A study on the evaluation method of site amplification factors

2016 Fiscal Year Final Research Report

• Project/Area Number: 26420458
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Structural engineering/Earthquake engineering/Maintenance management engineering
• Research Institution: Kobe University
• Principal Investigator: NAGAO Takashi 神戸大学, 都市安全研究センター, 教授 (30356042)
• Research Collaborator: YAMADA Masayuki 株式会社ニュージェック
• Project Period (FY): 2014-04-01 – 2017-03-31
• Keywords: 設計地震動 / サイト増幅特性 / 強震動シミュレーション / 差分法 / クリギング法 / 地震応答解析

Outline of Final Research Achievements

It is difficult to evaluate site amplification factor analytically because site amplification factor is affected by several factors such as three dimensional deep subsurface profile. Therefore, site amplification factors have been evaluated by spectral inversion using strong motion records and those at sites without strong motion observation records have not been evaluated precisely.
In this study, evaluation methods of site amplification factors were established. One method employs three dimensional finite difference analysis results and empirical site amplification factors. Another method estimates site amplification factors by modifying the amplification factors assuming horizontally layered deep subsurface profile at the site of interest by using the kriging method and regression equations in terms of peak frequencies of the amplification factors.

Free Research Field

地震工学