Design method of stiffness of isolation bearing of mountainous drop-frame structure

Abstract

The present application relates to the field of structural seismic isolation, and discloses a design method of the stiffness of a mountain drop-floor frame structure seismic isolation support, determines a shock absorption target; designs the upper structure by reducing one degree; analyzes the non-isolation model response spectrum under the fortification earthquake action, and determines the non-isolation structure base shear force; sets the base shear force ratio to 0.5; selects the upper ground isolation support; determines the lower ground isolation support according to the equivalent uniform stiffness method, that is, according to the same shear force that each non-uniform ground column should bear when the structure is subjected to horizontal lateral force, the equivalent stiffness of the series connection of the non-uniform ground column isolation support and the ground column after the arrangement of the isolation support is the same; establishes the overall isolation model, analyzes the fortification earthquake response spectrum, and judges whether the shock absorption target is met; performs the upper structure design reinforcement and the isolation structure wave selection, and performs the rare earthquake isolation layer checking. Compared with the traditional isolation structure, the base shear force of the drop-floor isolation structure based on the equivalent uniform stiffness concept is smaller, and the torsional response is obviously improved.

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