Numerical Wind Tunnel In Research On The Vector-type Coefficient Of Complex Shape Building And On The Construction Sequence Of Curtain Wall System

With the development of economic construction and the progress of science andtechnology, a lot of high-rise and super high-rise buildings have sprung up in China inrecent years. With the application of high strength lightweight material and constantlyimprovement of the design level, the modern high-rise building develop towards thedirection of the higher, more soft, which make high-rise buildings become moresensitive to wind loads. As people living standard is increasing day by day, the trend ofdevelopment of the buildings toward more complex shapes, the impact of airflow on thesurface of a building has not been directly measured by the simple norms. For example:whether the Vector-type coefficient of complex bodies on the surface can be obtainedfrom the Load code for the designing of building structures (GB50009-2001) directlyand reliably. The emergence of the high-rise building make the curtain wall widely used,and the installations of curtain walls generally begin after the main structure completedsuccessively. Under the action of the wind, the optional of high-rise building curtainwall installation is big, and it is common that we always emphasis on spending less time,and we ignore installation sequence impact on the safety and reasonable during theprocess of installation, and always ignore wind effects on wall installation order. Thereasonable order can reduce safety accident and property loss during the curtain wallinstallation process. Therefore, in view of the above situation, the numerical windtunnel technology is applied in this paper; the related work and conclusions are asfollows:â‘ The numerical modeling and the wind pressure simulation under various winddirection angle have been carried out on the base of complex shape of high-rise building,achieving the laws of wind pressure under different wind direction angle, analyzing theeffect of narrow on the top of the throat of building based on the computed windpressure. Verifying that the law of the effect in the simulation in stranded formationlocation on the airflow, and on wind pressure plus or minus under various winddirection Angle of the surface, and on the canyons, are in conformity with the generalrule of wind flow around buildings. At the same time, the neglected canyon effect at thetop of the throat is obtained, the canyon effect under different wind direction angle isdifferent, the construction should take corresponding measures in the throat.â‘¡On the basis of air pressure, calculating the average wind pressure coefficient and Vector-type coefficient under a variety of wind direction angle, compared thevector-type coefficient with the standard value in norm and design value in designing,providing suggestions for similar projects.â‘¢Making holes on the building simulation model to simulate the condition ofuninstalled curtain wall, drawing following conclusions: holes affects the most value ofwind pressure are small, the lower layers of wind pressure distributions of open holesdifference are very small, to reduce the holes effect should try to open a small hole, theholes at the edge of the short direction of wind pressure distributions are more adverse,the position of opening holes should be in the wind pressure smaller areas. According tothe different position of wind pressure distributions of open holes, it is concluded thatthe curtain wall installation should be along the wind direction, stranded area should beinstalled firstly, and construction environment, degree of difficulty of constructionshould be combined in the installation.