Variable-stiffness vibration isolator

Abstract

The invention provides a variable-stiffness vibration isolator which comprises an upper connecting plate, a lower connecting plate, an inner supporting seat arranged between the upper connecting plate and the lower connecting plate and an outer supporting seat sleeved outside the inner supporting seat. A gap is formed between the inner supporting seat and the outer supporting seat, the lower end of the inner supporting seat and the lower end of the outer supporting seat are both fixedly connected with the lower connecting plate, the upper end of the inner supporting seat is fixedly connected with the upper connecting plate, the upper end of the outer supporting seat is glidingly connected with the upper connecting plate through a friction-type sliding plate which comprises an upper sliding plate and a lower sliding plate which are fit vertically, the upper sliding plate is fixedly connected with the upper connecting plate, and the lower sliding plate is fixedly connected with the upper end of the outer supporting seat. The variable-stiffness vibration isolator can provide small quakeproof capability and cushioning capability in case of a slight earthquake, provide strong quakeproof capability and cushioning capability in case of a serious earthquake to satisfy the quakeproof requirements of a mid-high building in different conditions, is applied to the building and bridge construction field and can effectively lighten the influence of earthquake disasters and protect the life and property security.

Description

Technical field [0001] The invention relates to the technical field of construction engineering and bridge engineering, in particular to a variable stiffness seismic isolation support used for construction engineering structures and bridge structures. Background technique [0002] In the design of building structure, the installation of seismic isolation and damping supports can effectively reduce earthquake disasters. [0003] According to the requirements of the national standard GB50011-2001 "Code for Seismic Design of Buildings", rubber shock isolation bearings are usually used as shock isolation devices. The existing seismic isolation support generally includes laminated rubber and upper and lower partitions arranged above and below the laminated rubber. The upper and lower partitions of the seismic isolation support are respectively connected to the building through upper and lower connecting plates. . [0004] The horizontal rigidity of the existing seismic isolation support...

AI Technical Summary

Problems solved by technology

If the building uses a seismic isolation bearing with a large horizontal stiffness, when a small earthquake occurs, the external force on the isolation bearing is less than the minimum force that can deform, and the seismic isolation bearing does not deform and cannot play a role. Seismic isolation and shock absorption; if the building uses a seismic isolation bearing with a small horizontal stiffness, when a large-scale earthquake occurs, the external force on the seismic isolation bearing may be greater than the maximum force it can withstand. Excessive deformation or even destruction of the seat will endanger the safety of the building

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