Numerical Simulation On Wind Load Of Ultra-high Building Considering Fluid-Structure Interaction

Super high-rise buildings are sensitive to wind load, so accurate methods to getwind pressure on structural surface is very important for studying the wind effects onstructures. At the same time, buildings’ getting higher and more flexible makes thefluid-structure coupling effect more conspicuous. With the development of theory onwind engineering, and the upgrading of computer software and hardware, numericalsimulation has become an important choice to study wind load and wind-inducedresponse of structures besides wind tunnel test. In this paper, wind tunnel simulationscombined with wind tunnel experiment are conducted on the rigid structure and theelastic model respectively considering the interaction between the wind-inducedvibration deformation and flow field in order to study on the wind load of superhigh-rise buildings. The main work and conclusions in this thesis summarized asfollows:Firstly, through the wind tunnel test on rigid structure, the local shape coefficienton each surface of the building is obtained, local shape coefficient on structural surfaceis analyzed and averaged and finally the overall shape coefficient is obtained. Based onANSYS-CFX, this paper simulates grid model of this super high-rise building with SSTk-ω turbulence model. The results are analyzed compared with the experimentalvalues. Conclusions are drawn as follows after analysis: the results of numericalsimulation and wind tunnel test are similar and both are larger than values in Load Codefor Design of building Structure of China.Secondly, based on ANSYS Workbench and theory of dynamics similarity forstructures, this paper builds the simplified model and proceeds one-way FSI andtwo-way FSI simulation on conditions of average wind profile and fluctuating windprofile respectively using ANSYS transient analysis module and CFX flow analysismodule. In such way, the pressure on structural faces, the flow situation and thestructural vibration are obtained with the consideration of two-way FSI. The resultsshow that under the fluctuating wind profile and two-dimensional fluid-structurecoupling structural displacement response and wind pressure is greater than the resultsof average wind profile; the wind pressure considering two-way fluid-structure couplingon both condition are larger than the results of rigid model.