Simulation Of Wind Load Response Of Super High Buildings Considering Fluid-solid Coupling Effect

With the improvement of theoretical research,the innovation of high-strength lightweight material and the breakthrough of construction technology,high-rise and ultra-high-rise buildings develop rapidly,but they are vulnerable to wind load.And it has become an important concern to analysis of wind load and wind-induced response of high-rise and ultra-high-rise buildings.At present,the wind load design of high-rise and ultra-high-rise buildings mainly depends on wind tunnel experiments,but it is expensive and takes a long time,and the deficiency of the scale model cannot be avoided.Numerical wind tunnel is used to simulate and analyze the fluid-solid coupling effect of structures in wind environment,which can promote the safety design,safety check and applicability evaluation of high-rise and ultra-high-rise buildings.This paper studied the fluid-solid coupling response of wind load in ultra-high-rise buildings.The beam elements,shell elements and solid elements have been used to model the building,and the reliability and accuracy of the numerical wind tunnel have been verified,and the response of important components in building under wind load has been analyzed.First of all,based on the CFX and Static Structural modules in ANSYS Workbench,the full-size CAARC(Commonwealth Advisory Aeronautical Research Council)standard tall building model was simulated considering unidirectional fluid-solid coupling to analyze the distribution law of wind speed and wind pressure in the flow field,the distribution law of wind pressure on the surface of the building model,the wind pressure coefficient,the shape coefficient of wind load and the displacement of the apex of the structure under wind load.And then compared with the experimental data of wind tunnel in domestic and foreign research institutions and the data in national standards,so as to analyze the accuracy and reliability of the four turbulence models.Then,based on the CFX and Transient Structural modules in ANSYS Workbench,the full-size CAARC standard tall building model was simulated considering bidirectional fluid-solid coupling to analyze the distribution of wind pressure on the surface of the building model,the time history of the wind pressure coefficient,the shape coefficient of the wind load and the displacement time history of the apex of the structure.And then compared with the data of the simulation considering unidirectional fluid-solid coupling and the data in national standards,so as to verify the necessity and rationality of bidirectional fluid-solid coupling under wind load.At last,taking Canton East Tower as an example,a finite element model was established with the beam element and the shell element,and the structure was simulated with unidirectional and bidirectional fluid-solid coupling under the average wind load to analyze the distribution law of wind speed and wind pressure in the flow field,the distribution law of wind pressure on the structure surface,the wind pressure coefficient,the shape coefficient of wind load,the displacement of the apex of the structure and the lateral displacement limits.And then compared with the data in national standards and directly assessed the response of the important components in the structure under wind load.