Frequency Response Characteristic of a Flexible FBG Sensing Beam for Measuring Dynamic Lateral Displacement of Soil in Shaking Table Tests

Flexible fiber Bragg grating (FBG) sensing beams are used to measure dynamic shear response of liquefied soil to ground motions in a shaking table test. Measurement systems typically consisting of bulky arrays of sensor bundles can be instead. But the different frequency response characteristics between the soil and beam generate testing errors. In this work, the sensing beam method is introduced, and the frequency response of the sensing beams will be obtained in an experiment on a shake table.