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http://dx.doi.org/10.9720/kseg.2015.2.201

Assessment of Surface Topographic Effect in Earthquake Ground Motion on the Upper Slope via Two-Dimensional Geotechnical Finite Element Modeling  

Sun, Chang-Guk (Earthquake Research Center, Korea Institute of Geoscience and Mineral Resources)
Bang, Kiho (Geotechnical and Tunnel Division, Dohwa Engineering Co., Ltd.)
Cho, Wanjei (Department of Civil and Environmental Engineering, Dankook University)
Publication Information
The Journal of Engineering Geology / v.25, no.2, 2015 , pp. 201-213 More about this Journal
Abstract
Site effects resulting in the amplification of earthquake ground motion are strongly influenced not only by the subsurface soil conditions and structure, but also by the surface topography. Yet, over the last several decades, most studies of site-specific seismic responses in Korea have focused primarily on the seismic amplification associated with geologic and soil conditions. For example, the effects of local geology are now well established and have been incorporated into current Korean seismic design codes, whereas topographic effects have not been considered. To help address this shortcoming, two-dimensional (2D) seismic site response analyses, using finite element (FE) ground modeling with three different slope angles, were performed in order to assess the site effects of surface topography. We then compared our results, specifically peak ground acceleration (PGA) and acceleration response spectrum, to those of one-dimensional (1D) FE model analyses conducted alongside our study. Throughout much of the upper slope region, PGAs and spectral accelerations are larger in the 2D analyses than in the 1D analyses as a result of the topographic effect.
Keywords
topographic effect; site amplification; finite element analysis; earthquake ground motion; seismic site response;
Citations & Related Records
Times Cited By KSCI : 4  (Citation Analysis)
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