Abstract
Recently, the wind turbine generator systems have positively been introduced as one of the clean energy in many countries. This movement spreads even in Japan. The investigation of seismic safety of these systems for level 2 earthquake seems to be an important problem with the extension of the facility popularization. Recently, screw piles which show excellent performance for the drawing resistance have been used in towering structures such as wind turbine generator systems, in which huge overturning moments occurred for wind and earthquake.
In this study, by using characteristics of screw pile confirmed from the experiment conducted by authors, dynamic analysis of this system for the level 2 earthquake ground motions is carried out to clarify the effectiveness of screw piles. The usefulness of the screw piles is examined by comparing with the straight piles.
