应用光纤Bragg光栅测量混凝土结构内部应变

采用与土木工程施工特点相适应的传感器安装工艺与保护方法, 将光纤B ragg 光栅(FBG) 埋于正在建设的呼兰河大桥预应力箱梁中, 测量了预应力张拉过程中混凝土结构内部的应变变化。结果表明,FBG 显示了良好的传感性能, 能够监测混凝土内部应变状态, 发挥出成活率高、绝对值测量和寿命长等优势, 为建立结构健康监测系统奠定了基础。
关键词: 光纤B ragg 光栅(FBG) ; 应变; 传感器; 预应力
Abstract: F iber B ragg grat ing (FBG) st rain senso rs w ere characterized and embedded into the p re2 st ressed concrete beam of HuL an river bridge. Embedding techniques and p ro tect ivemethods suitable fo r civil engineering w ere p resented. W ith FBG senso rs, internal st rains of the concrete beam w ere deter2 m ined during the st ressing p rocess. FBG senso rs show the advantages of st rong surviving capability, ab2 so lute value measurement and long service life over convent ional elect rical st rain gauge in experiments. The results indicate that it is po ssible to establish a st ructural health monito ring system based on fiber op t ic senso rs.
Key words: F iber B ragg Grat ing (FBG) ; St rain; Senso r; P rest ress