JP2025123473A - Brace mounting structure to pillar - Google Patents

Abstract

To provide an attachment structure of a brace to a column capable of preventing occurrence of out-of-plane deformation and buckling on the column bearing axial force of the brace.SOLUTION: A structure is configured to attach a column-side joint end 15y of a brace 15 provided in a column-beam frame 5 constructed by joining a column 2 and a beam to the column, wherein the column is provided with: a pair of joint plates 24 provided by being joined to a pair of column surfaces of both sides in a column width direction; a base plate 25 joined to both of the pair of joint plates and provided in an arrangement facing the column in the column-beam frame; and a brace connection plate 26 provided by being joined to the base plate and connected to the column-side joint end of the brace.SELECTED DRAWING: Figure 2

Description

The present invention relates to a mounting structure for a brace to a column that can prevent out-of-plane deformation or buckling in the column that bears the axial force of the brace.

A structure for attaching the column-side joint end of a brace provided in a frame constructed by joining columns and beams to a column is known, for example, from Patent Document 1. The "earthquake-resistant reinforcement joint structure" of Patent Document 1 is a metal joint for joining an earthquake-resistant reinforcement member to a structural member having a square or circular cross section, in which the metal joint has a joint portion that is in surface contact with one surface of the structural member, and the metal joint and one surface of the structural member are joined with adhesive or high-strength bolts, and the metal joint has a reinforcing portion on the opposite side of the joint, and at least one horizontal reinforcing rib is fixed to the reinforcing portion.

Japanese Patent Application Laid-Open No. 2004-270320

In the background art, metal joints are surface-joined to structural members such as pillars with adhesive or the like.
There was a risk that the axial force of the brace connected to the metal fittings would cause out-of-plane deformation in the structural members along with the metal fittings. When out-of-plane deformation occurs in a structural member, the axial force borne by that structural member makes it more susceptible to buckling. This posed a problem in that the column-beam frame could fail before the braces could fully exert their strength.

The present invention was devised in consideration of the above-mentioned conventional problems, and aims to provide a mounting structure for a brace to a column that can prevent out-of-plane deformation or buckling in the column that bears the axial force of the brace.

The structure for mounting a brace to a column according to the present invention is a structure for mounting the column-side joint end of a brace provided in a frame constructed by joining a column and a beam to the column, and is characterized in comprising a pair of joining plates provided on the column and joined to a pair of column surfaces on both sides in the column width direction, a base plate joined to both of the pair of joining plates and provided in the frame in an arrangement facing the column, and a brace connecting plate provided and joined to the base plate and connected to the column-side joint end of the brace.

The base plate is characterized by being positioned with a gap between it and the pillar.

The base plate is characterized by being placed in contact with the pillar.

The base plate has a pair of first joint points with the pair of joining plates and a pair of second joint points with the brace connecting plate on the front and back sides, respectively, and the second joint points are located between the pair of first joint points.

A reinforcing rib material is provided and joined to both the base plate and the brace connecting plate.

The brace connecting plate and the brace are connected via a vibration damper that has an arm plate and attenuates external vibration forces with a torsional moment, and the brace connecting plate and the arm plate are rotatably connected via a pin that is inserted into a pin hole that connects them.

The brace connection plate has one end located on the opposite side of the brace connection plate across the arm plate in the direction of insertion of the pin and having an additional pin hole through which the pin is rotatably inserted, and the other end joined to the brace connection plate, and is characterized in that reinforcing hardware is provided on both sides of the arm plate to support both ends of the pin together with the brace connection plate.

The reinforcing rib material is characterized in that it is arranged near the pin hole of the brace connecting plate.

The brace-to-column mounting structure of the present invention can prevent out-of-plane deformation and buckling in the column that bears the axial force of the brace.

1 is a front view showing a preferred embodiment of a brace-to-column mounting structure according to the present invention. FIG. FIG. 2 is an enlarged view of a main part of the structure for attaching the brace to the column shown in FIG. 1 . This is a view taken along the line AA in FIG. FIG. 2 is an exploded perspective view of the vibration damper shown in FIG. 1 . FIG. 2 is an enlarged view of the brace shown in FIG. 1 . 5. This is a cross-sectional view taken along the line BB in FIG. 5. FIG. 3 is an explanatory diagram illustrating a case where the second pin shown in FIG. 2 is supported at one end. FIG. 3 is an explanatory diagram illustrating a case where the second pin shown in FIG. 2 is supported at both ends. 10 is a schematic diagram showing a modified example of the mounting structure of the brace to the column according to the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the brace-to-column mounting structure according to the present invention will be described in detail below with reference to the accompanying drawings.

1 shows the overall configuration of a beam-column frame 5 equipped with a vibration damper 1 as an example of a frame to which the brace-to-column mounting structure according to this embodiment is applied. The vibration damper 1 is provided between a brace 15 joined to a beam 3 and a column 2.

First, we will explain the vibration damper 1. As shown in Fig. 1, the vibration damper 1 is provided inside a rectangular column-beam frame 5 (see Fig. 10) made of steel, reinforced concrete, steel-reinforced concrete, or wood, constructed by joining a pair of left and right columns 2 (only the left column is shown in the illustrated example) and a pair of upper and lower beams 3 (only the upper beam is shown in the illustrated example) at column-beam joints 4.

The illustrated example is a steel-framed beam-column structure 5, in which the beams 3 are made of I-section steel and the columns 2 are made of hollow steel pipes with a square cross section (see Figure 3). The columns 2 may have any cross-sectional shape, such as a circular cross section.

When the column-beam frame 5 is deformed by external vibration forces in the left-right lateral and up-down vertical directions that occur during an earthquake or the like, the vibration damper 1 absorbs and attenuates the energy of the external vibration forces.

As shown in FIGS. 1, 2 and 4, the vibration damper 1 comprises one circular pipe member 6 and one first
The arm plate 7 and a pair of second arm plates 8, 8 are configured as a unit component.

The cylindrical member 6 is formed of a hollow steel cylinder. Both ends of the cylindrical member 6 in the longitudinal direction are provided with openings 6a that allow the interior of the cylindrical member 6 to be viewed.

The first arm plate 7 is a steel plate having a length and width, and is formed with an outer contour in which the width dimension of the base end 7a at one end in the longitudinal direction is wide and the width dimension of the tip end 7b at the other end in the longitudinal direction is narrow.

In the illustrated example, the outer contour of the first arm plate 7 is formed in an egg shape whose width gradually narrows from the base end 7a to the tip end 7b.

A first through hole 9 is formed in the base end 7a of the first arm plate 7, concentric with the center of the circular tubular member 6, and through which the circular tubular member 6 passes. The outer contour of the base end 7a of the first arm plate 7 is formed to include an arc portion that is concentric with the center C1 of the first through hole 9 and has an outer diameter larger than the inner diameter of the first through hole 9.

A first pin hole 11 through which a first pin 10 (described later) is inserted is formed in the tip end portion 7b of the first arm plate 7. The outer contour of the tip end portion 7b of the first arm plate 7 is
The first pin hole 11 is formed to include an arc portion concentric with the center C2 of the first pin hole 11 and having an outer diameter larger than the inner diameter of the first pin hole 11.

Therefore, in the longitudinal direction from the base end 7a where the first through hole 9 is formed to the tip end 7b where the first pin hole 11 is formed, the first arm plate 7 is formed wide around the first through hole 9 and narrow around the first pin hole 11.

Furthermore, the first arm plate 7 has a center C1 of the first through hole 9 and a center C of the first pin hole 11.
2. The first arm plate 7 is formed symmetrically with respect to the axis P1 of the first arm plate 7 connecting the first arm plate 7 and the second arm plate 7.

The second arm plate 8, like the first arm plate 7, is a steel plate having a length and width, and is formed with an outer contour in which the width dimension of the base end 8a, which is at one end in the longitudinal direction, is wide and the width dimension of the tip end 8b, which is at the other end in the longitudinal direction, is narrow.

In the illustrated example, the outer contour of the second arm plate 8 is formed in an egg shape whose width gradually narrows from the base end 8a to the tip end 8b.

A second through hole 12 is formed in the base end 8a of the second arm plate 8, concentric with the center of the circular tubular member 6, and through which the circular tubular member 6 passes. The outer contour of the base end 8a of the second arm plate 8 is formed to include an arc portion that is concentric with the center C3 of the second through hole 12 and has an outer diameter larger than the inner diameter of the second through hole 12.

A second pin hole 14 through which a second pin 13 (described later) is inserted is formed in the tip 8b of the second arm plate 8. The outer contour of the tip 8b of the second arm plate 8 is
The second pin hole 14 is formed to include an arcuate portion concentric with the center C4 of the second pin hole 14 and having an outer diameter larger than the inner diameter of the second pin hole 14.

Therefore, in the longitudinal direction from the base end 8a where the second through hole 12 is formed to the tip end 8b where the second pin hole 14 is formed, the second arm plate 8 is formed wide around the second through hole 12 and narrow around the second pin hole 14.

Furthermore, the second arm plate 8 is formed symmetrically with respect to an axis P2 of the second arm plate 8 that connects the center C3 of the second through hole 12 and the center C4 of the second pin hole 14.

The pair of second arm plates 8, 8 are formed identically from the same material and with the same dimensions.
Furthermore, although it is desirable that the first arm plate 7 and the second arm plate 8 be formed to have the same external shape except for the plate thickness, they do not necessarily have to be the same.

Regarding the relationship between the first arm plate 7, the second arm plate 8, and the circular tubular member 6, the plate thickness of the first arm plate 7 is thicker than the plate thickness of the second arm plate 8, and the plate thickness of the second arm plate 8 is thicker than the wall thickness of the circular tubular member 6. The plate thickness of the first arm plate 7 is
It is preferable that the thickness is twice the thickness of the second arm plate 8 .

The cylindrical member 6 is inserted into the second through-hole 12 of the second arm plate 8 in the longitudinal direction.
The first through-hole 9 of the first arm plate 7 and the second through-hole 12 of the other second arm plate 8 are passed through, and the first arm plate 7 and the second arm plate 8, 8 are provided with the first arm plate 7 and the second arm plate 8, 8.

The first arm plate 7 is positioned between the pair of second arm plates 8, 8. The first arm plate 7 is disposed in the central portion of the cylindrical member 6 in the longitudinal direction.

The pair of second arm plates 8, 8 are respectively arranged on both sides of the first arm plate 7 at both end portions in the longitudinal direction of the circular tubular member 6.

The first arm plate 7 and one of the second arm plates 8, and the first arm plate 7 and the other of the second arm plates 8 are disposed at equal distances L in the longitudinal direction of the cylindrical member 6 (see FIG. 3).
reference).

The longitudinal ends of the circular pipe member 6, i.e., pipe ends 6b, protrude from the second through holes 12, 12 of the pair of second arm plates 8, 8 on both sides.

The first arm plate 7 and the pair of second arm plates 8, 8 each have a first through hole 9
The entire circumference of the second through-hole 12 and the entire circumference of the second through-hole 12 are integrally joined and fixed to the cylindrical member 6 by fillet welding.

As described above, the vibration damper 1 is configured as a unitized component by joining and fixing the first arm plate 7 and the pair of second arm plates 8, 8 to the circular pipe member 6.

The vibration damper 1 has an external shape in which the first arm plate 7 and the second arm plate 8 are formed in a bent shape around the circular tubular member 6, so that they are not arranged in a straight line or overlapped at the same position.

That is, the vibration damper 1 is configured such that the first arm plate 7 and the second arm plate 8 are bent relative to each other via the circular pipe member 6 .

Specifically, the first arm plate 7 is oriented relative to the cylindrical member 6 so that the axis P1 of the first arm plate 7 and the axis P2 of the second arm plate 8 intersect with each other.
and the second arm plate 8 are joined and fixed together.

The pair of second arm plates 8, 8 are attached to the cylindrical member 6 in such a manner that they are parallel to each other and overlap in the same direction (not twisted) when viewed in the longitudinal direction of the cylindrical member 6.

The vibration damper 1 configured as described above is provided inside the above-mentioned beam-column structure 5. An H-shaped steel brace 15 is provided on the upper beam 3, which is one of the upper and lower beams that make up the beam-column structure 5. The shape and material of the brace 15 are not limited to those made of H-shaped steel.

The brace 15 has one longitudinal end, i.e., a beam-side joint end 15x, which is joined and fixed to the middle of the longitudinal direction (horizontal direction) of the upper beam 3, which is spaced a distance from the column-beam joint 4.

The first arm plate 7 of the vibration damper 1 is connected to the other longitudinal end of the brace 15, which is the column-side joint end 15y.

Specifically, the column-side joint end 15 y of the brace 15 is rotatably connected to the first arm plate 7 via a first pin 10 inserted into a first pin hole 11 .

A connecting bracket unit 16 is provided on the left column 2 , which is one of the left and right columns that make up the column-beam frame 5 , in order to connect the brace 15 via the vibration damper 1 .

The joining bracket unit 16 is joined and fixed to the left column 2 at a vertical midpoint, away from the column-beam joint 4 .

The second arm plates 8, 8 of the vibration damper 1 are connected to this joining bracket unit 16.

Specifically, the joining bracket unit 16 is rotatably connected to the second arm plates 8, 8 via second pins 13, 13 inserted into second pin holes 14, 14 of the second arm plates 8, 8.

As described above, the brace 15 has a beam-side joint end 15x at one end in the longitudinal direction joined and fixed to the upper beam 3, and a column-side joint end 15y at the other end in the longitudinal direction connected to the first arm plate 7 via the first pin insertion hole 17.

As shown in FIGS. 5 to 7, the beam-side joint end 15x of the brace 15 is provided with a steel joint plate 18 welded to the brace end face formed flat along the underside of the upper beam 3, and a steel joint plate 18 welded to the brace end face formed flat along the underside of the upper beam 3.
15a of the brace 15, and are welded to both sides of the brace 15, and are joined to the joining plate 1
8 and a pair of steel reinforcing ribs 19 welded to each other.

The brace 15 is formed by connecting the connecting plate 18 to the bottom of the upper beam 3 with bolts 20.
The sensor is attached and fixed with high rigidity.

A pair of steel spacers 21 are provided on both sides of the web 15a at the column-side joint end 15y of the brace 15, and a pair of steel connecting plates 22 are provided on each spacer 21 and protrude outward from the brace 15.
2 is joined to the web 15a with bolts and nuts 23 via spacers 21, providing high rigidity.

The connecting plates 22 are formed with first pin insertion holes 17. The brace 15 and the first arm plate 7 are connected to each other by a pair of connecting plates 22, with the tip end 7b of the first arm plate 7 being inserted between the pair of connecting plates 22.
is inserted, the first pin hole 11 is aligned with the pair of first pin insertion holes 17, and the first pin 10 is inserted through the first pin hole 11 and the first pin insertion hole 17, whereby the pins are connected so as to be freely rotatable relative to each other.

As shown in Figures 1 to 3, the joining bracket unit 16 for joining the column-side joint end 15y of the brace 15 to the left column 2 is mainly composed of a pair of joining plates 24, 24 joined to the left column 2, a base plate 25 joined to both of the pair of joining plates 24 and arranged facing the left column 2 within the column-beam frame 5, and brace connecting plates 26, 26 joined to the base plate 25 in accordance with the number of second arm plates 8, 8 and for connecting to the column-side joint end 15y of the brace 15 via the vibration control damper 1.

The pair of joining plates 24, 24 are arranged to sandwich the left column 2, which has a square cross section, from both sides.
The joining plates 24, 24 are respectively joined to a pair of column side surfaces on both sides in the column width direction.
is formed from a rectangular steel plate material.

The plate surfaces of these joining plates 24, 24 are overlapped on the side surfaces of the columns, and one edge (hereinafter referred to as the base plate side edge) 24 of the four edges faces the column-beam frame 5.
Except for b, the three edges 24a are joined to the side surface of the column by fillet welding.

The rear surface of a base plate 25 is welded to the base plate side edges 24b of the pair of joining plates 24, 24. The base plate 25 is formed from a rectangular steel plate material.

The base plate 25 is fixed to the base plate side edge 2 of both of the pair of joining plates 24, 24.
4b, 24b, the base plate 25 is disposed inside the beam-column frame 5 so as to face the left column 2. In other words, the base plate 25 is not joined to the left column 2.

The base plate side edge 24b of the joint plate 24 is set at a position that protrudes from the left column 2 into the column-beam frame 5. In this case, the base plate 25 is positioned with a gap between it and the left column 2.

Alternatively, the base plate side edge 24b is set at a position flush with the left column 2 without protruding from the left column 2. In this case, the base plate 25 is disposed in contact with the left column 2.

The base plate 25 and the joining plate 24 have approximately the same vertical dimension in the column height direction. The horizontal dimension of the base plate 25 in the column width direction is approximately the same as the horizontal dimension of the pair of joining plates 24 on both sides of the left column 2.
, 24 are joined together, the dimension is larger than the dimension in the column width direction of those plates. The horizontal dimension S of the joining plate 24 along the column side surface is set to be at least half the width dimension of the column side surface of the left column 2.

The horizontal dimension S of the joining plate 24 is large in order to increase the amount of welding when the axial force of the brace 15 is large and the load to be borne is large, but when the load to be borne is small, the amount of welding is small and so it can be made small.

Considering the four welding points on the three edges 24a welded to the column side surface of the left column 2 and the four edges of the base plate side edge 24b, it is desirable that the joining plate 24 be square in shape with the horizontal dimension S and vertical dimensions all equal, and welded to the column side surface and base plate 25.

On the surface of the base plate 25 opposite the back surface joined to the joining plate 24, multiple brace connecting plates 26, 26, in the illustrated example two, are welded at intervals to match the arrangement of the two second arm plates 8, 8 joined to the circular tubular member 6.

Each brace connection plate 26, 26 is formed from a substantially rectangular steel plate material, and has a vertical dimension that is substantially the same as that of the joining plate 24. However, the shape and vertical dimension of each brace connection plate 26, 26 are not limited to this.

The brace connecting plate 26 has one of its four edges joined to the base plate 25 by fillet welding, and is protruded from the base plate 25 into the column-beam frame 5 toward the second arm plate 8.

The base plate 25 has a pair of first joint points with a pair of joint plates 24, 24 on both the front and back, and a pair of second joint points with a pair of brace connecting plates 26, 26, and these second joint points are set between the first joint points so as not to exceed the distance between the pair of joint plates 24, 24, which is equivalent to the column width of the left column 2.

A second pin insertion hole 30 is formed through the brace connecting plate 26 .
The pair of brace connecting plates 26, 26 and the pair of second arm plates 8, 8 are stacked facing each other, the second pin holes 14 and the second pin insertion holes 30 are aligned, and the second pins 13 are inserted through the second pin holes 14 and the second pin insertion holes 30, so that the pair of second arm plates 8, 8 are pin-connected to each of the brace connecting plates 26, 26 so as to be freely rotatable relative to each other.

That is, in this embodiment, in the structure in which the column-side joint end 15y of the brace 15 is attached to the left column 2, the second arm plates 8, 8 of the vibration damper 1 are components that connect the brace connecting plates 26, 26 and the brace 15, and the second arm plates 8, 8 and the brace connecting plates 26, 26 are rotatably connected by the second pins 13 provided in the second pin holes 14 and the second pin insertion holes 30.

Reinforcing rib members 28 made of steel plate material are provided and joined to both the brace connecting plates 26, 26 and the base plate 25.

The reinforcing rib material 28 is provided at the corners of the brace connecting plate 26 and the base plate 25 so as to connect them together in order to reinforce the joint between the brace connecting plate 26 and the base plate 25 .

Furthermore, the reinforcing rib material 28 is disposed near the second pin insertion hole 30 through which the axial force from the brace 15 is input to the brace connecting plate 26. In the illustrated example, two reinforcing rib materials 28 are provided, arranged to sandwich the second pin insertion hole 30 from both sides in the column height direction.

Furthermore, as shown in Figure 3, a reinforcing metal piece 31 is provided on the back surface of the brace connecting plate 26 opposite the surface on which the reinforcing rib material 28 is provided, in order to reinforce the area around the second pin 13 that rotatably connects the brace connecting plate 26 and the second arm plate 8.

As also shown in Figure 9, the reinforcing hardware 31 has one end 31a located on the opposite side of the brace connecting plate 26 across the second arm plate 8 in the insertion direction of the second pin 13, and the other end 31b joined to the brace connecting plate 26 at a position away from the second pin 13.

An additional pin insertion hole 31c is formed at one end 31a of the reinforcing metal piece 31, through which the second pin 13 is rotatably inserted.

In the illustrated example, the reinforcing metal fitting 31 is formed in an integral L-shape from one end 31a to the other end 31b when viewed from the column height direction.

However, it is of course possible for the reinforcing hardware 31 to be constructed as an assembly of separate parts, with one end 31a being a bearing part and the other end 31b being a spacer that fills the gap between the bearing part and the brace connecting plate 26.

The other end 31b of the reinforcing metal fitting 31 is connected to the high-strength bolt 29 and nut 3 at two positions, top and bottom, in the column height direction.
2, it is joined and fixed to the brace connecting plate 26.

As a result, the second pin 13 is supported at both ends by the reinforcing hardware 31 and the brace connecting plate 26 by both the additional pin insertion hole 31c of the reinforcing hardware 31 and the second pin insertion hole 30 of the brace connecting plate 26.

Both ends of the second pin 13 are held to the brace connecting plate 26 and one end 31 a of the reinforcing metal piece 31 by bolts 34 via washers 33 .

Next, the operation of the brace-to-column joining structure according to this embodiment will be described. When the vibration damper 1 used in this embodiment is installed in a beam-column frame 5, the brace 15 is first joined and fixed to a predetermined location on the upper beam 3.

Next, the connecting plate 22 of the brace 15 and the first arm plate 7 of the vibration damper 1 are connected to each other by inserting the first pin 10 into the first pin insertion hole 17 and the first pin hole 11, respectively, so as to be freely rotatable.

Next, the joining bracket unit 16 is installed at a predetermined position on the left column 2. At this time, first, a pair of joining plates 24, 24 are welded to the left column 2, and then these joining plates 2
A base plate 25 is welded to both the plates 4 and 24 .

Subsequently, the brace connection plates 26, 26 are welded to the base plate 25, and the reinforcing rib members 28, 28 are welded to both the brace connection plates 26, 26 and the base plate 25.

In this case, the joining bracket unit 16 may be assembled in advance in a factory or the like using a pair of joining plates 24, 24, which are some of its constituent parts, and this assembly may then be installed on the left column 2 on site.

Finally, the other end 31b of the reinforcing metal 31 is temporarily fixed to the brace connecting plate 26, and the second arm plate 8 of the vibration damper 1 is fixed to the brace connecting plate 26 and the reinforcing metal 31 through the second pin insertion hole 30, the additional pin insertion hole 31c, and the second pin hole 14.
The second pin 13 is inserted through the reinforcing metal fitting 31 to connect the reinforcing metal fitting 31 to the brace connecting plate 26.

When an external vibration force such as an earthquake acts on the column-beam frame 5, repeated deformation (strain) occurs in the column-beam frame 5. When deformation occurs in the column-beam frame 5, the force associated with this deformation is input from the column 2 through the connecting bracket unit 16 to the brace 15 connected to the beam 3 and the vibration control damper 1.

In the vibration damper 1, if the input from the first arm plate 7 and the second arm plate 8 acts in the circumferential direction of the circular tubular member 6 (the first pin hole 11 and the second pin hole 14 move toward and away from each other), the torsional moment generated between the first arm plate 7 and the second arm plate 8 causes the circular tubular member 6 to deform and absorb energy, thereby damping the external vibration force.

Furthermore, if the input from the first arm plate 7 and the second arm plate 8 is a shear force acting in the horizontal direction, the vertical direction, or the radial direction of the circular pipe member 6 from an oblique direction, the circular pipe member 6 will deform due to the shear force, absorbing energy and damping the external vibration force.

In this way, the vibration damper 1 absorbs energy from both torsional moments and shear forces, and efficiently exerts vibration damping action.

When the vibration damper 1 operates in this manner, an axial force acts on the connecting bracket unit 16 along the length of the brace 15 .

In the brace-to-column mounting structure according to this embodiment, the base plate 25 is arranged facing the column 2 without being joined to the column 2. This prevents the axial force of the brace 15 from causing out-of-plane deformation in the column 2, which could lead to buckling in the column 2, unlike the background art in which connecting fittings are joined to structural members by surface bonding.

Therefore, the brace 15 can fully exert its strength, and the vibration damper 1 can function effectively.

When the base plate 25 is positioned with a gap between it and the column 2, this gap allows the base plate 25, which transmits the axial force of the brace 15, to be structurally insulated from the column 2, and out-of-plane deformation of the column 2 can be reliably prevented whether the brace 15 is in tension or compression.

When the base plate 25 is placed in contact with the column 2, the brace 15 is in tension in the same manner as when there is a gap, and when it is in compression, an axial force acts on the column 2.

However, when the brace 15 is compressed, the axial force acting on the column 2 is absorbed by the base plate 25 due to the presence of the base plate 25, thereby suppressing out-of-plane deformation of the column 2 and allowing the vibration damper 1 to absorb energy efficiently.

The base plate 25 has a pair of first joint points with a pair of joining plates 24, 24 and a pair of second joint points with a pair of brace connecting plates 26, 26 on the front and back, respectively, and the second joint points are located between the pair of first joint points, so that the axial force of the brace 15 transmitted from the brace connecting plate 26 can be sufficiently transmitted to the joining plate 24 through the base plate 25 and supported.

The reinforcing rib material 28 is provided by joining it to both the base plate 25 and the brace connection plate 26, so that the reinforcing rib material 28 can suppress deformation of both the base plate 25 and the brace connection plate 26, and can efficiently transmit the axial force of the brace 15.
The vibration damper 1 can efficiently absorb energy.

Since the brace connecting plate 26 and the brace 15 are connected via the vibration damper 1, which attenuates external vibration forces with torsional moment, the axial force energy of the brace 15 transmitted between the brace 15 and the brace connecting plate 26 can be effectively absorbed by the vibration damper 1, reducing the load on the column 2 and preventing destruction of the column-beam structure 5.

The second pin 13, which rotatably connects the brace connecting plate 26 and the second arm plate 8 of the vibration damper 1, is supported at both ends of the second arm plate 8 by the brace connecting plate 26 and the reinforcing metal fittings 31, so that the second pin 13 can be appropriately supported and at the same time,
The second pin 13 can be provided with good precision.

Figure 8 shows the case where the second pin 13 of the second arm plate 8 is supported only by the brace connection plate 26, and Figure 9 shows the case where the second pin 13 is supported at both ends by the brace connection plate 26 and reinforcing hardware 31, as described in this embodiment.

In the case of FIG. 8, the second pin 13 is tilted by the movement of the second arm plate 8, and the second pin 13 is inserted into the second insertion hole 3.
It is difficult to stably bear the shear force because the second pin 13 may contact unevenly with the 0 or the second pin 13 itself may bend.

In contrast to this, in the case of FIG. 9, the shear force can be stably received, and further, the second pin 1
The cross-sectional area of the second pin 13 can be reduced to make the structure more compact. When attaching the second pin 13, the second pin 13 is assembled into the second insertion hole 30 or the like while the high-strength bolt 29 is loosened, and then the high-strength bolt 29 is tightened, thereby enabling the second pin 13 to be installed with high precision.

Since the reinforcing rib material 28 is positioned near the second pin insertion hole 30 of the brace connecting plate 26, deformation of the brace connecting plate 26 and the base plate 25 due to the axial force of the brace 15 transmitted via the second pin 13 can be suppressed, and the entire joining bracket unit 16 can appropriately absorb the axial force of the brace 15.

10 shows a modified example of the brace-to-column mounting structure according to the present invention. In this modification, a beam-column frame 5 is constructed in a rectangular shape by joining a pair of upper and lower beams 3, 3a to a pair of left and right columns 2, 2a, and the beam-side joint end 15x of the brace 15 is set to either the column-beam joint 4 at the upper internal corner or the column-beam joint 4a at the lower internal corner of any pair of opposing beam-column frames 5, and the column-side joint end 15y of the brace 15 is set to the other of the column-beam joint 4 at the upper internal corner or the column-beam joint 4a at the lower internal corner.

In other words, this is the case where one diagonal brace 15 is provided inside the rectangular beam-column frame 5 across the beam-column joints 4, 4a.

In the illustrated example, the beam-side joint end 15x of the brace 15 is joined and fixed to the column-beam joint 4 at the upper inside corner, and the column-side joint end 15y is joined and fixed via a vibration damper 1 to a joining bracket unit 16 provided near the column-beam joint 4a at the lower inside corner, the brace 15 is rotatably pin-connected to the first arm plate 7 via a first pin 10, and the joining bracket unit 16 is rotatably pin-connected to the second arm plates 8, 8 via a second pin 13.

Unlike the above embodiment in which the brace 15 and the joining bracket unit 16 are provided at a position away from the column-beam joint 4, this modified example installs the brace 15 etc. at or near the column-beam joint 4, 4a, and of course even this modified example achieves the same effects as the above embodiment.

1 Vibration damper 2 Pillar (left pillar)
3 Beam (upper beam)
5 Column-beam frame 8 Second arm plate 13 Second pin 14 Second pin hole 15 Brace 15y Column-side joint end of brace 24 Joint plate 25 Base plate 26 Brace connecting plate 28 Reinforcement rib material 30 Second pin insertion hole 31 Reinforcement metal fitting 31a One end 31b Other end 31c Additional pin insertion hole

Claims (6)

A structure in which the column-side joint end of a brace provided in a frame constructed by joining a column and a beam is attached to the column,
A pair of joining plates are provided on the column and joined to a pair of column surfaces on both sides in the column width direction,
a base plate joined to both of the pair of joining plates and disposed within the frame so as to face the column;
a brace connection plate joined to the base plate and connected to the column-side joint end of the brace,
a base plate disposed in contact with the column and not joined to the column; The brace-to-column mounting structure described in claim 1, characterized in that the base plate has a pair of first joint points with the pair of connecting plates and a pair of second joint points with the brace connecting plate on the front and back sides, and the second joint points are located between the pair of first joint points. A brace-to-column mounting structure as described in claim 1 or 2, characterized in that reinforcing rib materials are provided and joined to both the base plate and the brace connecting plate. the brace connecting plate and the brace are connected via a vibration damper that has an arm plate and attenuates external vibration forces by a torsional moment;
The brace mounting structure to a column according to any one of claims 1 to 3, characterized in that the brace connecting plate and the arm plate are rotatably connected via a pin inserted into a pin hole connecting them. The brace-to-column mounting structure described in claim 4, characterized in that the brace connection plate has one end located on the opposite side of the arm plate from the brace connection plate in the pin insertion direction and having an additional pin hole through which the pin is rotatably inserted, and the other end joined to the brace connection plate, and reinforcing hardware is provided on both sides of the arm plate to support both ends of the pin together with the brace connection plate. A brace-to-column mounting structure as described in any one of claims 3 to 5, characterized in that the reinforcing rib material is positioned near the pin hole of the brace connecting plate.