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设计了一种在钢绞线中心丝上设置凹槽、在中心丝张拉持荷状态下于凹槽中嵌入光纤光栅(FBG)传感器的智能钢绞线,使FBG传感器在服役前产生一定的压应变,以解决FBG传感器封装存活率低以及监测量程不够的问题。理论分析了嵌入式FBG传感器与基体之间的应变传递率,对凹槽的截面尺寸、传感器的黏结长度以及封装材料的弹性模量提出了设计要求。以中心丝持荷值为变化参数,对FBG智能钢绞线进行不同监测量程的张拉实验。结果表明,实验数据具有良好的线性度和重复性;当中心丝持荷值达到中心丝极限承载力的30%以上时,FBG传感器的监测量程接近钢绞线的极限张拉力,从而实现对钢绞线全生命周期的监测。
A kind of smart strand with FBG sensor embedded in the groove with a groove on the center wire of the strand was designed to produce a certain amount of FBG sensor before service Compressive strain to solve the problem of low survival rate of FBG sensor package and insufficient monitoring range. The strain transfer rate between the embedded FBG sensor and the substrate is analyzed theoretically, and the design requirements for the cross-sectional dimension of the recess, the bonding length of the sensor and the elastic modulus of the encapsulating material are proposed. Taking the load value of the center wire as the parameter of variation, the tension test of different monitoring range of FBG smart strand was carried out. The results show that the experimental data have good linearity and repeatability. When the load of the center wire reaches more than 30% of the ultimate load of the center wire, the monitoring range of the FBG sensor is close to the ultimate tension of the steel wire, Stranded wire full life cycle monitoring.