Research On Wind Load Characteristics Of Unequal Height Square Diffuser High-rise Buildings

With the development of urbanization,high-rise buildings are frequently used,and the effect of wind load on the high-rise building is quite conspicuous.Early work assessed the wind load characteristics of square diffuser high-rise buildings with equal height.However,the research on the wind load performance of unequal height group buildings was limited.This project has the aim of providing better understanding of the pressure on surface,the flow field and wind speed of unequal height square buildings.The research outcome will be significance for the building design guidelines.Afterwards a method of numerical simulation combined with wind tunnel tests have been presented to investigate the wind load characteristics of unequal height square buildings.The full scale model numerical simulation results have been verified by the data of test.The numerical simulation method has been used to predict the influence of height difference between buildings.At the end,The aerodynamic characteristics around the diffusion buildings has been explored by changing the distance of buildings and wind angle.It is concluded that:1)At 0° wind angle,compared with the single building model,the wind pressure on the side walls of the square diffuser high-rise building is increased by more than 50%.And the mean wind pressure coefficient and the wind speed increase and peak at 60° wind angle;2)The wind pressure coefficient increase first and then decrease because of the height difference,the maximum point occurs at the 1/6 of the building height.At 90° wind angle,the roof flow of upstream building inflows into channel,and a complex vortex area forms at the top of the channel;3)At 1/6 of the building height,the average wind pressure coefficient in channel flank is negatively correlated with wind angle.The minimum pressure coefficient of the channel side is also negatively correlated with the distance between buildings;4)The wind speed at the center of channel of the unequal height diffuser buildings increase first and then decrease,and each maximum value of the wind speed at the center of the channel is located at the 5/6 of the channel height.And the wind speed increase with increase of building height difference and the peak at 1/6 of the building height difference.In the downwind direction the wind speed of the leading edge of the channel increases significantly.