M. M. Saativahid - Department of Civil Engineering, Isfahan University of Technology, Isfahan, Iran
m Ziaee - Department of Civil Engineering, Isfahan University of Technology, Isfahan, Iran
M. M. Saadatpour - Department of Civil Engineering, Isfahan University of Technology, Isfahan, Iran

the satisfactory performance of friction - pendulum system during earth quake leads to growing demand for both research and construction to involve soil structure interaction in the analysis of friction pendulum base isolated structure stiffness and damping of soil medium should be transformed from frequency domain parameters in to time domain parameters on account of severe nonlinearity of friction -pendulum system during earhquake.

dynamic analysis , base isolated structures , soil structure interaction , friction pendulum system Fps, lumped -parameter method