Study On Combination Method Of Extreme Wind-induced Effects Of Super High-rise Buildings

With the development of modern super high-rise buildings in a higher and softer direction,the influence of transverse and torsional wind loads is becoming more and more obvious,and the proportion in the overall response of the structure is getting larger and larger.At this time,it is necessary to consider the common load components Effects,and the current regulations on the combined effects of wind effects are not comprehensive.Therefore,studying the combined characteristics of the extreme values of the response components of each wind load has important theoretical research value in engineering applications.This article first analyzes the applicability of existing wind load combination methods,and on this basis,studies the combined effects of super high-rise buildings with high aspect ratio,high flexibility,and high aspect ratio.The main contents are as follows:(1)Parametric analysis of the existing combination methods to illustrate the effectiveness and limitations of the existing combination methods,and to modify some of the existing combination methods to make the calculated value closer to the actual response value of the building structure.(2)On the basis of the rigid model test,firstly,the relationship between the threedimensional wind load of the super high-rise building with high aspect ratio and the variation law of wind field type and wind direction angle is studied;secondly,the wind load of the super high-rise building with high aspect ratio is analyzed The correlation of response,probability density distribution,response ratio varies with wind field type and wind direction angle.Finally,the wind load combination effect of super high-rise building with high aspect ratio is calculated.(3)On the basis of the aeroelastic model test,the cross-wind vibration form was first analyzed,distinguishing between the vortex-induced resonance and vortex-induced resonance stages;secondly,the super high-rise was studied before the vortex-induced resonance and the vortex-induced resonance stage.Correlation of building wind load response,probability density distribution,response ratio with stiffness ratio,generalized mass change law;finally,the combined effect of wind load on highly flexible super high-rise building is calculated.(4)Based on the wind tunnel test of the high-rise hotel in the Yangtze River International Conference Center,the three-dimensional wind load correlation of the high-aspect ratio highrise hotel was first analyzed;secondly,the correlation of the wind load response of the highrise hotel with a high aspect ratio was analyzed,The variation law of probability density distribution and response ratio with wind field type and wind direction angle;finally,the wind load combination effect of super high-rise building with high aspect ratio is calculated.