2015 Volume 39 Issue 1 Pages A_14-A_21
In this study, a new damping correction factor is proposed to provide accurate design response spectrum. Proposed response spectra show good agreement with those by time history analysis (THA) for both low and high damping ratio. The seismic load of wind turbine tower based on response spectrum method (RSM) is also presented and compared with those by THA. Torsional moment is calculated from acceleration at the top of tower evaluated by RSM and correction coefficient in the formula is proposed by systematic analysis. Moreover, seismic load at foundation is evaluated by Sway-Rocking (SR) model. The quantile value in response spectrum is determined as 0.85 to ensure the reliability level by the calibration with THA currently used for evaluations of seismic load on the wind turbine support structures. The seismic load predicted by RSM is verified by comparison with that by time history analysis.
