Design Spectra and Phase Spectrum Modeling to Simulate Design Earthquake Motions : A Case study through Design Standerds of Railway Facilities in Japan

概要

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Design earthquake motions often are defined by response spectra. We introduce three types of design spectra given in the Seismic Design standards for Railway Facilities (1999). Both the amplitude and phase characteristics of earthquake motion provide key information needed to evaluate the aseismic capacity of designed structures. We present a simple method for modeling the phase characteristic of earthquake motion based on group delay time and wavelet analysis. First the phase spectrum is modeled near the source region. Second we develop a method to model the phase spectrum for the inter-plate earthquakes. Existing data sets on observed earthquake motions and wavelet analysis then are used to calculate the group delay time of each earthquake motion on each compact support of Meyer's analyzing wavelet. Regression equations for the mean group delay time and standard deviation on each compact support are obtained as functions of the earthquake's magnitude and epicentral distance. Simulating sample phase spectra earthquake motions compatible with the design response spectra then are simulated, and their characteristics are investigated using ductility demand spectra.
日本自然災害学会の論文