JPH1171934A - Vibration control structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vibration control structure which has a favorable energy- absorption effect even when a small deformation difference has arisen in the inside of a building and which does not give an adverse influence to the building body even when an intensive earthquake has occurred. SOLUTION: First and second brace-constituting members 8, 9 are arranged within the plane 6 of structure surrounded by columns 5 and beams 4 constituting the frame structure 3 of a building. One side ends 8a, 9a of the brace- constituting members 8, 9 are fixed to different positions of the frame structure 3 respectively and the other side ends 8b, 9b thereof are connected to an insertion beam 10 arranged so as to extend within the plane 6 of structure and arranged to have different axial lines. And further, the part positioning between the first and second joints 12, 13 formed by the insertion beam 10 and the first and second brace-constituting members 8, 9, is formed of an extra-mild steel panel 16 and a viscous damper 11 is interposed between the end 10a of the insertion beam 10 and the beam 4.

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 installed in a building to reduce a response when horizontal vibration acts on the building.

[0002]

2. Description of the Related Art In recent years, buildings have been required to have a high level of seismic safety. In particular, various types of vibration control structures capable of significantly reducing the vibration response of buildings due to earthquakes have been proposed. . The most common of these vibration damping structures is a structure using a damper. A vibration damping structure using a damper uses a deformation difference (deformation between layers, etc.) generated in each member in a building to give deformation and speed to a damper to perform work, thereby absorbing input energy during vibration. Things.

[0003]

However, a vibration damping structure using the above-described damper is, for example, an SRC.
In a building having a large rigidity such as a building or an RC building, application is difficult because a difference in deformation generated between members in the building is small.

In order to obtain an energy absorbing function even in a small deformation, it is conceivable to form a vibration damping structure using a viscous damper.
It has the property that the damping force increases infinitely in proportion to the power of the speed of the viscous body, and when a strong earthquake occurs, the control force (damping force of the damper) during the earthquake becomes excessive and the building There is a concern that the main body structure may be damaged.

[0005] The present invention has been made in view of the above circumstances, and it is possible to obtain a good energy absorption effect even if the deformation difference generated inside the building is small, and to provide a structure that can be used even when a strong earthquake occurs. An object of the present invention is to provide a vibration damping structure that does not adversely affect a building body.

[0006]

In the present invention, the following means are employed in order to solve the above-mentioned problems. That is, the vibration damping structure according to the first aspect includes first and second brace components arranged in a plane surrounded by columns and beams constituting a frame of the building, and the first and second brace components are provided. The second brace component is fixed at one end to each of the different positions of the frame, and the other end is joined together to a long member arranged so as to extend into the construction surface, and The first and second brace components are arranged with their axes different from each other, and the first and second brace components are joined by joining the long member and the first and second brace components. A joint is formed, and a part of the long member is coupled to the column or beam via a damper, and at least a part of a portion located between the first and second joints is formed. , Compared to the other parts Wherein the stress is formed by a small steel.

In this vibration damping structure, the axial force of the first and second brace components can be concentrated on the portion where the steel material is located. Also, since the first and second brace components are arranged with their axes different from each other, when horizontal vibration is applied to the building, the axes of these first and second brace components are changed. The force acts on the elongate member as a moment, and as a result, the elongate member is rotationally displaced. Therefore, the displacement of the frame is amplified and transmitted by the "leverage principle" to the damper provided between the long member and the column or the beam via the long member.

According to a second aspect of the present invention, there is provided a vibration damping structure according to the first aspect, wherein the steel material is made of extremely mild steel.

Due to the above-described configuration, in this vibration damping structure, the steel material can exhibit excellent energy absorption performance as a hysteretic damper.

According to a third aspect of the present invention, there is provided a damping structure according to the first or second aspect, wherein the damper is a viscous damper.

[0011] Because of the above configuration, the vibration damping structure can function effectively even when a minute vibration acts on the building.

According to a fourth aspect of the present invention, in the vibration damping structure, a brace disposed in a structure surrounded by left and right columns and upper and lower beams of the building, and a brace disposed in the structure and between the upper and lower beams And an upper end and a lower end thereof are pin-joined to the upper and lower beams, and at least a part of an intermediate portion in a longitudinal direction thereof is formed of extremely mild steel. The brace has one end fixed to a part of the column or the beam, the other end fixed to a part of the support, and a damper provided at an intermediate portion in a longitudinal direction thereof. It is characterized by being.

In this vibration damping structure, when interlayer deformation occurs in the building, the columns are rotationally displaced, and the displacement of the columns causes the braces to be deformed in the axial direction. Also, when the interlayer deformation becomes excessive, the part where the ultra mild steel is located yields and plastically deforms,
It absorbs the vibration energy of the building, so as not to put an excessive burden on the main body structure.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, first and second embodiments of the present invention will be described with reference to the drawings. [First Embodiment] FIG. 1 is a diagram showing an example of a first embodiment of the present invention, in which reference numeral 1 denotes a vibration damping structure. The vibration damping structure 1 is installed in a construction surface 6 surrounded by upper and lower beams 4 and 4 and left and right pillars 5 and 5 which constitute a part of a frame 3 of a building. Further, as shown in the figure, the vibration damping structure 1 includes a first brace component 8, a second brace component 9, a through beam (elongated member) 10, and a through beam 10. It is roughly constituted by oil dampers (viscous dampers) 11, 11,... Provided between the ends 10a, 10a and the beams 4, 4.

The first brace components 8, 8 have one ends 8a, 8a fixed to the upper beam 4a, and the other ends 8b, 8b joined to the through beam 10,
The first joints 12 are formed together with the beam 10. In addition, the second brace components 9, 9
Is formed of the same material and dimensions as the first brace components 8, 8, one end 9a of which is fixed to the lower beam 4b, and the other end 9b, 9b Are joined to the beam 10 to form the second joints 13 with the beam 10.

The beam 10 is formed of an H-shaped steel made of high-strength steel and has first joints 12 and 12.
A part of the web 10 b is formed of an extremely mild steel panel (steel material) 16 at a central portion 15 in the longitudinal direction located between the second joining portions 13 and 13.

Further, the first brace component 8 and the second brace component 9 located diagonally across the ultra-mild steel panel 16 are symmetrically located with respect to the ultra-mild steel panel 16, and have their axes 8c and 8c. 9c do not match. Oil damper 1
, 1,... Have both ends 11 a, 11 a,.

FIG. 2 is a diagram showing a situation near the ultra-mild steel panel 16. As shown in FIG.
Is inserted between the flanges 10c of the through beam 10 and is welded thereto. Further, rib plates 18 and 18 are provided adjacent to the extremely mild steel panel 16. Thereby, the AA cross section in FIG.
As shown in FIG.

The above is the main configuration in the present embodiment. Next, how the vibration damping structure 1 functions during an earthquake will be described. At the time of an earthquake, horizontal vibration acts on the frame 3, and as a result, the beams 4,
Between layers 4, a horizontal interlayer displacement δ _H is generated. FIG. 4 schematically shows the situation at this time. In this case, as shown in FIG.
A pair of first and second brace components 8 and 9 provided at positions symmetrical with respect to each other have an axial force N _{1 in the} compression direction, and another pair of first and second brace components. An axial force N ₂ in the tensile direction acts on 8, 9.

Since the first and second brace components 8 and 9 of each set are arranged with their axes 8c and 9c (see FIG. 1) being different, the axial forces N ₁ and N ₂ are Bridge 1
0 acts as a rotational moment. Therefore, at this time, the beam 10 is rotationally displaced about the central portion 15 in the longitudinal direction, and the rotational displacement is based on the principle of leverage.
As a result, it is amplified and transmitted to the ends 10a, 10a of the beam 10. Thereby, the end 10a of the beam 10
Oil damper 1 interposed between 10a and beams 4 and 4
.. Are greatly expanded and contracted in the axial direction, and act to exhibit good energy absorption performance.

At this time, since the first and second brace components 8 and 9 of each set are symmetrically positioned with respect to the ultra-mild steel panel 16, their horizontal component forces are the same, and therefore the through beam No axial force acts on 10, but only a shear force acts. Therefore, the oil dampers 11, 1
The ends 11a, 11a,... Of the first,.

In the above case, the relationship between the horizontal interlayer displacement δ _H of the frame 3 and the amount of expansion / contraction δ _v of the oil damper 11 is expressed by the following equation. First, the interlayer displacement δ _H
When the inclination angle φ _c of the pillar when h occurs, assuming that h is the floor height of the floor where the vibration damping structure 1 is installed as shown in FIG.

(Equation 1) It can be expressed as.

At this time, as shown in FIG. 5, the horizontal length of the portion where the ultra-mild steel panel 16 is installed is l ₁ , and the first and second brace components 8, 8 and 9, 9 are provided. Assuming that the projected length dimension in the horizontal direction is l ₂ , the inclination angle φ _{B of the} beam is

(Equation 2) It is expressed as

Therefore, the expansion and contraction amount δ _v of the oil damper 11 is

(Equation 3) here,

(Equation 4) Therefore, according to the "lever principle", the oil damper 1
The expansion / contraction amount δ _{v of} 1 is increased by α times the interlayer displacement δ _H.

For example, l ₁ = 0.8 m, l ₂ = 2 m, l =
In the case of 5 m and h = 4 m, α = 3.0, and therefore, it is possible to construct a highly efficient viscous damper mechanism using interlayer displacement.

When the interlayer displacement δ _H becomes excessive, the first and second brace components 8, 8 and 9,
The mild mild steel panel 16 on which the axial forces N ₁ and N ₂ of FIG. 9 are concentrated yields and undergoes plastic deformation as schematically shown in FIG. 6. Therefore, the vibration damping structure 1 functions as a hysteresis damper. Will demonstrate. At this time, in the beam 10, since the extremely mild steel panel 16 mainly absorbs the deformation, the deformation transmitted to the oil dampers 11, 11,. , And the control force of the oil dampers 11, 11,... Does not become excessive.

FIG. 7 is a graph schematically showing the characteristics of the vibration damping structure 1 described above. The graph of FIG. 7 is a graph showing the restoring force characteristics of the frame 3 composed of the beams 4 and 4 and the columns 5 and 5, in which the horizontal axis represents the frame 3
The vertical axis represents the horizontal load Q acting on the frame 3. Also, (a) in the figure shows a case where a relatively small horizontal deformation occurs in the frame 3, and (b) shows a case where a large horizontal deformation occurs in the frame 3 due to a strong earthquake or the like. I have.

In the case of a wind with a small value of δ or a small earthquake,
The vibration damping structure 1 mainly functions as a viscous damper, and the restoring force characteristics of the frame 3 are as shown in FIG. In the case of a large earthquake with a large value of δ,
When the mild steel panel 16 yields, the vibration damping structure 1
Will function as a history damper,
The restoring force characteristics of the frame 3 are as shown in FIG.

As described above, in the above-described vibration damping structure 1, in the event of a large earthquake, the part of the mild steel panel 16 having a smaller yield point than the other part of the beam 10 is plastically deformed and the frame 3
By absorbing the vibration energy, the seismic force acting on the frame 3 can be reduced, and the seismic safety of the building can be improved. Further, since acceleration during an earthquake can be reduced, it is possible to prevent damage to furniture, fixtures, equipment, and the like inside the building. Furthermore, since the seismic force acting on the building can be reduced, the cross section of each structural member constituting the frame 3 can be reduced, and the cost of the structural skeleton can be reduced.

In particular, since the vibration damping structure 1 employs a structure in which the interlayer displacement is concentrated on the ultra-mild steel panel 16, the shear strain at this portion can be increased, and the function as a hysteresis damper can be obtained. Can be effectively exhibited.

Further, the first and second brace components 8, 8 and 9, 9 are connected to their axes 8c, 8c and 9 respectively.
c, 9c do not coincide with each other, so that the interlayer displacement δ
_H can be transmitted as rotational displacement to the beam 10 via the first and second brace components 8, 8 and 9, 9, whereby the ends 10 a, 10 a of the beam 10
Are greatly expanded and contracted, and an excellent vibration damping effect can be obtained.

Further, at the time of a large earthquake, the extremely mild steel panel 16 is deformed as described above, so that the oil dampers 11 and
Are suppressed, whereby the control force of the oil dampers 11, 11,... Does not become excessive, and there is no fear that the frame 3 is adversely affected. Thus, the vibration damping structure 1 can exert an appropriate vibration damping effect according to the magnitude of the vibration force acting on the frame 3.

As described above, the interlayer deformation during an earthquake can be concentrated on the ultra-mild steel panel 16, and the oil dampers 11, 11,.
Since this interlayer deformation can be transmitted in an enlarged manner,
This vibration damping structure 1 is composed of an RC structure having relatively small interlayer deformation,
It is also suitable for SRC buildings.

Further, in the vibration damping structure 1, since the extremely mild steel panel 16 is yielded in advance, the first and second brace components 8, 8, and 9,
9 never surrenders. Therefore, there is no fear of out-of-plane buckling or replacement of the first and second brace components 8, 8 and 9, 9. Generally, an architectural plan in which a brace is built in a partition wall is often used. In this case, if the damping structure 1 of the present embodiment is applied, there is no need to remove the wall after the earthquake and replace the brace, The burden on the resident and repair work are reduced, and the construction period can be shortened.

Further, since the damping structure 1 is of a brace type, unlike the other damping structures in which a viscous damper or a viscoelastic damper is formed in a wall shape, the first and second brace components 8 are provided. , 8 and 9, 9 and the frame 3, etc., can be used to secure necessary equipment piping space in the building surface.

Further, in the vibration damping structure 1, since the portion that yields first is formed of extremely mild steel, yielding occurs when small deformation acts, thereby increasing the hysteresis absorption energy. Thus, it is possible to construct an efficient shear yielding type steel damper. Further, a stable vibration damping effect can be obtained without being affected by the temperature or the frequency of the earthquake.

Further, in the vibration damping structure 1, the beam 10
Are oil dampers (viscous dampers) 11, 11,..., It is possible to obtain an effective vibration damping effect against wind vibration, small and medium earthquakes, and the like.

Although one embodiment of the present invention has been described above, the present invention is not limited to the above-described embodiment, and other configurations may be adopted in the above-described embodiment without departing from the gist of the present invention. May be adopted.

For example, in the above embodiment, instead of the oil dampers 11, 11,..., Another viscous damper using a viscoelastic material such as a butane-based polymer material or rubber asphalt is used. It may be.

In the above embodiment, the mild steel panel 16 and its vicinity may be formed as shown in FIG. FIG. 8 (a) shows the extremely mild steel panel 16
Flanges 10c, 10c and rib plates 18, 1
8 is attached via angle pieces 20, 20,..., And FIG. 8B shows a BB cross section in FIG.

As shown in these figures, as shown in FIG.
, And between the angle pieces 20, 20,... And the flanges 10c, 10c and the rib plates 18, 18, high-strength bolts 21,
21 ... are joined.

By attaching the ultra-mild steel panel 16 in this way, even if the ultra-mild steel panel 16 is excessively deformed by the earthquake, it can be easily replaced after the earthquake.

Apart from these, in the above embodiment, the vibration damping structure 1 may be configured as shown in FIGS. The vibration damping structure 23 shown in FIG.
Are provided only between the end portions 10a, 10a of the lower beam 4b and the lower beam 4b.

The damping structure 25 shown in FIG. 10 is formed by disposing a column (elongated member) 26 in the construction surface 6 instead of the beam 10 in the above embodiment. . The strut 26 is made of an H-shaped steel like the through beam 10, and its web 26 b is formed by the ultra-mild steel panel 16 at a central portion 26 a in the longitudinal direction. Further, the first and second brace components 8, 8 and 9, 9 joined to the column 26 via the first joints 12, 12 and the second joints 13, 13 have their axes aligned. 8c, 8c and 9c, 9c are arranged so as not to coincide with each other. Further, one ends 11a of the oil dampers 11, 11 arranged in parallel with the beams 4, 4 are fixed to both ends 26c, 26c of the column 26, and the other ends 11a of the oil dampers 11, 11 are fixed.
b and 11b are configured to be fixed to the beams 4 and 4.

The vibration damping structure 27 shown in FIG. 11 includes upper and lower beams 4 and 4 and studs 2 provided between the upper and lower beams 4 and 4.
It is installed in a space surrounded by 8, 28. As shown in the figure, the vibration damping structure 27 is generally composed of the through beam 10 and the first and second brace components 8, 8 and 9, 9 similarly to the vibration damping structure 1 in the above embodiment. However, the oil dampers 11, 11 are joined to the end portions 10a, 10a of the through beam 10, the cylinder portions 11c, 11c of the oil dampers 11, 11, and the upper and lower piston rod portions 11d of each oil damper 11, respectively. , 11d
Are bracket portions 28a provided on the stud 28.
Is different from the vibration damping structure 1 in that it is joined to

With the vibration damping structures 23, 25, and 27 shown in FIGS. 9, 10, and 11, it is possible to obtain the same operations and effects as those of the vibration damping structure 1 in the above embodiment during an earthquake. Become.

[Second Embodiment] Hereinafter, a second embodiment of the present invention will be described with reference to FIGS.
In the second embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

As shown in FIG. 12, the vibration damping structure 30
It is roughly composed of a support 31 and braces 32, 32,. The strut 31 is formed of an H-shaped steel made of high-strength steel, and both ends 31a, 31a are pin-joined to upper and lower beams 4a, 4b. 31c is formed by the ultra mild steel panel 16. The brace 32 is provided between the column 31 and the beams 4 and 4, and a viscoelastic damper 34 using rubber asphalt is provided at an intermediate portion 32a in the length direction. .

The vibration damping structure 30 configured as described above
Functions as follows when seismic force acts on the frame 3. That is, during an earthquake, interlayer displacement occurs in the frame 3, and as shown in FIG.
And 4b are relatively displaced in the horizontal direction. This allows
Post 3 pin-joined to these beams 4a and 4b
1 will be rotationally displaced as shown in FIG.

When the column 31 is displaced as described above,
Brace 3 attached between column 31 and beams 4 and 4
, 32,... Are applied alternately to the compressive or tensile directions, so that the viscoelastic damper 34 attached to the intermediate portion 32a of the brace 32 is deformed to absorb vibration energy. Will be demonstrated.

Further, when the seismic force acting on the frame 3 is strong, the column 31 is simply a brace 32,
.. Cannot follow the interlayer deformation of the frame 3 only by the rotational displacement accompanying the deformation of 32,...

Therefore, the vibration energy of the frame 3 is absorbed by the hysteresis energy of the ultra-mild steel panel 16, and the seismic safety of the building is improved. Further, at this time, the extremely mild steel panel 16
The brace 3
Excessive deformation does not act on 2, 32,.

In this vibration damping structure 30, since the strut 31 is pin-joined to the beams 4 and 4, the strut 31 is rotationally displaced following the interlayer deformation of the frame 3 during an earthquake. The viscoelastic damper 34 that constitutes the intermediate portion 32a of the brace 32 provided between the column 31 and the beams 4, 4 can exert a vibration damping effect. Further, since the damper provided in the brace 32 is a viscoelastic damper, an excellent vibration damping effect is exhibited even with wind vibration or small and medium-sized earthquakes, thereby improving the livability in the building.

Further, when a large earthquake occurs, the support 31
Of these, the extremely mild steel panel 16 plastically deforms, thereby absorbing the seismic input energy of the frame 3 and thereby obtaining a vibration damping effect. Further, in the column 31, since the ultra-mild steel panel 16 exerts a large deformation absorbing ability, the deformation acting on the braces 32, 32,... Is suppressed, so that the control force of the viscoelastic damper 34 becomes excessive. There is no burden on the frame 3.

As described above, in the vibration damping structure 30 as well, from a relatively small vibration caused by a wind or a small earthquake to a large vibration caused by a large earthquake, an appropriate vibration force is applied to the frame 3 according to the magnitude of the vibration force acting on the frame 3. A large vibration damping effect is exhibited.

In the above-described embodiment, other configurations may be adopted for the structure, material, and the like of each part of the vibration damping structure 30 without departing from the gist of the present invention. For example, the viscoelastic damper 34 may use a high damping rubber or the like.

[0057]

As described above, in the vibration damping structure according to the first aspect, the first and second brace components are joined to the long member with their axes different from each other. A part of a portion of the long member located between the first and second joints is formed of a steel material having a lower yield strength than other portions, and the long member and the frame And a damper interposed therebetween. Therefore, at the time of a large earthquake, the interlayer displacement can be made to act collectively on the steel material, and a vibration damping effect can be obtained by hysteresis absorption energy accompanying plastic deformation of this portion. In addition, when vibrations due to a small or medium-sized earthquake or wind act on the building, the steel does not yield, the interlayer displacement of the building is transmitted as a rotational moment to the long member, and the long member is `` leveraged ''. Rotational displacement is performed according to the principle, and interlayer displacement is enlarged and transmitted to the damper, so that a vibration damping effect is obtained. Also, in the event of a large earthquake, since the steel material exhibits a large deformation capacity, excessive deformation does not act on the damper, and even if the damper is composed of a viscous damper etc., the control force by the damper Is not excessively large and does not adversely affect the frame. Therefore, according to the vibration damping structure, an appropriate vibration damping effect is exhibited according to the magnitude of the vibration force acting on the frame. Also, as described above, interlayer deformation during an earthquake
The vibration damping structure is suitable for use in RC and SRC buildings with relatively small interlayer deformation because the steel bars are concentrated and transmitted to the damper in an enlarged manner. . Further, since the vibration damping structure is configured to yield the steel material prior to the other portion of the long member, the first and second brace components do not yield,
Therefore, there is no need to worry about these out-of-plane buckling or replacement. Generally, architectural plans often include a brace inside the partition, but in this case, if the damping structure of the present invention is applied, it is not necessary to remove the wall and replace the brace after an earthquake, and to residents. Burden and repair work are reduced,
In addition, the construction period can be shortened.

In the vibration damping structure according to the second aspect, since the steel material that yields first is formed of extremely mild steel, yielding occurs when a small deformation acts on this portion, whereby the hysteresis is absorbed. By increasing the energy, it is possible to construct a highly efficient shear yield type steel damper. Further, a stable vibration damping effect can be obtained without being affected by the temperature or the frequency of the earthquake.

In the vibration damping structure according to the third aspect, since the damper is formed by the viscous damper, an effective vibration damping effect can be obtained even for wind vibration, small and medium earthquakes, and the like.

In the vibration damping structure according to the fourth aspect, since the strut is joined to the beam with a pin, the strut is rotated and displaced following the interlayer deformation of the frame during an earthquake. The viscoelastic damper which constitutes the middle part of the brace provided between them can exert a vibration damping effect. In addition, the damper provided on the brace is a visco-elastic damper, so it will exhibit an excellent vibration damping effect even against wind vibration and small and medium earthquakes, thereby improving the livability inside the building. it can. Furthermore, when a large earthquake occurs, the mild steel provided in the middle part of the column in the longitudinal direction absorbs the seismic input energy of the frame by plastically deforming before the other part of the column. Thus, a damping effect can be obtained. At this time,
In the column, since the ultra-mild steel exerts a large deformation capacity, the deformation acting on the brace is suppressed, and therefore, the control force of the viscoelastic damper is not excessive, so that no load is imposed on the frame. Therefore, according to the vibration damping structure of the present invention, from a relatively small vibration caused by a wind or a small earthquake to a large vibration caused by a large earthquake, appropriate vibration damping is performed according to the magnitude of the vibration force acting on the frame. The effect will be exhibited.

[Brief description of the drawings]

FIG. 1 is a front view of a vibration damping structure schematically showing a first embodiment of the present invention.

FIG. 2 is an enlarged front view showing an extremely mild steel panel (steel material) used in the vibration damping structure shown in FIG.

FIG. 3 is a sectional view taken along the line AA in FIG. 2;

FIG. 4 is a front view of the vibration damping structure schematically showing a behavior of the vibration damping structure when a vibration acts on the frame shown in FIG. 1;

FIG. 5 is a diagram showing a correspondence relationship between dimensions and reference numerals of respective members of the vibration damping structure shown in FIG.

FIG. 6 is a front view of the vibration damping structure schematically showing the behavior of the vibration damping structure when a large-scale vibration is applied.

7A and 7B are diagrams conceptually showing restoring force characteristics of a frame on which the vibration damping structure of the present invention is installed, wherein FIG. 7A shows a case where a small-scale vibration acts on the frame, and FIG. It is a graph at the time of a large-scale vibration acting.

FIG. 8 is a view showing another example of installation of the ultra mild steel panel (steel material) shown in FIGS. 1 and 2, (a) is a front view thereof,
(B) is sectional drawing in the BB arrow line in (a).

FIG. 9 is a front view showing a modification of the vibration damping structure shown in FIG.

FIG. 10 is a front view showing another modified example of the embodiment.

FIG. 11 is a front view showing another modification.

FIG. 12 is a front view of a vibration damping structure schematically showing a second embodiment of the present invention.

FIG. 13 is a front view of the vibration damping structure schematically showing a behavior of the vibration damping structure when a vibration acts on the frame shown in FIG. 12;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Damping structure (1st Embodiment) 3 Frame 4 Beam 5 Column 6 Construction surface 8 First brace constituent material 8a One end 8b Other end 8c Axis 9 Second brace constituent material 9a One end 9b Other end 9c Axis 10 Beam (long member) 11 Viscous damper 12 First joint 13 Second joint 16 Extremely mild steel panel 23 Damping structure (first embodiment) 25 Damping structure (first embodiment) 26 strut (long member) 27 damping structure (first embodiment) 30 damping structure (second embodiment) 31 strut 31a both ends 32 brace 34 viscoelastic damper

Claims (4)

[Claims] The present invention comprises first and second brace components disposed in a plane surrounded by columns and beams constituting a frame of a building, wherein the first and second brace components are provided. , One end of each of which is fixed to a different position of the frame,
The other end is joined together to a long member arranged so as to extend in the construction surface, and these first and second brace components are
The first and second joining portions are formed by joining the elongated member and the first and second brace components, and the elongated members are arranged at different axes. A steel material which is partly coupled to the column or beam via a damper, and at least part of a part located between the first and second joints has a smaller yield stress than other parts A vibration damping structure characterized by being formed by. 2. The vibration damping structure according to claim 1, wherein said steel material is made of extremely mild steel. 3. The vibration damping structure according to claim 1, wherein the damper is a viscous damper. 4. A brace disposed in a structure surrounded by left and right pillars and upper and lower beams of a building, and a brace disposed in the structure and erected between the upper and lower beams. The strut has an upper end and a lower end that are pin-joined to the upper and lower beams, and at least a part of an intermediate portion in a longitudinal direction thereof is formed of extremely mild steel. It is characterized in that it is fixed to a part of the column or the beam, the other end is fixed to a part of the column, and a viscoelastic damper is provided at an intermediate portion in the length direction. Damping structure.