Box-type cascaded SMA frictional compound damper

Abstract

The invention provides a box-type cascaded SMA frictional compound damper which is mainly composed of a damper box body, limiting grooves, sliding grooves, sliding plates, round stopping blocks, limiting rods, a shape memory alloy (SMA) wire, an actuating rod I, a friction block and an actuating rod II. The actuating rod I penetrates through the two sliding plates, a pair of round stop blocks is fixed to the actuating rod I, and the round stop blocks are in contact with the inner sides of the sliding plate but are not fixed. The actuating rod II penetrates through the left side wall of the damper to be fixed to the left end of the friction block. The two sliding plates are slightly lower than the side wall of the damper box body and can perform left-right sliding in the sliding grooves formed in the side wall of the damper box body, the SMA wire is fixed between the two sliding plates, the friction block is slightly higher than the side wall of the damper box body, the limiting rods are fixed to two sides and can slide in the limiting grooves formed in the side wall of the damper box body, and a round hole groove is reserved in the left side of the axis of the friction block, so that the actuating rod I can be inserted into the hole groove when moving towards the left. The maximum static friction force of the friction block is equal to the maximum pull force in the SMA wire pulling process, and it is ensured that the SMA wire works first and then the friction block instantly begins to work during great shock.

Description

technical field [0001] The invention belongs to the technical field of civil engineering and relates to passive control of structures, in particular to a box-type serial SMA friction composite damper. Background technique [0002] Passive control is a shock absorption control technology that does not require external energy. Generally, a subsystem is added to a certain part of the structure, or some components of the structure are structurally processed to achieve the dynamic characteristics of the structural system. Due to its simple structure, low cost, easy maintenance and no need for external energy support, passive control has become a hot spot in current application development. Many passive control technologies have matured and have been widely used in practical engineering. [0003] Friction damper is an energy-dissipating shock-absorbing device commonly used in engineering structures. It has the advantages of simple structure, stable performance, and strong energy d...

AI Technical Summary

Problems solved by technology

For example, the public number CN101196017A has designed a composite shape memory alloy friction damper, but the SMA unit and the friction unit work at the same time, which still cannot solve the problem that the damper is difficult to start; although the public number CN202627247U has designed a series superelastic shape memory alloy The friction damper, because it is a strip-shaped plate damper, is only fixed with high-strength bolts at one end of the friction unit, and the SMA unit at the other end has a complex structure and low overall stability

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