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http://dx.doi.org/10.5000/EESK.2005.9.4.029

Evaluation of Site-Specific Seismic Amplification Characteristics in Plains of Seoul Metropolitan Area  

Sun, Chang-Guk (한국도로공사 도로교통기술원)
Yang, Dae-Sung (대한컨설턴트 지반공학부)
Chung, Choong-Ki (서울대학교 지구환경시스템공학부)
Publication Information
Journal of the Earthquake Engineering Society of Korea / v.9, no.4, 2005 , pp. 29-42 More about this Journal
Abstract
Total 350 borehole profiles were selected from the database of borehole logs in Seoul, for the site-specific seismic evaluation at two 4km${\times}$4km plain areas. Equivalent-linear site response analyses for the selected 350 sites were conducted based on shear wave velocity (Vs) Profiles, which were determined from the N-Vs correlation established using borehole seismic testing results in the inland areas of Korea. Most sites were categorized as site classes C and D based on the mean Vs to 30 m in depth (Vs30) ranging from 250 to 550 m/s. The she periods of the plains in Seoul ranging between 0.1 and 0.4 sec were significantly lower than those of the western US, from which the site coefficients in Korea were derived. For plains in Seoul, the site coefficients, Fa's and Fv's specified in the Korean seismic design guide, underestimate the ground motion in short-period (0.1-0.5 sec) band and overestimate the ground motion in mid-period (0.4-2.0 sec) band, respectively, because ol the differences in the geotechnical conditions between Seoul and the western US, although the Fa's in several sites overestimate the motion due to the base Isolation effect resulted from the soft layer in soil deposit.
Keywords
site coefficients; site response analysis; response spectrum; shear wove velocity; site period; One isolation effect;
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