A Viscoelasticity-Friction Composite Damper with Variable Damping and Variable Stiffness

Abstract

The invention discloses a viscoelastic-friction compound damper with variable damping and variable stiffness, which comprises two symmetrical cylindrical viscoelastic damper units and two cylindrical friction damper units, the friction damper units are sleeved on a circular Outside of the cartridge viscoelastic damper unit. The cylindrical viscoelastic damper unit is sequentially composed of an annular inner steel cylinder, an annular viscoelastic material layer, and an annular middle steel cylinder from the inside to the outside. The middle part of the annular inner steel cylinder is provided with an elastic element, and both ends of the annular inner steel cylinder are provided with closed steel plates. , the inner sides of both ends of the annular middle steel cylinder are provided with cylindrical viscoelastic materials, and the two ends of the annular middle steel cylinder are provided with connecting anchor steel plates; the friction damper unit is sequentially composed of annular middle steel cylinder, annular friction plate, Annular friction plate, annular outer steel cylinder. The annular friction plate is divided into a first annular friction plate and a second annular friction plate. The annular outer steel cylinder is composed of an upper half annular outer steel cylinder and a lower half annular outer steel cylinder connected by bolts.

Description

technical field [0001] The invention relates to a damper, in particular to a viscoelasticity-friction composite damper with variable damping and variable stiffness, which belongs to the technical field of energy dissipation and shock absorption. Background technique [0002] Both viscoelastic and friction dampers are the most commonly used dampers in civil engineering. The traditional viscoelastic damper is a damper suitable for anti-wind vibration and small earthquake, it can start to dissipate energy under small displacement, and has good fatigue performance and energy dissipation performance. The traditional friction damper can only provide constant friction, and the damping force cannot change significantly with the increase of displacement. It provides different damping force characteristics, and the phenomenon of wear and fatigue is serious under long-term repeated small displacement (wind vibration and small earthquake). When the sliding force value of the friction ...

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Problems solved by technology

[0003] The object of the present invention is to solve the problems existing in the existing friction damper, and provide a variable damping and variable stiffness viscoelasticity-friction composite damper, which has the technical advantages of the viscoelastic damper and the variable coefficient friction damper at the same time. It can effectively reduce the vibration response of the structure under small earthquakes and wind vibrations, and enable the damper to produce good energy dissipation capacity under moderate earthquakes and large earthquakes, and has the advantage of good fatigue performance

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