Research On Seismic Performance Of Frame Core Tube Structure With Truss Transition Layer

With the rapid development of science and technology and the continuous improvement of people’s pursuit of living standards,the urban population continues to expand.In order to meet the needs of more people to live in the city,and the continuous improvement of the city appearance,more and more belts are converted.Layers of complex high-rise building structures appear in our lives.At present,the most common form of transfer story in China is the beam transfer structure.The design concepts and seismic performance related to the beam transfer structure have been quite mature.Compared with the beam-type transfer layer,the truss transfer layer has the advantages of clear force transmission path and larger use space.However,in actual engineering,the research on the truss transfer floor is not thorough enough.With the continuous improvement of people’s requirements for construction projects,it is also of great significance for the design of the truss transfer floor structure.This paper takes the actual structure of a frame-core tube with a truss transition layer as the research object,and mainly focuses on the following aspects:(1)Establish finite element models with PKPM software and YJK software respectively,compare the natural vibration period,floor displacement,inter-story displacement angle and floor shear force of the structure,and check the correctness of the structure modeling.(2)Carry out elastic time history analysis and elastoplastic time history analysis of the frame-core tube structure with truss transfer layer,and obtain the time history response curve of the structure’s floor displacement,interstory displacement angle and rare earthquake.The results show that under the action of rare earthquakes,the structure has good ductility and meets the seismic performance goal of "not to fall under a major earthquake".(3)Use PKPM software to model and analyze the three different conversion forms,namely truss conversion,beam conversion and thick plate conversion,and compare and compare the advantages and disadvantages of the seismic performance of structures with different conversion layer forms.(4)Finally,by changing the thickness of the floor-to-ceiling shear wall and the height of the conversion floor respectively,the impact on the seismic performance indicators of the structure(such as natural vibration period,floor displacement and inter-story displacement)is studied,and then the elastic time history analysis of each model Supplemental check calculations,and finally analyze the shear force transmission path of each model.The conclusion shows that as the thickness of the floor-to-ceiling shear wall increases and the height of the transfer floor decreases,the seismic performance of the structure is improved.