Journal of Japan Society of Civil Engineers, Ser. A1 (Structural Engineering & Earthquake Engineering (SE/EE))
巻
75
号
4
ページ
I_373 - I_382
発行年
2019
ISSN
2185-4653
DOI
10.2208/jscejseee.75.I_373
出版者
土木学会 Japan Society of Civil Engineers
抄録
本研究では震度増分を精度良く評価するための基礎的な情報を得ることを目的として，震源スペクトルやサイト増幅特性の震度増分への影響を調べた．まず，地震動スペクトルと地盤増幅度の関係式に基づき，震度増分の評価式を求めた．続いて，得られた評価式を用いて，3つの地震タイプ，様々なマグニチュード，高域遮断振動数，サイト増幅特性に対する震度増分を計算した．サイト増幅特性の1次ピーク振動数と震度増分の関係を調べた結果，3つの地震タイプともマグニチュードが大きくなるほど震度増分が最大となる振動数が低振動数側にシフトした．また，いずれの地震タイプでもマグニチュードの増大につれて震度増分が一定の値に収束する傾向が見られた．
In this study, we investigated the influence of site amplification effect and source spectra on amplification of seismic intensity for the purpose of obtaining basic information for accurately evaluating the amplification of seismic intensity (dI). Firstly, an evaluation formula for dI was obtained based on the relation between earthquake motion spectrum and amplification factor of earthquake motion index. Using the obtained evaluation formula, dI for three earthquake types, various magnitudes, fmax, site amplification effects was estimated. As a result of investigating the relationship between the fundamental peak frequency of site amplification effects and dI, the frequency of maximum dI was shifted to the lower frequency range as magnitude increased for all earthquake types. In all earthquake types, dI tended to converge to a certain value as magnitude increased.
震度増分に及ぼすサイト増幅特性と震源スペクトルの影響に関する基本的考察
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