Analysis Of Shock Absorption Performance Of Concrete Frame-core Tube Structure With TMD

In recent years,there have been a number of devastating earthquake disasters.People are increasingly aware of the limitations of using traditional methods of earthquake resistance to resist earthquake disasters.The shock-absorbing control technology with higher safety has been deeply studied and widely used.Tuned Mass Dampers(TMD)consist of a body structure and an additional tuned mass damper or substructure.The TMD device itself has a fixed mass,stiffness,and damping and is usually set at the top or some specific location of the structure.In the earthquake process,when the main structure generates a large displacement,the mass in the TMD system will always move in the opposite direction to the displacement of the structure due to inertial forces,and will apply a force opposite to the deformation to the main structure,through adjustment and reduction.Seismic structure vibration frequency to achieve damping control objectives.In the traditional sense,the TMD damping system usually needs an inertial mass body on the main body of the original structure,and it is reliably connected to the main body structure with a spring and a damper.Due to the limitations of materials and technology,it is difficult to obtain reasonable inertial mass and damping in this way.In order to obtain a good shock absorption effect,it takes a relatively high economic cost.In order to solve this problem,the high-level seismic isolation method is used to construct the TMD damping system(LRB-TMD)and applied to the concrete frame-core tube structure.The high-isolation layer composed of a lead laminated rubber shock-absorbing bearing divides the main structure into two parts.The upper part of the isolation layer serves as the substructure of the TMD damping system.This method is based on the original structure type,does not require additional quality,and has little effect on the original building appearance.In this paper,the basic structural model of the structure is established by the finite element analysis software SAP2000,and the basic characteristics of the structure such as period,frequency and mode shape are obtained through modal analysis.Under the premise of constant mass ratio,through trial and error calculations,a reasonable selection and layout scheme of the vibration isolation bearings was established,and a TMD damping structure model was established.Then use time-history analysis to obtain the data of bending moment,shear force,displacement,acceleration and other data of TMD damping structure under multi-dimensional earthquake.By analyzing the changes of the dynamic response of the original structure before and after shock absorption,it can be concluded that the TMD system composed of high isolation can effectively reduce the seismic response of the structure,and the shock absorption rate can reach 30%~35%.The above TMD system is applicable to the same frame-core tube structure.