Shaking table tests on a scaled suction bucket jacket foundation to assess the effect of thrust force during earthquake events
Shaking table tests on a scaled suction bucket jacket foundation to assess the effect of thrust force during earthquake events
Shaking table tests were conducted on a 1:47 scale model of a suction bucket jacket (SBJ) to investigate the structural and geotechnical behaviour during seismic events. Tests were undertaken both with and without a thrust force applied to the model to simulate the offshore wind turbine during operational and standstill conditions respectively. An extensive measurement system was installed within a large flexible laminar shear box filled with medium dense sand, which showed that the soil surrounding the buckets reached initial liquefaction during the modelled earthquake event. The test results indicate that thrust force significantly influences both the damping ratio and the inclination of the SBJ, while its effects on the excess pore water pressure response are comparatively minimal. The acceleration responses of the structure indicated a slight decrease in the natural frequency of first-mode vibration when applying the input motion. However, after the excess pore water pressure dissipated, the natural frequency of the first mode vibration recovered. Additionally, the excess pore water inside the buckets during soil liquefaction shown to assist in maintaining stability of the SBJ during these load cases.
Yu Shu Kuo; Hui-Ting Hsu; Michael Harte; Avi Shonberg; Yuhsiu H. Tseng
5th International Symposium on Frontiers in Offshore Geotechnics (ISFOG2025)
11 - Suction installed foundations and anchors
https://doi.org/10.53243/ISFOG2025-104
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