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02h0085047 20161028100848.0 160727s2014 cc a frb |000|||eng | (paperback) : CNY150.00 NGL eng rda NGL NGL a473 Wong, T. K. C., author. Topographic effects on seismic ground motion / T.K.C. Wong. Hong Kong : Geotechnical Engineering Office, Civil Engineering and Development Dept., 2014. aHong Kong : bGeotechnical Engineering Office, Civil Engineering and Development Department, c2014. 94 pages : illustrations (some color) ; 30 cm. atext btxt 2rdacontent aunmediated bn 2rdamedia avolume bnc 2rdacarrier GEO report ; no. 303 "This report was originally produced in September 2011 as GEO technical note no. TN 4/2011." Includes bibliographic reference. It is well known that surface topography can substantially affect the amplitude of seismic ground motions during earthquakes. Observations from destructive earthquakes, instrumental evidence and numerical studies have shown that seismic ground motion can be amplified over conves topographies such as hills, ridges and crest of slopes. Various numerical studies have been conducted in the past to analyse and predict the effects of topographic irregularities on seismic ground motions, the majority of which consider topographic irregularity as an isolated feature in a homogeneous half-space. Despite the qualitative agreement between theory and observations on topographic effects, these past studies usually obtained amplification factors that are smaller than those from instrumental studies.This technical note presents the results of a parametric study conducted to investigate the effects of different parameters on the topographic effects on seismic ground motions for a soil slope overlying bedrock. This study revealed that the presence of a soil/rock interface would result in another type of site amplification effect, namely soil layer effect. The findings of this study also indicated that as compared to the simple model in which slopes in a homogeneous half-space are considered, the presence of a soil/rock interface would result in larger topographic amplification factors and complicate the topographic effects. Given the complex interaction between topographic effects and soil layer effects, these effects should not be handled separately for the prediction of the overall site amplification factors. The study findings have implications to seismic site response analysis. Hong Kong (China). Geotechnical Engineering Office. GEO report (Geotechnical Engineering Office, Civil Engineering and Development Department ) ; no. 303. aCN b010001 010001 P 251.552 G29 v303 ; h1 ; rCNY150.00 gljx1607
