Using fibre Bragg grating sensors to estimate the horizontal response of a monopile in geotechnical centrifuge

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Abstract

A 50-mm-diameter circular aluminium tube was instrumented with two optical fibres that consist of 13 Fibre Bragg Grating sensors (FBGS) for each. The performance of the FBGS was evaluated by applying a series of increasing transversal loads at 1×g level and comparing the strains measured by FBGS with those calculated from the Euler-Bernoulli beam theory. Centrifuge test was then conducted at 100×g to estimate the transversal response of the calibrated model pile that had been jacked 450 mm into saturated sand and horizontally loaded at 500 mm above the ground. The profiles of the normal strain, bending moment, soil reaction and pile deflection were measured or determined, allowing to construct the soil reaction – pile deflection (P-y) curves. The results confirmed the reliability of the FBGS at 100×g by giving satisfactory measurements on bending moments and coherent measurements on shear force at the ground level.

Details

Original languageEnglish
JournalInternational Journal of Physical Modelling in Geotechnics
Publication statusE-pub ahead of print - 21 Nov 2019
MoE publication typeA1 Journal article-refereed

    Research areas

  • Centrifuge, Monopile, Transversal loading, fibre Bragg gratings sensors, Sand

ID: 39778169