A Modification Method of Earthquake Ground Motion with High Precision from Fitting the Multi-damping-ratio Target Spectrum
Jun Yuan · Northwestern Seismological Journal · 2011
According to the measure index for modification effect of ground motion,both advantages and disadvantages of two methods which called Time Domain Synthesis(TDS) and Time-Frequency Analysis(TFA) are compared.Based on the calculation of quantitative relationship between Arias Intensity and absolute acceleration response spectrum,a new method combined TDS and TFA is proposed for fitting multi-damping-ratio design target spectrum.The results indicate that the new method can retain the strong non-stationary characteristic of earthquake ground motion and decrease the change of real phase difference spectrum.The simulation results of D-V-A combined spectrum shows the new method is practicable and takes precedence over the traditional methods in accuracy.