Effect on soil damping of average or initial static shear stresses and potential impact on foundation performance for offshore structures
Effect on soil damping of average or initial static shear stresses and potential impact on foundation performance for offshore structures
Soil damping contributes to the overall damping to offshore structure foundations during both installation and operation. Soil material damping is normally presented together with shear modulus reduction versus cyclic shear strain. The most important parameters affecting soil material damping are the cyclic shear strain, plasticity index, number of load cycles, effective overburden stress, over-consolidation ratio and loading frequency. Due to the importance of foundation damping for offshore wind structures, it is important to evaluate soil damping based on cyclic load tests with an average/pseudo-static shear stress in combination with cyclic stresses, such as those imposed by structural wind and wave loading. We present how the average shear stress affects the strain and damping on an element level. Specifically, the examples in here show the average shear stress has a stiffening effect causing a smaller cyclic strain amplitude due to less stress reversal.
Joergen Johansson; Harun Kursat Engin; B. D. Carlton
5th International Symposium on Frontiers in Offshore Geotechnics (ISFOG2025)
9 - Monopile design to cyclic loads: quasi-static, dynamic and seismic loads
https://doi.org/10.53243/ISFOG2025-634
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