81011566

open access

Version of Record

サイト増幅特性のばらつきを考慮した強震動のばらつきの評価

Stochastic characteristic of site amplification factor and its effect on earthquake ground motion

Japanese (日本語)

神戸大学都市安全研究センター研究報告

22

26-44

神戸大学都市安全研究センター

2018-03

2019-05-30

Seismic risk analysis on social infrastructure is important in earthquake prone areas. Seismic risk analysis is usually conducted by the convolution of seismic hazard function and structural fragility function. Seismic hazard curve, in general, is expressed as the representative value of earthquake ground motion such as peak ground acceleration corresponding to the annual probability of exceedance. The representative value, however, lacks information on the frequency characteristic of the earthquake ground motion. Earthquake ground notion is expressed by the multiplication of source characteristic, path characteristic and site amplification characteristic in the frequency domain. Although the source and path characteristics can be evaluated analytically, site amplification characteristic can only be evaluated precisely in an empirical manner by using the strong motion record because site amplification characteristic is strongly affected by the sedimentary environment of soil layers at the site of interest. Little study on the stochastic characteristic of site amplification factor has been done so far. In this study, authors evaluated the stochastic characteristic of site amplification factor by the spectral analysis on the strong motion records observed at two sites: reference site and target site. Variation of there presentative value of earthquake ground motion such as peak ground acceleration and peak ground velocity considering the variation of site amplification factor is discussed .

ばらつき

紀要論文