• Polski
  • English

Application of Distributed Optical Fibre Sensor for Strain and Temperature Monitoring within Continuous Flight Auger Columns

Application of Distributed Optical Fibre Sensor for Strain and Temperature Monitoring within Continuous Flight Auger Columns

Distributed optical fibre technology provides new possibilities in structural health monitoring in comparison with traditional spot measurements because it allows measuring selected physical quantities continuously over structural member length.  The spatial resolution can start from as fine as 5 mm when using advanced optical reflectometers based on the principle of Rayleigh scattering.  The quality of information obtained about structural condition is especially important for geotechnical applications because there are many uncertainties regarding the theoretical model describing the cooperation between the foundations and the substrate as well as including the values of physical parameters. Moreover, the geometry of structural members (e.g. the diameter of the column) can be very different from design assumptions and vary along the depth depending on technology of execution. In the presented case study the analysis of continuous flight auger (CFA) column was described based on the strain and temperature measurements carried out continuously over the length of 12 m using EpsilonRebar sensors. The measurements were done during the load tests, but also in the early-age concrete, when thermal-shrinkage strains appeared.

Read more