Buckling-restrained shape memory alloy rod based self-reset damper

Abstract

The invention belongs to the field of building protection devices and discloses a buckling-restrained shape memory alloy rod based self-reset damper. The damper comprises a first connection unit, a second connection unit and a core unit. The first connection unit comprises a first side plate and a second side plate, bottoms of the first side plate and the second side plate are connected through alower bottom plate, the outer side of the lower bottom plate is used for connection with an external connection end, and tops of the first side plate and the second side plate are connected through anupper cover plate. The second connection unit comprises a third side plate and a fourth side plate, a first inner connection plate and a second inner connection plate are arranged on lower portions of the third side plate and the fourth side plate sequentially from top to bottom, upper ends of the third side plate and the fourth side plate penetrate the upper cover plate to extend outwards, and upper ends of the third side plate and the fourth side plate are used for connection with the external connection end. The core unit comprises an upper core rod and a lower core rod. The buckling-restrained shape memory alloy rod based self-reset damper is simple in structure, high in self-reset force and free of residual deformation after earthquakes, tension and compression force balance of the damper can be guaranteed in earthquakes, tension and compression actions are predictable, and building design difficulty and construction cost are reduced.

Description

technical field [0001] The invention relates to the field of protective devices for buildings, in particular to a self-resetting damper based on buckling-constrained shape memory alloy rods. Background technique [0002] Disasters caused by earthquakes have always been concerned by all walks of life. The damper can absorb or dissipate the energy input into the structure by external force through its own hysteretic deformation, reduce the seismic response of the main structure, and avoid structure damage or collapse. This kind of energy-dissipating shock-absorbing device that realizes passive structural control has attracted much attention because of its clear shock-absorbing excitation, remarkable shock-absorbing effect, simple structure, wide application range, and convenient maintenance. [0003] Dampers for construction generally include metal dampers, viscous dampers, friction dampers, etc. The mature passive dampers currently developed have a serious disadvantage, that ...

AI Technical Summary

Problems solved by technology

However, this severely limits the application of shape memory alloys. First, the diameter of the shape memory alloy wire is very small, and due to the special requirements of the structure for the force of the damper, the strength of the damper made of the shape memory alloy wire is limited, and the restoring force provided is very small. If you want to increase the self-resetting ability by winding more turns, you will face the limitation of technological difficulty; secondly, the shape memory alloy wire needs to be pre-tensioned when it is used, which is cumbersome and prone to the consequences of being broken under a large earthquake

The damper made of ordinary SMA will cause two different performances of tension and compression under the earthquake due to its own nature of tension and compression, which not only greatly increases the difficulty of structure design, but also reduces The practicality of SMA dampers

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