Wind-induced Responses And Optimation Of High-rise Building Under Combined Aerodynamic Control

Since 20th Century,with the demand for social development,the development of science and technology,the limited resources,environment and space,tall buildings have been continuously built up.Due to its huge shape and complicated function,tall buildings have high requirements both in design and technology.Generally,wind load is the most important factor for structural design in tall buildings,so how to improve the wind-resistant performance of tall buildings has become an attractive topic in civil engineering.In this article,the combined aerodynamic control is used in tall buildings,it is a fresh method to reduce the wind load and wind-induced responses,which could change the flow fields around buildings by shape modification and supplying additional energy.In our previous work,CFD simulation and wind tunnel test were conducted systematically to investigate the characteristics of wind loads of tall buildings controlled by air suction.However,there is no suitable theory and mathematical model for quantitative analysis of the tall buildings under the combined aerodynamic control.The main contents in this paper are given as follows:1.Based on wind tunnel tests of five tall building models(including a square model,a corner-recessed model,a corner-cut model,a tapered model and a Y-type model)under suction or no suction control,wind vibration was calculated by Newmark-?method on ANSYS.Different combined aerodynamic control were evaluated considering tip displacement and acceleration.In additionally,structural frequency,damping ratio and vibration mode of tall models building under the combined aerodynamic control were considered.Shape coefficient and vibration coefficient are caculated to give the reference for structure design.2.The model of level wind force coefficient spectrum was established including level vertical&horizontal coherent function,level RMS of wind force coefficient and shape parameter,considering the influence of the suction flux coefficient C_Q,height and shape.The spectral model was tested by comparing the responses to the time domain analysis.3.CFD numerical simulation and ISIGHT was used to explore the best suction location and suction velocity on the vertical and cross section of square model by SST k-?turbulence model.The mechanism of suction control is analyzed and the best combined aerodynamic control strategy was given.This result can give the guidance for optimum design both in experiments and practical engineering...