Research On The Structure Of Single-Tower With Enlarged Base Story Isolation

The structure of single-tower with enlarged base is vertical irregular structure. It has been widely used in China. But earthquake-resistance performance of the structural is very poor.The stiffness change of this structure is very easily desroryed,even be collapsed under earquake.How to ensure its safty is the key of the seismic design.Isolation technology is one of the most representative seismic technology in 20th century. The isolated building showed a good damping effect at home and abroad. Story isolation put the small horizontal stiffness of isolation layer on the basis of a certain level of capitals. Rely on the larger deformation of the isolation layer and the consumption capacity to prevent the seismic waves uping to the superstructure,and reduce the earthquake acting on the superstructure .To ensure that buildings safety and functions under earthquake.This article first introduces the characteristics and form of the single-tower. Analyze the shortage of the traditional design method and the feasibility and advantages of the structure when use story isolation technology. Introduces the principles,characteristics and scopes of the base isolation and story isolation. Using finite element analysis software SAP2000 to establish a nine-storey frame structure with non-isolated and set the story isolation of the analysis model. Through the results of the two models of the earthquake response, Study the effcct of the story isolation. The results show that: The acceleration amplitude of the story isolation structure is less to the seismic structure; the isolation layer occurs large displacement deformation,the superstructure basically as a whole translation; At the same time the shear of the story isolation is less than the seismic structure; So to ensure the safety of the structure.