WO2018099026A1

WO2018099026A1 - Multi-level shock-absorbing and graded-yielding metal damper

Info

Publication number: WO2018099026A1
Application number: PCT/CN2017/086802
Authority: WO
Inventors: 陈云; 刘涛; 蒋欢军; 万志威
Original assignee: 海南大学
Priority date: 2016-11-30
Filing date: 2017-06-01
Publication date: 2018-06-07
Also published as: CN107060124A

Abstract

A multi-level shock-absorbing and graded-yielding metal damper, comprising at least two annular dampers (1, 2) that are coaxially arranged from inside to outside, the two adjacent annular dampers (1, 2) having an interval therebetween and being connected by means of a connection pad (3), and the two annular dampers (1, 2) being used for connecting to a building structure. When the dampers bend and deform, the annular damper (2) located in the relatively inner ring yields prior to the annular damper (1) located in the relatively outer ring. Said damper can produce good shock absorbing and energy dissipation effect respectively in small, moderate and violent earthquakes.

Description

Multi-level shock absorbing graded yield metal damper

Technical field

The invention belongs to the field of energy dissipation and shock absorption of building structures, and relates to a shock absorbing graded yield damper.

Background technique

Energy dissipation technology is a widely used seismic technology in the world, and has been widely used at home and abroad. Various types of dampers have been developed, such as viscous fluid dampers, viscoelastic dampers, friction dampers and magnetorheological dampers, among which metal dampers are durable, easy to construct due to their low production cost. The maintenance and replacement costs are relatively low, and it is currently the most widely used in the field of engineering structure damping.

The metal damper uses the plastic hysteresis deformation generated when the metal material yields to dissipate the seismic input structure energy, which can effectively reduce the vibration response of the structure. However, most of the existing metal dampers are the medium-shock yield energy, which results in a limited increase in the yield bearing capacity of the damper during large earthquakes. The damper does not play a greater role in large-scale earthquakes. . There is also a part of the metal damper that suffers from the yield energy of the metal damper when it is subjected to a large earthquake, and is generally in the elastic phase during the mid-earthquake, and does not consume energy, so that the damper cannot dissipate the earthquake in the middle earthquake. The role of energy. In addition, more metal dampers are in a state of elasticity during small earthquakes and do not perform energy dissipation.

Therefore, it is of great significance to develop a graded yield metal damper for different waterproofing standards, that is, the yielding of some members of the metal damper during small earthquakes or medium earthquakes, and the graded yield dampers of all members of the metal damper during large earthquakes. .

Summary of the invention

In order to overcome the defects existing in the prior art, a multi-level shock grading yielding metal damper is provided to achieve a good damping effect of grading yielding of the damper under different waterproofing conditions.

To achieve the above object, the solution of the present invention is to provide a multi-level shock grading yielding metal damper comprising at least two annular dampers provided in a coaxial inner jacket, Two adjacent annular dampers are spaced apart and partially connected by a connection pad, two of the annular dampers are for connecting with the building structure; when bending deformation, the annular damping is relatively at the inner ring The device preferentially yields more than the annular damper that is relatively in the outer ring.

Preferably, each of the annular dampers comprises an arc segment at both ends and an intermediate segment connected between the arc segments at both ends, the intermediate segment being provided with an enlarged connecting plate, the connecting pad clamping connection Between two inner and outer two annular dampers, between the two enlarged connecting plates.

Preferably, the connection position of the curved segment and the intermediate segment is smoothly transitioned to prevent stress concentration.

Preferably, each of the enlarged connecting plates is provided with a screw hole, and the enlarged connecting plate is bolted to the connecting pad.

Preferably, the multi-level shock grading yielding metal damper is disposed at a coupling beam of the joint shear wall and connected to the non-yield section of the coupling beam by a high-strength bolt, the non-yield section being embedded in the The joint shear wall.

Preferably, the annular damper is made of a metal material, including a low yield point steel or Q235 steel, and the inner and outer two annular dampers are made of the same material or different materials, and the inner and outer two annular dampers respectively Have different yield displacements.

Preferably, the maximum lateral deformation amount of the inner and outer annular dampers in design displacement is calculated by finite element simulation, and the thickness of the connecting pad is greater than the maximum lateral deformation amount; in the design process of the damper According to the different target displacement requirements of the structure under different waterproof quasi-earthquakes, the relative displacement of the damper under different waterproofing conditions is calculated from the target displacement requirements of the structure, and then the inner and outer ring dampers are determined by finite element simulation and experiment. size of.

Preferably, the joint shear walls have a slab between the joint beams, and the design displacement is smaller than a vertical clear distance between the multi-level grading yielding metal damper and the floor slab.

Preferably, the number of the annular dampers is three, and the intermediate sections adjacent to the annular dampers are connected by a connecting pad for energy consumption by yielding at three different magnitudes.

Preferably, the multi-level damping graded yield metal damper is supported between the layers of the frame structure to grade the yield energy, and the metal damper can be supported on the frame structure through the wall.

Preferably, the annular damper is cut from a single metal plate or a plurality of metal plates are welded and spliced together.

Due to the above technical solution, the beneficial effects of the multi-level shock grading yielding metal damper of the present invention include:

1) The damper is graded and yielded under different waterproofing standards, which can dissipate seismic energy of different strengths to the greatest extent and significantly reduce the vibration response of the structure. This is the greatest advantage of the present invention.

2) The annular damper of the present invention has a strong deformability, that is, an inner ring that preferentially yields in a small earthquake or a medium earthquake, and still does not break during a large earthquake, and can continue to effectively exert energy consumption, which is a large Advantage.

3) The anti-seismic mechanism of the invention is clear, the cost is low, the processing is easy, the construction is convenient, the energy consumption effect is remarkable, and it is easy to disassemble and replace after the earthquake.

4) The invention can be conveniently installed between the span of the coupling beam or the layer of the frame, which can improve the overall rigidity of the structure under normal use conditions; and can exert the graded yield energy for earthquakes of different strengths during an earthquake. The role of effectively reducing the vibration response of the structure has broad engineering application prospects.

DRAWINGS

1 is a three-dimensional schematic view of a multi-level shock absorbing graded yield metal damper according to a first embodiment of the present invention;

2 is a schematic view showing the front structure of a multi-level shock grading yielding metal damper;

Figure 3 is a schematic side view corresponding to Figure 2;

4 is a schematic plan view corresponding to FIG. 3;

Figure 5 is a plastic strain cloud reference diagram of a multi-level shock grading yielding metal damper under medium earthquakes simulated by ABAQUS;

Figure 6 is a plastic strain cloud reference diagram of a multi-level shock grading yielding metal damper under large earthquakes simulated by ABAQUS;

Figure 7 is a hysteresis curve reference diagram of the ABAQUS simulated multi-level shock grading yielding metal damper;

FIG. 8 is a schematic view showing the overall cross-sectional structure corresponding to the application implementation state of FIG. 1. FIG.

Among them, the label in the figure:

1-outer ring damper; 2-inner ring damper; 3-connecting pad; 4-connected beam non-yield section; 5-shear wall wall limb; 6-floor plate; 7-high strength bolt; 98-screw hole; 99-Expand the connecting plate.

detailed description

The invention will now be further described with reference to the embodiments shown in the drawings.

Embodiment 1:

1 and 8, the present invention provides a multi-level shock grading yielding metal damper which is disposed on a building structure. In this embodiment, the non-yield section of the coupling beam 5 joint beam is used. 4 for the replacement part of the coupling beam as an example of the application of the building structure, it comprises two annular dampers with the inner and outer shaft sleeves, the two annular dampers are large and small, and the smaller inner ring damper 2 is placed Inside the larger outer ring damper 1, there is a connecting pad 3 between the flat portions on the left and right sides of the two annular dampers, and the two annular dampers are directly embedded with the connecting beams (ie, non- The yielding section 4) is connected.

Specifically, as shown in FIG. 2 to FIG. 4, each of the annular dampers includes an arc segment at both ends and an intermediate segment connected between the arc segments at both ends, and the intermediate segment is provided with an enlarged connecting plate. 99. The connecting pad 3 is sandwiched between two adjacent ones of the enlarged connecting plates 99 connected to the inner and outer two annular dampers. Each of the enlarged connecting plates 99 is provided with a plurality of screw holes 98, and the enlarged connecting plate 99 is connected with the connecting pad 3 bolts 7 through which the multi-level shock grading yielding metal damper passes 3 is coupled to the non-yield section 4 of the coupling beam with a high-strength bolt, and the non-yield section 4 is pre-buried in the joint shear wall 5.

Preferably, the annular damper is cut from a single metal plate or a plurality of metal plates are welded and spliced together. The connecting position of the curved segment and the intermediate segment is smoothly transitioned to prevent stress concentration. The two annular dampers are made of Q235 steel or low yield point steel, and the inner and outer two annular dampers are made of the same material or different materials, and the inner and outer two annular dampers are respectively different in seismic resistance level. Have different yield displacements.

The maximum lateral deformation amount of the inner and outer annular dampers at the design displacement is calculated by finite element simulation, and the thickness of the connection pad 3 is greater than the maximum lateral deformation amount. Among them, the design displacement refers to the maximum relative displacement of the damper determined during design at the time of strong earthquake. The yield displacement refers to the corresponding displacement of the inner and outer rings of the damper when they start to enter the yield state. In the design process of the damper, according to the different target displacement requirements of the structure under different waterproof quasi-earthquakes, the relative displacement of the damper under different waterproofing standards is calculated from the target displacement requirements of the structure, and then determined by finite element simulation and experiment. Size of the ring and outer ring damper.

When practically applied, the multi-level shock grading yielding metal damper can be applied to a variety of building structural environments, for example, between the joint shear walls 5. Specifically, there is a floor panel 6 between the joint shear walls 5 or above the coupling beam. The design displacement is less than a vertical clear distance between the multi-level damping graded yield metal damper and the floor slab 6. The non-yield section 4 of the coupling beam is preferably designed as a variable-section beam, and the end-sectional dimension of the variable-section beam is similar to the central dimension of the outer ring.

The multi-level damping graded yield metal damper may also be supported between the layers of the frame structure to grade the yield energy, and the metal damper may be supported on the frame structure through the support or the wall. (not shown)

When bending deformation, the small inner ring damper 2 yields energy during small earthquakes or medium earthquakes, and the outer outer annular damper 1 is elastic at the outer side. In the case of large earthquakes, the inner and outer annular dampers yield together. Energy consumption.

During construction, as shown in Fig. 8, the multi-level shock grading yielding metal damper can be pre-assembled, and the metal damper connecting pad 3 passes through the high-strength bolt and the embedded part in the coupling beam (ie, the non-yield section 4). connection.

The ABAQUS numerical simulation was carried out on this example. Referring to Figure 5, it can be found that under the action of the medium magnitude, the inner ring damper 2 enters the plastic energy consumption, and the outer ring damper 1 is in the elastic state; see Fig. 6, it can be found in Under the action of large earthquakes, the two annular dampers enter the plastic energy consumption together; Figure 7 is a hysteresis curve of the present invention, from which it can be found that the skeleton curve of the present invention exhibits a typical trilinear characteristic, that is, initial stage elasticity, and then The inner ring damper 2 yields, and finally the outer ring damper 1 yields, indicating that the present invention fully meets the design expectations and can simultaneously meet the graded yield requirements of the medium and large earthquakes.

Embodiment 2 (not shown):

On the basis of the first embodiment, the present invention further provides a multi-level shock grading yielding metal damper, which is different from the first embodiment in that, in this embodiment, there are three outer annular dampers, and Adjacent ring dampers are still connected by connecting pads. Furthermore, in the implementation of the application, the annular damper in the inner ring yields energy during small earthquakes (ie, the middle and outer rings remain elastic during small earthquakes), and the ring damper in the middle ring yields energy at the medium magnitude (ie, medium During the earthquake, both the inner ring and the middle ring yield energy, and the outer ring maintains elasticity. The outer ring ring damper yields energy in the event of a large earthquake (that is, the inner ring, the middle ring and the outer ring both yield energy during a large earthquake). The other structures are basically the same as those in the first embodiment, and will not be further described.

After the above implementation process is completed, the following characteristics of the present invention should be reflected:

The invention can be used in the joint shear wall or the frame structure, can realize the function of the graded yield energy consumption under the different seismic protection, and protect the safety of the main structure, and the invention is easy to repair and replace after the damage.

The above description of the embodiments is provided to enable those skilled in the art to understand and apply the present invention. It will be apparent to those skilled in the art that various modifications can be readily made to these embodiments and the general principles described herein can be applied to other embodiments without the inventive work. Therefore, the present invention is not limited to the embodiments described above, and those skilled in the art should be able to make modifications and changes within the scope of the invention without departing from the scope of the invention.

Claims

A multi-level shock grading yielding metal damper, characterized in that: the multi-level grading and yielding metal damper comprises at least two annular dampers provided in a coaxial inner casing, and two adjacent annular dampers There are spaces between and connected by a connection pad, two of which are used for connection with the building structure; when the bending is deformed, the ring damper relative to the inner ring is more than the ring damping relative to the outer ring The device gives priority.
A multi-level shock grading yielding metal damper according to claim 1, wherein each of said annular dampers includes an arcuate section at both ends and an intermediate section connected between said arcuate sections at both ends, The intermediate section is provided with an enlarged connecting plate, and the connecting pad is sandwiched between two adjacent ones of the enlarged connecting plates of the inner and outer annular dampers.
The multi-level grading and yielding metal damper according to claim 2, wherein each of the enlarged connecting plates is provided with a screw hole, and the enlarged connecting plate is bolted to the connecting plate.
The multi-level shock grading yielding metal damper according to claim 3, wherein said annular damper is made of a metal material, including low yield point steel or Q235 steel, and said inner and outer annular dampers are Made of the same material or different materials, the inner and outer two annular dampers have different yield displacements.
The multi-level grading and yielding metal damper according to claim 4, wherein the maximum lateral deformation amount of the inner and outer annular dampers in design displacement is separately calculated by finite element simulation, and the connecting pad The thickness of the plate is greater than the maximum amount of lateral deformation.
The multi-level grading and yielding metal damper according to claim 1 or 5, wherein the number of the annular dampers is three, and adjacent ones of the annular dampers are connected by a connection pad. For each of the three different magnitudes to yield energy.
The multi-level shock grading yielding metal damper according to claim 2, wherein the arc-shaped section and the intermediate section are smoothly connected to each other to prevent stress concentration.
The multi-level shock grading yielding metal damper according to claim 1, wherein the multi-level grading yielding metal damper is disposed at a coupling beam of the joint shear wall and is connected to the joint by a high-strength bolt. The non-yield section of the coupling beam.
The multi-level shock grading yielding metal damper according to claim 1, wherein the multi-level grading yielding metal damper is supported between layers of the frame structure to classify yield energy.
The multi-level shock grading yielding metal damper according to claim 1, wherein the annular damper is formed by cutting a single metal plate or welding and splicing a plurality of metal plates.