WO2019137012A1

WO2019137012A1 - Damper enabling structure to be self-centering

Info

Publication number: WO2019137012A1
Application number: PCT/CN2018/102179
Authority: WO
Inventors: 郭彤; 朱瑞召
Original assignee: 东南大学
Priority date: 2018-01-15
Filing date: 2018-08-24
Publication date: 2019-07-18
Also published as: CN108222307A

Abstract

Disclosed is a damper enabling a structure to be self-centering. The damper comprises an oil cylinder (1), an outer cylinder (2), an inner oil cylinder cap (3) and an outer oil cylinder cap (7) respectively provided at two ends of the oil cylinder (1), a piston rod (5) passing through the oil cylinder (1), and a piston (4) provided on the piston rod (5), wherein one end of the oil cylinder (1) provided with the inner oil cylinder cap (3) is embedded at one end of the outer cylinder (2), and the other end of the outer cylinder (2) is provided with an outer cylinder cap (14); one end of the piston rod (5) is provided with a piston rod nut (11) embedded in the outer cylinder (2), a first limiting plate (9) and a second limiting plate (12) separately provided at two sides of the piston rod nut (11), a first limiting pin (10) mounted on the first limiting plate (9), and a second limiting pin (15) mounted on the second limiting plate (12); a first spring unit (8) is provided between the inner oil cylinder cap (3) and the first limiting plate (9), and a second spring unit (13) is provided between the outer cylinder cap (14) and the second limiting plate (12); and the outer cylinder (2) is provided with a groove (16), and the first limiting pin (10) and the second limiting pin (15) are both embedded in the groove (16) and can move axially therein along the outer cylinder (2). The damper has a good energy dissipation capability, and can enable a structure to fully and automatically reset.

Description

A damper that enables the structure to be self-centering

Technical field

The invention belongs to the technical field of building and bridge structure protection, and is a damper which can realize automatic resetting of the structure.

Background technique

China is a country with frequent earthquakes. The earthquake has caused great losses to the lives and property of the people. Especially in the 2008 Wenchuan earthquake, the losses were even more serious. Therefore, people's awareness of earthquake prevention and disaster prevention after the earthquake was greatly enhanced. When building houses, some buildings added liquid viscous dampers to achieve energy dissipation. However, at this stage, when the structural design is carried out in accordance with the requirements of China's seismic code, the structure should meet the fortification goal of “the small earthquake is not bad, the medium earthquake can be repaired, and the large earthquake does not fall”, that is, the structure is allowed to appear larger under the rare earthquake. Shape deformation to dissipate energy. Even if a liquid viscous damper is added to the structure to improve its energy consuming capacity, the structure still has residual deformation after the earthquake. This part of the residual deformation will seriously affect the use of the structure, such as the difficulty and cost of repairing. Therefore, people have studied how the structure can achieve automatic reset.

The existing liquid viscoelastic damper is provided with a pair of spring units on the basis of the liquid viscous damper, so that it has a certain resetting ability, but it cannot achieve complete reset. Because, when the damper is in the equilibrium position, regardless of whether the spring applies a preload, the forces of the pair of springs are balanced with each other, and the resultant force is zero. The damper itself has the frictional force, plus the force required for the structural reset. When the damper is not in the equilibrium position, it cannot completely return to the initial equilibrium position, that is, the complete reset of the structure cannot be achieved.

Summary of the invention

Technical Problem: The present invention proposes a damper that dissipates seismic energy and is used for energy dissipation of structures such as buildings and bridges to achieve self-centering of the structure.

Technical Solution: The damper for self-centering of the structure of the present invention comprises a cylinder, an outer cylinder, an inner cylinder cover and an outer cylinder cover respectively disposed at two ends of the cylinder, a piston rod penetrating through the cylinder, and being disposed in the cylinder a piston on the piston rod, one end of the cylinder provided with an inner cylinder cover is inserted into one end of the outer cylinder, and the other end of the outer cylinder is provided with an outer cylinder cover, and one end of the piston rod is provided with a piston rod nut embedded in the outer cylinder, and is disposed in the a first limiting plate and a second limiting plate on both sides of the piston rod nut, a first limiting pin mounted on the first limiting plate, and a second limit mounted on the second limiting plate a first spring unit is disposed between the inner cylinder head and the first limiting plate, and a second spring unit is disposed between the outer cylinder cover and the second limiting plate, and the outer cylinder is provided with a groove, the first limit Both the position pin and the second limit pin are embedded in the groove and are axially movable therein along the outer cylinder.

Further, in the damper of the present invention, the cylinder is filled with silicone oil.

Further, in the damper of the present invention, both the first spring unit and the second spring unit are applied with a pre-pressure.

Further, in the damper of the present invention, the pre-pressure applied on the first spring unit and the second spring unit is equal to the sum of the friction force of the damper and the restoring force to be applied to the external structure.

Further, in the damper of the present invention, the length of the groove is equal to the sum of the stroke of the damper and the thickness of the first limit pin, and the width is equal to the width of the first limit pin plus the gap required for free movement in the groove. .

Further, in the damper of the present invention, the number of the slots is four, and the two pairs are correspondingly arranged.

Further, in the damper of the present invention, the inner diameter of the first limiting plate is the diameter of the piston rod plus the clearance required for the free movement of the piston rod, and the outer diameter is the inner diameter of the outer cylinder minus the clearance required for the free movement of the first limiting plate. The outer diameter of the second limiting plate is the inner diameter of the outer cylinder minus the clearance required for the second limiting plate to freely move.

Further, in the damper of the present invention, the outer diameter of the piston rod nut is such that it can freely move in the outer cylinder.

Further, in the damper of the present invention, the first spring unit and the second spring unit are composite springs or disc springs.

In the present invention, the cross-sectional dimensions of the cylinder, the outer cylinder and the piston rod are such as to satisfy the requirement that buckling deformation does not occur during use. The length of the wall between the adjacent two grooves satisfies at least the requirement of applying a preload to the spring unit without buckling deformation.

Further, in the present invention, the thickness of the first limiting plate satisfies the requirement of applying a pre-pressure to the first spring unit without buckling deformation; the thickness of the second limiting plate satisfies the application of the pre-pressure to the second spring unit. The requirement of buckling deformation does not occur; the cross sections of the first limit pin and the second limit pin respectively satisfy the requirements of applying preload to the first spring unit and the second spring unit without buckling deformation;

Further, in the present invention, the outer diameter of the piston rod nut is such that it can freely move in the outer cylinder, and the thickness should satisfy the requirement that no buckling deformation occurs during operation.

The damper of the invention is equivalent to including both the energy consuming system and the resetting system. The energy consuming system is composed of a cylinder, a silicone oil, a piston, a piston rod, an inner cylinder head and an outer cylinder head, and the reset system is an outer cylinder and a first limit. The bit plate, the second limiting plate, the first limiting pin, the second limiting pin and a spring unit applying a preload.

The invention provides a limiting plate, and the two sets of spring units are independent of each other and can be preloaded separately. When the damper is pulled, one of the sets of springs is further compressed to provide a restoring force. When the damper is pulled, the other set of springs is further pressurized to provide a restoring force. The two sets of springs respectively have a pre-pressure that can overcome the frictional force and the restoring force when in the initial equilibrium position. When the set of springs is further pressed, the restoring force of the spring can satisfy the push of the damper back to the initial equilibrium position. demand. During the earthquake, repeated movements of the piston in the cylinder dissipate seismic energy. The device of the invention can be used for energy dissipation and shock absorption and automatic reset after earthquake.

Advantageous Effects: Compared with the prior art, the present invention has the following advantages:

1. Has good energy consumption. When the structure in which the damper is installed encounters an earthquake, the damper is repeatedly subjected to tension and compression, and the silicone oil quickly passes through the small hole in the piston, thereby converting the vibration energy into heat energy dissipation.

2. The existing liquid viscoelastic damper is provided with a pair of spring units on the basis of the liquid viscous damper, so that it has a certain resetting ability, but it cannot achieve complete reset. Because, when the damper is in the equilibrium position, regardless of whether the spring applies a preload, the forces of the pair of springs are balanced with each other, and the resultant force is zero. The damper itself has the frictional force, plus the force required for the structural reset. When the damper is not in the equilibrium position, it cannot completely return to the initial equilibrium position, that is, the complete reset of the structure cannot be achieved. However, after the damper of the present invention is respectively provided with the limiting plate, the two sets of spring units are independent of each other, and when the damper is in the initial state, the two sets of spring units are respectively applied with pre-stresses which can overcome the frictional force and the structural reset. A fully automatic reset of the structure is thus achieved. When the residual deformation is about to occur in the structure after the earthquake, when the damper is pulled, the spring on the left side of the damper is still in the initial equilibrium position due to the existence of the limit plate, and the spring on the right side acts on the piston rod nut and the limit plate. Further pressure. When the spring is in the initial equilibrium position, a pre-pressure that overcomes the frictional force and the restoring force is applied. When the spring is further pressed, the spring's rebounding force pushes the damper back to the initial equilibrium position, and the structure is automatically reset. When the damper is pressed, the left spring of the damper is pressed, the right spring does not move, and the left pressure spring pushes the damper to automatically reset.

DRAWINGS

Figure 1- Schematic diagram of the damper;

Figure 2 (a) is a longitudinal section of the outer cylinder, Figure 2 (b) is a sectional view of 1-1;

Figure 3 - sectional view of the first limiting plate and the limit pin;

Figure 4 - Sectional view of the second limit plate and the limit pin;

Figure 5 - Schematic diagram of the damper balance state;

Figure 6 - Schematic diagram of the damper tension state;

Figure 7 - Schematic diagram of the damper pressure state.

The figures in the figure indicate: 1-cylinder, 2-outer cylinder, 3-inner cylinder head, 4-piston, 5-piston rod, 6-silicone oil, 7-outer cylinder head, 8-first spring unit, 9-first Limit plate, 10-first limit pin, 11-piston rod nut, 12-second limit plate, 13-second spring unit, 14-outer tube cover, 15-second limit pin, 16-slot .

Detailed ways

The invention will now be further described in conjunction with the embodiments and the drawings.

The damper proposed by the invention can realize self-centering of the structure, and the specific implementation process is as follows:

(1) The inner cylinder head 3 is installed at one end of the cylinder 1, and the piston 4 and the piston rod 5 are assembled into the cylinder 1, and one end of the piston rod 5 passes through the inner cylinder cover 3, and the piston 4 is located in the cylinder 1. Then, the silicone oil 6 is injected into the cylinder 1, and after the filling is completed, the outer cylinder cover 7 is attached to the other end of the cylinder 1, and the other end of the piston rod 5 passes through the outer cylinder cover 7.

(2) One end of the cylinder 1 on which the inner cylinder cover 3 is placed is fitted into one end of the outer cylinder 2.

(3) Inserting the first spring unit 8 into the outer cylinder 2 through the piston rod 5, and placing the first limiting plate 9 in the outer cylinder 2 next to the first spring unit 8, the first spring unit 8 being a composite spring Or a disc spring.

(4) Preloading the first limiting plate 9 and the first spring unit 8 to the specified pre-pressure, and then inserting the first limiting pin 10 through the slot 16 of the outer cylinder 2 into the first limiting plate 9. The pre-pressure is equal to the sum of the friction of the damper and the restoring force to be applied to the external structure. A groove 16 has been previously opened in the outer cylinder 2, and the first limit pin 10 is fitted into the groove 16 and is freely movable therein along the axial direction of the outer cylinder 2. The length of the groove 16 is equal to the sum of the stroke of the damper and the thickness of the first limit pin 10, and after the first spring unit 8 is pre-compressed to the specified pre-pressure, the first limit pin 10 is inserted into the first limiting plate 9, The first limit pin 10 is also located just at the edge of the slot 16.

(5) Next to the first limiting plate 9, a piston rod nut 11 embedded in the outer cylinder is disposed at one end of the piston rod 5

(6) Next to the piston rod nut 11, the second limiting plate 12 is placed in the outer cylinder 2, and then the second limiting pin 15 is inserted into the second limiting plate 12 through the slot 16 of the outer cylinder 2, second The limit pin 12 is fitted into the groove 16 and is free to move axially there along the outer cylinder 2.

(7) Next to the second limiting plate 12, the second spring unit 13 is placed in the outer cylinder 2, and the second spring unit 13 is pre-compressed to a specified pre-pressure, the pre-pressure is equal to the friction of the damper and needs to be external The sum of the restoring forces applied by the structure.

(8) An outer cylinder cover 14 is provided at the other end of the outer cylinder 2.

When the structure in which the damper is installed encounters an earthquake, the damper is repeatedly subjected to tension and compression, and the silicone oil 6 quickly passes through the small hole in the piston 4, thereby converting the vibration energy into heat energy dissipation. When the residual deformation is about to occur in the structure after the earthquake, when the damper is pulled, the second spring unit 13 on the left side of the damper is still in the initial equilibrium position due to the presence of the limiting

plates

9, 12, and the first spring unit on the right side 8 is further pressed by the piston rod nut 11 and the first limiting plate 9. While the first spring unit 8 has applied a pre-pressure against the frictional force and the restoring force when in the initial equilibrium position, the rebound force of the first spring unit 8 pushes the damper back when the first spring unit 8 is further pressed. At the initial equilibrium position, the structure is automatically reset. When the damper is pressed, the second spring unit 13 on the left side of the damper is pressed, the first spring unit 8 on the right side is not moved, and the second spring unit 13 pressed on the left side pushes the damper to automatically reset.

The above-described embodiments are merely preferred embodiments of the present invention, and it should be noted that those skilled in the art can make several improvements and equivalents without departing from the principles of the present invention. The technical solutions required for improvement and equivalent replacement are all within the scope of the present invention.

Claims

A damper capable of self-centering a structure, characterized in that the damper comprises a cylinder (1), an outer cylinder (2), an inner cylinder cover (3) respectively disposed at two ends of the cylinder (1), and An outer cylinder head (7), a piston rod (5) penetrating the cylinder (1), a piston (4) disposed on the piston rod (5) in the cylinder (1), and an inner cylinder cover disposed on the cylinder (1) One end of (3) is embedded in one end of the outer cylinder (2), the other end of the outer cylinder (2) is provided with an outer cylinder cover (14), and one end of the piston rod (5) is provided with a piston rod nut embedded in the outer cylinder (2) (11) a first limiting plate (9) and a second limiting plate (12) disposed on opposite sides of the piston rod nut (11), and a first mounting on the first limiting plate (9) a limit pin (10), a second limit pin (15) mounted on the second limit plate (12), and a first between the inner cylinder cover (3) and the first limit plate (9) a spring unit (8), a second spring unit (13) disposed between the outer cylinder cover (14) and the second limiting plate (12), and the outer cylinder (2) is provided with a groove (16), the first A limit pin (10) and a second limit pin (15) are both embedded in the groove (16) and are axially movable therein along the outer cylinder (3).
A damper for self-centering a structure according to claim 1, characterized in that the cylinder (1) is filled with silicone oil (6).
A damper for self-centering a structure according to claim 1, characterized in that both the first spring unit (8) and the second spring unit (13) are applied with a pre-pressure.
A damper for self-centering a structure according to claim 3, wherein a preload applied to said first spring unit (8) and said second spring unit (13) is equal to said damper The frictional force and the sum of the restoring forces that need to be applied to the external structure.
A damper for self-centering a structure according to claim 1, wherein the length of the groove (16) is equal to the sum of the stroke of the damper and the thickness of the first limit pin (10), The width is equal to the width of the first limit pin (10) plus the clearance required to be free to move in the slot (16).
A damper for self-centering a structure according to claim 1, 2, 3, 4 or 5, characterized in that the number of the grooves (16) is four, and the two pairs are correspondingly arranged.
A damper for self-centering a structure according to claim 1, 2, 3, 4 or 5, characterized in that the inner diameter of the first limiting plate (9) is a piston rod (5) The diameter plus the clearance required for the free movement of the piston rod, the outer diameter is the inner diameter of the outer cylinder (2) minus the clearance required for the free movement of the first limiting plate (9); the outer diameter of the second limiting plate (12) is The inner diameter of the outer cylinder (2) minus the clearance required for the second limiting plate (12) to freely move.
A damper for self-centering a structure according to claim 1, 2, 3, 4 or 5, characterized in that the outer diameter of the piston rod nut (11) is such that it can be in the outer cylinder (2) ) Free activity.
A damper for self-centering a structure according to claim 1, 2, 3, 4 or 5, characterized in that said first spring unit (8) and second spring unit (13) are Composite spring or disc spring.