Shape memory alloy negative stiffness damping device

Abstract

The invention relates to the technical field of energy dissipation of building structures, and discloses a shape memory alloy negative stiffness damping device. The shape memory alloy negative stiffness damping device comprises a sliding block, two first vertical plates, two second vertical plates, shape memory alloy wires, prepressing spring mechanisms and a base, wherein the two first vertical plates are oppositely arranged on the base in a first preset direction; the two second vertical plates are oppositely arranged on the base in a second preset direction; the sliding block is slidably arranged between the two first vertical plates; the two side faces, close to the two first vertical plates, of the sliding block are connected with the corresponding first vertical plates through the shape memory alloy wires respectively; the two side faces, close to the two second vertical plates, of the sliding block are connected with the corresponding second vertical plates through the prepressing spring mechanisms; and the first preset direction is perpendicular to the second preset direction. The shape memory alloy negative stiffness damping device has the following benefits that the shapememory alloy negative stiffness damping device can reduce the additional stiffness generated by a traditional damper to the building structure, the shape memory alloy wires are alternatively tensioned to achieve energy dissipation, and the shape memory alloy negative stiffness damping device can play an effective damping control role.

Description

technical field [0001] The invention relates to the technical field of energy dissipation and shock absorption of building structures, in particular to a shape memory alloy negative stiffness shock absorber. Background technique [0002] According to the survey, the collapse of building structures in earthquake disasters is the main cause of casualties and property losses. In order to reduce the damage to building structures caused by earthquakes, energy dissipation and shock absorption technologies are more and more widely used. Traditional shock absorption control mainly includes passive control, active control, semi-active control and hybrid control. Compared with other control methods, passive control is widely used because of its simple and reliable structure, no need for external energy and signal acquisition. Passive control mostly uses anti-buckling supports, viscoelastic dampers, mild steel dampers, friction dampers, etc. for shock absorption control. However, thes...

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Problems solved by technology

[0003] The invention provides a shape-memory alloy negative stiffness damping device, which can not only reduce the additional stiffness of the structure produced by the traditional damper, but also improve the traditional negative stiffness device that only provides negative Stiffness, the problem of being unable to dissipate the energy input into the structure by the earthquake, can effectively play the role of shock absorption control

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