Damping Effect Laminated Rubber Base Isolated Structure Analysis

Laminated rubber bearing base isolation structure is developed rapidly in recent years. Base-isolated structures in structural testing and engineering practices have shown a good seismic performance, which attracted academics and engineering of attention and in-depth research. Base-isolated system is a passive seismic control system, which is different from traditional anti-seismic structure system, it is not the use of structures and structural elements to absorb seismic energy and consumption, it is set on the basis of laminated rubber bearings at the top of the structure, through isolation there is a greater level of horizontal displacement, prolonged vibration periodic structure, thereby effectively blocking the seismic energy is passed to the upper structure.In this paper,a seven-storey steel reinforced concrete frame structure is used as an example.The finite element analysis software SAP2000 is used to analyzes the seismic response of the isolated stucture and traditional seismic stucture.The EL-Centro wave and lanzhouwave are chosen as the input seimic wave.By comparison,the author verify the effectiveness of the isolation and the feasibility of the isolated stucture.The results illustrate that the structure with basement isolation can effectively reduce the horizontal earthquake response,the isolation layer of base-isolated structure gives full play to its large deformation and disipate the earthquake energy under horizontal earthquake action.It makes the deformation concentrated on isolation layer and inhibits horizontal earthquake action transfer to the superstructure, and greatly decreases story drift, the storey shear force, acceleration of the superstructure.The superstructure with the isolation layer moves horizontally.The seismic damage of horizontal earthquake action to the superstructure is greatly reduced.Meanwhile, the paper also studied the effect of vibration isolation of changing the isolation layer location and the height-width ratio. Studies show that with the isolation layer is disposed on the shift position, the isolation effect will weaken; increasing height-width ratio, isolation effect will not necessarily weaken, but the high height-width ratio will make overturning.