Analysis of coupling effect of translation and rocking on base-isolated system considering soil-structure interaction

Multi-story frame structure,whose upper story rigidity is smaller,and with a bigger vertical load,when using multi-story packing rubber,the total thickness is bigger and possibly has an obvious vertical displacement which may cause rocking in structure.Based on the cone model,the coupled transfer function under seismic action is derived and the coupling effect on the base-isolated system is analyzed by the use of sub-structure method.The results show that the rocking phenomenon which caused by the vertical deformation of the rubber would have great effect on the based-isolated system in rigid site.