| With the acceleration of urban modernization,the development of long-span spatial structure has gradually attracted people's attention.The core areas of megacities are often densely packed with super-tall buildings,and at the same time,large public venues such as museums,libraries,opera houses and stadiums are planned and constructed.Most of these venues are long-span roof structures,which are sensitive to wind load.The surrounding high-rise buildings will significantly change the air flow state around them,thus affecting the wind pressure distribution characteristics of the low-span long-span roof structures and generating complex wind-induced interference effects.In this paper,wind tunnel tests and CFD(Computational Fluid Dynamic)numerical simulation software are used to study the disturbance effect of double parallel high-rise buildings on the wind load distribution characteristics of long-span flat roof.The main work is as follows:First,by monomer long-span flat roof structure of wind tunnel test,studied under different wind Angle of monomer flat roof,the average wind pressure coefficient of average wind pressure coefficient,minimum wind pressure coefficient,partition and partition minimum coefficient of wind pressure distribution,the interference effect of the research reference data obtainedAnd then to give the one building long-span flat roof structure of the wind tunnel test,in the upstream of long-span flat roof structure placed two tied for the top one building,by changing the relative position between the one building,give the one building and the relative position between the flat roof and the wind Angle,the comparative analysis to roof overall average wind pressure coefficient and roof minimum changes of the wind pressure coefficient after the interference effect.Then,by depending on the overall average wind pressure disturbance factor,the overall minimum wind disturbance factor,the average wind pressure disturbance factor and partitioning minimum wind disturbance factors such as parameters,selection of interference factors to achieve the maximum or the minimum condition is analyzed,and the further research of typical working condition of disturbance of different partitions.At last,the variation of the power spectrum in frequency domain is used to reflect the structural response before and after the disturbance.The main conclusions are as follows: For the flat roof in this test,the wind direction Angle of 240 degrees is the most unfavorable wind Angle between the average wind pressure interference factor and the minimum wind pressure interference factor,and the determination of the most unfavorable wind Angle is mainly affected by the size of the flat roof.When the two spacing ratios are at the minimum,the interference effect is mainly "slit effect",accompanied by a slight "occlusion effect".Than the spacing between the hours of one building,a disturbance factor significant amplification effect;For the typical working conditions of different partitions,flat roof edge area interference factor is the most significant amplification effect,followed by when vertical flat roof to flow the leading edge of the roof area,central area of the roof by giving one building and had a greater influence on the spacing between the flat roof than,drafting zone under the influence of wind direction Angle is significant.Finally,combining with the CFD numerical simulation software,by setting and give one same buildings in a wind tunnel test and interference factors,including applied to one building and one relative position,the interference between the buildings and the relative position between the flat roof and the wind Angle,and the comparative analysis of the data of wind tunnel tests,through analyzing the operation condition of the interference effect significantly,through the analysis of flat roof roof wind load distribution and flow field distribution features,explain the forming mechanism of the interference effect. |
PDF Full Text Request