Study On Vibration Control Of Large-Span Shell Structure Using Rubber Bearing

Isolation devices, with rubber as material, are valued by many researchers. In this paper,based on the study of domestic and foreign scholars, development of isolation bearing, analysis of passive control of large span reticulated shell structure and the problem of parameter optimization of isolation system.Specific research contents include:(1)The structure and working mechanism of a laminated rubber bearings is introduced, According to the mechanical properties and the basic assumptions of the rubber material, Derived stiffness and damping matrix of laminated rubber bearings in the global coordinate system. Explores the methods of nonlinear analysis, numerical analysis, seismic wave selection and other issues of seismic analysis of reticulated shells isolated system. seismic analysis calculations of reticulated shells is established.(2)Take a single layer cylindrical reticulated shell for example, Response of time history of rubber bearing lattice shell system under earthquake is analyzed, Isolator can play a good control effect on vibration control of reticulated shells, the effect of vibration control of isolated structure is different under different earthquake intensity and seismic waves, in addition: energy dissipation ability increases with the increase of the earthquake intensity and the damping effect of isolation system is the best under the influence of EL Centro wave.(3)Impacting of bearing stiffness, structural span ratio and aspect ratio to seismic performance of rubber bearing lattice shell system is carried on, horizontal displacement of isolated structure decreases with the increasing of horizontal stiffness rubber bearings, other vibration parameters response increase with increasing of horizontal stiffness rubber bearings; improving bearing vertical stiffness has smaller influence to horizontal displacement of isolated structure,it has slightly positive effect to vibration control of vertical displacement of the structure,however, large vertical stiffness is less favorable for vibration control of horizontal and vertical acceleration of isolation structure;the effect of vibration control of isolation structure increase with decreasing of aspect ratio of structure, larger aspect ratio is less favorable for vibration control of displacement and acceleration of Isolated structure.