Smoothed response spectra including soil-structure interaction effects

Elastic response spectra that take into account the effects of soil-structure interaction on soft soils are developed. The response spectra are calculated utilizing a 3DOF system including deformations of the superstructure and foundation. The equations of motion of the system are solved using direct integration under normalized earthquake records. Statistical processing of the results is implemented resulting in response spectra for “short and dense buildings with low interaction”, “short and dense buildings with high interaction”, “tall and light buildings with low interaction” and “tall and light buildings with high interaction”. The resulting response spectra are smoothed and discussed.