Application Of Two-stage Damper In Structural Vibration Control

Structural seismic control technology can reduce the structural response under the earthquake action,improve the structure of the resistance against natural disasters.The current development of the technology in the building seismic has been more mature,including base isolation,energy dissipation damping,active control and hybrid control method.However,the current seismic control research mostly is the study of conventional seismic records,the study of recent fault seismic records is relatively insufficient.Considering the application of displacement friction damper in the rubber base isolation structure and energy dissipation in less,we put forward a new type of friction damper,through experimental analysis and numerical calculation,study the seismic performance of two-force friction damper isolation structure and damping energy dissipation structure in different types of earthquake.The main contents of this paper are the following four aspects:(1)According to the characteristics of bolt slot and the friction damper principle,design and make a friction damper with two stage force.Its mechanical model is established based on the coulomb friction damping mechanism,and use the displacement control mode to test,verify the correctness of the mechanical model of the two-stage friction damper.The two stage is mainly composed of friction damper plate and bolt with slot,because the plate slot length is different,there will be two different friction damping force.By adjusting the preload,the damper can change its friction damping force.The damper has a good ability to adapt,the advantages of simple manufacture,convenient replacement of components,simple structure,and good stability.(2)On the basis of the two-stage friction damper,a typical six-story shear frame isolated structure is an example.Establish dynamic equations of the base isolation structure with a two-stage friction damper,then select the appropriate conventional seismic waves and near-fault seismic waves and adjust them according to seismic code,input seismic waves into the structures,compare the seismic dynamic response of the original frame structure,the base isolation structure and the base isolation structure with two-stage friction damper.By numerical analysis of the effect of two-stage friction damper control,the result shows that two-stage friction damper to control the displacement response of the structure is good,the control of the acceleration at the top story and the bottom shear is not good,basically has a tendency to increase.(3)Similarly,a typical six-story frame shear frame energy dissipation structure is an example.In the structure each story is placed a two-stage friction damper,establish dynamic equations of the energy dissipation structure with two-stage friction dampers,and then select the appropriate conventional seismic waves and near-fault seismic waves records,study the seismic response of the original frame structure and the energy dissipation structure.The results show that the two friction damper can significantly reduce the displacement of the structure,the structure of the layers average acceleration do not change significantly,the shear layers is substantially reduced,Two-stage friction damper for seismic response has excellent control effect.And adjust the parameters of the friction dampers to analyze the influence on the structural seismic control effect.(4)On the basis of the energy dissipation structure,two-stage friction damper is studied on the optimal layout problem in the six-story shear frame.In setting only placed two friction dampers and input 7 severe seismic wave conditions,use the international general evaluation index to compare the control effect of two-stage friction damper,finally determine the optimal layout of two-stage friction dampers.At the same time,the layout is optimized from the structure vibration mode,and the optimal layout principle of vibration mode is summarized.