光纤光栅在预应力钢绞线应力测量中的应用  

Application of Fiber Bragg Grating Sensor on Measurement of Tensile Stress in a Seven-Wire Prestressed Steel Strand

作　　者：刘铁根[1] 江俊峰[1] 李欣[2] 李恩邦[1] 刘丽娜[1] 王云新[1] 张以谟[1] 

机构地区：[1]天津大学精仪学院光电信息技术科学教育部重点实验室 [2]天津市建筑科学研究院

出　　处：《光电子．激光》2005年第10期1235-1238,共4页Journal of Optoelectronics·Laser

摘　　要：利用光纤Bragg光栅(FBG)传感器对预应力钢绞线的应力测量进行了研究,通过分析预应力钢绞线的特点确定FBG的安装工艺并进行了试验。试验结果表明,在预应力钢绞线单根钢丝上粘贴FBG基本上可以不受钢绞线结构形式的影响而表征钢绞线的总体应力情况。断裂试验表明,FBG的断裂应变极限为5 457με,因此FBG的传感零点需偏移5 000με。An application of fiber Bragg grating（FBG） in the measurement of tensile stress in a prestressed seven-wire steel strand,which is widely used in various prestressed concrete, is carried out. The character of prestressed steel strand is analyzed, and it is used to decide the install techniques of FBG. A series of experiments are carried out and the results show that FBG can represent the overall stress of prestressed steel strand without being affected by specific structure of strand when it is only fixed on one of wires. The fracture test shows that the maximum strain limit of FBG is 5 457 με, which means the offset of working zero of FBG should at least be 5 000με.

关 键 词：光纤Bragg光栅(FBG) 预应力钢绞线 光纤传感 应力测量 

分 类 号：TN247[电子电信—物理电子学] TN253