JP2000291288A - Damper for brace - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress the shaking of a structure caused by a horizontal force due to a small earthquake, a wind or others. SOLUTION: This damper 1 for a brace is interposed between a frame main body 2 and a brace 3 disposed within the plane of this body and it is constituted generally out of a vertical damper part 4 and a pair of horizontal damper parts 5 disposed at opposite positions with the damper part 4 between. The vertical damper part 4 is constituted by holding a Vertical load supporting spring 7, a nonlinear spring, in a casing 6 for a vertical spring, which is fitted to the lower end of the brace 3, and by fitting a spring-side slide plate 8 to the base of the spring 7, and the spring-side slide plate 8 is so constituted as to be slidable mutually with a frame-side slide plate 9 fitted to the frame main body 2. Each horizontal damper part 5 is constituted by fitting a first tube material 12 fixed to the frame main body 2 through the intermediary of a reaction projection 11 in a second tube material 13 slidable on the outer surface of the casing 6 for the vertical spring and by disposing a horizontal load supporting spring 15, the nonlinear spring, in an internal airtight space enclosed with these tube materials.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brace damper interposed between a frame body made of steel or the like and a brace disposed in the plane of the frame body.

[0002]

2. Description of the Related Art A steel frame is sometimes used as an earthquake-resistant wall for the purpose of constructing a structure having excellent earthquake resistance or reinforcing an existing structure by earthquake resistance. There are also increasing cases where an elastic-plastic damper is interposed between the brace and the frame body.

[0003] In such a steel frame, the elasto-plastic damper is formed of, for example, a steel plate having a large number of slits or a mild steel plate. Is transmitted to the elasto-plastic damper as forced shear deformation, and the elasto-plastic damper subjected to the forced shear deformation exhibits an elasto-plastic behavior of shear deformation while drawing a hysteresis loop. Then, the horizontal force during the earthquake is absorbed by the elasto-plastic damper in the form of hysteresis, and the horizontal vibration of the structure quickly converges.

[0004]

However, such an elasto-plastic damper exhibits an elasto-plastic behavior while forming a hysteresis loop only when a horizontal force exceeding the yield point acts on the elasto-plastic damper. For horizontal loads below the yield point, the elasto-plastic damper only behaves in the elastic region, and does not exhibit its energy absorbing ability due to hysteresis damping.

Therefore, even if a horizontal force due to a relatively small earthquake, wind, or the like acts on the structure, there has been a problem that the sway of the structure caused by the horizontal force cannot be suppressed by the elasto-plastic damper.

The present invention has been made in view of the above-mentioned circumstances, and provides a brace damper capable of suppressing a swing of a structure caused by a horizontal force due to a relatively small earthquake or wind. With the goal.

[0007]

In order to achieve the above object, a brace damper according to the present invention is provided in a frame main body made of a steel frame or the like and in the plane thereof. A brace damper interposed between the brace and a vertical load supporting spring housed in a vertical spring casing attached to an end of the brace and attached to the bottom of the vertical load supporting spring. A vertical damper portion configured such that the spring-side sliding plate and the frame-side sliding plate attached to the opposing surface of the frame main body are slidable with each other, and are disposed at opposing positions sandwiching the vertical damper portion. A pair of horizontal damper portions, the horizontal damper portion being provided between a frame-side member fixed to the frame main body and an outer surface of the vertical spring casing and a sliding-side member slidable for horizontal load support. Spring Arranged and configured, the vertical load supporting spring and the horizontal load supporting spring, in which stiffness is constituted by a non-linear spring that increases with increasing load.

Further, the brace damper according to the present invention comprises:
The vertical load supporting spring and the horizontal load supporting spring are each formed of a conical helical spring formed by winding a flat plate, and an outer periphery of a portion that rotates an inner peripheral surface of the flat plate inside the inner peripheral surface. It is configured to contact the surface.

Further, the brace damper according to the present invention comprises:
The frame-side member is formed of a first cylindrical member, and the sliding-side member is formed of a second cylindrical member. The first cylindrical member and the second cylindrical member are fitted to each other in a nested manner. The horizontal load supporting spring is arranged in the internal airtight space surrounded by the above, and at least one of the first cylindrical material and the second cylindrical material is provided with a damping air hole communicating with the internal airtight space. It was made.

[0010] The brace damper according to the present invention comprises:
The vertical spring casing is attached to an end of the brace via an elastic-plastic damper.

In the brace damper according to the present invention, when the horizontal force acts on the structure and the entire frame undergoes shear deformation, in the horizontal damper portion, the frame-side member and the sliding-side member include the frame body and the vertical spring. The horizontal movement is restrained by the casing. Therefore, a relative displacement in the horizontal direction occurs between the frame-side member and the sliding-side member, and as a result, the relative displacement is forcedly deformed in the horizontal load supporting spring disposed therebetween. A predetermined horizontal force acts. Here, the horizontal load supporting spring is constituted by a non-linear spring whose rigidity increases as the load increases, so that when the horizontal force due to the forced deformation is small, the rigidity is also small, and therefore, the horizontal force acting on the structure is reduced. Even if the force is due to a relatively small earthquake or wind, a relatively large shear deformation occurs in the frame body. On the other hand, when the horizontal force due to the forced deformation increases, the rigidity also increases. Therefore, when the horizontal force acting on the structure is due to a large earthquake, excessive shear deformation of the frame body is suppressed.

Next, in the vertical damper portion, when a horizontal force acts on the structure and the entire frame is sheared, the spring-side sliding plate attached to the bottom portion of the vertical load supporting spring has an opposing surface of the frame body. Slides on the frame-side sliding plate attached to the. At this time, even if the horizontal force acting on the structure is due to a relatively small earthquake, wind, or the like, the frame body undergoes relatively large shear deformation due to the action of the above-described horizontal damper portion. And the frame side sliding plate relatively slide with a sufficient stroke. The horizontal vibration energy of the structure is absorbed in the form of frictional damping due to the sliding action, and the vibration of the structure quickly converges. Since the vertical spring casing of the vertical damper is slidable with respect to the sliding member of the horizontal damper, the vertical forced displacement accompanying shear deformation of the frame body acts on the horizontal damper. Therefore, there is no possibility of damaging the horizontal damper.

[0013] Here, the frame body also undergoes a vertical displacement due to the shearing deformation, and the displacement becomes a forced deformation, and a vertical force acts on the vertical load supporting spring housed in the vertical spring casing. However, such a vertical load supporting spring is composed of a non-linear spring whose stiffness increases as the load increases. Therefore, when the vertical force is small, the stiffness is also small. Therefore, the horizontal force acting on the structure can be compared. In the case of an extremely small earthquake, wind, or the like, it does not prevent the frame main body from undergoing relatively large shear deformation. on the other hand,
When the vertical force increases, the rigidity also increases. Therefore, when the horizontal force acting on the structure is due to a large earthquake, excessive shear deformation of the frame body is suppressed.

The vertical load supporting spring and the horizontal load supporting spring may have any configuration as long as they are non-linear springs whose rigidity increases as the load increases. If the supporting spring is constituted by a conical helical spring formed by winding a flat plate, and the inner peripheral surface of the flat plate is made to abut on the outer peripheral surface of a portion orbiting inside the inner peripheral surface. When the vertical load supporting spring or the horizontal load supporting spring is deformed, the inner peripheral surface and the outer peripheral surface rub against each other, so that the vibration energy of the structure is also absorbed as frictional attenuation due to the rubbing.

On the other hand, how the frame side member and the sliding side member of the horizontal damper portion are arbitrarily configured, the frame side member is formed of the first cylindrical member and the sliding side member is formed of the first cylindrical member. A horizontal load supporting spring disposed in an internal airtight space surrounded by the first and second cylindrical members, and If at least one of the cylindrical member and the second cylindrical member is provided with a damping air hole communicating with the internal airtight space, external air is supplied to the first cylindrical member through the damping air hole. Then, the air flows into the internal hermetic space surrounded by the second cylindrical member and the air in the internal hermetic space flows out through the damping air holes. Therefore, the vibration energy of the structure is also absorbed as damping in the damping air holes.

The casing for the vertical spring may be directly attached to the end of the brace, but if it is attached to the end of the brace via an elastic-plastic damper,
Since the elasto-plastic damper absorbs a large deformation of the frame body during a large earthquake, it is possible to prevent the horizontal damper from being damaged.

[0017]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a brace damper according to an embodiment of the present invention. It is to be noted that the same reference numerals are given to components and the like that are substantially the same as those in the conventional technology, and description thereof will be omitted.

FIG. 1 shows a brace damper according to this embodiment. The brace damper 1 according to the present embodiment is interposed between a frame main body 2 made of a steel frame and a Y-shaped brace 3 disposed in the plane thereof, as can be seen from FIG. As can be seen from FIG. 2B, the vertical damper portion 4 and a pair of horizontal damper portions 5 and 5 arranged at opposing positions sandwiching the vertical damper portion are generally constituted.

The vertical damper part 4 accommodates a vertical load supporting spring 7 in a vertical spring casing 6 attached to the lower end of the brace 3 as shown in the detailed view of FIG. A spring-side sliding plate 8 is attached to the bottom of the spring, and the spring-side sliding plate is slidable with respect to a frame-side sliding plate 9 attached to the opposite surface of the frame main body 2. It is configured in.

The spring side sliding plate 8 is, for example, a stainless steel plate.
The frame side sliding plate 9 can be formed of, for example, an ultra-high molecular weight polyethylene plate, and the vertical spring casing 6 is configured by turning a hollow cylindrical member with a bottom upside down as shown in FIG. Can be.

The vertical load supporting spring 7 is a conical helical spring formed by winding a flat plate, and is configured as a non-linear spring whose rigidity increases as the vertical load increases.

The rigidity of the vertical load supporting spring 7 may be given a non-linear characteristic by considering the width of the flat plate w, the size of the target earthquake or wind, the vibration characteristics of the structure, and the like.
The thickness, the maximum diameter and the minimum diameter, the number of turns, and the like may be set as appropriate. It is not necessary to make the width and thickness of the flat plate uniform,
When it is desired to set particularly high rigidity in the region where the vertical force is large, the thickness and width of the flat plate near the top of the cone are increased, or when it is desired to set particularly low rigidity in the region where the vertical force is small, the vicinity of the cone bottom is set. It is also possible to adopt a configuration in which the thickness and width of the flat plate are reduced.

Here, the vertical load supporting spring 7 has the inner peripheral surface of the flat plate abutted on the outer peripheral surface of a portion orbiting inside the inner peripheral surface. When the load supporting spring 7 expands and contracts, friction occurs due to friction between the inner peripheral surface and the outer peripheral surface. Incidentally, if the inner and outer surfaces of the flat plate are appropriately coated with a friction material, it is possible to ensure high frictional attenuation.

As shown in FIG. 3, the horizontal damper portion 5 slides on the first cylindrical member 12 as a frame side member fixed to the frame main body 2 via the reaction force projection 11 and the outer surface of the vertical spring casing 6. Second cylindrical member 1 as a movable sliding member
3 are nested with each other, a horizontal load supporting spring 15 is disposed in an internal hermetic space 14 surrounded by them, and damping air communicates with the second cylindrical member 13 to the internal hermetic space 14. A hole 16 is provided.

Although the outer diameter of the first cylindrical member 12 is set to be equal to or slightly smaller than the inner diameter of the second cylindrical member 13, the outer peripheral surface slides on the inner peripheral surface of the second cylindrical member 13. If the moving annular seal member is provided, it is easy to secure airtightness with the second cylindrical member 13 during the reciprocating operation, that is, the operation of moving in and out of the second cylindrical member 13.

On the other hand, the horizontal load supporting spring 15, like the vertical load supporting spring 7, is a conical helical spring formed by winding a flat plate, and is constituted as a non-linear spring whose rigidity increases as the horizontal load increases. When the horizontal load supporting spring 15 expands and contracts with the shear deformation of the frame body 2, the inner peripheral surface of the flat plate is brought into contact with the outer peripheral surface of a portion orbiting inside the inner peripheral surface. Friction is generated by friction between the inner peripheral surface and the outer peripheral surface. Incidentally, if the inner and outer surfaces of the flat plate are appropriately coated with a friction material, it is possible to ensure high frictional attenuation.

In the brace damper 1 according to the present embodiment, when a horizontal force acts on a structure, the frame body 2
As shown in FIG. 4 (a), the whole undergoes shear deformation, and a horizontal displacement Δh and a vertical displacement Δv occur at the top.

On the other hand, in the horizontal damper portion 5, the first cylindrical member 12 as the frame side member and the second cylindrical member 13 as the sliding side member are horizontally moved by the frame body 2 and the vertical spring casing 6, respectively. Movement is restricted.

Therefore, the first cylindrical member 12 and the second cylindrical member 1
3, a horizontal relative displacement Δh ′ is generated as shown in FIG. 3B, and as a result, the horizontal load supporting spring 15 disposed between the two is forced by the relative displacement. A predetermined horizontal force acts as deformation.

Here, since the horizontal load supporting spring 15 is formed as a conical spiral spring formed by winding a flat plate, a portion having a large spiral diameter has the lowest rigidity, and the spiral diameter decreases toward the side. And the rigidity increases accordingly.

Therefore, in a region where the horizontal load is small, as shown in FIG. 5 (a), a portion having a small rigidity (the left side in FIG. 5) contracts in advance, and as the horizontal load increases, the contraction region gradually becomes lateral. In a region where the horizontal load is large, the rigidity is high as shown in FIG. FIG.
(c) shows the relationship between the horizontal load and the displacement of the horizontal load supporting spring 15 as a P-δ curve, and points A and B shown in FIG. ).

As described above, the horizontal load supporting spring 15 has a small rigidity when the horizontal force due to the forced deformation is small, that is, when the horizontal force acting on the structure is due to a small earthquake or wind. When relatively large shear deformation occurs in the frame main body 2 and horizontal force due to forced deformation is large, that is, when the horizontal force acting on the structure is due to a large earthquake, the rigidity increases. Excessive shear deformation is suppressed.

Next, in the vertical damper portion 4, when a horizontal force acts on the structure and the frame main body 2 is sheared, the spring-side sliding plate 8 attached to the bottom of the vertical load supporting spring 7 moves the frame. It slides on the frame-side sliding plate 9 attached to the facing surface of the main body 2. At this time, even if the horizontal force acting on the structure is due to a small earthquake, wind, or the like, the action of the horizontal damper portion 5 described above causes the frame body 2 to move.
Is relatively largely sheared, the spring side sliding plate 8 and the frame side sliding plate 9 slide with each other with a sufficient stroke. The horizontal vibration energy of the structure is absorbed in the form of frictional damping due to the sliding action, and the vibration of the structure quickly converges.

On the other hand, the vertical spring casing 6 of the vertical damper portion 4 is configured to be slidable with respect to the second cylindrical member 13 of the horizontal damper portion 5, so that the vertical spring casing 6 undergoes a vertical deformation accompanying the shear deformation of the frame body 2. There is no risk that the relative forced displacement Δv ′ (FIG. 4) in the direction acts on the horizontal damper 5 to damage the horizontal damper.

When the frame body 2 undergoes shear deformation, the horizontal load supporting spring 15 expands and contracts due to the horizontal force caused by the horizontal forced displacement Δh ′, and the vertical forced displacement Δv ′.
The vertical load supporting spring 7 expands and contracts due to the vertical force caused by the above, and at this time, the inner peripheral surface and the outer peripheral surface of the horizontal load supporting spring 15 and the vertical load supporting spring 7 rub against each other, so that frictional attenuation occurs. In the horizontal damper section 5, the damping air holes 1 are provided.
6 allows the external air to flow through the first cylindrical member 12 and the second cylindrical member 1.
3 flows into the internal hermetic space 14 enclosed by 3 and conversely, the air in the internal hermetic space flows out through the damping air hole 16 to form an air damper. Is attenuated.

As described above, according to the brace damper 1 according to the present embodiment, the horizontal load supporting spring 15 of the horizontal damper portion 5 is constituted by a non-linear spring whose rigidity increases as the load increases. Therefore, even if the horizontal force acting on the structure is due to a small earthquake, wind, or the like, a relatively large shear deformation occurs in the frame body 2, and the spring-side slide attached to the bottom of the vertical load supporting spring 7. The moving plate 8 slides on a frame-side sliding plate 9 attached to the frame main body 2 with a sufficient stroke.

Therefore, it is possible to absorb the horizontal vibration energy of the structure in the form of frictional damping due to the sliding action, and to quickly converge the vibration of the structure. On the other hand, when the horizontal force acting on the structure is due to a large earthquake, excessive shear deformation of the frame body 2 can be suppressed by the above-described operation of the horizontal load supporting spring 15 in the high rigidity region. .

Further, according to the brace damper 1 of the present embodiment, the vertical load supporting spring 7 and the horizontal load supporting spring 15 are formed by conical spiral springs formed by winding flat plates. The inner peripheral surface of the inner peripheral surface abuts against the outer peripheral surface of a portion orbiting inside the inner peripheral surface, so that when the vertical load supporting spring 7 or the horizontal load supporting spring 15 is deformed, The surfaces rub against each other, and the vibration energy of the structure can be absorbed as frictional attenuation due to the rubbing.

Further, according to the brace damper 1 according to the present embodiment, the first tubular member 12 and the second tubular member 13 are nested with each other, and the first tubular member and the second tubular member 13 are nested. The horizontal load supporting spring 15 is disposed in the internal airtight space 14 surrounded by the second cylindrical member, and the damping air hole 16 communicating with the internal airtight space 14 is provided in the second cylindrical member. The vibration energy of the object can be absorbed as the attenuation in the attenuation air hole 16.

In this embodiment, the vertical spring casing 6 is used.
Is attached directly to the end of the brace 3, but may be attached to the end of the brace 3 via an elastic-plastic damper 21, as shown in FIG.

According to this configuration, the large deformation of the frame main body 2 at the time of a large earthquake is absorbed by the elasto-plastic damper 21, so that the horizontal damper portion 5 can be prevented from being damaged. In this case, it is needless to say that hysteresis damping, which is an original function of the elasto-plastic damper 21, is exhibited, and the vibration of the structure can be quickly converged.

Although not specifically mentioned in the present embodiment, as shown in FIG. 7, a female screw 31 is formed on the inner surface of the damping air hole 16 and a male screw 33 is formed on the outer peripheral surfaces of the hollow screws 32a and 32b. The male screw 33 which has been formed and
Screws 32a and 32b are screwed into female screws 31.
May be screwed into the damping air hole 16.

According to such a configuration, the hollow screws 32a, 3a
By appropriately adjusting the hollow diameter of 2b, the attenuation of the air damper can be adjusted to a desired size.

[0044]

As described above, according to the brace damper of the first aspect of the present invention, even if the horizontal force acting on the structure is caused by a small earthquake, wind, or the like, the frame main body is not damaged. Relatively large shear deformation occurs, and the spring-side sliding plate attached to the bottom of the vertical load supporting spring and the frame-side sliding plate attached to the frame main body slide with a sufficient stroke. Therefore, the horizontal vibration energy of the structure can be absorbed in the form of frictional damping due to the sliding action, and the vibration of the structure can be quickly converged. On the other hand, when the horizontal force acting on the structure is due to a large earthquake, excessive rigid deformation of the frame main body can be suppressed by the high rigidity of the horizontal load supporting spring.

Further, according to the brace damper of the present invention, when the vertical load supporting spring or the horizontal load supporting spring is deformed, the inner peripheral surface and the outer peripheral surface are rubbed, and the rubbing is performed. As a result, it is possible to absorb the vibration energy of the structure as a frictional damping effect.

According to the brace damper of the third aspect of the present invention, there is also an effect that the vibration energy of the structure can be absorbed as damping in the damping air hole.

According to the brace damper of the present invention, since the elastic-plastic damper absorbs the large deformation of the frame body during a large earthquake, the damage of the horizontal damper portion is prevented beforehand. It also has the effect of being able to do so.

[0048]

[Brief description of the drawings]

FIG. 1 is a view of a brace damper 1 according to the present embodiment, wherein (a) is a layout view and (b) is a front view.

FIGS. 2A and 2B are diagrams of a vertical damper unit 4, in which FIG.
Is a horizontal sectional view along the line AA.

FIG. 3 is a sectional view of a horizontal damper unit 5;

FIG. 4 is a view showing the operation of the brace damper 1 according to the embodiment.

FIG. 5 is a view showing the operation of the brace damper 1 according to the embodiment.

FIG. 6 is a front view showing a brace damper according to a modification.

FIG. 7 is a partial detailed view showing a brace damper according to a modification.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Damper for brace 2 Frame main body 3 Brace 4 Vertical damper part 5 Horizontal damper part 6 Casing for vertical spring 7 Spring for vertical load support 8 Spring side sliding plate 9 Frame side sliding plate 12 Frame side member (first cylindrical member) 13) Sliding side member (second cylindrical member) 14 Internal airtight space 15 Horizontal load supporting spring 16 Damping air hole

Claims (4)

[Claims] 1. A brace damper interposed between a frame main body made of a steel frame or the like and a brace disposed in the plane thereof, wherein a casing for a vertical spring attached to an end of the brace is provided. The vertical load supporting spring is accommodated in the spring, and the spring side sliding plate attached to the bottom of the vertical load supporting spring and the frame side sliding plate attached to the opposite surface of the frame main body are slidable with each other. A vertical damper portion, and a pair of horizontal damper portions disposed at opposing positions sandwiching the vertical damper portion, the horizontal damper portion,
A horizontal load supporting spring is arranged between a frame side member fixed to the frame body and an outer surface of the vertical spring casing and a slidable sliding member, and the vertical load supporting spring and A brace damper characterized in that the horizontal load supporting spring is constituted by a non-linear spring whose rigidity increases as the load increases. 2. The vertical load supporting spring and the horizontal load supporting spring are formed of a conical helical spring formed by winding a flat plate, and the inner peripheral surface of the flat plate is formed inside the inner peripheral surface. 2. The brace damper according to claim 1, wherein the damper is configured to be in contact with an outer peripheral surface of a portion that goes around. 3. The frame-side member is formed of a first cylindrical member, and the sliding-side member is formed of a second cylindrical member. The horizontal load supporting spring is disposed in an internal hermetic space surrounded by a second cylindrical member, and a damping member communicating with the internal hermetic space to at least one of the first cylindrical member and the second cylindrical member. 2. The brace damper according to claim 1, wherein an air hole is provided. 4. The brace damper according to claim 1, wherein the vertical spring casing is attached to an end of the brace via an elastic-plastic damper.