| With the development of society and economy,the number of high-rise buildings is increasing.But with the increase of height and the extension of construction period,vertical deformation difference between frame column and core tube is more and more distantly,and its impact on the normal service of buildings has gradually attracted the attention of civil field.Since 60 s of 20 th century,scholars both at home and abroad have successively carried out researches on vertical deformation difference of high-rise building by observing vertical deformation on spot,infering vertical deformation difference formula and finite element simulation analysis.At present,research of vertical deformation difference in civil engineering mainly focus on whether considering the influence factors of construction process and creep and shrinkage,which has an important significance on building structural design and construction method.This paper used finite element software MIDAS GEN to analyse a complex tall building modeling,and aimed at different loading ways and concrete shrinkage and creep to study the influence of the vertical deformation difference.The main research work and research results are as follows:(1)Simulating and analysing vertical deformation of frame column and core tube in "one-time loading" and simulating construction loading conditions,and analying the influence of different loading ways on vertical deformation difference.The result showed distribution law of vertical deformation in height direction was different under these two loading ways.Under the "one-time loading" condition,vertical member deformation was gradually increased from bottom to top,and the maximum value was at the top floor,while under the simulating construction loading condition,the value of vertical member deformation was increased from the bottom and then diminished,and the maximum value was in the middle floor;under the "one-time loading" condition,the vertical deformation between frame columns and shear walls had obvious difference,while under the simulating construction loading condition,the vertical deformation was relatively small;the development tendency of vertical deformation difference of frame column and core tube under different loading ways was similar to vertical deformation,that was under the "one-time loading" condition,it gradually increased from bottom to top,while under the simulating construction loading condition,it increased from thebottom and then diminished,forming the shape of fish maw.(2)Simulating and analysing the vertical deformation of frame column and core tube on the condition of whether considering about concrete shrinkage and creep,and making statistic analysis on data of vertical deformation difference.The result showed that concrete shrinkage and creep effect on vertical total deformation of frame column in super high-rise building was about 38.7%,while the effect on core tube was about43%,but due to the deformation of frame column was greater than core tube,so under the same conditon the vertical deformation variation value of frame column was greater than core tube;for the deformation difference between frame column and core tube,duing to the deformation increment was greater than core tube when considering shrinkage and creep,concrete shrinkage and creep effect would increase the vertical deformation difference of construction.(3)Simulating and analysing the vertical deformation of steel column and concrete column,and making statistical analysis on the vertical deformation difference data.The result showed that the vertical deformation difference between steel frame column and core tube was only about 60% of concrete frame column and core tube.Duing to steel had almost no time dependent properties,steel frame column almost does not occurred shrinkage and creep in usage process,and the vertical deformation of steel frame column was less than concrete frame column,but the core tube deformation was similar in the two cases,so the vertical deformation difference of steel frame column was smaller than concrete frame column. |
