Ellipsoidal anisotropy friction simple pendulum support

Abstract

The invention discloses an ellipsoidal anisotropy friction simple pendulum support which comprises an upper base plate the top surface of which is a plane and the bottom surface of the which is an ellipsoidal concave surface; a lower base plate the bottom surface of which is a plane and the top surface of which is a concave spherical curved surface; a hinge sliding block arranged between the upperbase plate and the lower base plate, wherein the top surface of the hinge sliding block is an ellipsoidal convex surface matched with the ellipsoidal concave surface, and the bottom surface of the hinge sliding block is a convex spherical curved surface matched with the concave spherical curved surface. According to the ellipsoidal anisotropy friction simple pendulum support, the lower portion ofthe hinge sliding block and a groove in the upper portion of the lower base plate are spherical surfaces, and the hinge sliding block rotates in any horizontal direction through the spherical surfaces; a vertical rotating gap is formed between the hinged sliding block and a groove in the upper portion of the lower base plate, vertical rotation of the hinged sliding block is achieved when the upper base plate of the support swings horizontally, then anisotropic seismic mitigation and absorption design in the longitudinal and transverse bridge directions of a bridge is achieved, and the performance of the support is good under a rapid shearing friction test with the speed larger than or equal to 500 mm / s.

Description

technical field [0001] The invention relates to the technical field of bridges or building components, in particular to an ellipsoid anisotropic friction pendulum support for bridges or buildings. Background technique [0002] In recent years, frequent earthquake disasters have caused damage and destruction of bridge structures. As an important lifeline engineering structure, bridges play an important role in earthquake prevention and disaster reduction. Once the bridge structure is damaged by an earthquake, it will not only cause serious economic losses, but also bring great difficulties to earthquake emergency recovery and post-disaster reconstruction. Therefore, the seismic design of bridges is particularly important, especially for long bridges located in high seismic intensity and active areas, which puts forward higher requirements for the performance-based seismic isolation design of bridge structures. [0003] The main idea of ​​performance-based seismic isolation ...

AI Technical Summary

Problems solved by technology

However, the traditional friction pendulum bearing has the following disadvantages: ①The size of the bearing is huge. Generally, the sliding plate of the friction pendulum bearing is made of modified polytetrafluoroethylene or ultra-high molecular polyethylene, and the design surface pressure of the sliding plate is about 30-45MPa. In the structural design of the same tonnage support, the size of the sliding plate is large, resulting in a larger overall size of the support, which not only wastes steel, but also increases the size of the pier top cover beam, increasing the construction cost of the project; ② the height of the support is high, and some In order to avoid the vertical lifting phenomenon of the friction pendulum support, a slider with a plane friction pair is added, resulting in a higher overall height; ③ isotropic, the friction pair of the upper and lower seat plates of the traditional friction pendulum support is circular, The radius of curvature, vertical and horizontal sliding displacements in the vertical and horizontal bridge directions are the same, and it is impossible to provide different seismic isolation stiffness in the vertical and horizontal bridge directions

Therefore, traditional friction pendulum bearings cannot be designed for shock absorption and isolation according to the vibration characteristics of the bridge structure in the vertical and horizontal directions, that is, it is impossible to realize the shock absorption and isolation design of long bridges based on performance requirements.

An anisotropic friction double pendulum support provided in the prior art can decompose any angular displacement of the support into two directions, longitudinal and transverse, but the support has a four-piece structure, and the relative height of the support will be higher than that of a single The height of the pendulum support is limited and the height of the installation space of the support, the application of this type of anisotropic friction double pendulum support will be limited

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