Structure Behaviour Due To Soil-Structure Interaction On Buildings With Basement

Abstract Although regarding SSI has regulated in SNI 1726-2019 chapter 14 concerning “soil-structure interaction for seismic design” but until now this practice still in Indonesia relatively few and some case planning structure even no consider SSI effect. This study evaluate effect interaction between soil and structure (Soil-Structure Interaction, SSI) in multi-story building with basement use method analysis dynamic time history. The effects of SSI are reviewed from behavior structure to dynamic load that includes natural period structure, base shear, displacement structure and displacement between floor (story drift) is analyzed with compare models foundation rigid and foundation flexible. Research result show that the SSI model can extend natural period structure on the stiff soil and capable reduce base shear up to 28.01%. Models with two basement floor showing more reduction big compared to model with one basement floor, showing that stiffness addition from the basement more effective in reduce inertia force. Additionally, SSI lowers mark displacement and story drift are 12.87 mm and 1.16 mm respectively, this phenomenon give impact positive to integrity and performance structure This study emphasize importance consider SSI in design structure for produce more response accurate and optimal for earthquake load.