The Research On Wind-induced Vibration Control Of High-rise Building With Damped Outrigger System And TMD System

Super-high-rise buildings have become an essential element in modern cities.With the development of structural forms,materials and technologies,the height records of engineering structures are constantly refreshed,and the flexibility of super high-rise buildings is increasing and wind-induced vibration is more likely to occur.The traditional wind-resistant design reduces the displacement by strengthening the section or setting the outrigger truss,which not only increases the cost but also has many defects.As an economical and feasible technology,passive control technology has become a common method for wind resistance design of structures besides adjusting structure arrangement and structure form.For the vibration control of the frame-core tube structure with outrigger,scholars have proposed many kinds of damped outrigger systems,including the tuned mass damper which is relatively mature in theoretical application at present,all have a certain control effect on the wind vibration response of super high-rise buildings.On the basis of the existing theories,this paper studies the wind-induced vibration control of super tall buildings with damped outrigger system and tuned mass damper system.A representative actual project is selected as an example,and an analysis model is established by ETABS,the wind load is processed by the wind tunnel test data.Analyze and compare the vibration control efficiency of the tuned mass damper and the damped outrigger system.Aiming at the shortcomings of the existence of each control system,optimize the design in two ways,the first is to optimize the design by combining the two systems to form a hybrid control method.The second is to optimize the arrangement of dampers,propose two improved arrangements of damped outrigger system and analyze their wind-induced vibration control effects.Mainly include the following contents:1.Use the analysis software ETABS to model the actual structure of a 69-story,304.2m high frame-core tube.On the basis of this model,the wind direction angle with the largest response is selected for follow-up research.2.By setting up a tuned mass damper control system,an damped outrigger control system and a hybrid control system on the example model,comprehensively compare the wind-induced vibration control effects of each scheme.The calculation results show that in this model,the control effect of the damped outrigger system is better than tuned mass damper.The hybrid control scheme can significantly improve the control efficiency.When the same control efficiency is reached,the setting of the tuned mass damper can reduce about half number of dampers.3.Combined with the existing results of topology optimization,the layout of the damper of the overarm truss is locally optimized,and the improved layout of the eccentric X-type damper and the toggle-type damper are proposed.The results show that in this model,compared with the horizontal viscous damper system,both of the two systems have a certain optimization effect on the wind vibration control of the structure.