Piezoelectric-SMA composite variable friction intelligent damper

Abstract

The invention discloses a piezoelectric-SMA composite variable friction intelligent damper, belonging to the field of civil engineering structure vibration damping control. The piezoelectric-SMA composite variable friction intelligent damper comprises an upper cover plate and a lower connecting fixed plate, wherein a driver horizontal locating plate fixedly connected with the upper part structure of a vibration isolating layer is positioned between the upper cover plate and the lower connecting fixed plate; the driver horizontal locating plate is provided with a plurality of SMA wire adjusting valves along the vertical direction; a plurality of SMA wires are arranged between the upper cover plate and the lower connecting fixed plate; the two ends of each SMA wire are respectively fixed on the upper cover plate and the lower connecting fixed plate; the SMA wires pass through the corresponding SMA wire adjusting valves; and a laminated piezoelectric driver is also arranged between the upper cover plate and the lower connecting fixed plate. The piezoelectric-SMA composite variable friction intelligent damper has simple structure, convenient assembly and disassembly as well as good repair capacity after vibration; the intelligent damper has self-resetting capability, higher passive damping under the condition of power failure, low initial rigidity and good vibration isolation effect; and the SMA wires can provide vertical uplift bearing capacity and supply vertical damping when in vertical vibration.

Description

technical field [0001] The invention relates to the field of vibration reduction control of civil engineering structures, in particular to a structural engineering field suitable for building shock absorption and anti-seismic and wind-induced vibration control, especially for seismic isolation engineering, and for engineering structures under the action of earthquake or wind-induced vibration. The structure reflects a damper that acts as a damper and enables semi-active control of the friction damper. Background technique [0002] The effects of earthquakes and strong winds pose a serious threat to the safety and comfort of civil engineering structures. How to effectively reduce the response of engineering structures under dynamic loads such as earthquakes and strong winds, and improve the seismic and wind resistance of structures is a major issue in civil engineering. One of the urgent problems to be solved. [0003] In the 1950s, Kobori of Japan proposed the concept of st...

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Problems solved by technology

However, the above dampers all use a single energy dissipation mechanism or a single energy dissipation element and material to dissipate energy, and the damping force (yield force) and initial stiffness provided are limited.

[0011] In order to meet the actual engineering needs, the energy dissipator (damper) must be made large enough to meet the requirements. Generally, the damping force of the energy dissipator used in building structures should be above 500kN. If the damping force is too small, the number of dampers required If there are too many, it will be very troublesome to arrange, the construction sequence and cycle will increase, and it will also affect the use of building space

Especially for semi-active control dampers, too many will lead to complex control system and reduce the reliability of the entire control system

Moreover, most of the existing dampers are unidirectional, and the dampers need to be arranged along the x and y directions in the horizontal direction. complex and difficult

[0012] (2) Vertical isolation of seismic isolation structures

First of all, the rubber isolation pad is mainly designed according to the requirements of horizontal isolation, and its vertical stiffness and damping are not optimal for vertical isolation; secondly, although the vertical seismic response of the isolation structure will not affect the The seismic isolation layer is harmful, but it may cause the upper structural column to generate a large axial seismic force, which will cause the total axial compression ratio of the structural column to exceed the allowable value

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