Earthquake-Induced SSI Effects on High Rise Buildings


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Title: Earthquake-Induced SSI Effects on High Rise Buildings

Author(s): Nien-Yin Chang and Hien Manh Nghiem

Publication: Special Publication

Volume: 316


Appears on pages(s): 1-22

Keywords: Soil-structure-interaction, pile, models, modal earthquake, stiffness, high-rise building, seismic

Date: 4/1/2017

Because of the complexity of the soil-structure interaction (SSI) effect on high-rise buildings, contemporary design codes allow the use of results from an advanced numerical analysis in the design of structures without providing further stipulation. The information on SSI effects, however, is only available for low rise buildings with simple analysis procedures. Two hypothetical 20-story buildings and one 30-story real building were subjected to seismic response analyses using SSI3D under the following conditions: rigid base, flexible base with linear foundation springs, flexible base with linear soil, flexible base with nonlinear springs, and the full SSI analysis with flexible base with nonlinear soils for two hypothetical buildings. For the real building, the calculated natural periods, base shears, and top-floor displacements were compared to the values evaluated using the recorded building motions. It was observed that the natural periods increase and the base shears decrease as the base becomes more flexible, but further study is needed to examine the top-floor side sway.