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应变和挠度是判断桥梁健康状况的两个重要指标,但传统测量技术很难准确测量全桥应变和挠度分布,更难建立宏观应变和微观挠度的联系。该文采用几何数值解析法,考虑实际桥梁损伤缺陷,全桥刚度并不均匀统一这一实际情况,配合准分布式FBG光纤传感器,研究梁的几何变形中转角和挠度的关系,提出了几何法间接计算桥梁的挠度,并进行了相关试验论证。理论分析和试验结果证明:FBG光纤传感器有较高的应变测量精度,且由其间接计算得到的挠度误差较小,适用于桥梁应变和挠度的监测。
Strain and deflection are two important indicators to judge the health status of bridges. However, it is very difficult to measure the strain and deflection distribution of full bridges accurately with traditional measurement techniques. It is more difficult to establish the relationship between macro-strain and micro-deflection. In this paper, the geometric numerical analysis method is used to consider the actual bridge damage defect and the stiffness of the whole bridge is not uniform and uniform. In this paper, the quasi-distributed FBG optical fiber sensor is used to study the relationship between the deflection and the deflection in the geometric deformation of the beam. Indirect calculation of the deflection of the bridge, and the relevant test demonstration. The theoretical analysis and experimental results show that the FBG optical fiber sensor has high strain measurement accuracy and less deflection error calculated indirectly. It is suitable for the monitoring of bridge strain and deflection.