In the case of storey-adding on the roof, the new storey can be treated as the mass of a TMD. And then the TMD, playing a role of earthquake absorption in the horizontal direction, is reasonably formed if provided the tuned stiffness and damping,namely,by means of rubber bearing or friction pendulum bearing. The new storey will reduce the vibration response of the substructure if setting bearings, whereas the response will increase using the conditional methods. Comparisons of damping effects with different methods （such as none storey-adding, traditional storey-adding,storey-adding with rubber bearing and friction pendulum bearing） have then conducted. Additionally,the influence factors of these two bearings are analyzed theoretically.
Key words
storey-adding /
lead rubber bearing /
friction pendulum bearing /
TMD
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