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http://dx.doi.org/10.5000/EESK.2007.11.1.067

Seismic Response Analyses of the Structure-Soil System for the Evaluation of the Limits of the Site Coefficients  

Kim, Yong-Seok (목포대학교 건축공학과)
Publication Information
Journal of the Earthquake Engineering Society of Korea / v.11, no.1, 2007 , pp. 67-77 More about this Journal
Abstract
Site coefficients in IBC and KBC codes have some limits to predict the rational seismic responses of a structure, because they take into account only the effect of the soil amplification without the effects of the structure-soil interaction. In this study, upper and lower limits of the site coefficients are estimated through the pseudo 3-D elastic seismic response analyses of structures built on the linear or nonlinear soil layers taking Into account the effects of the structure-soil interaction. Soil characteristics of site classes of A, B and C were assumed to be linear, and those of site classes of D and E were done to be nonlinear and the Ramberg-Osgood model was used to evaluate shear modulus and damping ratio of a soil layer depending on the shear wave velocity of the soil layer, Seismic analyses were performed with 12 weak or moderate earthquake records scaled the peak acceleration to 0.1g or 0.2g and deconvoluted as earthquake records at the bedrock located at 30m deep under the outcrop. With the study results of the elastic seismic response analyses of structures, new standard response spectrum and upper and lower limits of the site coefficients of $F_{a}\;and\;F_{v}$ at the short period range and the period of 1 second are suggested including the effects of the structure-soil interaction, and new site coefficients for the KBC code are also suggested.
Keywords
site coefficient; structure-soil interaction; nonlinear site; pseudo 3-D; moderate and weak earthquakes; upper and lower limits;
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