چكيده به لاتين
In this research, the seismic response of offshore wind turbines and the effect of the piles used in their foundation on the turbine tower's seismic response have been investigated using numerical method. OpenSees software has been used to consider the conditions of soil saturation and pore water pressure changes. Due to the existence of soil constitutive model, including the PDMY model, it has a good ability to model saturated soil and pore water pressure changes.
For numerical verification, a centrifuge test carried out by Yu et al. was used. This test was carried out on an offshore wind turbine with tripod substructure, with a height of 13 meters and three piles in triangular arrangement with 0.5 meters in diameter and 3 meters in length. In this test, the response of the turbine tower and pore water pressure variations under the earthquake load have been investigated.
After passing the verification stage, through the parametric study, the effect of geometric features of the piles, including distance, length, diameter and number of piles on the seismic response of the offshore wind turbine, has been investigated.
Also, along with the geometric properties of the piles, other influential factors on the seismic response of the offshore wind turbine, such as other environmental loads (wind load and wave load), soil permeability coefficient, and peak ground acceleration (PGA) are considered.
