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Nonlinear Seismic Analysis of Steel Buildings Considering the Stiffnesses of the Foundation-Soil System  

Oh, Yeong Hui (목포대학교 건축공학과)
Kim, Yong Seok (목포대학교 건축공학과)
Publication Information
Journal of Korean Society of Steel Construction / v.18, no.2, 2006 , pp. 173-180 More about this Journal
Abstract
The seismic responses of a building are affected by the base soil conditions. In this study, linear time-history seismic analysis and nonlinear pushover static seismic analysis were performed to estimate the base shear forces of 3-, 5-, and 7-story steel buildings, considering the rigid and soft soil conditions. Foundation soil stiffness, based on the equivalent static stiffness formula, is used for the damper, one of the Link elements in SAP 2000. The base shear forces of the steel buildings, estimated through time-history analysis using the general-purpose structural-analysis program of SAP 2000, were compared with those calculated using the domestic seismic design code, the UBC-97 design response spectrum. and pushover static nonlinear analysis. The steel buildings designed for gravity and wind loads showed elastic responses with a moderate earthquake of 0.11 g, while the elastic soft-soil layer increased the displacement and the base shear force of the buildings due to soil-structure interaction and soil amplification. Therefore, considering the characteristics of the soft-soil layer, it is more reasonable to perform an elastic seismic analysis of a building's structure during weak or moderate earthquakes.
Keywords
nonlinear pushover static seismic analysis; foundation soil sti steel building;
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