ABSTRACT
ABSTRACT: Research on coordinating deformation between Fiber Bragg Grating (FBG) strain sensor and asphalt mixture is of a great importance on the application of FBG strain sensors in asphalt pavement. As a result, evaluation of coordinating deformation between them was discussed in this paper. At first, the viscoelastic characterization of asphalt mixture was performed through uniaxial creep test with dynamic repetitive loading. Then, a 3D finite element model for asphalt mixture beam with FBG strain sensor embedded using ABAQUS software was established to analyze the stress and strain redistribution close to the location of embedded sensor due to the existing of high-modulus FBG sensor, and the effect of sensor modulus on the strain and stress fields of asphalt mixture was also discussed. The result indicates that the existence of high-modulus sensor results in the redistribution of stress and strain fields, but it doesn’t limit plastic deformation development of asphalt mixture; the stress and strain fields are more sensitive to the modulus of inserted sensor, with the decrease of sensor modulus, the influence decreases gradually. Finally, the influence curve of sensor modulus on strain field was obtained, and proposed to modify the measured data from FBG strain sensor.
