CN111691566A - Dual energy consumption type damper - Google Patents

Abstract

A dual energy dissipation type damper comprises a U-shaped low-yield point steel plate, the U-shaped low-yield point steel plate is divided into two parts, an annular structure is formed by butt welding, and the U-shaped part of the U-shaped low-yield point steel plate is a hollow structure, The first side of the U-shaped low-yield point steel plate is provided with pull-out and non-shear-resistant bolt holes, the second side of the U-shaped low-yield point steel plate is provided with ordinary bolt holes, and the U-shaped low-yield point steel plate is provided between the first side and the second side. There is viscoelastic damping material, one end face of the viscoelastic damping material is connected to the first side of the U-shaped low yield point steel plate through the upper cover plate, and the other end face of the viscoelastic damping material is connected to the second side of the U-shaped low yield point steel plate through the lower cover plate . The invention improves the seismic performance of the structure, and has the characteristics of reliable performance and simple structure.

Description

A double energy dissipation damper

technical field

The invention relates to the technical field of special structures and energy-consuming shock-absorbing structures, in particular to a double energy-consuming damper.

Background technique

The traditional seismic structure is to resist the seismic action by enhancing the seismic performance of the structure itself. Under the action of strong earthquake, major stress components will be damaged greatly, which will lead to difficulty in post-earthquake repair, resulting in certain economic losses and even casualties. It can be seen that the performance goal of "not to fall in a big earthquake" can no longer meet the needs of modern society, which urgently requires new technologies to improve the seismic toughness of the structure.

Metal dampers utilize the plastic deformation of metal to dissipate energy. During an earthquake, metal dampers must enter plasticity before structural members such as beams and columns, and must enter a plastic state at the stress level expected by the design.

Metal dampers are one of the most widely used energy-dissipating damping devices because of their simple mechanical model, remarkable energy-dissipation effect, good durability and economy. However, metal dampers require relative displacement to yield to dissipate energy. Therefore, it is difficult to realize that the metal damper acts simultaneously under the action of "small earthquake", "medium earthquake" and "big earthquake", and when it is in the wind vibration cycle for a long time, the metal material is prone to fatigue effect, and the service life is limited . In addition, the metal damper has obvious influence on the lateral stiffness of the structure before and after yielding, which is inconvenient to design.

Viscoelastic damper is an effective passive shock absorption control device, which mainly relies on the hysteretic energy dissipation characteristics of viscoelastic materials to provide additional stiffness and damping to the structure, reduce the dynamic response of the structure, and achieve the purpose of shock absorption.

The viscoelastic damper has reliable performance, simple structure and convenient manufacture. It can provide rigidity and greater damping to the structure; its force and displacement hysteresis curve is similar to an ellipse, and its energy dissipation capacity is strong, which can effectively reduce the damage of the building. Wind vibration and earthquake response; has a wide range of engineering applicability. Compared with displacement type dampers, viscoelastic dampers can dissipate energy under all vibration conditions, even under small vibration conditions. The viscoelastic damper can not only be applied to the seismic and wind vibration control of the structure, but also avoids the problem of how to match the initial stiffness of the energy dissipater with the lateral stiffness of the structure that exists in other dampers.

Studies have shown that the energy dissipation capacity of viscoelastic dampers increases with the increase of frequency. At high frequencies, as the number of cycles increases, the energy dissipation capacity gradually returns to a certain equilibrium value; when the strain amplitude is less than 50%, the energy dissipation capacity gradually returns to a certain equilibrium value. The strain has little effect, but under the excitation of large strain, the energy dissipation capacity gradually returns to a certain equilibrium value with the increase of the number of cycles. It has been found that the viscoelastic damper is still not damaged when the strain amplitude reaches 300%, but when the strain amplitude reaches 150%, its hysteresis curve has become an inverse S shape, and the viscous performance decreases. Strain hardening increases and stiffness increases. Obviously, under the action of "big earthquake", the material utilization rate of viscoelastic damper is not high.

SUMMARY OF THE INVENTION

In order to overcome the above-mentioned deficiencies of the prior art, the purpose of the present invention is to provide a dual energy dissipation damper, which solves the problem of energy dissipation of the viscoelastic damper under large strain amplitude by combining the displacement type damper and the velocity type damper. The problem of insufficient capacity can also avoid the fatigue effect of the metal damper under the action of wind vibration, realize the whole process of energy consumption of the damper, improve the seismic performance of the structure, and have the characteristics of reliable performance and simple structure.

In order to achieve the above object, the technical scheme adopted in the present invention is:

A dual energy dissipation damper, comprising a U-shaped low-yield point steel plate 1, wherein two U-shaped low-yield point steel plates 1 are connected end to end to form an annular structure, and the U-shaped low-yield point steel plate 1 has two The U-shaped part is a hollow structure, the first side of the U-shaped low-yield point steel plate 1 is provided with uplift and non-shearing bolt holes 2, and the second side of the U-shaped low-yield point steel plate 1 is provided with ordinary bolt holes 3. A viscoelastic damping material 4 is arranged between the first side and the second side of the U-shaped low yield point steel plate 1 .

One end face of the viscoelastic damping material 4 is connected to the first side of the U-shaped low yield point steel plate 1 through the upper cover plate 5 , and the other end face of the viscoelastic damping material 4 is connected to the U-shaped low yield point through the lower cover plate 6 . The second sides of the steel plates 1 are connected.

The outer side of the viscoelastic damping material 4 is provided with a restraining steel plate 7 .

The upper cover plate 5 is connected to the beam through a connecting plate 8 , and the lower cover plate 6 is connected to the support through a support connecting plate 9 , and the connecting pieces are high-strength bolts 10 .

The upper cover plate 5 is provided with bolt holes opposite to the pull-out and shear-resistant holes 2 on the U-shaped low-yield point steel plate 1, and is connected by high-strength bolts 10. The lower cover plate 6 and the U-shaped low-yield point steel plate 1 are connected by high-strength bolts. 10 are connected together.

The U-shaped low-yield point steel plate 1 is formed from a steel coil with a yield point of 235 N/mm ² or 100 N/mm 2 .

The main material (base material) of the viscoelastic material 4 is a high molecular polymer with viscoelastic properties, and butyl rubber is selected as the base material, and a damping material is added by adding a modifier, and its shear modulus and loss factor should be Meet the requirements of engineering use.

The viscoelastic material 4 and the restraining steel plate 7 are bonded by a process such as vulcanization.

The said pull-resistant and non-shear-resistant bolt holes 2 are made of special foam filling materials to realize pull-resistant and non-shear-resistant connection.

The hollow structure is a U-shaped structure, the bolt holes (2) that resist pulling and shearing are symmetrically arranged strip structures, and the common bolt holes (3) are provided with a plurality of holes, which are different from those that are not resistant to pulling and shearing. The shear bolt holes (2) are correspondingly arranged up and down at the same vertical position.

The dual energy dissipation type damper of the present invention can be applied in the support frame system.

Beneficial effects of the present invention:

1) The damper can play an excellent energy dissipation effect under different intensity earthquakes.

2) Under the action of "small earthquake" and wind vibration, the U-shaped low-yield point steel plate does not participate in the work, which indirectly improves the fatigue resistance of the steel and avoids the problem that the impact of metal dampers on the structural stiffness is not clear.

3) Under the action of "middle shock", the U-shaped low yield point steel plate enters the elastic-plastic stage, which compensates the short plate of viscoelastic material with poor energy consumption under large strain, and indirectly improves the utilization rate of viscoelastic material.

4) Under the action of "big earthquake", the viscoelastic material produces large strain and the energy dissipation capacity is insufficient, while the U-shaped low yield point steel plate enters the plastic stage, which can improve the reliability of the damper's energy dissipation.

5) Due to the use of double energy-consuming dampers, the design limits of the components of the main structure can be appropriately relaxed, which can improve economic benefits.

Description of drawings

FIG. 1 is a schematic structural diagram of a dual energy dissipation type damper of the present invention.

Figure 2 is a schematic structural diagram of a U-shaped low yield point steel plate.

FIG. 3 is a schematic diagram of the structure of the viscoelastic damping material and the cushion steel plate.

Figure 4 is a schematic diagram of the structure of the upper and lower cover plates and high-strength bolts.

FIG. 5 is a schematic diagram of the application of the present invention to a support frame structure system.

FIG. 6 is a schematic diagram of the node structure of the support frame 1.

FIG. 7 is a second schematic diagram of the node structure of the support frame.

Detailed ways

The present invention will be further described in detail below in conjunction with the accompanying drawings.

As shown in FIG. 1, the dual energy dissipation damper of the present invention includes a U-shaped low yield point steel plate 1, a viscoelastic material 4 based on butyl rubber, a cushion steel plate 7 for constraining the viscoelastic material, and an assembly Acting high-strength bolts 10.

As shown in FIG. 2, the U-shaped low yield point steel plate 1 of the present invention is formed from a steel plate with a yield strength of 235 N/mm ² or a yield strength of 100 N/mm ² through coiling, and then connected by butt welding to form Afterwards, common bolt holes and pull-resistant and non-shear-resistant bolt holes 2 are arranged on the U-shaped low yield point steel plate 1 to facilitate installation.

As shown in FIG. 3, the viscoelastic material 4 and the restraining steel plate 7 of the present invention are constructed by bonding the viscoelastic material with butyl rubber as the base material and the cushion steel plate through a vulcanization process. Steel plates 5 and 6 are provided at the top, and bolt holes are provided.

As shown in FIG. 4 , in order to facilitate the installation of the connecting plate of the present invention, a connecting plate 9 is provided on the top of the support, and the connecting plate is provided with bolt holes. The connecting plate 8 is pre-embedded at the bottom of the beam, and bolt holes are provided to facilitate the installation of the damper.

The installation process of the dual energy-consuming damper of the present invention is as follows:

1) Select qualified low-yield point steel plates for rolling, and weld the rolled U-shaped steel. After welding, set bolt holes to form U-shaped low-yield point steel plates 1.

2) The viscoelastic material 4 and the restraining steel plate 7 are bonded together by a vulcanization process, and holes are made on the end cover plate.

3) Connect the bonded viscoelastic material 4 to the connecting plates 5 and 6 through high-strength bolts 10, as well as the U-shaped low yield point steel plate 1 and the connecting plates 8 and 9.

As shown in FIG. 5 , in the installation of the present invention, the double energy-consuming damper is installed at the bottom of the beam through the “herringbone” support, so that the damper can consume energy when vibration occurs between the structural layers.

As shown in Figure 6, the support connection of the present invention, at the bottom of the damper, the support and the connecting plate are connected by four-sided girth welds, the connecting plate is provided with bolt holes, and then connected to the damper through high-strength bolts.

As shown in FIG. 7 , in the support connection of the present invention, a connecting plate is pre-buried at the bottom of the support and at the beam-column node, and the support is inserted into the two connecting plates and connected by a fillet weld.

The U-shaped low-yield point steel plate 1 is made of steel with a yield point of 235N/mm ² or 100N/mm ² . The main reason for making this hollow structure is to reduce the yield load and indirectly improve the pull-out and shear-resistant bolts. The local bearing capacity of the hole 2, in addition, the arc-shaped opening can make the stress transfer uniform, and the bending yield occurs under the earthquake.

For the viscoelastic material 4, the main material (base material) of the viscoelastic damping material 4 is a high molecular polymer with viscoelastic properties, butyl rubber is selected as the base material, and a modifier is added to become a damping material, and its shear Modulus and loss factor should meet the requirements of engineering use.

The bonding between the viscoelastic material 4 and the restraining steel plate 7, the viscoelastic material has low rigidity, is easy to deform, and the design parameters are not easy to control. tied together. The vulcanization process is mature and reliable, and it has been found in previous studies that its bond strength is stronger than the shear strength of viscoelastic materials.

The upper cover plate 5 and the lower cover plate 6 are connected, and cover plates are arranged at both ends of the restraining steel plate 7, and the bolt holes provided on the upper cover plate 5 are opposite to the pull-out and shear-resistant holes 2 on the U-shaped low-yield point steel plate 1. High-strength bolt connection 10 , the lower cover plate 6 and the U-shaped low-yield point steel plate 1 are connected together by high-strength bolts 10 .

The pull-resistant and non-shear-resistant connection technology is to artificially set the sliding direction of the bolt, so that the high-strength bolt is not subject to shearing force in the sliding direction. This technology has been successfully applied to the connecting parts of steel-concrete composite beams to solve the problem of concrete cracking in the negative moment area of steel-concrete composite beams. The special foam filling material is mainly used to realize the connection of anti-pulling and non-shearing.

The dual energy dissipation type damper of the present invention can be applied in the support frame system.

The working principle of the present invention:

Under the action of wind vibration or small earthquake, the horizontal displacement of the structural floor beam drives the connecting plate 8, and the connecting plate 8 drives the upper cover plate 5 through the high-strength bolts 10 to move in the bolt holes 2 of the pull-out and shear-resistance, causing shearing of the viscoelastic material. Under the action of medium earthquake, the high-strength bolt 10 contacts the end of the bolt hole that resists pulling and does not resist shearing, and drives the U-shaped low-yield point steel plate 1 to roll, so that the low-yield point steel yields, and the viscoelastic material is different from the low-yield point steel. The yield point steel is involved in energy dissipation; under the action of a large earthquake, the viscoelastic material produces a large shear strain, and the energy dissipation capacity is insufficient. At this time, the U-shaped low yield point steel plate has a large rolling deformation, and the plastic deformation increases. Mainly by the low yield point steel to participate in energy dissipation.

According to the design principle of the anti-seismic concept, the structure should have multiple anti-seismic fortification lines to avoid damage or even collapse of the main structure due to insufficient energy consumption of the viscoelastic material under large strain. At the same time, the material advantages of low yield point steel and viscoelastic materials are rationally utilized. Under the action of "small shock" and wind vibration, the viscoelastic material dissipates energy, and the low yield point steel does not participate in the work, which indirectly improves the fatigue performance of the steel; under the action of "medium shock", the low yield point steel and viscoelastic material work at the same time , the energy consumption is reliable; under the action of the "big earthquake", the energy consumption of the viscoelastic material is insufficient, and the energy consumption of the low yield point steel increases greatly, which compensates for the short board of the insufficient energy consumption of the viscoelastic material.

Claims (10)

1. The utility model provides a dual power consumption type attenuator, its characterized in that, includes U-shaped low yield point steel sheet (1), U-shaped low yield point steel sheet (1) be two, end to end forms ring structure, the U-shaped department of U-shaped low yield point steel sheet (1) be hollow out construction, U-shaped low yield point steel sheet (1) first side seted up resistance to plucking bolt hole (2) that does not shear, U-shaped low yield point steel sheet (1) second side seted up ordinary bolt hole (3), U-shaped low yield point steel sheet (1) first side and second side between be provided with viscoelastic damping material (4).

2. A dual dissipative damper according to claim 1, wherein one end of the viscoelastic damping material (4) is connected to the first side of the U-shaped steel plate (1) with low yield point through the upper cover plate (5) and the other end of the viscoelastic damping material (4) is connected to the second side of the U-shaped steel plate (1) with low yield point through the lower cover plate (6).

3. A dual dissipative damper according to claim 1, wherein the viscoelastic damping material (4) is provided with a restraining steel plate (7) on the outside; the viscoelastic material (4) and the constraint steel plate (7) are bonded through a vulcanization process.

4. A dual dissipative damper according to claim 1, wherein the upper cover plate (5) is connected to the beam by means of a connecting plate (8), the lower cover plate (6) is connected to the support by means of a support connecting plate (9), and the connecting piece is a high strength bolt (10).

5. The dual energy dissipation type damper as recited in claim 4, wherein the upper cover plate (5) is provided with bolt holes opposite to the anti-pulling and non-shearing resistant holes (2) of the U-shaped low yield point steel plate (1) and is connected through high-strength bolts (10), and the lower cover plate (6) is connected with the U-shaped low yield point steel plate (1) through the high-strength bolts (10).

6. A dual dissipative damper according to claim 1, wherein the U-shaped steel sheet (1) with low yield point has a yield point of 235N/mm²Or 100N/mm²Rolling and forming the steel material.

7. The dual energy dissipation type damper as recited in claim 1, wherein the main material of the viscoelastic material (4) is a high molecular polymer with viscoelastic properties, butyl rubber is selected as a base material, and a modifier is added to form the damping material, so that the shear modulus and the loss factor of the damping material meet the engineering use requirements.

8. The dual dissipative damper according to claim 1, wherein the anti-pulling and anti-shearing bolt holes (2) are made of special foam filling material to achieve the anti-pulling and anti-shearing connection.

9. The dual energy dissipation type damper as claimed in claim 1, wherein the hollowed-out structure is a U-shaped structure, the anti-pulling and non-shearing bolt holes (2) are symmetrically arranged in a strip-shaped structure, and a plurality of common bolt holes (3) are arranged to correspond to the anti-pulling and non-shearing bolt holes (2) at the same vertical position.

10. Use of the dual dissipative damper of claim 1 in a braced frame system.

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