Design method and its application in hybrid base-isolation of high-rise buildings

In order to perfect both theoretical basis and designing foundation for hybrid base-isolation of tall buildings, some key issues about upper structure design for hybrid base-isolation system and isolation layer design, influence from high modes and high damping on isolated effect are investigated. Basic principles of vertical components arrangement for seismic isolation system are proposed, and basic principles of isolation layer design and distribution method of all kinds of isolation devices are analyzed. According to above fundamental theory, performance-based hybrid base-isolation design method is applied to the currently tallest domestic high-rise isolated building. The performance characteristics of purified natural rubber bearing, lead rubber bearing, sliding isolated bearing and viscous damper are fully taken into account. These bearings are equipped in isolation layer, according to the correlative combination principle. The study result indicates that all kinds of isolation devices bring the designed functions into full play. Isolation layer keeps a stable working status under rare earthquake, while seismic response of upper structure declines obviously, and all performance objectives satisfy design requirements. At last, necessary remarks are made for related structural requirements of high-rise isolated structures.