光纤光栅(FBG)传感器具有体小、质轻、灵敏度高、数字化及分布式等诸多优点，非常适合对各种结构用钢绞线的受力监测。然而FBG监测量程小，抗疲劳不足等问题悬而未决。本项目拟以钢绞线全寿命的大应变及疲劳应变FBG监测为目标；提出螺旋凹槽耦合预压粘贴FBG的方法，以提高钢绞线中FBG监测量程及抗疲劳性能；基于剪滞理论、应变传递机制及预应力原理，研究该方法下粘贴材料、粘贴层尺寸、螺旋凹槽角度及预压应力大小等因素对应变传递的影响规律，揭示FBG监测量程扩大和抗疲劳性能增强的机理；利用有限元数值分析，研究螺旋凹槽对钢绞线静力与疲劳性的影响；在理论和有限元分析指导下，研制智能钢绞线并进行静力和疲劳试验。理论、有限元与试验数据相互验证和校正，建立螺旋耦合预压式粘贴型FBG大应变及疲劳应变监理论模型，确立钢绞线应变与FBG波长变化的数学关系，形成钢绞线全寿命的FBG监测技术，以推动其高端智能化的工程应用。

Fiber Bragg grating (FBG) sensor has many advantages, such as small volume, light weight, high sensitivity, digitization and distribution, which is very suitable for the strain monitoring of the steel strand of various structures. However, some problems such as small monitoring range, insufficient fatigue resistance remain to be unresolved. The aim of this project is to monitor the large strain and fatigue strain in the whole life of the steel using FBG sensor. the method of coupling prepressing-paste FBG and spiral groove is put forward to improve the monitoring range and fatigue resistance performance of FBG. Based on shear-lag theory, strain transfer mechanism and the influence of prestress, the law of the influence of the adhesive material, the thickness of the adhesive layer, the angle of the spiral groove and the size of the pre stress on the strain transfer is investigate under this method, to reveal the mechanism of FBG sensor monitoring range expansion and fatigue resistance performance enhancement. Finite element analysis is used to study the effect of spiral groove on the static and fatigue properties of steel strand. Afterwards, the intelligent steel strand is developed and the static and fatigue tests are carried out under the guidance of the theory and the finite element analysis. By means of mutual verification and correction of theory, finite element and test data, Large strain and fatigue strain monitoring model of spiral coupled with prepressing-paste type FBG are established and the mathematical relationships between the strain of steel strand and the wavelength of FBG sensor are built. Finally, the perfect technology of FBG sensor monitoring the stress state of steel strand in its whole life cycle is formed, which can promote the high quality and intelligent engineering application of the steel strand.