Analysis of Impact of Arrangement of Isolation Bearing on Seismic Behavior of Isolated Multi-Tower Structures with Large Base on Subway
The stiffness distribution of the isolation story and the isolation effect are badly influenced by arrangement of isolation bearings.Based on the stiffness ratio and eccentricity ratio of the lead rubber bearing,the arrangement of the isolation bearing was determined.The effect of different arrangement of the isolation bearing on the seismic response of the isolated multi-tower structures with large base on the subway was studied.The variation law of seismic decrease coefficient,floor acceleration,inter-story drift,floor displacement and floor shear of isolated structure was studied.The results showed that when stiffness ratio of the lead rubber bearing varied within a certain range,the seismic decrease coefficient of isolation story and superstructure increased,the floor acceleration,floor displacement,inter-story drift and floor shear of isolation story and superstructure decreased.For the substructure,the seismic decrease coefficient and floor shear increased,while the floor acceleration and inter-story drift decreased,and the floor displacement was almost constant.When eccentricity changed within a certain range,the seismic decrease coefficient and floor acceleration of isolation story and superstructure increased,while the floor displacement,inter-story drift and floor shear of isolation story and superstructure decreased.For the substructure,the damping coefficient increased,the inter-story drift and floor shear decreased.Floor acceleration and floor displacement were almost constant.
development and utilization above subwaymulti-tower structuresseismic isolation structuresstiffness ratio of lead rubber bearingeccentricity ratio
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