| In recent years,earthquake disasters, especially destructive earthquake has a tendency to increase at home and abroad.Earthquake disasters constitute great threats to people’s life safety, also brought huge economic losses to the society.Due to the unpredictability of earthquake, ensure the safety of the buildings has become the important measures for preventing earthquake disasters, this makes the seismic design of buildings particularly important.With the development and progress of society, various forms of buildings and structures emerge in endlessly, people not only pay attention to the practicality and safety of buildings, but also pay more and more attention to the shape of the building, all kinds of distinctive architectural modeling arises at this moment.Large cantilever structure in the modern architectural design of the application become more and more widely, but large cantilever structure on the seismic performance is relatively bad. So the seismic performance of large cantilever structure is studied with theoretical significance and application value.Based on a practical project as an example, this paper adopts the static elastoplastic analysis method, modeling and analysis by SAP2000 to research the large cantilever steel frame structure seismic performance under seismic action.Analyses the seismic performance of the structure through the top displacement,the interlayer displacement angle of the structure and the development of plastic hinges in frequently and seldomly occurred earthquakes.Compare the impact of the earthquake on the direction of seismic behavior, obtain and influence the direction of seismic action direction cantilever structure seismic performance.Through the structural dynamic time history analysis, calculate the dynamic response of structure under different seismic waves to situation.By entering different seismic waves,compare the differences of the displacement-time curve between them,comparing and analysing the results with the results of static analysis methods.Then study the influence of different span cantilever on seismic performance of structure rules and put forward the corresponding optimization measures, for the future design and provide a reference for earthquake resistance analysis of similar structures. |
