Relationships between parameters of base isolated high-rise structure with multi-skirt building and large podium

The high-rise structure with multi-skirt building is used widely so as to satisfy the increasing requirement of use functions. Conventionally, in high intensity area, structures adopt isolation technology to promote seismic safety and protect equipments. But, the structure is complex, the horizontal and vertical stiffness are not uniform, so the relationships between parameters of main tower, skirt building and isolated layer will seriously influence the seismic behavior and isolation effect. The influences of different parameters on isolation effect were analysed. The results show that: when the stiffness ratio of isolated layer to main tower is N≤1/14, the ratio of number of floor of skirt building to main tower is 1/3~1/1.5, the stiffness ratio of skirt building to main tower is 0.42~1.1, and the mass ratio of skirt building to main tower is P≥1.1, the main tower can obtain better isolation effect; it is possible to overstate the isolation effect of the upper structure according to the rigid floor assumption, so the large podium must be supposed to be elastic. Above suggestion may provide some references to the design of base isolated high-rise structure with multi-skirt building.