Study On Hybrid Vibration Control Of Isolation And Multidirectional TMD Of High-rise Structures Under Vertical And Multidirectional Earthquakes

Earthquake disaster is one of the most serious natural disasters suffered by mankind,which will bring great threat to human life and property.Seismic wave includes horizontal seismic component and vertical seismic component.The traditional concept believes that the horizontal seismic component is the main cause of building damage,and a large number of earthquake damage phenomena and seismic records show that the impact of vertical earthquake on buildings in high intensity areas is significant.Previous studies have shown that under the action of vertical earthquake,the vertical inter story acceleration of high-rise structures will increase with the increase of floors,and the vertical acceleration of upper floors will exceed the range of comfort index allowed by the code.Firstly,based on the idea of vibration control of tuned mass damper(TMD),the vibration control systems of high-rise structures under vertical earthquake and the combined action of horizontal and vertical earthquake are studied in this paper,V-TMD(vertical TMD,V-TMD)is designed to suppress the vertical seismic response of the structure,and the combined damper system of horizontal and v-tmd(horizontal & vertical TMD,HV-TMD)is designed to suppress the multidirectional seismic response at the same time.On this basis,the base isolation strategy is introduced,and the vibration hybrid control system of high-rise structures under the combined action of vertical earthquake and horizontal and vertical earthquake is discussed respectively.The main work of this paper is as follows:(1)establish the finite element model of different vibration control strategies of high-rise structures.The 20 storey benchmark steel structure model in the third generation of structural vibration control is selected as the research object.Through the existing research results,the TMD and isolation layer with optimal parameters are designed and placed in the original structure.The finite element model of the original structure and the finite element model of structural vibration control system are established respectively by using ANSYS software.Among them,three single control systems are the finite element model of structural control system with V-TMD,HV-TMD and isolation layer,The two hybrid control systems are the finite element model of structural control system of isolation hybrid VTMD and isolation hybrid HV-TMD.(2)TMD Control of high-rise structure vibration under vertical earthquake.The vertical seismic wave components of three typical seismic waves,Elcentrol,Taft and Tian Jin wave,are selected as structural excitation.The time history analysis of the benchmark model with single V-TMD(S-V-TMD)and multiple V-TMD(M-V-TMD)is carried out by using ANSYS software.The results show that the control effect of MV-TMD on vertical interlayer acceleration is obvious,especially under the action of Taft wave,the overall control rate is 42.9%;The control effect of S-V-TMD is not ideal,and the vertical acceleration will be amplified under the action of Elcentrol and Taft waves.(3)TMD Control of vibration of high-rise structures under the combined action of horizontal and vertical earthquakes.The horizontal and vertical seismic wave components of three typical seismic waves,Elcentrol,Taft and Tian Jin wave,are selected as structural excitation.The time history analysis of the uncontrolled benchmark model with single combined damper(S-HV-TMD)and multiple combined damper(M-V-TMD)is carried out by using ANSYS.The results show that under the action of Taft wave,the overall control rate of vertical acceleration of M-HV-TMD is26.3%,and the overall control rate of horizontal acceleration is 19.8%.M-HV-TMD is better than S-HV-TMD in horizontal and vertical response.(4)TMD and isolation hybrid control of high-rise structure vibration under vertical earthquake.The vertical seismic wave components of three typical seismic waves,Elcentrol,Taft and Tian Jin wave,are selected as structural excitation,and the structural models of uncontrolled,isolated,isolated hybrid V-TMD and isolated hybrid M-VTMD are analyzed by ANSYS.The results show that compared with uncontrolled and single isolated structure models,isolated hybrid V-TMD and isolated hybrid M-V-TMD will enlarge the vertical acceleration response of the lower floor and have a good control effect on the upper structure.(5)TMD and isolation hybrid control of vibration of high-rise structures under the combined action of horizontal and vertical earthquakes.The horizontal and vertical seismic wave components of Elcentrol,Taft and Tian Jin wave are selected as structural excitation,and the structural models of uncontrolled,isolated,isolated hybrid S-HVTMD and isolated hybrid M-HV-TMD are analyzed by ANSYS.The results show that compared with uncontrolled and single isolated structural models,M-V-TMD is significantly better than S-HV-TMD in controlling the vertical response,especially under the action of Taft wave,the control rate reaches 33.9%.