Influence of Shallow Foundation Characteristics on the Seismic Response of Mid-Rise Buildings Subjected to Strong Earthquakes

Publication Type:
Conference Proceeding
Geotechnical Special Publication, 2016, 2016-January (259 GSP), pp. 117 - 124
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© ASCE. Performance based seismic design is a modern approach to earthquake-resistant design shifting emphasis from "strength" to "performance". In this study, the influence of the shallow foundation (footing) size on the seismic performance of the buildings subjected to strong earthquakes is investigated considering soil-structure interaction (SSI). A fifteen storey moment resisting frame sitting on shallow foundation over soft soil with different foundation size is simulated numerically using ABAQUS software. The developed three dimensional numerical simulation accounts for nonlinear behaviour of the soil medium by considering the variation of soil stiffness and damping as a function of developed shear strain in the soil elements during earthquake. Elastic-perfectly plastic model is adopted to simulate foundations and structural elements. Four strong earthquake records, including El Centro 1940, Hachinohe 1968, Northridge 1994, and Kobe 1995 have been taken as input accelerations for time history analysis in time domain. Due to natural period lengthening, there was a significant reduction in the base shears when the size of the foundation was reduced. It can be concluded that the foundation size can influence the dynamic characteristics and seismic response of the building due to SSI and should therefore be given careful consideration in order to ensure a safe and cost effective seismic design.
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