Prestressed variable-stiffness three-dimensional seismic isolation support

Abstract

The invention relates to a prestressed variable-stiffness three-dimensional seismic isolation support, and belongs to the field of seismic absorption and isolation of structural engineering. On the basis of a common rubber seismic isolation support, the tensile deformation capacity of the support is enhanced through vertical seams, prestress is applied through nuts, the rubber layer is pulled, meanwhile, springs are pressed, and therefore the prestress variable-rigidity three-dimensional seismic isolation support is formed. According to the prestressed variable-stiffness three-dimensional seismic isolation support, on the basis of the common rubber seismic isolation support, the tensile deformation capacity of the rubber seismic isolation support is enhanced through the vertical seams, then self-balancing pre-tensioning and pre-pressing deformation is applied, the vertical rigidity of the seismic isolation support is mainly controlled by the springs, and when vertical deformation after seismic isolation is larger than pre-tensioning deformation, the vertical rigidity is controlled by the sum of the vertical compression rigidity of the rubber layer and the spring rigidity, so that the variable rigidity characteristic is realized; and meanwhile, vertical seismic isolation does not affect the horizontal seismic isolation effect of the rubber layer, and therefore the three-direction seismic isolation effect is achieved. The prestressed variable-stiffness three-dimensional seismic isolation support does not increase the material cost, is simple in structure, clear in mechanical property parameter and convenient to implement, and can be widely applied to three-dimensional seismic isolation analysis and design of structures.

Description

technical field

[0001] The invention relates to a structural three-dimensional shock-isolation bearing, which belongs to the field of shock-absorption and isolation in structural engineering. Background technique

[0002] With the development of the economy, many complex structures with irregular planes and spaces appear. Three-dimensional seismic isolation technology is required to reduce their seismic requirements and improve their seismic safety performance. In order to realize the three-dimensional seismic isolation of complex structures, the existing three-dimensional seismic isolation bearings are generally complicated, the mechanical properties are not clear enough, or the structure is too complicated to realize, which affects the three-dimensional seismic isolation effect of the structure. On the basis of transforming the tensile properties of the rubber layer, this patent proposes a prestressed variable stiffness three-dimensional seismic isolation bearing by introd...

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