Seismic Sesponse of Wind Turbines Supported by RC Mono-Pile in Liquefied Soil

Recent growth in the construction of wind farms with concrete piles in seismic areas with liquefaction potential has necessitated the evaluation of the seismic performance of these structures. In this paper, the effect of liquefaction on the seismic response of wind turbines supported by reinforced concrete mono-pile is investigated. Nonlinear dynamic analysis has been performed by finite element method in OpenSees software. Beams on a nonlinear Winkler foundation method was applied. The responses of reinforced concrete mono-pile foundation was studied for two sets of far and near field earthquake record and four different groups were considered for liquefied sandy soils with different coefficients of internal friction, shear wave velocity, relative compaction percentage and porosity. The results showed that with increasing the coefficient of internal friction and soil compaction rate, the amount of excess pore pressure of the soil adjacent to the RC mono-pile decreases. Also, as the thickness of the liquefied layer increases, the pressure of the extra pore water around the mono-pile will decrease but the displacement of the mono-pile will increase