Self-resetting Friction Dampers for Beam Bridge Seismic Isolation Systems

Abstract

The invention provides a self-resetting friction damper for a beam bridge seismic isolation system. The self-resetting friction damper comprises a damper cylinder, a friction device, a first elastic device, a second elastic device, a piston and a guide rod; the guide rod penetrates through the whole damper cylinder; the piston moves leftwards and rightwards along the guide rod and is respectively connected with the left wall and the right wall of the damper cylinder through the first elastic device and the second elastic device; the friction device is movably connected with the upper wall and the lower wall of the damper cylinder; the piston is connected with the friction device through a connecting oblique rod; a limiting device is arranged between the connecting oblique rod and the piston. The invention aims to provide the damper which has the energy-consuming capacity and a self-resetting function; the self-resetting friction damper has the frictional force to realize energy consumption when an upper structure deviates from an equilibrium position and has no frictional force in the process of returning to the equilibrium position, so that the resetting resistance is reduced; all the components of the damper are within an elastic scope in the whole process, so that a series of problems existing in the prior art are effectively solved.

Description

technical field [0001] The invention relates to the field of anti-seismic technology of girder bridges, in particular to a self-resetting friction damper used in an anti-seismic system of girder bridges. Background technique [0002] At present, domestic and foreign studies on beam bridge seismic isolation systems have proved that seismic isolation can effectively reduce the horizontal inertial force on bridge piers, thereby reducing its section bending moment and shear force, and avoiding its bending or shear failure. However, the current girder bridge isolation system generally has the following problems: [0003] (1) The seismic isolation system does not work during small earthquakes. The seismic isolation system can only be activated when encountering moderate or large earthquakes. The seismic isolation system generally does not start to function until the shear pins are cut or the shockproof blocks are broken. Relevant components of the seismic isolation system need to...

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Problems solved by technology

[0003] (1) The seismic isolation system does not work during small earthquakes. The seismic isolation system can only be activated when encountering moderate or large earthquakes. The seismic isolation system generally does not start to function until the shear pins are cut or the shockproof blocks are broken. Relevant components of the seismic isolation system need to be replaced after the earthquake, which increases the cost of post-earthquake repairs

[0004] (2) At present, the energy consumption of beam bridge isolation systems generally adopts frictional energy dissipation. In order to increase its energy dissipation capacity, the frictional force is generally designed to be larger. However, this frictional force still exists when it needs to be reset after the earthquake, preventing superstructure reset

[0005] (3) Part of the seismic isolation device uses the energy dissipation capacity of mild steel under repeated loads to achieve energy dissipation, but the energy dissipation device of this material does not have a self-resetting function

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