Fiber bragg grating shear force sensor and working method thereof

Abstract

The invention discloses a fiber bragg grating shear force sensor and a working method thereof. The fiber bragg grating shear force sensor comprises a plurality of shear force sensors arranged at intervals, each shear force sensor comprises two fixing layers arranged to be parallel to each other, a deformation layer is filled between the two fixing layers, an optical fiber obliquely penetrates through the two fixing layers, and the optical fiber is provide with a fiber bragg grating in the deformation layer. The fiber bragg grating shear force sensor disclosed by the invention has the advantages of overcoming the problem that the traditional strain flower sensor is susceptible to electromagnetic interference and has poor long-term stability; the sensor is small in volume, convenient in construction and paste and high in measurement precision; and multi-point distributed measurement can be performed, and the distribution condition of seismic shear forces at any moment can be measured ina shaking table test of an underground structure.

Description

technical field [0001] The invention belongs to the technical field of civil engineering, and in particular relates to an optical fiber grating shear force sensor and a working method thereof. Background technique [0002] Shear force measurement is a key problem in engineering applications in the fields of structural health monitoring and earthquake engineering of urban underground structures. From the development of seismic response and analysis methods of underground structures at home and abroad, it can be seen that the research on the distribution mode of seismic shear stress around underground structures has not yet made substantial progress. Therefore, how to accurately and reasonably test the shear stress of underground structural components is the key Problems that need to be solved urgently at this stage. [0003] In existing civil engineering, strain rosettes are used to measure shear force, and a large number of strain sensors need to be arranged in a triangle o...

AI Technical Summary

Problems solved by technology

The equipment layout and calculation process are more cumbersome

At the same time, when the number of strain gauges is large, more wires are needed, which inevitably brings the disadvantages of being susceptible to electromagnetic radiation interference, low test accuracy, and poor long-term stability.

In addition, the layout of strain rosettes is limited by the size of the measured object. Based on the influence of the performance parameters of the shaking table, the model test is usually a scaled-down test, and galvanized steel wires are used instead of the stressed steel bars, so that the strain rosettes cannot be fixed more flatly. On the tested body, destroying the integrity of the tested body

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