Research On The Effect Of External Wind Environment On The Smoke Control Design Of Ultra High-rise Buildings

As a special building with huge volume,special standards and requirements for structure and function,super high rise building is a comprehensive embodiment of the image and economic strength of a country.In China,super high-rise buildings are mainly concentrated in the second tier cities in the southeast coastal area.Especially since twenty-first Century,no country in the world has such intensive construction demand and high rapid growth momentum,such as China.However,with the rapid development of super high-rise buildings in our country and the increasing demand for complex society,the safety performance of super high-rise buildings with dense personnel and large difficulty in evacuation is required more strictly.Smoke and exhaust design is the most important part of fire safety,and it is the core of many fire design strategies.In addition to the factors such as the city economy,the line of sight occlusion,the fire distance and the shadow,the consideration of the wind environment around the super high building mainly focuses on the influence of wind on the main structure load and the comfort of the high wind environment.Based on this,this paper focuses on the core problem of smoke prevention and exhaust design of super high-rise buildings.Through consulting the relevant literature and summarizing the previous research,this paper summarizes the existing technical specifications and the outdoor wind environment simulation status of the existing super high-rise buildings at home and abroad and the current situation of outdoor wind environment simulation,and understands the existing standards and design methods of our country.The shortage of the relevant theories and evaluation methods of outdoor wind environment are expounded,the theoretical basis and methods of the existing CFD simulation are summarized,and the simulation process of Airpak simulation software is introduced.Using Airpak software to simulate CFD,the influence of external wind environment on the design of smoke control in super high-rise buildings is studied and the corresponding evaluation and design method for the simulation results is formulated.Including the overall smoke and exhaust design strategy of building,and the reasonable layout of pressurized air intake equipment and smoke exhaust equipment in tower refuge.Through the qualitative and quantitativesimulation of the equivalent model of the super high-rise building,and the statistics and analysis of the results,the method of statistics and evaluation on the simulation results of the external wind environment is summarized,and a new idea for the design of smoke control for super high-rise buildings is put forward.Finally,the above conclusions and methods are verified and applied through the actual project of Hengda center in Hefei.The purpose of this paper is to rethink and supplement the existing design methods of smoke control and smoke extraction for super high-rise buildings,and to perfect the performance-based fire protection design standards and measures in China.