Fiber Bragg Grating Sensing Combined with Nano-Photocatalyst for Structural Safety of Bridges and Prevention of Environmental Pollution

Abstract

The photocatalytic oxidation technology of nanomaterials has the potential of treating gaseous pollutants. Therefore, the fiber Bragg grating (FBG) macro strain sensor is applied to monitor the health of the bridge. Then, a mesoporous SiO2 adsorbent is taken as the carrier to prepare SiO2@TiO2 nanocomposites with adsorptionphotocatalytic ability, which is utilized in the adsorption test of gas phase toluene pollutants. The results show that FBG macro strain sensors can effectively detect the changes in bridge T beam cracks, curvature, bending stiffness, and deflection. The difference between the deflection value calculated by the conjugate beam method and the measured value of LVDT is small. In addition, the prepared SiO2@TiO2 nanomaterials present a core–shell space structure, and have excellent toluene adsorption and photocatalytic degradation efficiency. In short, the FBG macro strain sensor can be used to monitor the progression of bridge cracks, and the SiO2@TiO2 nanomaterials can realize the enrichment and continuous degradation of gas phase pollutants.