Pushover Analysis Of Prefabricated Steel Frame Structure With Inclined Support Joints

Prefabricated steel structure factory production method simplifies the scene construction procedures, short construction period and low pollution. Promote this structure system meet the policy of green environment protection in our country. As a new type of prefabricated steel structure, prefabricated steel frame structure with inclined support not only successful implementation the progress from multi-layer steel framework structure to the field of high buildings, but also give full play to the advantages of prefabricated steel structure with its style of modular factory production, at the same time, construction period is greatly reduced. In order to promote this new type of structure system better, it is necessary to study its seismic performance.Fabricated in this thesis, a 30 layer prefabricated steel frame structure with inclined support joints as the research object, using the Pushover analysis method to elastic-plastic analysis, analyzed the seismic performance of structure, discusses the inclined support for structure deformation. The specific content is as follows:(1) Introduced the research status of prefabricated steel frame with inclined support joints system, this thesis introduces the development process of seismic design theory and performance-based seismic design theory. Briefly describes the history and present research situation of Pushover analysis. Described some engineering cases of Pushover analysis in our country.(2) Pushover analysis is introduced in the equivalent single degree of freedom system? the level of basic assumptions and lateral force loading pattern, briefly introduce the principle of capacity spectrum method and steps, analyzes the advantages of Pushover method.(3) Modal analysis, vibration mode decomposition response spectrum analysis and Pushover analysis was carried out on a 30 layer fabricated steel frame with inclined support joints, study the structural deformation under severe earthquake, analysis the development of plastic hinges, the results show that, under rare earthquake of 7 degrees, the maximum story drift of the structure is 1/223, which less than specification limits, the structure meet the seismic fortification goal. Hinges of the structure mostly occur in webs of the truss beam and frame column keep in elastic stage, which meeting the seismic design requirements of weak beam. Indicating that the structure has good seismic performance.(4) In order to study the influence of the inclined support on seismic performance of structure, selection model without inclined support, and compares the results with model with inclined support, it is concluded that the arrangement of inclined support reduces the deformation of the structure under severe earthquake, the top displacement of structure decreases 33.4%~38.1%, the maximum story drift ratios of structure decreases 19.3%~40.1%.