Study Of Wind-Induced Vibration And The Effects Of Tower Crown On Wind-Induced Response In Super-High-Rise Buildings

Wind load is the control load in the design of super high-rise buildings,and it is also one of the important factors that restrict the height development of super high-rise buildings.Wind-induced vibration of super high-rise buildings is an important topic in the research of building wind resistance design.The natural vibration characteristics of a square-section building in two horizontal directions are similar.Under the action of strong wind,the wind-induced vibration in the two directions has a coupling effect,and this coupling effect also has a great influence on the wind-induced vibration of high-rise buildings.In addition,as a kind of envelope structure on the top of a super high-rise building,the tower crown has different functions and shapes,and the wind load on it has a greater impact on the overall wind load and wind-induced response of the structure.Therefore,through small changes to the structure shape The way to reduce wind load or wind-induced vibration has become one of the research directions of wind-resistant design of super high-rise buildings.This paper uses the aeroelastic model to study the wind-induced vibration of high-rise buildings under the coupling effect of two horizontal directions and the influence of different tower crowns on the wind-induced response.Wind tunnel tests were conducted on square-section super high-rise buildings without tower crowns and six different top tower crowns under the atmospheric boundary layer wind field.Wind-induced vibration of square cross-sections under different wind angles and different roughnesses and the effect of tower crown on wind-induced vibration were discussed.The specific work content is as follows:(1)The test tested the wind-induced response of 7 different top shapes in the atmospheric boundary layer wind field.Among them,the structure without tower crown was tested in the uniform flow and the atmospheric boundary layer wind field.Based on the test data,the top of the super high-rise building was analyzed.Wind-induced vibration characteristics(displacement response,acceleration response and the probability density of amplitude),the vibration coupling effect of two horizontal and perpendicular directions,the amplitude and the influence of different tower crowns on the wind-induced vibration of super high-rise buildings.(2)Discuss the structural vibration characteristics and changes in vibration magnitude under different wind direction angles,and give the favorable wind direction angle of the structure corresponding to each different top shape,and provide suggestions for the selection of the shape and direction of the top tower crown of the super high-rise building.