Study On The Seismic Respanse Of Story Isolation Buildings Under Near-fault Pulse-like Ground Motions

Isolated structure shows excellent Performance in effectively reducing the damage resulted from the common ground motion; however behaves poorly under near-fault ground motion. At present, most of research related to the base-isolated structrues is based upon the common ground motion, there is also some investigation into the effect of near-fault ground motion; The story isolation structure is a new type of isolation system, the research is limited to common ground motion; however there is no study on the seismic respanse of story isolation buildings under near-fault pulse-like ground motions. With the develop of story isolation structure, it is necessary to study the the seismic respanse of story isolation buildings and the possible adverse effects under near-fault pulse-like ground motions, it also enriched and improved Isolation Theory. In this paper, isolated structure with lead rubber bearings (LRB) is selected as research object, and the study includes the following aspects:(1) Establishing the dynamic model of story isolation structure and dynamic analysis method.(2) Built the finite element model of a seven-story frame structure using finite element analysis software SAP2000. Analyze the response of isolated single / double-isolated structures in different layers and combinations under common ground motion , and there is some comparative study on base-isolated and seismic structure.(3) opted a more concise equivalent velocity pulse model for the parameters study of civil engineering structure after comparative study on existing equivalent velocity pulse models. and gives a more reasonable synthetic near-fault pulse-type ground motion method on this basis.(4) Synthesized self near-fault pulse-type seismic waves by using the Matlab software program according to the proposed method, comparative study is carried out with single-layer and multi-layers story isolation structure.