The Analysis Of Inter Story Isolation In The Hybrid Layer Structure With Adding Stories

With the frequent earthquake in the world scope and the great loss caused by it, the researches of earthquake have increasingly gone into deep. Particularly, the safety of the building is taken seriously when earthquake happening. At the same time, the idea of Seismic design for the Structures of buildings also changes quietly. Because the traditional seismic structure have limitations and disadvantages in certain circumstances, so slowly derived a new type of" seismic isolation " structure. The "story isolation" is set up isolation bearing between the top of a pillar and floor in a layer, to reach damping. The " seismic isolation " couldn’t solve some problem, such as adding layer to old buildings for transformation, while the "story isolation" can do. As a new technology,the "story isolation" is still in the initial stage. So it is not formed the systemic theory and practice results, especially the research of add layer between hybrid structure is less relatively.This paper first discusses the current development of the "story isolation". Based on this, the research make a model which is4layer of concrete frame with three layers of the light steel structure on the up by the MIDAS/GEN. Then, applying Response spectrum analysis and Time history analysis respectively to analyse this model in earthquake. The model is divided into two:anti-seismic structure with isolation bearing and anti-seismic structure without isolation bearing. By changing the position of the isolation layer, the paper summarize application of regular pattern about the "story isolation" between hybrid structure.The result proves that:after add isolation device, there is obvious effect no matter where isolation layer set layer. The effects include Natural vibration period increased, the acceleration of story shear force and layer displacement decreases obviously., Through changing the position of isolation layer between the hybrid structure, the research find:when make the isolation layer being in the first layer(the junction between new and old structure), the isolation effect is far superior to being in the other layers. In addition, the lower the positior between the hybrid structure, the research find:when make the isolation layer being in the first layer(the junction between new and old structure), the isolation effect is far superior to being in the other layers. In addition, the lower the position of the isolation layer is, the more obvious the damping effect is. And its working mechanism is similar to "base isolation". When the position of the isolation layer is higher, there is certain shock absorption effect, and its working mechanism is similar to TMD.