| Wind load is one of the control loads of super high-rise buildings,and the change of top shape of super high-rise buildings has a greater impact on overall wind load of itself and the surface wind load of top envelope structure;for appearance or functional requirements,high parapet or tower crown with different shapes maybe built on the top of these buildings.For structures like this,the overall wind load has been studied,but the wind load on its surface still lacks a unified way to get its value.In this paper,the rigid model synchronous pressure measurement technology is used to test the parapet of different heights and various tower crowns,and the effect of different heights of top parapet and different types of tower crowns on the wind load of the building is discussed.The specific work content is as follows :(1)Taking a 300-meter-high square super high-rise building as the research object,the rigid model pressure measurement wind tunnel test was used on 5 types of parapet heights and 8 types of tower crowns under two types of atmospheric boundary layer wind field conditions.And discussed the average surface wind load of structures as the parapet,the top opening,the slope and the tapered tower crown respectively.Through the comparison of the average wind pressure coefficient distribution,the wind load distribution law of high-rise buildings with different top shapes is analyzed,and the basis and suggestions for the value of the average wind load of similar structures are given.(2)The wind pressure time history Gaussian properties of 13 top shapes are analyzed,and the non-Gaussian distribution area of wind pressure is clarified.The extreme value distribution theory is used to estimate the extreme wind pressure in the non-Gaussian region,compared the influence of the top shape on the local wind load on the top of the high-rise building.Suggestions for the design of wind load values for the top envelope structure of similar high-rise buildings are provided... |
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