The Research On Vertical Deformation And Deformation Difference Of Tianjin Chow Tai Fook Financial Center During The Construction Process

Steel frame-reinforced concrete corewall structure has been widely used because of its advantages in steel structure and concrete structure,at the same time,the structure also has a huge economic advantage.But with the increasing height of the building,the vertical deformation difference between the vertical members of the structure is getting bigger and bigger,which has a great influence on the safety performance of the structure.Therefore,it has a great engineering application value to study the vertical deformation of steel frame-reinforced concrete corewall structure.Based on the measurement and simulation analysis of the structure of Tianjin Chow Tai Fook Financial Center,study the development law of vertical deformation and vertical deformation difference between the vertical members during the construction of the super high-rise steel frame-reinforced concrete corewall structure,the results are as follows:1.In this paper,the mechanism and influencing factors of the mechanical parameters of the early age concrete are expounded,and the calculation formula of the mechanical parameters of the early age concrete with time is introduced.This paper studies the development law of the vertical deformation of the frame tube in the construction process of Tianjin Chow Tai Fook financial center tower construction.The results show that the vertical deformation and deformation difference of the structure are “the middle large,the top and the bottom are small”.The results of vertical deformation of the core tube are verified by the results of the 1~65 floorelevation test.At the same time,the calculation of the foundation settlement is carried out.Finally,the axial force of the frame is calculated by the vertical deformation.2.Using finite element program software MIDAS/GEN analysis the influence of shrinkage and creep of the floor concrete and the corewalls,and simulation analysis of the actual working conditions of the structure is carried out.Compare the simulation results and the measured results,the simulation results of the vertical deformation difference between the vertical members of the structure are consistent with the development of the measured results,showing the “middle layer of large,top,bottom small” changes in the law.3.Based on the finite element model,the influence of the number of advance layers and the construction speed on the vertical deformation of the structure is analyzed.The results shows: the more the number of layers of the corewalls ahead of construction,the smaller the deformation of the frame tube;the faster the construction speed,the greater the difference in the deformation of the frame tube.4.This paper derive the formula of the vertical deformation difference between the vertical members of the structure,and calculated the Tianjin Chow Tai Fook Financial Center structure cap time,capping a year later and the three years after the closure of the three vertical structure of the compensation value to make the vertical structure of the tower structure in these three moments to achieve the design state.On this basis,the method of predicting the vertical deformation and deformation difference of steel frame-reinforced concrete core tube structure is fitted.Based on the measurement and simulation analysis of Tianjin Chow Tai Fook Tower,the development law of vertical deformation and vertical deformation difference during the construction of super high-rise steel frame-reinforced concrete core tube is studied,and the calculation of vertical deformation compensation value of vertical structure is deduced.And the vertical deformation and deformation difference prediction formula are fitted.The vertical deformation and deformation difference of the frame tube produced in the construction stage of the high-rise steel frame-concrete core tube are calculated and the compensation scheme is provided for reference.