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Evaluation of Site-specific Seismic Response Characteristics at Town Fortress Areas Damaged by Historical Earthquakes  

Sun, Chang-Guk (Earthquake Research Center, Korea Institute of Geoscience and Mineral Resources)
Chung, Choong-Ki (Dept. of Civil, Urban and Geosystem Engineering, Seoul National University)
Kim, Dong-Soo (Dept. of Civil and Environmental Engineering, Korea Advanced Institute of Science and Technology)
Kim, Jae-Kwan (Dept. of Civil, Urban and Geosystem Engineering, Seoul National University)
Publication Information
The Journal of Engineering Geology / v.17, no.1, 2007 , pp. 1-13 More about this Journal
Abstract
In order to evaluate the local site effects at two town fortress areas in Korea where stone parapets were col-lapsed by historical earthquakes, site characteristics were assessed using site investigations such as borehole drillings and seismic tests. Equivalent-linear site response analyses were conducted based on the shear ways velocity ($V_s$) profiles and geotechnical characteristics determined from site investigations. The study sites are categorized as site classes C and B according to the mean $V_s$ to 30 m ranging from 500 to 850 m/s, and their site periods are distributed in the short period range of 0.06 to 0.16 sec, which contains the natural period of fortress wall and stone parapet. From the results of site response analyses in the study areas, for site class C indicating most of site conditions, contrary to site class B, the short-period (0.1-0.5 sec) and mid-period (0.4-2.0 sec) site coefficients, $F_a$ and $F_v$ specified in the Korean seismic design guide, underestimate the ground motion in short-period band and overestimate the ground motion in mid-period band, respectively, due to the high amplification in short period range, which represent the site-specific seismic response characteristics. These site-specific response characteristics indicate the potential of resonance in fortress walls during earthquake and furthermore could strongly affect the collapse of parapets resulted from seismic events in historical records.
Keywords
site effects; site coefficients; site response analysis; shear wave velocity; site period;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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