Analysis Of The Key Joints Of Transfer Floor In National Financial Information Center Building

With the development of science and the progress of society and economy, all the countries in the world are building a large number of high-rise buildings. High-rise building can shorten the development cycle of public facilities and municipal pipe network, so that to reduce the municipal investment and accelerate the construction of city. The most important is the high-rise building can save city land. Nowadays, the development of high-rise building is toward comprehensive direction with functional diversity and complex shape. With the rapid development of high-rise buildings and structures, there will be more new and reasonable architecture appears.The structural system of the Beijing Financial Information Building is a mega frame-core. The 59th and 60th floors of the building is designed as a transfer floor of structural change from square to circle shape. So the 59th and 60th floor are conversion layer, the conversion layer is also the device layer and asylum layer. In this thesis, a refined mechanical model about the transfer floor structure is established separately from the whole structure of the building. Then the strength and stability of the transfer floor structure subjected to the seismic actions are analyzed by finite element method. Consequently, the properties of transfer truss, core tube, the concrete-filled steel tube, steel beams and other members in the transfer floor are evaluated after strongly earthquake action.Based on the results of the finite element analysis (FEA) for the conversion layer structure, three typical key joints are separated from the conversion layer structure with the corresponding boundary condition under the dangerous load conditions. Then the stress statuses of the key joint structures were respectively obtained by FEA. The joints design subjects were proposed and evaluated based on results of the re-analysis up to meet the requirements of the structural strength. The truss that connected with the key joint is axes-pressure component. The calculation results show that it meets requirements of structural stability.