The equivalent beam model was established for the base-isolated high-rising building structure with relatively uniform mass and stiffness distribution along the height. Based on the method of vibration mode decomposition response spectrum, the key indexes of vibration mode number, vibration mode participation quality, seismic shear force and moment of the isolated and non-isolated structures were discussed and analyzed. The critical stiffness ratio and critical period ratio of the horizontal seismic reduction coefficient are given, and the general control law of the two critical ratios to the seismic reduction coefficient is further analyzed. The study concluded that: 1) When the basic period ratio >1.3 or equivalent stiffness ratio >0.8, the high-order vibration mode response of the isolation structure can be effectively suppressed, and the influence of the basic mode on the seismic response of the structure can only be considered. 2) The base shear ratio and moment ratio of the structure after and before being isolated are related to the ratio of the overall equivalent stiffness of the superstructure to the horizontal equivalent stiffness of the isolation layer as well with the basic period ratio, and have nothing to do with the parameters such as mass and damping. 3) When < or < , the base moment reduction effect is worse than the shear force, so the bottom moment ratio should be the control index; otherwise, the base shear force ratio should be the control index when > or > . The values of and can be determined in accordance with the data given in this paper. The related research results can provide reference and basis for related further theoretical research and engineering application.
Key words
High-rising building structure /
Base isolation /
Equivalent beam model /
Critical stiffness ratio /
Seismic reduction coefficient;
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