Energy consumption limiting variable-curvature sliding friction seismic isolation support

Abstract

The invention discloses an energy consumption limiting variable-curvature sliding friction seismic isolation support which comprises an upper support plate, a lower support plate, a sliding block, a sliding plate, limit stops and stranded wires. When the support is in a normal use state, upper loads can be uniformly transferred to a lower structure; and when the support bears variable loads such as vehicle loads and wind loads, the sliding block slides in a concave curved surface formed by a first segmented curve to adapt to micro displacement of an upper structure so as to play a role of a common support. The displacement of the support under different seismic intensities is controlled, and the rigidity and damping of the support under different displacements are designed; and for multi-performance objective or multi-level seismic oscillation, the staged design is favorable for respectively optimizing given seismic fortification criterions and is suitable for performance-based bridgeseismic design. Furthermore, the support is simpler in structure, large in vertical bearing capacity, good in durability and definite in seismic isolation mechanism, and is suitable for bridges and building structures with high seismic resistance requirements.

Description

technical field [0001] The invention relates to a support device, which is a sliding friction shock-isolation support that can meet the requirements of shock isolation, energy consumption and position limitation, and has the characteristic of variable stiffness. Background technique [0002] my country is in the middle of the circum-Pacific seismic belt and the Eurasian seismic belt, especially in the western part of my country, which is mostly a strong earthquake area, with frequent seismic activities, and the earthquake resistance situation is severe. The traditional anti-seismic method mainly dissipates seismic energy (such as plastic hinge) by increasing the strength of structural members (such as increasing the section) or plastic deformation after yielding, resulting in uneconomical cost and unsightly shape; Seismic technology is to place a less rigid seismic isolation bearing between the structure and the foundation so that it can undergo relative deformation. In thi...

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Problems solved by technology

However, this type of bearing does not carry out segmental isolation design for different earthquake intensities, which is inconsistent with the existing performance-based seismic design concept, and the energy dissipation capacity of the bearing is poor

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