Pulling-resistant bidirectional sliding friction bearing

Abstract

The invention mainly discloses a pulling-resistant bidirectional sliding friction bearing applied to the field of bridge, flume and building engineering. The bearing comprises upper and lower bearing plates, upper and lower sliding blocks, a pulling-resistant system and a limiting pulling-resistant device, wherein the upper sliding block and the lower sliding block can horizontally slide on the upper bearing plate and the lower bearing plate respectively; and a pulling-resistant disc is embedded into a pulling-resistant spherical segment. In the state of a normal load and a small earthquake, the rotation between the pulling-resistant disc and the pulling-resistant spherical segment of the bearing adapts to that of an upper structure under the temperature and the normal load; in the state of a big earthquake, the vibration cycle of a structure system can be changed and the partial earthquake energy can be dissipated by the sliding movement of the sliding block so as to reduce the earthquake response of the upper structure; the pulling-resistant system can be used for preventing the upper structure from being overturned or collapsed due to a pulling force with the control effect caused by larger vertical ground motion component under the action of a near field and a near-fault earthquake; and the bearing is strong in pulling-resistant capability and good in durability, has a definite seismic mitigation and absorption mechanism, and is suitable for various structures such as bridges, flumes, buildings and the like with high seismic performance requirements.

Description

Technical field [0001] The invention relates to a shock-absorbing and isolating bearing device for bridges, aqueducts, buildings and other structures, in particular to an anti-lifting bidirectional sliding friction bearing. Background technique [0002] When building bridges, aqueducts, buildings and other large structures in earthquake areas, in order to reduce potential earthquake threats, seismic design of such structures must be carried out. Among them, the use of seismic isolation design is one of the effective ways to reduce the seismic damage of structures. Seismic technology is to reduce the basic frequency of the structure and prolong its vibration period by placing a less rigid seismic isolation layer between the bottom of the structure and the top surface of the foundation, thereby avoiding the main energy frequency band of ground motions and making the upper structure vibrate with the earthquake. Isolate, reduce the response of the upper structure, so as to achieve th...

AI Technical Summary

Problems solved by technology

[0006] Due to the low vertical bearing capacity and poor durability of rubber bearings, they cannot be used alone in long-span bridges, sea-crossing bridges and large structures with heavy superstructures.

The friction pendulum system has a good effect on small and medium-span bridges, but due to a single friction surface, its stiffness and damping characteristics cannot be changed during the movement of the support, it cannot resist tensile force, and it has no self-adaptability, so the scope of application is limited

Especially under strong earthquakes, the amplitude of horizontal displacement is limited, and it is difficult to ensure the large displacement of long-span bridge structures under strong earthquakes

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