On the Relationships Between the Fundamental Parameters of Calculation Accelerograms

Abstract

Analysis of published data on the fundamental parameters of actual accelerograms of strong earthquakes having peak ground acceleration A_max, predominant period T_pr, and duration τ_0.5 at 0.5A_max determined that, for earthquakes of intensity greater than 6.5 – 7.0, the relationship between these quantities is sufficiently well described by the parameters B = ATτ and C = AτT^−1.338, the former of which depends little on earthquake intensity I and is almost completely determined by the earthquake magnitude, while the latter, on the contrary, weakly depends on magnitude and is determined principally by the quantity I. Methods are proposed for using the parameters B and C to improve the reliability of determining parameters of accelerograms used to calculate the seismic resistance of hydraulic engineering facilities.