Study On Aerodynamic Shape Optimization Of High-rise Building Considering Aeroelastic Coupling Effect

With the buildings’ getting higher and more flexible,the aeroelastic coupling effect become more conspicuous and the wind-induced response also become more prominent.How to reduce the wind load and wind-induced effect of structure increasingly become an important problem on structural wind engineering research.The wind load on the building surface is closely related to the building shape,so it is an economic and effective way to improve the wind-resistance performance of high-rise buildings through adjusting and changing building shape.In order to improve the structures’ wind-resistance performance,it is necessary for high-rise building to consider aeroelastic coupling influence on aerodynamic shape optimization.The paper takes a200-meter height building as an object and the main research contents are as follows:Firstly,based on ANSYS Workbench platform,do a research on the one-way and two-way coupling numerical wind tunnel simulation of the high-rise building through jointing the solid analysis module and fluid analysis module and using the SST k-omega turbulence model.Comparing the the results of wind pressure on building surface,the equivalent stress and displacement response in the two different cases,it shows that the two-way coupling effect has a great influence on the analysis results.So the effect shouldn’t be ignored on the wind load calculation and structural shape optimization.Secondly,introduce the approximation models’ optimization method into the aerodynamic shape optimization of high-rise buildings,and combine with the general optimization algorithm to reduce the number of CFD numerical wind tunnel simulation analysis and improve the optimization efficiency.It can solve some problems of thehuge numerical computation that the generally directed optimization method can’t realize.Thirdly,based on the Design Exploration module in ANSYS Workbench,the42m×33m×200m rectangular building is taken as an example,its length,width and height are taken as design variables,the first natural frequency and the maximum relative displacement at the top of structure are taken as constraint conditions,and the maximum von mises stress is taken as the objective function.A single-objective optimization problem considering wind structure coupling is analyzed with using central composite design,standard response surface model optimization algorithm and NLPQL optimization algorithm.An exploration that approximation model optimization technology is applied on aerodynamic shape optimization high-rise building is achieved,and the optimum problems with continuous variables that can’t be solved by wind tunnel test is also achieved.Fourthly,based on the Design Exploration module in ANSYS Workbench,a high-rise building with chamfers is taken as an example,the width of the windward and the dimensions of the chamfer are taken as design variables,the building area,the first natural frequency of the structure and the maximum displacement at the top are taken as constraint conditions,the maximum negative pressure on building surface and the maximum von mises stress are taken as the objective functions.A multi-objective optimization problem considering aeroelastic coupling is analyzed with using box-behnken design,Kriging approximation model and MOGA optimization algorithm.It is a further exposition of the optimization method and process which considers the aeroelastic coupling effect between wind and structure.