Crack Opening Estimate of Reinforced Concrete Using Optical Fiber Sensor

The crack width of concrete structure was investigated and discussed in this paper. The paper used a post-processing method to calculate the crack width with a 3D FEM of loaded concrete slab. The FBG stresses of three directions were extracted from the 3D FEM, and then were used to calculate the spectrum distortion of FBG sensor. Experiments were carried out with a FBG sensor installed inside a concrete slab, and the experimental results of crack width of concrete slab were given also. The results demonstrated that the spectrum deformation could be applied as an effective indicator to evaluate the crack width of reinforced concrete.