Study On Seismic Performance Of Structures With Tuned Mass Dampers

In recent years, more and more large earthquake make people realize that the limitation of traditional structure to the natural disaster resilience. The research shows that the reasonable and effective way is adding control device to the structure to form the energy dissipation structure.Based on the existing problems in the use of tuned mass dampers, a new type of sub structure is presented in this paper. The new sub structure and main structure constitute the energy dissipation structure. The main idea is: In the structure, the floor slab separates from the beam or column, the wall and set the rib beam at the bottom of the floor. The lead core rubber isolation bearing is arranged between the rib and the structural frame beam, and the steel spring is arranged between the slab and the surrounding columns. The dead load and the live load on the floor are converted into the quality of substructure. Lateral stiffness and damping of rubber isolation bearing are substituted for the spring and damper of substructure.This paper introduces the basic principle of TMD damping system. Based on the study of building with TMD, vibration differential equations and computer programs are established for elastic-plastic time history analysis. Calculate the seismic responses under a variety of earthquake actions of original structure and energy dissipation structure and compare the energy distribution. And a simple and effective design method of TMD has been proposed. Get the following results.1.By analyzing the seismic response and the energy relation of the structure with TMD,it shows that the energy dissipation structure has good control effect on the seismic response of the earthquake.2.Based on the vibration mode of the structure, the influence of the substructure setting position of seismic responses of the energy dissipation structure is investigated. The results show that the effect of all the vibration mode is not ideal, and the selection of the first few vibration mode is more effective. The results showed that all the modes is selected as the effect of damping object to set the sub-structure is not ideal, and the choice of a greater impact in the first few vibration mode as damping objects has better damping effect.3.Based on the study of case model, compare the seismic responses and energy distribution under a variety of earthquake actions of original structure and energy dissipationstructure. Analysis results show that the energy dissipation structure proposed in this paper has very significant control effect on the displacement, acceleration, inter story drift angle and maximum shear force. TMD plays a full role and consumes most of the energy of the earthquake input. The energy consumption of the main structure is obviously reduced,and the main structure is protected very well.4.Based on fixed point theory and analysis a new design method of TMD is proposed.The rationality and reliability of the fixed point theory is verified by the calculation and analysis of the 12 layers steel frame structure. The results show that the method is feasible and has a certain reference value for engineering design.