Variable-curvature self-adaptive friction pendulum seismic mitigation and absorption bearing

Abstract

The invention relates to a variable-curvature self-adaptive friction pendulum seismic mitigation and absorption bearing. A seismic absorption period of a friction pendulum bearing adopted in the field of bridge construction is determined once the spherical radius is determined, but the fixed period results in poorer adaptive capacity of a structure. The variable-curvature self-adaptive friction pendulum seismic mitigation and absorption bearing is provided with a bispherical lining plate, wherein an upper bearing plate and a base are arranged at the upper part and the lower part of the bispherical lining plate; slide block components are arranged on the lower surface of the bispherical lining plate; a limitation plate fixed on the base and guide bar components are arranged at the periphery of the upper bearing plate; and two curved surface friction pairs are formed among the upper bearing plate, the bispherical lining plate and a variable-curvature bottom plate. According to the variable-curvature self-adaptive friction pendulum seismic mitigation and absorption bearing, resonance of the traditional friction pendulum bearing is overcome by adopting a variable-curvature surface; reliable contact between relational structures of the bearing with different curvature radiuses, and the friction surface contact adaptivity are achieved by the slide block components; local stress concentration is avoided; seismic mitigation and absorption function separation on the normal working condition and the earthquake working condition is achieved; the stress is stable and reliable; beam falling is avoided; and multistage protective seismic mitigation and absorption effects are obvious.

Description

technical field [0001] The invention belongs to the technical field of shock absorption and isolation of bridges, and in particular relates to a variable curvature self-adaptive friction pendulum type shock absorption and isolation support. Background technique [0002] In recent years, with the frequent occurrence of earthquakes in the world, how to realize earthquake resistance and disaster reduction of engineering structures has been highly valued by people. In the field of bridge engineering, in order to overcome the deficiencies of traditional structural anti-seismic technology, seismic isolation and shock-absorbing control technology are effective ways to improve the anti-seismic performance of structures. At present, shock-absorbing and isolating bearings are mostly used at home and abroad to extend the natural vibration period of the structure, dissipate the seismic energy input to the upper structure, and achieve good economic and social benefits. The integrated s...

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Problems solved by technology

At present, the traditional friction pendulum type seismic isolation bearing used in China, once the radius of the spherical surface is determined, its isolation period is also determined. However, near faults are often accompanied by long-period pulse-type seismic waves, which are easy to resonate with the structure On the other hand, although in some patent documents, it is proposed to use the method of variable curvature to eliminate the resonance phenomenon caused by long-period seismic waves, but on sliding surfaces with different curvature radii, the sliding friction pair is a local point contact, which is easy to produce Large stress concentration seriously affects the service life of the bearing

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