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在分析了光纤布拉格光栅(FBG)应变传感及索力测量机理的基础上,根据静力学原理对缆索索身、连接筒、锚固区应变分布进行了分析,提出了一种基于锚固区FBG应变传感的新型缆索索力测量技术,并根据FBG工作稳定性原则,对FBG植入锚固区的位置进行了优化。设计了缩比模型实验,通过将FBG植于3根钢丝几何中心,保证了FBG工作的稳定性。实验结果表明锚固区内FBG所测应变值仅为锚固外FBG所测应变值的62%,且锚固区内部FBG中心波长与拉力值之间呈较好线性关系。证明了锚头内应变逐渐减小理论的正确性及该索力测量方法的可行性。
Based on the analysis of strain sensing and cable force measurement mechanism of fiber Bragg grating (FBG), the strain distribution of cable girdle, connecting cylinder and anchorage zone is analyzed based on the principle of statics. A new method based on FBG strain Sensing the new cable force measurement technology, and according to the principle of FBG stability, the location of the FBG implant anchorage zone is optimized. The experiment of shrinkage ratio model was designed and the stability of FBG work was ensured by implanting FBG into the geometric center of 3 wires. The experimental results show that the strain measured by the FBG in the anchorage zone is only 62% of the strain measured by the anchorage FBG, and the linear relationship between the FBG center wavelength and the tension value in the anchorage zone has a good linear relationship. It is proved that the theory of strain reduction in anchor head is correct and the feasibility of this method is feasible.