A bridge isolator with horizontally anisotropic stiffness and anti-shock characteristics

Abstract

The invention discloses a bridge seismic isolator with horizontal anisotropic rigidity and anti-impact characteristic and relates to the field of bridge seismic isolation and vibration absorption. Thebridge seismic isolator with the horizontal anisotropic rigidity and the anti-impact characteristic comprises an upper pile cap, a connecting plate, a polytetrafluoroethylene sliding layer, a lower pile cap, a horizontal seismic isolation assembly and a vertical seismic isolator. According to the bridge seismic isolator with the horizontal anisotropic rigidity and the anti-impact characteristic,effective seismic isolation and vibration absorption can be carried out on a bridge support under vibrational excitation so as to overcome defects that the horizontal rigidity of the traditional rubber seismic isolator in each direction is consistent and the rigidity is invariable, the damping force of the traditional rubber seismic isolator is single and the horizontal anisotropic rigidity demandof the bridge support is not satisfied. According to the bridge seismic isolator with the horizontal anisotropic rigidity and the anti-impact characteristic, different seismic isolation effects in two horizontal directions can be realized; and moreover, rigidity and damping under different speed loads are variable; energy consuming and anti-impact effects can be effectively developed; the total mounting height is low and the making is convenient.

Description

technical field [0001] The invention relates to the technical field of bridge shock isolation and vibration reduction, in particular to a bridge shock isolator based on a shear thickening material and having horizontal anisotropic stiffness and anti-shock characteristics. Background technique [0002] In bridge engineering or other industries, bearings need to consider not only the supporting function, but also the vibration isolation and vibration reduction effect of the bearing under vibration conditions, and the displacement of the bearing along the direction of the bridge under high-speed traffic loads. . In the event of an earthquake, the horizontal and all directions of the wide bridge bearing will have a large vibration response. In order to reduce the impact of vibration on bridge piers or girders, various seismic isolation and vibration reduction methods have emerged as the times require. As a kind of vibration control field, seismic isolation technology is differe...

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Problems solved by technology

The existing friction pendulum support has the following disadvantages: a limit steel ring needs to be designed at the support, which has a large load-bearing force and complex force; the friction surface is mostly a hemispherical surface, which is difficult to process and high in cost; the vibration frequency is single and cannot meet the requirements of variable stiffness. Vibration isolation and impact resistance needs

[0005] Chinese patent (application number 201420050258.8) discloses the "Friction Pendulum Shock-Reducing and Isolating Ball Bearing". Through the design of the friction pendulum bearing, one-way friction damping or two-way friction damping can be realized, but it is limited to a single vibration frequency and lacks vertical vibration. Isolation ability

Chinese patent (application number 201620798469.9) discloses "a three-dimensional vibration isolation / vibration support with quasi-zero stiffness characteristics" through the design of friction pendulum and disc spring in series to achieve three-dimensional vibration isolation, but there is still a single vibration frequency, the structure Complicated, difficult to process and other issues

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