Mechanical Analysis Of Whole Structure And Transfer Floor Of National Financial Information Building

With the development of technology, super high-rise buildings have been widely applied in China. Building structures have become increasingly sophisticated in order to meet people’s various needs, in which the choice of transfer floor and seismic design has become the focus of the scholars.National Financial Information building is a mega frame-core-tube structures with the architectural height of 360m. There is a truss transfer from square to circle in the 60th floor of the structure. And the transfer floor under seismic load needs to meet the expected performance. The research of the anti-seismic performance of National Financial Information building and its transfer floor was done in this thesis. The main work has been done as follow:1) The elastic response spectrum analysis of National Financial Information building structure has been completed by two different finite element method (FEM) software ETABS and MIDAS. Comparison on the main anti-seismic index of super high-rise building under seismic load has been done to obtained natural period, period ratio, bottom shear force, overturning moment, story drift and the maximum displacement. The computed results of MIDAS show that the first natural period of the building is 6.33s, and the first period ratio is less than 0.85. Other indicators of the overall structure are basically consistent.2) The effects of two different arrangement forms of the transfer truss to the whole structure are analyzed by FEM. Meanwhile, comparison and analysis of the transfer truss, frame column, corner column and other components has been done. The computed results show that two arrangement forms of the transfer floor has little effect for the structural period, but the stress and deformation of the truss, column in the transfer floor has a significant difference. The second arrangement form of transfer floor has better mechanical performance in load transfer and the distribution of giant column frame and shear wall.3) Based on the above study, the mechanical model of the transfer floor was established. Then, finite element analysis of the building was implemented to obtained the stress fields of the transfer truss, core tube, the concrete-filled steel tube, steel beams and other members in the earthquake load. As a result, the strength of the structure of the transfer floor was also evaluated subjected to the earthquake load. Finally the working order of the transfer floor under seismic load is determined. According to the above analysis results, the design of upper chord joints of the transfer truss could be achieved to be sufficient to use actual requirement.