The composite foundations are getting more and more application to construction engineering. However

the research on their seismic behavior under dynamic loading

especially under seismic loading

is quite limited. Now

the seismic response analysis in the time domain is performed with ADINA program

considering the interactions among foundation

footing and superstructure. The influence of earth surface peak acceleration

displacement and pile moment

shearing force under different pile body moduli

the influence of peak moment and accumulated plastic curvature of superstructure under different bedding cushion characters (different moduli

different depths)

are analyzed. Based on these analyses

some conclusions which may be useful for seismic design of this type composite foundation are drawn.