Trigger type displacement locking friction pendulum support

Abstract

The invention relates to a trigger type displacement locking friction pendulum support which comprises an upper spherical plate, a double-spherical-surface sliding block, a lower spherical plate, a plane sliding plate, a limiting steel ring and an anti-shear pin unit. An upper spherical surface friction pair is formed between the upper spherical surface plate and the double-spherical-surface sliding block, a lower spherical surface friction pair is formed between the double-spherical-surface sliding block and the lower spherical surface plate, and a plane friction pair is formed between the lower spherical surface plate and the plane sliding plate. The upper spherical plate, the double-spherical-surface sliding block and the lower spherical plate jointly form a friction pendulum unit, and a positioning module matched with the lower end of the anti-shear pin unit is arranged on the plane sliding plate; and the anti-shear pin unit is sheared off under the effect of an earthquake, so that the anti-shear pin unit falls down until the anti-shear pin unit is limited in the positioning module. Compared with the prior art, in normal use, the support slides in a plane, the anti-shear pin is sheared off in an earthquake, the plane friction pair is triggered to be locked, the friction pendulum unit works, the structure is simple, force transmission is reliable, post-earthquake maintenance and repair are convenient, and the support is suitable for application and popularization.

Description

technical field [0001] The invention relates to the technical field of bridge engineering, in particular to a trigger type displacement locking friction pendulum support. Background technique [0002] Friction pendulum bearings are widely used in the reduction of highway bridges, railway bridges, and urban rail transit bridges due to their high vertical bearing capacity, significant energy dissipation effect, strong self-resetting ability, and adaptability to large displacements and large rotation angles. In isolation design. In girder bridges, due to the consideration of bridge maintenance and driving comfort, the use of expansion joints is often reduced in bridge design to improve bearing capacity, driving comfort, and reduce bridge maintenance costs. Super-long continuous girder bridges; for long-span arch bridges, cable-stayed bridges, and suspension bridges, the span of the structure itself is relatively large. Under the action of temperature, these bridges have large...

AI Technical Summary

Problems solved by technology

Under the action of temperature, these bridges have large beam expansion and contraction displacement. If a conventional friction pendulum support is used, it will cause a large vertical lift of the beam at the support, causing the bridge head to jump or even the train to derail. Applications present challenges

[0003] The current industry standard "Friction Pendulum Type Seismic Isolation Bearings for Highway Bridges JT / T 852-2013" proposes a friction pendulum bearing with three sliding surfaces. The planar sliding surface and the spherical sliding surface work together, although the excessive vertical lift of the support under the action of temperature is alleviated, but it leads to a section of void in the constitutive structure of the support, especially in long-span long-span bridges. The distance is relatively large, resulting in the failure to achieve the desired shock absorption effect

[0004] In addition, in order to realize the smooth transformation of the support from plane sliding to single pendulum motion under earthquakes, a combination system of velocity locking device and friction pendulum support has been proposed, but the conventional fluid velocity locking device is large in size and difficult to attach to the support. Above; the structure of the mechanical speed lock device is complicated, and its long-term reliability is doubtful

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