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Accession Number PB2013-109595
Title Identification of Site Parameters that Improve Predictions of Site Amplification.
Publication Date Jul 2013
Media Count 141p
Personal Author E. M. Rathje S. Navidi
Abstract The effects of the local soil conditions on earthquake shaking are often quantified via an amplification factor, which is defined as the ratio of the ground motion at the soil surface to the ground motion at a rock site at the same location. Site amplification models are empirical equations that predict site amplification based on the general characteristics of the site. Most of the current site amplification models predict amplification based on the average shear wave velocity in the top 30 m (VS30). However, additional site parameters influence site amplification and should be included in site amplification models. To identify site parameters beyond VS30 that influence site amplification and to develop an empirical site amplification model that includes these parameters, site response analyses are performed for a large suite of shear wave velocity profiles. These analyses identified the parameter Vratio, defined as the ratio of the average shear wave velocity from 20 m and 30 m to the average shear wave velocity in the top 10 m, as an important site parameter that influences site amplification. An empirical site amplification model is developed based on the site response results that predicts amplification as a function of Vs30, Vratio, spectral acceleration on rock, and depth to rock.
Keywords Earthquakes
Ground motion
Paducah Plant
Risk assessment
Safety analysis
Seismic effects
Site amplification
Surficial geology

Source Agency National Science Foundation
University of California Earthquake Engineering Research Cent Berkeley
NTIS Subject Category 48F - Geology & Geophysics
89D - Structural Analyses
Corporate Author Texas Univ. at Austin. Dept. of Architectural Engineering.
Document Type Technical report
Title Note N/A
NTIS Issue Number 1323
Contract Number N/A

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