Study On Acceleration Control Of High-rise Buildings Based On Damped-outrigger System

Under earthquake,the acceleration at the top of a high-rise building is easy to exceed the specification requirements due to its own acceleration amplification effect.Excessive acceleration will not only cause damage to the building,but also seriously affect the comfort of living.As a new structural form of high-rise buildings,"outer frame-core tube-arm" system is called traditional outrigger system when the outer end of the arm is directly connected to the outer frame column,and damped outrigger system when the outer end of the arm is connected to the outer frame column through a damper.Based on the damped outrigger system,this paper analyzes the corresponding acceleration control strategy for high-rise buildings.The main research contents are as follows:(1)Based on the distribution parameter model of damped outrigger system,both the influence of the parameters of the damper and different position of outrigger on the frequency and mode shape of the structure,and the influence of the parameters of the dampers on the damping ratio of system and energy dissipation ratio of dampers are studied.(2)Based on the random seismic response to analyze and determine the optimal parameters of damper,and to analyze the control effect of damped outrigger system under the actual earthquake records.And to analyze the active control effect of damped outrigger system based on the LQR algorithm,and the feasibility about realizing the active control effect with semi-active control force.(3)To establish the finite element model of an actual high-rise building with Open SEES,and form the vibration control equation of the structure based on the corresponding structural information extracted from the finite element model.Then to solve the structural response based on the Wilson-θ method to analyze and compare the control effect of passive control,active control and semi-active control.