Effect Of Wind Load On Design And Construction Of 530m Super-tall Tower Of Tianjin CTF Financial Center

In recent years,super high-rise building is rising rapidly in China,and the city skyline has been refreshed.With the development of science and technology,the super high-rise buildings gradually show the characteristics of light quality,high flexibility and low damping,which makes the structure improve the sensitivity of the wind.Wind load is the key control index for the design and construction safety of super high-rise buildings,but the load code for the design of the super high-rise buildings in China is too general and conservative.There is no clear stipulation on the value of wind load for super high-rise buildings construction.In this paper,based on the measured wind engineering site environment,combined with the load code and wind tunnel test,the wind load of the 530 m super high-rise tower of Tianjin CTF financial center is studied.At the same time,the effect of wind load on the integral steel platform system of super high-rise buildings and the luffing jib tower crane is studied.It has important engineering reference value.The wind environment of the engineering site is measured,and the high blast fluctuating wind characteristics of the engineering site are obtained.The measured results show that the discrete on direction of inflow of measured effective data is large,the turbulence intensity and the gust factor are highly correlated with the wind direction and measuring points.The measured turbulence intensity is larger than calculated values of the national standard and the Japanese norm.The measured fluctuating wind spectrum does not match the Davenport spectrum,indicating that the specific environment has its specific wind environment characteristics,can’t blindly apply thespecification.Fitting the measured wind spectrum,the fitting wind spectrum expression and the measured wind spectrum can be well matched.Based on the measured fitting wind spectrum,using the method of inertia wind load for equivalent static wind load,calculation formula of wind vibration coefficient is derived,which is smaller than the standard calculation results.Comparing the wind load specification calculation results and wind tunnel test results of super high-rise buildings with measured calculation results,the results show that the specification calculation results and the wind tunnel test results differ greatly,the measured results close to the wind tunnel test results,which further illustrate that the measured wind spectrum is more suitable for the wind environment characteristics of engineering site while the specification for wind load calculation of super high-rise buildings is too conservative.Integral steel platform system can be simplified as the single freedom system.The wind vibration coefficient calculation formula of integral steel platform can be derived from the analysis of wind vibration of platform structure,and using the finite element software analyzes the structure maximum displacement under the effect of different wind scale of two kinds of unfavorable state of integral steel platform system.It can be seen from the calculation and analysis that the lateral stiffness of the integral steel platform system is different,which leads to the sensitivity of two directions to the wind is different.The integral steel platform system design should reasonably arrange the supporting system under the combination with building structure characteristics and comprehensively consider the lateral stiffness of the platform’s two directions.The structure is very sensitive to the fluctuating wind effect,especially in the lifting condition,the wind vibration response of the structure is larger,and the fluctuating wind effect of the structural system should be fully taken into account in the design of the integral steel platform system structure.Effect of wind load on luffing jib tower crane under full load and no-load state is analyzed by FEM.The wind load is respectively imposed on the two states of luffing jib tower crane,obtaining the maximum stress of jib,the maximum stress of the tower crane,and the changing curve of tower displacement with jib elevation.The results show that the projection of the jib in the horizontal plane coincides with the diagonal of the tower section,which is the most unfavorable condition of the luffing jib tower crane.The influence of the wind load on the luffing jib tower crane is related to the elevation of jib crane.The bigger the elevation of jib crane is,the greater influence of wind load will be.The influence of the front wind direction and the wind load of back wind direction on the luffing jib tower crane are greater than the effect of crosswind wind load.However,regardless of the luffing jib tower crane in which conditions,the wind load has larger influence on the luffing jib tower crane,and it should be paid much attention on the construction management process.