長周期長時間地震動を含む強震記録に基づく応答スペクトルとエネルギースペクトルの関係

Abstract

In this paper, the damping function is defined as the ratio of the pseudo velocity response spectrum to the energy spectrum. We have examined the applicability of the damping functions presented in previous studies to longer periods and longer duration using recent records including long-period and long-duration ground motions. We have developed new damping functions for long-period and long-duration strong motions. Using the new damping functions, we have showed a method for estimating the energy spectrum from the pseudo velocity response spectrum and have showed the estimated energy spectra correspond to the observed energy spectra regardless of the period ranges.

Damping correction formula considering the period‐dependent characteristics of the design response spectra of long‐period ground motions for the hypothetical Nankai Trough earthquake: An investigation of the simplified spectra and waveform example provided by the Ministry of Land, Infrastructure, Transport and Tourism

“…Oana et al 7 proposed a DCF that quantitatively evaluates the effect of the duration of ground motions based on observational LGM records from the same perspective as that of adopted by Akiyama and Kitamura 8 . In addition, Oana 9 developed a method to evaluate the energy spectrum at a specific point of a hypothetical earthquake using the duration of the observational records, and the method is generally applicable to LGMD waveform examples.…”