Study on design of tensile performance of the Chengdu Museum base isolation structure

Abstract

Irregular structures with base isolation will produce a greater local tension in the isolation layer under seismic action. Rubber isolation bearings are susceptible to tensile failure and thus affect the structure safety. The tensile limit device can effectively solve the tension problem of isolation layer, but there is no relevant specification for the design methods and performance indicators. Combined with irregular base isolation engineering of the Chengdu Museum which had been completed, vertical tensile and shear tests of rubber isolation support were conducted. The tensile performance specifications of tensile limit device were put forward. And the corresponding new tensile limit device has been invented. Through the time history analysis on overall structure model under different intensity earthquake effects, the design methods and design specifications of irregular structure of base isolation structure were proposed. The tensile limit device are not triggered to work or remained elastic under the load corresponding to the 8 degree rare earthquake. Under 9 degree rare earthquake, the tensile limit device dose not yield and some of the rubber isolation bearings become plastic, but still maintain the capability of being further stretched.