Strain Transfer Analysis of the Embeddable GFRP-Packaged FBG Sensors Considering the Elastoplasticity of the Concrete Host
The strain transfer loss introduced by the packaging layer of the industrialized FBG sensor often makes it has strain transfer error,so it is necessary to conduct strain transfer analysis.Most previous studies focus on strain transfer analysis when the host layer is linearly elastic,but the strain transfer law of concrete structures after elastic-plastic deformation is still unclear.The strain transfer anal-ysis on the embedded GFRP-FBG sensor considering the concrete's nonlinear elastic constitutive relationship is conducted,and the strain transfer relationship between the host material and FBG is derived.The validity of the theoretical derivation is verified by finite el-ement simulation.Based on theoretical analysis,the effects of concrete elastoplastic evolution,concrete mark,the radius of the sensor,and gauge length on strain transfer efficiency are discussed,and the size design of the GFRP-FBG sensor is analyzed.The results show that the average strain transfer rate changes little in the elastic stage of concrete but decreases significantly in the plastic stage.Moreo-ver,the concrete mark,the sensor radius,and the gauge length all have a significant impact on the strain transfer efficiency of the sen-sor.This research can be widely used for strain transfer error modification and the design of embedded FBG sensors.
optical fiber sensingembedded fbg sensorstrain transferelastoplasticity of concretetheoretical analysis
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