JPH108554A - Vibration control structure for building - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vibration control structure that can damp vibrations effectively when either of a small vibration or a big vibration is applied to a building and is available for easy replacement of an elasticated plastic damper in the case where residual deformation is present at the damper after a big vibration is applied. SOLUTION: In a rectangular main frame 14 constructed of column members 10, 10... and beam members 12, 12..., diagonal braces 18 and 18 placed in a V-shaped arrangement are connected at their upper ends with pins to corners 12a and 12a at both ends of the beam member 12 constituting the upper side. The lower ends of the diagonal braces 18 and 18 are connected to one end 12b of the beam member 12 constituting the lower side through an elasticated plastic damper 20 and a viscous damper 22 installed in a serial arrangement and connected with pins to the lower ends.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration damping structure for a building, and more particularly to a vibration damping structure for a building whose main frame is formed in a rectangular shape by column members and beam members.

[0002]

2. Description of the Related Art Japanese Patent Laid-Open No. 4-111870 (Int. Cl. E04H 9/0) discloses a vibration damping structure of this type of building.
2) is disclosed. As shown in FIG. 4, a V-shaped brace 3 is suspended from both intersections between adjacent column members 1 and 1 constituting a main frame and a beam 2 corresponding to a ceiling, and a lower end of the brace 3 is connected to the V-shaped brace 3. An elastic-plastic damper (4) configured as a lead extrusion damper is provided between the two column members (1) and (1), and a viscous damper (5) configured as a viscous shear damper between the lower end of the brace (3) and the horizontal member (6).
Is provided.

[0003]

The elasto-plastic dampers 4, 4 have a structure in which vibration energy is absorbed by yielding, and the elasto-plastic dampers 4, 4 are effective in damping large vibrations. Become. However, the elasto-plastic dampers 4 and 4 cannot obtain a vibration damping effect with respect to relatively small vibration until the dampers 4 and 4 are plasticized, and a high vibration damping effect is obtained when the dampers 4 and 4 are plasticized. However, there is a problem that deformation and stress remain in both the main frame and the elasto-plastic dampers 4 after the end of the input vibration.

On the other hand, the viscous damper 5 can attenuate the vibration by the damping resistance when the viscous fluid moves, and the effect of the vibration damping can be expected from the small vibration. As for the viscous damper 5, a high damping oil damper having a very high viscous damping coefficient has been proposed and is being developed for practical use.
When such a high-performance device is used, in order to cope with the high damping force transmitted from the viscous damper 5 to the main frame when a large vibration is input, the connection between the damper 5 and the main frame or the main frame itself is reinforced. For example, it is necessary to take measures such as giving a non-linearity to the viscous damping characteristic of the damper 5 to limit the input from the damper 5.

In such a conventional vibration damping structure for a building, the elasto-plastic dampers 4 and 4 and the viscous damper 5 provided at the lower end of the brace 3 are arranged in a side-by-side relationship. Therefore, the vibration input to the main frame including the column members 1 and 1 and the beam 2 is always input independently to the elasto-plastic dampers 4 and 4 and the viscous damper 5. For this reason, when a minute vibration is input to the building, even if the minute vibration is effectively absorbed by the viscous damper 5, the vibration is transmitted to the elasto-plastic dampers 4 and 4 via another path. , This elastic-plastic damper 4,
4 causes vibration to propagate. For this reason, despite the fact that the elasto-plastic dampers 4 and 4 and the viscous damper 5 are provided side by side, there is a case where the effect of damping the minute vibration by the viscous damper 5 cannot be sufficiently obtained.

When a large vibration is input to the building, the brace 3 is placed in parallel with the viscous damper 5.
Residual deformation and residual stress are generated in the elasto-plastic dampers 4 and 4 independently and firmly fixed between the lower end and the column members 1, 1. As a result, deformation and stress remain in the main frame. The elastic-plastic dampers 4 and 4 may need to be replaced.
When replacing these elasto-plastic dampers 4 and 4, there are various problems that the replacement operation is very complicated, for example, it is necessary to correct the deformation around the elasto-plastic dampers 4 and 4. Was.

In view of the above-mentioned problems, the present invention effectively attenuates both small and large vibrations to a building and reduces residual deformation due to the input of large vibrations. An object of the present invention is to provide a vibration damping structure of a building in which the generated elasto-plastic damper can be easily replaced.

[0008]

According to the present invention, a rectangular main frame is constituted by column members and beam members arranged at appropriate intervals in the horizontal and vertical directions. In a building, a pair of oblique braces is provided in a V-shape by connecting one end to each end or both corners of one side of the rectangular main frame, and the V-shaped oblique brace is provided. The end is configured by being connected to another side or another corner of the main frame via an elastic-plastic damper and a viscous damper arranged in series.

In the vibration damping structure for a building according to the present invention having the above structure, one end is pin-joined to both ends or both corners of one side of the rectangular main frame and arranged in a V-shape. Each other end of the pair of oblique braces is connected to the main frame via an elasto-plastic damper and a viscous damper. At this time, since the elasto-plastic damper and the viscous damper are arranged in series, The vibration force input to the building can be attenuated with a correlation between the elasto-plastic damper and the viscous damper. Therefore, when a small vibration is input to the building, the viscous damper acts to attenuate the vibration, and when a large vibration is input, the elasto-plastic damper and the viscous damper act to attenuate the vibration. Therefore, the vibration can be effectively attenuated regardless of the magnitude of the vibration input to the building.

Also, when a large vibration input causes residual deformation or residual stress to occur in the elasto-plastic damper and replaces it, the viscous damper arranged in series with the elasto-plastic damper has a deformation absorbing function. Accordingly, when a new elasto-plastic damper is mounted, flexibility can be provided by the viscous damper, and the operation of replacing the elasto-plastic damper is significantly facilitated.

Further, by arranging the elasto-plastic damper and the viscous damper in series, it is possible to prevent a load greater than the yield strength of the elasto-plastic damper from being input to the main frame, thereby simplifying the design of the main frame. it can.

[0012]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. 1 and 2 show an embodiment of a vibration damping structure of a building according to the present invention. FIG. 1 is a schematic configuration diagram of the vibration damping structure, and FIG. 2 is an explanatory view showing a deformed state of a main frame due to an input load. is there.

That is, in the building of the present embodiment, the main frame 1 having a ramen structure by the column members 10, 10,... And the beam members 12, 12,.
4 is constructed in a rectangular shape. FIG. 1 shows one main frame 1 constructed as a portal frame by a ramen structure.
4 is shown for convenience.

The main frame 14 formed in a rectangular shape has
The corners 12a, 12a at both ends of the beam member 12 serving as the upper side have V
The upper ends of the pair of oblique braces 18, 18 arranged in a letter shape are pin-connected, and these oblique braces 18,
Reference numeral 18 is attached in a state of being suspended from the upper beam member 12. The lower ends of the oblique braces 18, 18 are fixed or pin-connected to one end 12b of the beam member 12, which is the lower side, via an elastic-plastic damper 20 and a viscous damper 22, which are pin-connected thereto.

The elasto-plastic damper 20 and the viscous damper 2
2 are arranged in series with each other, the viscous damper 22 is disposed horizontally from the lower ends of the pair of oblique braces 18, 18, and the elasto-plastic damper 20 is pin-connected to the viscous damper 22 to be vertically And is connected to the lower beam member 12.

Here, the elasto-plastic damper 20 is designed to attenuate the vibration by the plastic absorbed energy at the time of yielding, and since the yield strength at this time is large, a damping force is generated for a large vibration. On the other hand, since the viscous damper 22 attenuates due to the movement of the viscous fluid, a damping force is generated from a small vibration. It is set as follows.

In the vibration damping structure for a building according to the present embodiment having the above configuration, when a vibration force due to an earthquake or the like is input to the building, the rectangular main frame 14 is horizontally moved when an earthquake occurs. It is deformed as shown in FIG. 2 with respect to the load F in the direction. That is, in the main frame 14 constituting the ramen structure, the column members 10, 10,... And the beam members 12, 12,. With the deformation of the main frame 14, the oblique braces 18,
18 generates tensile strain and compressive strain in its length direction, and vibration force is input to the elasto-plastic damper 20 and the viscous damper 22 with this deformation. That is, the oblique brace 1
Because one end of each of the members 8 and 18 is pin-connected to the beam member 12, only the axial force acts on the oblique braces 18 and 18 when the column members 10, 10... And the beam members 12, 12. Will do.

Since the elasto-plastic damper 20 and the viscous damper 22 are arranged in series, the vibration force input to the building acts on both the elasto-plastic damper 20 and the viscous damper 22, and Vibration damping can be performed with a correlation between both the plastic damper 20 and the viscous damper 22.

Therefore, when a small vibration is input to the main frame 14, the viscous damper 22 acts to attenuate the vibration, while when a large vibration is input, the elasto-plastic damper 20 yields. The elasto-plastic damper 20 and the viscous damper 22 act simultaneously to attenuate the vibration. Therefore, regardless of the magnitude of the vibration input to the main frame 14, the characteristics of the elasto-plastic damper 20 and the viscous damper 22 can be sufficiently utilized to effectively attenuate the vibration.

Further, since the elasto-plastic damper 20 and the viscous damper 22 are arranged in series, a load higher than the yield strength of the elasto-plastic damper 20 is prevented from being input to the main frame 14. . To elaborate on this point,
For example, when the above-mentioned viscous damper having a high viscous damping coefficient and excellent in energy absorbing ability is used alone, the damping force becomes extremely large as the interlayer response speed increases, and there is a possibility that the main frame may be damaged. Therefore, when incorporating such a high-performance viscous damper, it is necessary to take measures against damage to the main frame. Here, an elasto-plastic damper 20 that absorbs energy by yielding is adopted, and the elasto-plastic damper 20 and the viscous damper 22 are used.
Are arranged in series, since a load higher than the yield strength of the elasto-plastic damper 20 is not input to the main frame 14,
The design of the main frame 14 can be significantly simplified.

Further, in the present embodiment, when large vibration is input to the main frame 14 and residual deformation or residual stress is generated in the elastic-plastic damper 20, the elastic-plastic damper 20
When the elasto-plastic damper 20 is replaced, since the elasto-plastic damper 20 and the viscous damper 22 are arranged in series, the operation of replacing the elasto-plastic damper 20 is facilitated. . That is, since the viscous damper 22 arranged in series has a deformation absorbing function, the viscous damper 22 absorbs the residual deformation of the elasto-plastic damper 20 by the function of the viscous damper 22, and a new elasto-plastic damper 20 is mounted. Can be facilitated.

To summarize the above description, the vibration absorbing effect is mainly obtained by the viscous damper 22 for small and medium vibration inputs. For a large vibration input, the viscous damper 22 mainly works at a small amplitude, and at a large amplitude, both the viscous damper 22 and the elasto-plastic damper 20 work to exhibit a vibration absorbing effect. By appropriately setting the yield strength of the elasto-plastic damper 20, the damping force transmitted to the connection between the damper system composed of the viscous damper 22 and the elasto-plastic damper 20 and the main frame 14 or the main frame 14 itself is not excessive. As easy to control. At the end of the vibration input, no stress remains in both the main frame 14 and the damper system. Therefore, even if the elasto-plastic damper 20 needs to be replaced, the replacement is easy.

In this embodiment, the V-shaped ends (upper ends in the figure) of the pair of oblique braces 18, 18 are pin-connected to both end corners 12a, 12a of the beam member 12 on the upper side. Although the case has been disclosed, the one end of each of the oblique braces 18 may be pin-connected to both ends of the upper side beam member 12, or the both ends of the lower side beam member 12. Alternatively, pins can be connected to both ends. On the other hand, the other end (the lower end in the figure) of the oblique braces 18, 18 is also disclosed in which the elasto-plastic damper 20 and the viscous damper 22 are arranged in series and connected to one end 12b of the lower beam member 12. However, the present invention is not limited to this, and the beam member 12 may be coupled to the upper beam member 12 or a corner of the end portion.

FIG. 3 shows another embodiment, in which the same components as those in the above-described embodiment are denoted by the same reference numerals, and a description thereof will be omitted. FIG. 3 is a schematic configuration diagram corresponding to FIG. In this embodiment, as in the previous embodiment, the upper ends of a pair of oblique braces 18, 18 arranged in a V-shape are
Pins are connected to the corners 12a, 12a at both ends of the beam member 12 serving as the upper side.
A pair of elasto-plastic dampers 20 and viscous dampers 22 connected to each lower end of the pair are provided on the left and right. Of course, the pair of elasto-plastic dampers 20 and viscous dampers 22 provided on the left and right in this manner are respectively arranged in series.

Therefore, in this embodiment, the same function as that of the above embodiment is exerted, and the elasto-plastic damper 20 and the viscous damper 22 are provided as a pair, respectively, so that the overall vibration damping force is further increased. it can. On the other hand, by providing a pair of the elasto-plastic damper 20 and the viscous damper 22, in order to obtain a vibration damping effect equivalent to that of the above-described embodiment, it is necessary to reduce the size of the elasto-plastic damper 20 and the viscous damper 22. it can.

[0026]

As described above, in the vibration damping structure for a building according to the present invention, one end is pin-connected to both ends or both ends of one side of a rectangular main frame, and is arranged in a V-shape. The other end of the pair of oblique braces was connected to the main frame via an elasto-plastic damper and a viscous damper, and the elasto-plastic damper and the viscous damper were arranged in series, so that the input was applied to the building. The vibration force can be attenuated with a correlation between the elasto-plastic damper and the viscous damper. Therefore, when a small vibration is input to the building, the viscous damper acts to attenuate the vibration, and when a large vibration is input, both the elasto-plastic damper and the viscous damper act to attenuate the vibration. I do. Therefore, the vibration can be effectively attenuated regardless of the magnitude of the vibration input to the building.

Further, when the elastic-plastic damper is replaced by a residual deformation or residual stress caused by a large vibration input,
Since this elasto-plastic damper is arranged in series with the viscous damper having the deformation absorbing function, it is possible to easily mount a new elasto-plastic damper.

Furthermore, by arranging the elasto-plastic damper and the viscous damper in series, it is possible to prevent a load greater than the yield strength of the elasto-plastic damper from being input to the main frame, and to simplify the design of the main frame. It has excellent effects.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing one embodiment of a vibration damping structure for a building according to the present invention.

FIG. 2 is an explanatory view showing a deformed state when a horizontal load is applied to a main frame shown in one embodiment of the vibration damping structure of the present invention.

FIG. 3 is a schematic configuration diagram showing another embodiment of the vibration damping structure of a building according to the present invention.

FIG. 4 is a schematic configuration diagram showing a conventional vibration damping structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Column member 12 Beam member 14 Main frame 18 Oblique brace 20 Elasto-plastic damper 22 Viscous damper

Claims (1)

[Claims] 1. A building in which a rectangular main frame is constituted by column members and beam members arranged at appropriate intervals in the horizontal and vertical directions, both ends of one side of the rectangular main frame. Alternatively, a pair of oblique braces is provided in a V-shape by joining one end of each to the corners at both ends, and the other end of the V-shaped oblique brace is connected via an elastic-plastic damper and a viscous damper arranged in series. A vibration damping structure for a building, wherein the vibration damping structure is coupled to another side or another corner of the main frame.