基于光纤光栅传感器的支撑结构热力解耦测试

Thermal Decoupling Test of Support Structure Based on Fiber Grating Sensors

摘要:

针对支撑结构在载荷作用下产生轴力变化而影响结构安全性的现象，提出了应用光纤布喇格光栅传感器进行支撑结构状态监测方法。通过载荷设计、传感器安装、多路传感器监测、应变数据处理及热力解耦与修正，实现了结构应变状态与轴力的实时监测。试验结果说明，当温度变化超过 10 ℃时，测量应变与载荷变化吻合较好。轴力计算结果与人工测量方法的误差低于 8%，验证了应变修正方法的正确性。该方法可满足气温动态变化环境下支撑结构轴力监测的需求，为土木领域相关研究提供了重要的试验参考。

Abstract:

A method for monitoring the state of support structures using fiber Bragg grating sensors is proposed to address the phenomenon of axial force variation affecting structural safety under loading conditions. By incorporating load design， sensor installation， multi-sensor monitoring， strain data processing， and thermal decoupling and correction， real-time monitoring of structural strain states and axial forces is realized. Experimental results demonstrate good correspondence between measured strain and load changes when the temperature exceeds 10 ℃ . The error in axial force calculation when compared to manual measurement methods is less than 8%， validating the accuracy of the strain correction approach. This method can meet the demand for monitoring axial forces in support structures under dynamic temperature variations， providing an important experimental reference for related research in civil engineering.