基于BOTDA的钢筋应力实时监测方法  

Study on real-time reinforcement stress measurement based on Brillouin optical time domain analysis

作　　者：何勇[1] 邢锋[2] 毛江鸿[1] 金伟良[1] 

机构地区：[1]浙江大学结构工程研究所,杭州310058 [2]深圳大学土木工程学院,深圳518060

出　　处：《深圳大学学报（理工版）》2010年第3期291-295,共5页Journal of Shenzhen University(Science and Engineering)

基　　金：国家高新技术研究发展计划资助项目(2004AA602210; 2006AA09A109);深圳市土木工程重点实验室资助项目(SZDCCE09-14)~~

摘　　要：提出一种将分布式应变传感光纤技术用于钢筋混凝土中钢筋应力监测的方法,能在较短施工期内将分布式光纤传感器准确埋入混凝土内部,对钢筋的应力水平进行长期实时监测,确定混凝土结构的工作水平,更好地预测结构的耐久性.分析传感光纤应变与钢筋应变的转化关系,为提高分布式传感器的空间分辨率,提出盘绕方式的光纤黏结方法,对盘绕弯曲曲率的影响进行分析.通过简支梁的全过程受力试验,比较了传统应变片和分布式传感光纤的测量结果,并对光纤不同的黏结方式进行对比,验证了该方法的可行性和有效性.A new method to monitor reinforcement stress is proposed. The distributed optical fiber can be rapidly laid into the concrete. The new method is feasible to evaluate structure performance because it can carry out stable, long-term, real-time reinforcement stress measurement. The measurement of the stress of reinforced bar can give more correct assessment of the durability of concrete structures. In order to increase the spatial resolution, the coil method of fiber felt is developed. The influence of radius of curvature of fiber is studied. The measurements of strain-gage transducer and the optical fiber are compared through tests of a beam. The results show the proposed method is feasible and valid.

关 键 词：材料力学 钢筋应力监测 钢筋混凝土耐久性 分布式光纤传感器 布里渊光时域分析技术 钢筋锈蚀 

分 类 号：TU317[建筑科学—结构工程]