TMD System In The Study Of Multidimensional Damping Method

With the increasingly continuous development of the economy and the science and technology,the demand of the society in the construction has being changed.Long long ago,the structure form of the architecture is regular and simple.With the integrated development of building functions.modern architecture.With the development of economy and the gradual improvement of living standards,more and more attention has been paid to the research on seismic performance of buildings under earthquake.Research shows that the application of tuned mass damper system to building structures as control devices to form energy dissipation structures has been recognized by more and more experts and structural engineers.Based on some shortcomings in the use of tuned mass damper,this thesis introduces a new method of using top tuned mass damper system to absorb vibration not only horizontally but also vertically.It discusses the new method of TMD system in multi-dimensional vibration reduction,puts forward the calculation model of TMD multi-dimensional vibration reduction system,and uses finite element software SAP2000 to establish a model for the original structure of a 16-storey reinforced concrete frame and the energy dissipation structure.Under different mass,stiffness and damping of vertical TMD substructure and horizontal TMD structure,the time history analysis of seismic action is carried out for energy dissipation and shock absorption.When the mass,stiffness and damping ratio of TMD substructure,TMD structure and building are optimal,the horizontal and vertical shock absorption effects are the best.Compared with the original structure,the energy dissipation and shock absorption structure has obvious shock absorption effect.The main contents of this thesis are divided into the following three aspects:1.The horizontal damping calculation model,vertical damping calculation model,multi-dimensional damping calculation model and calculation method of multidimensional TMD damping system is proposed respectively.The design basis and calculation theory are provided for the rubber bearing of the horizontal shock absorption system.It provides design basis,calculation theory and support model for spring support and damping of vertical damping substructure.2.Through elastic-plastic time-history analysis,the mass,stiffness,maximum displacement and acceleration of different levels of TMD system,displacement time-history analysis and acceleration time-history analysis of the top storey,8-storey and the first storey of the original structure and the damping structure under the action of three kinds of seismic wave horizontal earthquakes in the 7-degree region are calculated,and the influence rules of various influencing factors of the horizontal TMD system are found out.3.Elastic-plastic time-history analysis is carried out to calculate the different mass,stiffness,maximum displacement and acceleration of each storey under the damping ratio,displacement time-history and acceleration time-history curve analysis of the top storey,the 8-storey and the first storey of the original structure and the damping structure under the action of three wave vertical seismic waves,and to find out the influence rules of various influencing factors of the vertical TMD substructure.The conclusion shows that when the mass of the horizontal TMD system is600.8 tons,the horizontal stiffness of each rubber pad support is 2280KN/m.When the equivalent damping ratio is 0.255,the horizontal damping effect is the best,and the damping rate is 35.1%~73.2%.The damping effect is the best when the mass,stiffness and damping of the TMD substructure,TMD structure and building are the best.When the mass of the vertical substructure is 329 tons,the vertical spring stiffness is 4600KN/m and the vertical damping is 370 N ?ms K /,the vertical damping reaches 30.1%~65.5%,and the vertical damping effect is good.Moreover,the influence of different mass,stiffness and damping on the structural displacement and acceleration has obvious laws,and the optimal value exists.It is verified that the multi-dimensional damping system has good multidimensional damping effect.