Negative stiffness multi-amplification energy dissipation device

Abstract

The invention relates to a negative stiffness multiple amplification energy dissipation device which comprises a damper, a first support, a second support and a negative stiffness device, and one end of the first support, one end of the second support, one end of the damper and one end of the negative stiffness device are hinged together; the two columns and the two beams form a rectangular structure, the other end of the damper is connected with a first vertex angle of the rectangular structure, the other end of the first support is connected with a second vertex angle of the rectangular structure, the other end of the second support is connected with one beam, and the other end of the negative stiffness device is connected with the other beam. Compared with the prior art, through the geometrical relationship of the first support, the second support and the damper, deformation of the damper is amplified, and the first amplification effect is achieved; through the negative stiffness effect of the negative stiffness device, the deformation of the damper is amplified to achieve a second amplification effect, and through the traction effect of the negative stiffness device, the deformation of the damper is amplified to achieve a third amplification effect; and the energy dissipation effect is improved.

Description

Technical Field

[0001] The invention relates to the field of structural seismic reduction and isolation, and in particular to a negative stiffness multiple amplification energy dissipation device. Background Art

[0002] The destruction of structures during earthquakes is an important cause of casualties and property damage. In order to reduce casualties during earthquakes, scholars have proposed many technologies. Earthquake-resistant technology is to reduce structural damage by increasing the structural section and using hard resistance. Since the larger the structural section, the greater the earthquake effect, the structural design enters a vicious circle. Based on this, shock reduction technology is further proposed. Shock reduction technology is to add dampers to the structure, dissipate the earthquake effect through the hysteresis energy dissipation or viscous energy dissipation of the damper, and achieve the purpose of reducing losses.

[0003] In recent years, the most widely used shock-absorbing product is the viscous damper. The viscous damper has no static stiffness. During an earthquake, the piston rod moves in the silicone oil to convert kinetic energy into heat energy. Its energy dissipation mechanism is clear and its design is simple, so it is deeply loved by designers. The energy dissipation of the viscous damper depends on the deformation of the damper. Due to the control of the structural bearing capacity, the interlayer deformation is limited, so the deformation of the damper is limited. Although the viscous damper has a certain energy dissipation effect in actual engineering, the effect is limited, generally between 10 and 20%, which is difficult to meet the design requirements to a certain extent.

[0004] After searching, the application publication number CN112081263A discloses a buckling restrained support cantilever truss and a composite shock-absorbing high-rise structure system, which specifically discloses: the buckling restrained support cantilever truss is connected between the inner tube and the outer tube, the diagonal web is a non-yielding load-bearing first buckling restrained support and a yielding energy-dissipating second buckling restrained support arranged in parallel, including a cantilever truss, a toggle second link, and a viscous damper, and a composite shock-absorbing high-rise structure system is formed by combining the buckling restrained support cantilever truss and a multiple displacement amplification type viscous energy dissipation mechanism. However, the energy dissipation effect of the existing technology is still difficult to meet the design requirements.

[0005] In summary, how to design a device with better energy dissipation effect is a technical problem that needs to be solved. Summary of the invention

[0006] The purpose of the present invention is to provide a negative stiffness multiple amplification energy dissipation device in order to overcome the defect of poor energy dissipation effect in the above-mentioned prior art.

[0007] The purpose of the present invention can be achieved by the following technical solutions:

[0008] According to one aspect of the present invention, a negative stiffness multiple amplification energy dissipation device is provided, which is installed on the columns and beams of a building, and includes an amplification energy dissipation component, wherein the amplification energy dissipation component includes a damper, a first support, a second support and a negative stiffness device, wherein one end of the first support, the second support, the damper and the negative stiffness device are hinged together; two columns and two beams form a rectangular structure, wherein the other end of the damper is connected to the first vertex of the rectangular structure, the other end of the first support is connected to the second vertex of the rectangular structure, the other end of the second support is connected to a beam, and the other end of the negative stiffness device is connected to another beam.

[0009] As a preferred technical solution, one end of the first support and the second support is provided with a connecting plate, the connecting plate is provided with two hinges, the damper is connected to one of the hinges on the two connecting plates, and the negative stiffness device is connected to the other hinge on the two connecting plates.

[0010] As a preferred technical solution, the amplifying and energy dissipating components are divided into two groups; the two dampers of the two groups of the amplifying and energy dissipating components are connected to two adjacent vertex corners of the rectangular structure, the two first supports are connected to the other two adjacent vertex corners of the rectangular structure, the two second supports are connected to the middle part of one beam, and the two negative stiffness devices are connected to the middle part of another beam.

[0011] As a preferred technical solution, the negative stiffness device and the viscous damper are on the same straight line.

[0012] As a preferred technical solution, the angle between the first support and the second support is 140° to 160°, and the angle between the negative stiffness device and the first support or the second support is 90°.

[0013] As a preferred technical solution, the second support and negative stiffness device are connected to the beam via a node plate.

[0014] As a preferred technical solution, the second support and negative stiffness device connect the middle part of the beam.

[0015] As a preferred technical solution, the damping coefficient of the damper is adjustable.

[0016] As a preferred technical solution, the damper is a double-piston variable-step viscous damper.

[0017] As a preferred technical solution, the double-piston variable-step viscous damper includes a housing and a piston rod. The piston rod is provided with a piston, the piston rod is installed in the housing, a seal is installed between one end of the housing and the piston rod, the housing is filled with silicone oil, and the piston is provided with an oil hole.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1) The present invention amplifies the deformation of the damper through the geometric relationship between the first support, the second support and the damper, which plays a first amplification role; amplifies the interval deformation of the structure through the negative stiffness effect of the negative stiffness device, and then amplifies the deformation of the damper, which plays a second amplification role; through the traction effect of the negative stiffness device, the deformation of the damper is amplified, which plays a third amplification role; the multiple amplification effects enable the energy dissipation device to have a better energy dissipation effect;

[0020] 2) The present invention adopts a double-piston variable-order viscous damper, which can adjust the damping coefficient under different displacements by controlling the gap, and has higher flexibility. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of a negative stiffness multiple amplification energy dissipation device of the present invention installed in a building;

[0022] Figure 2 It is a schematic diagram of the structure of the dual-piston adjustable variable-step viscous damper of the present invention;

[0023] Figure 3 This is the second magnified force analysis diagram of the damper deformation of the present invention;

[0024] The numbers in the figure show:

[0025] 1. Damper, 2. Negative stiffness device, 3. Second support, 4. First support, 5. Node plate, 6. Column, 7. Beam, 8. Seal, 9. Silicone oil, 10. Oil hole, 11. Piston. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0027] like Figure 1 As shown, the present invention provides a negative stiffness multiple amplification energy dissipation device, which is installed on the columns 6 and beams 7 of a building, and includes an amplification energy dissipation component, which includes a damper 1, a first support 4, a second support 3 and a negative stiffness device 2. The two columns 6 and two beams 7 of the building form a rectangular structure.

[0028] The damper 1, the first support 4, the second support 3 and the negative stiffness device 2 are connected by a pin shaft. A connecting plate is provided at one end of the first support 4 and the second support 3. Two hinges are provided on the connecting plate. The damper 1 is connected to one of the hinges on the two connecting plates, and the negative stiffness device 2 is connected to the other hinge on the two connecting plates. There is a certain angle when the first support 4 and the second support 3 are connected, and the angle between the two is 140-160°. The negative stiffness device 2 and the viscous damper 1 are on the same straight line, and the angle between the negative stiffness device 2 and one of the first support 4 and the second support 3 is 90°.

[0029] There are two groups of amplified energy dissipation components, two dampers 1 of the two groups of amplified energy dissipation components are connected to two adjacent vertices of the rectangular structure, two first supports 4 are connected to the other two adjacent vertices of the rectangular structure, two second supports 3 are connected to the middle of a beam 7, and two negative stiffness devices 2 are connected to the middle of another beam 7. The second supports 3 and the negative stiffness devices 2 are connected to the beam 7 through a node plate 5.

[0030] The damping coefficient of the damper 1 is adjustable. It can be a conventional viscous damper 1 or a double-piston 11 adjustable variable-step viscous damper 1. The double-piston 11 damper 1 realizes variable parameters of the damper 1 by adjusting the gap between the piston 11 and the cylinder. The parameters of the damper 1 are adjustable.

[0031] like Figure 2 As shown, the double-piston 11 variable-step viscous damper 1 includes a housing, a piston 11 rod, a piston 11 is provided on the piston 11 rod, the piston 11 rod is installed in the housing, a seal 8 is installed between one end of the housing and the piston 11 rod, the housing is filled with silicone oil 9, and an oil hole 10 is provided on the piston 11.

[0032] like Figure 3 As shown, the present invention can achieve triple amplification of the deformation of the damper 1:

[0033] The first amplification is: when the damper 1 is connected to the first support 4 and the second support 3, the deformation of the damper 1 is amplified by using the geometric principle, and the amplification principle is as follows:

[0034]

[0035] Where f1 is the magnification factor, u D is the deformation of damper 1, u is the deformation of damper 1, θ1 is the angle between the lower toggle support and the horizontal plane, θ2 is the angle between the upper toggle support and the column 6.

[0036] The second amplification is: the negative stiffness device 2 is connected to the upper and lower toggle supports, and the negative stiffness effect of the negative stiffness device 2 is amplified by the geometric principle to increase the interval deformation, thereby increasing the deformation of the damper 1. The amplification principle is as follows: Figure 3 As shown, from the force balance we can know:

[0037]

[0038] Then the horizontal component F of the damping force of the damper 1 on the rectangular structure composed of two columns 6 and two beams 7 is:

[0039]

[0040] Assuming that the negative stiffness device 2 moves and deforms in the direction u, it can be seen from the above that the deformation of the negative stiffness device 2 is:

[0041]

[0042] From the mechanical relationship of the negative stiffness device 2, it can be seen that the internal force of the negative stiffness device 2 is:

[0043]

[0044] Then the horizontal component F generated by the damping force of the negative stiffness device 2 on the rectangular structure composed of two columns 6 and two beams 7 is:

[0045]

[0046] Then the stiffness of the negative stiffness device 2 is:

[0047]

[0048] The overall stiffness of the energy dissipation device is:

[0049]

[0050] Then the interval deformation amplification factor is:

[0051]

[0052] Among them, F 负 is the output of the negative stiffness device 2, F1 is the internal force of the lower toggle support, F2 is the internal force of the upper toggle support, θ3 is the angle between the negative stiffness device 2 and the horizontal plane, K 负 is the negative stiffness effect of the negative stiffness device 2, K1 is the structural stiffness, K2 is the negative stiffness effect of the negative stiffness device 2 after amplification, K0 is the total stiffness of the structure with negative stiffness, and f2 is the interval deformation amplification coefficient.

[0053] The third amplification is: the negative stiffness device 2 plays a traction role for the damper 1 due to the negative stiffness effect, thereby amplifying the deformation of the damper 1. The amplification principle is as follows:

[0054] Due to the existence of negative stiffness device 2, when the damper 1 is deformed, the negative stiffness device 2 will generate a damping force:

[0055] F负 (t) = ηu(t)K 负

[0056] When the damper 1 undergoes maximum deformation, the negative stiffness generated is:

[0057] F 负 (t) = ηu0k 负

[0058] At this time, the dynamic stiffness (loss stiffness) of damper 1 is:

[0059]

[0060] The deformation of the damper 1 produced by the negative stiffness device 2 is:

[0061]

[0062] The maximum deformation of the damper 1 produced by the device is:

[0063]

[0064] The deformation magnification factor of damper 1 is:

[0065]

[0066] The present invention solves the problems of high cost of earthquake-resistant structures, difficulty in meeting building functional requirements, and limited shock-absorbing efficiency of shock-absorbing technology. By greatly improving the deformation of the damper 1 and increasing its energy consumption capacity, the bottleneck of existing shock-absorbing technology is broken through and the safety reserve of the structure is improved.

[0067] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present invention, and these modifications or replacements should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A negative stiffness multiple amplification energy dissipation device, which is installed on a column (6) and a beam (7) of a building, characterized in that: The invention comprises an amplifying energy dissipating component, wherein the amplifying energy dissipating component comprises a damper (1), a first support (4), a second support (3) and a negative stiffness device (2), wherein one end of the first support (4), the second support (3), the damper (1) and the negative stiffness device (2) are hinged together; two columns (6) and two beams (7) form a rectangular structure, wherein the other end of the damper (1) is connected to a first vertex of the rectangular structure, the other end of the first support (4) is connected to a second vertex of the rectangular structure, the other end of the second support (3) is connected to a beam (7), and the other end of the negative stiffness device (2) is connected to another beam (7).

2. A negative stiffness multiple amplification energy dissipation device according to claim 1, characterized in that: One end of the first support (4) and the second support (3) are both provided with a connecting plate, and two hinge points are provided on the connecting plate. The damper (1) is connected to one of the hinge points on the two connecting plates, and the negative stiffness device (2) is connected to the other hinge point on the two connecting plates.

3. A negative stiffness multiple amplification energy dissipation device according to claim 1, characterized in that: The amplifying and energy dissipating components are divided into two groups; the two dampers (1) of the two groups of the amplifying and energy dissipating components are connected to two adjacent vertices of the rectangular structure, the two first supports (4) are connected to the other two adjacent vertices of the rectangular structure, the two second supports (3) are connected to the middle of a beam (7), and the two negative stiffness devices (2) are connected to the middle of another beam (7).

4. The negative stiffness multiple amplification energy dissipation device according to claim 1, characterized in that: The negative stiffness device (2) and the viscous damper (1) are on the same straight line.

5. The negative stiffness multiple amplification and energy dissipation device according to claim 1, characterized in that: The angle between the first support (4) and the second support (3) is 140° to 160°, and the angle between the negative stiffness device (2) and the first support (4) or the second support (3) is 90°.

6. The negative stiffness multiple amplification energy dissipation device according to claim 1, characterized in that: The second support (3) and the negative stiffness device (2) are connected to the beam (7) via a node plate (5).

7. The negative stiffness multiple amplification energy dissipation device according to claim 1, characterized in that: The second support (3) and the negative stiffness device (2) connect the middle part of the beam (7).

8. The negative stiffness multiple amplification energy dissipation device according to claim 1, characterized in that: The damping coefficient of the damper (1) is adjustable.

9. The negative stiffness multiple amplification energy dissipation device according to claim 1, characterized in that: The damper (1) is a double-piston (11) variable-step viscous damper (1).

10. A negative stiffness multiple amplification energy dissipation device according to claim 9, characterized in that: The double-piston (11) variable-step viscous damper (1) comprises a housing and a piston (11) rod. The piston (11) rod is provided with a piston (11). The piston (11) rod is installed in the housing. A sealing member (8) is installed between one end of the housing and the piston (11) rod. The housing is filled with silicone oil (9). The piston (11) is provided with an oil hole (10).

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