Estimating the dependence of seismic input energy characteristics on its predominant period

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Rubric:     Theoretical and experimental studies   
Annotation:
The paper considers the types of dependencies of the seismic input energy characteristics on input prevailing period. In particular, the types of dependencies for the Arias intensity and the seismic energy density are proposed. In the course of this study, a database including 91 accelerograms of earthquakes with intencity 9 on the MSK scale was used. This database was collected at the Petersburg State Transport University and the University of Petroleum in Qingdao. Parameters of the approximating dependences were calculated by the least squares method. Formal dependencies in the form of polynomials and exponential functions, and dependencies, characteristic for the input in the form of a damped sinusoid were considered. Parameters of the last type of dependencies can have a physical meaning. Studies have shown that some of the input parameters (peak accelerations and velocities, harmonic coefficient) have a clear correlation with the accelerogram prevailing period, and for energy characteristics such relationship is not observed.