Abstract When using distributed optical fibers for structural health monitoring, in order to ensure the survival rate of the optical fibers, it is usually necessary to insert the optical fibers into the structure for protection. The coupling performance between the optical fibers and the structure determines the accuracy of the monitoring results. In order to explore the strain transfer law of optical fibers in structures, a strain transfer model based on shear lag theory was established. From analyzing the strain transfer mechanism of optical fibers in structures, the expression of strain transfer efficiency of optical fibers was deduced and the accuracy of the deduced results was verified by comparing with the numerical results. Based on BOFDA technology, two groups of loading tests were carried out to test the strain transfer effect of distributed optical fibers embedded in the test beam. The results have shown that the two ends of the structure were low-efficiency strain transfer zones of optical fibers, which could not fully transfer the strain of the test beam. The middle part of the structure was high-efficiency strain transfer zone of optical fibers, which could completely transfer the strain of the structure. The experimental results were basically consistent with the theoretical deduction. The above research can provide reference for the application of distributed optical fiber technology in engineering structure monitoring.

中文翻译：

---

混凝土结构分布式光纤传感器应变传递模型的建立与测试研究

摘要 使用分布式光纤进行结构健康监测时，为了保证光纤的成活率，通常需要将光纤插入结构中进行保护。光纤与结构之间的耦合性能决定了监测结果的准确性。为探究光纤在结构中的应变传递规律，建立了基于剪力滞理论的应变传递模型。通过分析光纤在结构中的应变传递机理，推导了光纤应变传递效率的表达式，并通过与数值计算结果的对比验证了推导结果的准确性。基于BOFDA技术，进行了两组加载试验，测试嵌入测试梁的分布式光纤的应变传递效果。结果表明，该结构的两端是光纤的低效率应变传递区，不能充分传递测试光束的应变。结构中部为光纤高效应变传递区，可完全传递结构应变。实验结果与理论推论基本一致。上述研究可为分布式光纤技术在工程结构监测中的应用提供参考。不能完全传递测试梁的应变。结构中部为光纤高效应变传递区，可完全传递结构应变。实验结果与理论推论基本一致。上述研究可为分布式光纤技术在工程结构监测中的应用提供参考。不能完全传递测试梁的应变。结构中部为光纤高效应变传递区，可完全传递结构应变。实验结果与理论推论基本一致。上述研究可为分布式光纤技术在工程结构监测中的应用提供参考。