Study On The Effective Stiffness Of Basement Roof For The Embedded Of High Rise Building

In the analysis of high-rise buildings,the embedded end of the structure is a very important assumption.The different position of the embedded end not only affects the calculation of the internal force of the structure,but also has a great impact on the project cost.In engineering design,often considered the basement roof as structural fixed ends,however,due to the need of the building function,spacing of basement vertical component becomes larger,the formation of large space building structure,large span,the basement roof at the fixed effect to be clear.In the current study,the research on the influence of the effective stiffness of the basement roof on the structural embedment is relatively scarce,so it often brings the structural design error or improper.Based on the above situation,this paper,through theoretical analysis and numerical analysis,according to the finite element analysis software,to adjust the effective range of the basement of the stiffness,to achieve the basement roof to meet the role of embedded.Therefore,the main research contents and achievements of this paper include:(1)Through literature review,summarizes the current research status of high-rise building block fixed end,summarizes the current structure of a fixed effect research and specification,and points out the research shortcomings and omissions,as designers and researchers refer to provide support for deepening the analysis.(2)The floor stiffness analysis for structure as a whole has a certain influence factors,the paper analyze the influence factors of floor stiffness,and respectively from the thickness of the floor,open hole rate and the second beam layout three aspects to study the influence of floor stiffness.(3)Analyze the influence factors and rules of the effective range of the basement stiffness,and consider the influence of the projection area of the basement,the position of the upper tower and the stiffness of the horizontal connection member.(4)The effective range considering the floor stiffness and basement stiffness,combined with the engineering example,the effect of roof of the basement of the effective stiffness,dynamic characteristics of the high-rise building deformation and internal force characteristics.(5)Through the finite element analysis software Midas-Building,on the basement of the high-rise building in the dynamic elastic analysis,the basement roof effective stiffness effect of solid structure of block,pointed out the basement roof can adjust the basement and the effective range of the lateral stiffness of the fixed effect.