| For the past few years,with the fast development of The Times,the traditional high-rise buildings have been unable to satisfy the needs of use,a number of super high-rise buildings have been built.In terms of architectural function,a lot of super-high-rise buildings are used for office needs,and the plane layout is relatively regular.However,in terms of facades,due to the requirements of building codes,in order to avoid vertical irregularity caused by lateral stiffness mutation of structures,most stories have little difference.However,in practical engineering,due to the functional needs of the building,there may be floors of smaller height,which leads to the lateral stiffness of the structure can not meet the requirements of the code,so in this kind of problem,how to deal with the vertical irregularity caused by the functional needs of the structure is the focus of structural design.At present,the problem of irregular lateral stiffness ratio caused by lower story height is mainly solved in super-high-rise structure with lower story equipment.At present,there are usually three treatment methods for the layer height of structural equipment layer: 1.The equipment layer is taken as a separate structural layer;2.Merge the equipment layer and its adjacent upper layer into a structural layer;3.Merge the device layer and its adjacent next layer into the structure layer.For the above three low-level equipment layer height treatment methods should be considered comprehensively according to the results of structural analysis and function application.In this paper,the frame-core tube structure of a ultra high-rise building with an equipment floor in Hefei is taken as an example and analyzed from the following aspects according to the seismic performance requirements of the structure:1.Assume different height schemes for the equipment floor,and SATWE program was used to analyze the mode-superposition response spectrum method of frequent earthquakes under different schemes,and the results are compared and selected.The results show that the lateral stiffness ratio of some floors changed suddenly when the single structure layer is selected,considering the cantilever bending of the core tube as a whole,the shear wall has no inflection point,so the lateral stiffness calculated by the model has little relation with the storey height of the core tube shear wall,so further analysis is taken.2.The equipment layer is taken as a separate structural layer,and mode-superposition response spectrum method is supplemented for the overall structure on the basis of the above modal decomposition response spectrum analysis.The analysis shows that both the floor displacement and the inter-floor displacement angle of the structure can meet the requirements of the code.3.Midas Building software is used to select a reasonable calculation model for the overall structure and conduct dynamic elastic-plastic analysis under rarely occurred earthquakes.The analysis results show that all the indexes of the structure meet the requirements of the code,and the yield mechanism of the components meets the requirements of "strong column and weak beam","strong wall limb and weak beam",and "strong shear and weak bend",so as to achieve the fortification target of "no collapse under strong earthquake".4.According to the analysis results of Midas Building,the shear wall limbs with relatively serious damage on the equipment layer of the structure are selected for finite element analysis by using Abaqus CAE 2020 software,select the appropriate element type and damage model.The results show that only a few elements in the corner of the wall are moderately damaged,and the rest remain elastic,which is consistent with the results of elastic-plastic analysis.The above analysis can be combined that the equipment layer can be selected as a separate structural layer in this project,and corresponding strengthening measures can be taken to meet the safety of the project.Figure [57] Table [23] Reference [74]... |
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