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http://dx.doi.org/10.14481/jkges.2011.12.6.6

Evaluation for Fundamental Periods of Domestic Rockfill Dams with Micro-earthquake Records  

Ha, Iksoo (한국수자원공사 수자원연구원 기반시설연구소)
Publication Information
Journal of the Korean GEO-environmental Society / v.12, no.6, 2011 , pp. 53-60 More about this Journal
Abstract
The purpose of this study is to propose a method that can reliably evaluate the fundamental period of a rockfill dam using the micro-earthquake records, which were obtained at the domestic dam sites. For total 20 micro-earthquake records obtained at 7 domestic rockfill dam sites against 6 earthquake events which recently occurred, the fundamental periods of seven rockfill dams were evaluated by two kinds of methods; one is a method using acceleration amplification ratio and the other is a method using acceleration response spectrum ratio. Applicability of each method to evaluation of fundamental periods of domestic rockfill dams was examined. In the moderate seismicity region like our country, the method using acceleration response spectrum ratio, which could evaluate the fundamental period of the rockfill dam using the ratio between the response spectrum for acceleration observed at the dam crest and that observed at the dam base or abutment, proved to be reliable and was proposed in this study. From the results of analyses, it was found that the proposed method could consistently evaluate the fundamental period of the rockfill dam and the results obtained by the proposed method were very similar to the results by the existing method which was proposed from the analysis for the earthquake records observed at Japanese dam sites.
Keywords
Fundamental Period; Rockfill Dam; Micro-earthquake Record; Response Spectrum;
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