiber angle has a great influence on the experimental results after the crack is generated,and the fracture imaging is closer to the real situation after taking the angle factor into account.Therefore,when using distributed optical fiber to monitor concrete cracks,the angle should be taken into account.

关 键 词：混凝土 裂缝 光纤传感 角度 

分 类 号：TU317[建筑科学—结构工程]