CN201635210U - Viscoelastic Composite Shape Memory Alloy Damper - Google Patents

Abstract

The utility model discloses a viscoelastic composite shape memory alloy damper, which comprises a traditional plate-type two-layer viscoelastic damper composed of a rectangular outer cylinder, two constraining plates, a middle plate and a viscoelastic damping plate. The preset holes in the middle of the plate-type two-layer viscoelastic damper are respectively located on the rectangular outer cylinder, the constraining plate, the middle plate and the viscoelastic damping plate, wherein the preset holes on the constraining plate are The diameter is larger than the diameter of the preset hole on the middle plate and the rectangular outer cylinder; a vertical guide rod is set in the preset hole, and two sets of parallel SMA alloys are respectively arranged between the upper and lower restraining plates and the rectangular outer cylinder. Wires, each group of SMA alloy wires is connected between the side wall of the rectangular outer cylinder and the vertical guide rod. The damper has the characteristics of multi-level energy consumption, self-adaption, strong energy consumption capacity, stable working performance, its parameters can be adjusted conveniently, and its form is simple. Promote applications.

Description

Viscoelastic Composite Shape Memory Alloy Damper

technical field

The utility model relates to a passive energy consumption device, in particular to a viscoelastic composite shape memory alloy (SMA) damper with self-adaptive capability.

Background technique

At present, the existing passive energy dissipation devices mainly include: viscous type, viscoelastic type, metal yield type, friction type and so on. The traditional plate-type two-layer viscoelastic damper generally includes a shell, which is equipped with two constraining plates and an intermediate plate, and there are two layers of viscoelastic damping plates between the constraining plate and the intermediate plate. There are connecting holes on the exposed parts of the middle plate and the middle plate. Under the action of repeated axial force, the restraint plate and the middle plate will move relative to each other, causing the viscoelastic damping plate to produce reciprocating shear deformation, thereby dissipating heat in the form of heat absorption. Movement energy.

Different types of dampers have different energy dissipation mechanisms: viscous and viscoelastic energy dissipation devices mainly use the characteristics of materials related to speed to dissipate energy, while metal yield type and friction type energy dissipation devices mainly use materials to dissipate energy in large Hysteretic energy dissipation under deformation to dissipate seismic energy. A large number of studies have shown that reasonable selection of dampers can effectively improve the seismic performance of structures. However, there are some shortcomings in the existing damping devices: for example, the materials of viscoelastic dampers are greatly affected by the environment; viscous dampers The maintenance of the friction damper remains unchanged and the comprehensive cost of use is high; the reliability of the friction damper will decrease during the long-term application process; the metal damper will produce excessive plastic deformation and cannot be restored.

As a kind of intelligent material, shape memory alloy provides a new research direction for the field of civil engineering vibration control because of its superelasticity and shape memory effect. However, how to use the superelasticity of shape memory alloy to develop a A passive energy dissipation damper with strong ability, self-resetting function, simple structure and convenient engineering application is still a challenging problem.

Contents of the invention

In order to use shape memory alloy materials and overcome the problem of unsatisfactory energy dissipation capacity of existing energy dissipation devices, the purpose of this utility model is to provide a viscoelastic composite shape memory alloy damper, which adopts two kinds of energy dissipation The components work together, have strong energy dissipation capacity, and can be conveniently applied to the vibration control of the upper brick building structure of the bottom frame.

In order to realize above-mentioned task, the technical solution that the utility model solves its technical problem adopts is:

A viscoelastic composite shape memory alloy damper, comprising a traditional plate-type two-layer viscoelastic damper composed of a rectangular outer cylinder, two constraining plates, an intermediate plate and a viscoelastic damping plate, characterized in that, in the traditional plate-type The preset holes in the middle of the two-layer viscoelastic damper are respectively located on the rectangular outer cylinder, the constraining plate, the middle plate and the viscoelastic damping plate, wherein the diameter of the preset holes on the constraining plate is It is larger than the diameter of the preset hole on the middle plate and the rectangular outer cylinder; a vertical guide rod is set in the preset hole, and two sets of parallel SMAs are respectively arranged between the upper and lower restraint plates and the rectangular outer cylinder. (Shape Memory Alloy) alloy wire, each group of SMA alloy wire is connected between the side wall of the rectangular outer cylinder and the vertical guide rod.

Other features of the utility model are:

L-shaped connectors are provided at the peripheral ends of the inner side of the rectangular outer cylinder;

One of each set of SMA alloy wires is under tension, while the other is under compression.

Each group of SMA alloy wires is connected between the L-shaped connectors at the peripheral ends of the rectangular outer cylinder and the vertical guide rods.

Each group of SMA alloy wires is arranged symmetrically.

The viscoelastic composite shape memory alloy damper of the utility model adopts the idea of hierarchical control. Under the action of small earthquakes and moderate earthquakes, the energy is only dissipated by viscoelasticity, while under the action of large earthquakes, the seismic energy is dissipated jointly by viscoelastic damping energy and SMA alloy wire hysteresis energy. The damper has the characteristics of multi-level energy consumption and strong adaptability. Its main performance, including equivalent damping and stiffness, can change with different deformation conditions during the vibration process of the structure; it has strong energy dissipation capacity, stable working performance, and structural The form is simple, its parameters can be adjusted conveniently, and it is convenient to manufacture and install. The two energy consumption mechanisms work together to have a strong energy consumption capacity. It can be popularized and applied in the new construction and renovation of buildings such as brick houses with bottom frames and upper parts.

Description of drawings

Fig. 1 is a schematic diagram of the utility model.

Fig. 2 is a top view of Fig. 1 .

Fig. 3 is an I-I sectional view of Fig. 1 .

The numbers in the figure respectively represent: 1. Rectangular outer cylinder, 2. Shape memory alloy (SMA) alloy wire, 3. Vertical guide rod, 4. Preset hole position, 5. Viscoelastic damping plate, 6. L-shaped connector , 7, M12 bolts, 8, restraint steel plate, 9, the middle steel plate.

Below in conjunction with accompanying drawing, the utility model is described in further detail.

Detailed ways

Referring to Figures 1 to 3, the viscoelastic composite shape memory alloy damper of the present invention includes a traditional plate-type two-layer viscoelastic damper composed of a rectangular outer cylinder 1, two constraining plates 8, an intermediate plate 9 and a viscoelastic damping plate 5. For the elastic damper, a hole 4 is preset in the middle of the traditional plate-type two-layer viscoelastic damper, and the preset hole 4 is respectively located on the rectangular outer cylinder 1, the restraining plate 8, the middle plate 9 and the viscoelastic damping plate 5 , a vertical guide rod 3 is set in the preset hole 4, wherein the diameter of the preset hole 4 on the constraint plate 8 is larger than the preset hole 4 on the middle plate 9 and the rectangular outer cylinder 1; Two sets of parallel SMA alloy wires 2 are respectively arranged between the block restraining plate 8 and the rectangular outer cylinder 1 , and each group of SMA alloy wires 2 is connected between the side wall of the rectangular outer cylinder 1 and the vertical guide rod 3 .

L-shaped connectors 6 are arranged around the inner side, and the L-shaped connectors 6 are firmly connected with the peripheral ends of the rectangular outer cylinder 1 through M12 bolts 7 . The preset holes 4 provided by the two-layer constraining plate 8 have the same diameter as the preset holes 4 on the upper and lower viscoelastic damping plates 5, and their dimensions are the same as the maximum displacement between elastic-plastic layers stipulated in the current specification; The preset hole positions 4 on the middle plate 9 are the same as those on the rectangular outer cylinder 1, the constraining plate 8, and the viscoelastic damping plate 5, but their sizes are different, and the specific values can be determined according to the maximum displacement between elastic layers stipulated in the current specification value. The vertical guide rod 3 is set at the preset hole position 4, and the two ends of the SMA alloy wire 2 are respectively connected with the guide rod 3 and the L-shaped connector 6 at the end of the rectangular outer cylinder 1, and each group of SMA alloy wires is symmetrically arranged.

As shown in Figure 2, the preset holes 4 of the viscoelastic damping plate are arranged in the center both vertically and horizontally. The constraining plate 8 and the extension part of the middle plate 9 are provided with connection holes to be connected with external supports.

As shown in the sectional view of FIG. 3 , the viscoelastic damping plate 5 is made of double-layer viscoelastic material; the L-shaped connecting piece 6 is connected around the inner side of the rectangular outer cylinder 1 .

In the above example, the rectangular outer cylinder 1, the middle plate 9 and the restraint plate 8 are made of Q235 steel, the thickness of the internal viscoelastic damping plate 5 is 13mm, and the thickness of the middle plate 9 and the restraint plate 8 is 8mm.

The utility model adopts viscoelastic damping plate and SMA alloy wire two kinds of energy consumption elements, utilizes the characteristic of superelastic hysteretic energy consumption of SMA alloy wire, and can apply energy to the shape memory alloy by adjusting the screw at the L-shaped connector at the fixed end. different prestrains. During the working process of the damper, the lower parts of the upper and lower constraining plates are fixed, so it can be considered that they do not participate in the movement, and only the movement of the middle plate is considered; under the action of small and moderate earthquakes, only the viscoelastic damping plate produces damping energy, and in Under the action of a large earthquake, the movement displacement of the middle plate 9 increases and touches the vertical guide rod 3, and the SMA alloy wire moves together with the guide rod. One of the gold wires in each combination bears tension and the other alloy wire bears pressure, thus forming tension and compression Type SMA alloy wire composite damper.

The diameter of the preset hole 4 of the rectangular outer cylinder 1 and the intermediate plate 9 is smaller than the diameter of the constraining plate 8 and the viscoelastic damping plate 5, and the movement displacement of the intermediate plate 9 is smaller than that of the constraining plate under the action of small and moderate earthquakes The size of the preset hole 4 of the member 8 and the viscoelastic damping plate 5 cannot touch the vertical guide rod 3. At this time, it is only viscoelastic energy consumption; and under the action of a large earthquake, when the movement displacement of the middle plate 3 exceeds a certain When a value is set, the edge of the preset hole 4 is touched to drive the guide rod 3 to move, and the movement of the guide rod 3 will drive the SMA alloy wire to reciprocate to realize hysteretic energy consumption.

Claims (5)

1. A viscoelastic composite shape memory alloy damper, comprising a traditional two-plate type consisting of a rectangular outer cylinder (1), two constraining plates (8), an intermediate plate (9) and a viscoelastic damping plate (5). The layered viscoelastic damper is characterized in that holes (4) are preset in the middle of the traditional plate-type two-layer viscoelastic damper, and the preset holes (4) are respectively located in the rectangular outer cylinder (1), the constraining plate ( 8), on the middle plate (9) and the viscoelastic damping plate (5), wherein the diameter of the preset hole position (4) on the constraint plate (8) is larger than that of the middle plate (9) and the rectangular outer cylinder ( 1) the diameter of the preset hole (4); a vertical guide rod (3) is arranged inside the preset hole (4), between the upper and lower restraining plates (8) and the rectangular outer cylinder (1) Two sets of parallel SMA alloy wires (2) are arranged respectively, and each set of SMA alloy wires (2) is connected between the side wall of the rectangular outer cylinder (1) and the vertical guide rod (3). 2 . The viscoelastic composite shape memory alloy damper according to claim 1 , characterized in that L-shaped connectors ( 6 ) are provided at the inner peripheral ends of the rectangular outer cylinder ( 1 ). 3 . 3. The viscoelastic composite shape memory alloy damper according to claim 1, characterized in that, one of said each group of SMA alloy wires (2) bears tension, while the other bears pressure. 4. The viscoelastic composite shape memory alloy damper according to claim 2, characterized in that, each group of SMA alloy wires (2) is connected to the L-shaped connectors at the ends of the rectangular outer cylinder (1) (6) and the vertical guide rod (3). 5. The viscoelastic composite shape memory alloy damper according to claim 1, characterized in that each group of SMA alloy wires (2) is arranged symmetrically.

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