Application Of Fluid Viscous Damper In Wind Resistance Of Super High-rise Buildings

In recent decades,super-high-rise structures have developed rapidly in China.Due to the lack of shielding objects,the upper floors of super-high-rise buildings will be subjected to strong wind load,which will bring strong perceived vibration to the upper floors of the structure,which will cause people extreme discomfort and panic.However,only strengthening the structure of the building to resist the wind load will often bring huge economic consumption,but also make the weight of the building rise straight.Therefore,to resist wind load as the main goal of energy dissipation and vibration reduction needs have been gradually reflected,a variety of energy dissipation and vibration reduction schemes have been applied by structural engineers.The more developed and well known ones are the use of Tuned Mass dampers(TMD)to resist wind loads.However,in recent years,fluid viscous dampers have also been developed to resist wind load.In the past,fluid viscous dampers have been specially used for seismic resistance.Compared with TMD,fluid viscous dampers have many advantages.In this paper,the basic structure,working principle,design method and simulation process of fluid viscous damper are introduced in detail.In the application of fluid viscous damper to wind load resistance in super tall buildings,there are many connection modes of fluid viscous damper,which are introduced in this paper.The optimization of the connection mode can help the fluid viscous damper to play a better role,or even achieve the effect of doubling,and then reduce the number of fluid viscous dampers.In this paper,the basic structure,working principle,design method and simulation process of TMD are introduced in detail.The wind load reduction effects of fluid viscous damper and tuned mass damper are compared in detail in a case of super high-rise apartment project.The wind tunnel test results show that the acceleration of the top floor of a high-grade apartment building with a height of more than 250 m and an aspect ratio of 10.7 under wind load with a return period of 10 years is significantly higher than the comfort limit of apartments stipulated in China’s current code.Therefore,a structural protection system based on energy dissipation and vibration reduction equipment is adopted to control the floor acceleration of the structure.In this paper,three kinds of damping schemes are designed.The first one is to use 64 sets of diagonally connected fluid viscous dampers to reduce the vibration.The second is to use 58 sets of toggle connected(elbow connection)fluid viscous dampers to reduce vibration.The third is to apply a mass unit of 600 tons of TMD for vibration reduction.Through the analysis of ETABS,the effects of each scheme on the story acceleration,the story drifts and the story shear of the structure are obtained under the wind load with a return period of 10 years.The additional damping ratio of each scheme is calculated by three methods: interpolation method,standard method and energy method.And the optimal scheme is obtained by comparison.In addition,assisted seismic analysis was done.The analysis results show that a certain number of fluid viscous dampers installed in a specific connection at a specific location can have a comparable or better wind damping effect than TMD with a mass of 600 tons.