JP2001140341A - Viscoelastic damper and earthquake-resistant reinforcing structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a viscoelastic damper and an earthquake-resistant reinforcing structure with the viscoelastic damper, enhancing easy and inexpensive earthquake-resistant reinforcement of existing and new buildings. SOLUTION: This viscoelastic damper 3 comprises a triangular displacement plate 5 fixed to a column 1 constituting a column-beam mounting frame and protruded thereon, a triangular displacement plate 6 fixed to a beam 2 and protruded on the side of the displacement plate 5, and a viscoelastic body 7 filled between the displacement plates 5, 6. The displacement plates 5, 6 are formed by connecting a plurality of divided plates 5a, 6a to each other. The viscoelastic damper 3 is mounted on a connection of the column-beam mounting frame.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a viscoelastic damper and a seismic reinforcement structure using the viscoelastic damper.
It can be easily applied not only to seismic reinforcement of existing buildings but also to new buildings.

[0002]

2. Description of the Related Art In recent years, a method of attaching a viscoelastic damper using a viscoelastic body to a column / beam frame has been used as a seismic reinforcement of a building. By the way, since the conventional viscoelastic damper is mounted in a column / beam frame structure in a brace type or a wall type, a reaction force generated from the damper acts on the frame members such as columns and beams, and acts locally.

[0003] Therefore, it is necessary to locally reinforce the portion of the column / beam frame that engages with the damper, or to reinforce the portion other than the damper by inserting a steel frame inside the column / beam frame. There have been problems such as a large increase in reinforcement cost and a great increase in the number of construction days. In addition, since additional braces and walls have relatively high strength and rigidity, the surrounding columns and beam frames may collapse first.In addition, depending on the type of damper, the brace or wall may become an obstacle and the floor plan may be reduced. There were also problems such as the degree of freedom being greatly restricted, and the usability of the building changing and the livability lowering.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has a visco-elastic damper and an visco-elastic damper which make it possible to reinforce an existing building and a newly-built building very easily and at low cost. It is an object to provide a structure.

[0005]

According to a first aspect of the present invention, there is provided a viscoelastic damper according to the present invention, wherein the viscoelastic damper is fixed to one of columns or beams forming a column / beam frame. A triangular displacement plate that is protruded, a triangular displacement plate that is fixed to the other of the columns or beams, and that is protruded to the side of the displacement plate, and a displacement plate integrally formed between these displacement plates. And a viscoelastic body to be filled.

According to a second aspect, in the viscoelastic damper according to the first aspect, a plurality of ribs are protruded from an outer surface of the displacement plate. According to a third aspect, in the viscoelastic damper of the first or second aspect, the displacement plate is formed by connecting a plurality of divided plates to each other. The seismic retrofit structure according to the present invention is described in claims 1 and 2.
Alternatively, the viscoelastic damper of No. 3 is attached to the connection part of the column / beam frame.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 of the Invention 1 to 4
1 shows an embodiment of the present invention. In the figure, a joint (joint) between a pillar 1 and a beam 2 constituting a pillar / beam frame of a building is shown.
The viscoelastic damper 3 is attached to the rim. The viscoelastic damper 3 is covered with a finishing material (not shown) such as an ALC plate as necessary.

The column 1 and the beam 2 are both constructed of reinforced concrete or steel frame reinforced concrete, steel frame, wooden structure or the like, and both form a so-called ramen-structured column / beam frame. Here, the ramen structure may be not only a pure ramen structure but also a ramen structure with walls.

Two visco-elastic dampers 3 are symmetrically attached to the lower two laterally opposed ports, and an opening 4 such as a window is provided between the left and right visco-elastic dampers 3. Space is provided. The viscoelastic damper 3
Need not necessarily be arranged symmetrically as shown in the figure, and may be attached, for example, vertically and diagonally, or at one or all four ports.

Further, the viscoelastic damper 3 is fixed to the upper surface of the beam 2 and the displacement plate 5 which is fixedly protruded from the side surface of the column 1, and is substantially similar to the displacement plate 5 beside the displacement plate 5. It is composed of a displacement plate 6 projecting in parallel and a viscoelastic body 7 filled in a gap between the two displacement plates 5 and 6 in a state of being integrated with the displacement plates 5 and 6. . Each of the displacement plates 5 and 6 is formed of a plurality of divided plates 5a and 6a made of a steel plate as shown in FIGS. 3A and 3B, for example. By being connected to each other, the displacement plates 5 and 6 are formed in a triangular plate shape having substantially the same size.

In this case, ribs 5b and 6b serving as reinforcement and connecting portions are respectively protruded around the divided plates 5a and 6a, and the ribs 5b and the ribs 6b are connected to each other by a plurality of high-strength bolts 8. The split plate 5a
The dividing plates 6a are integrally connected to each other. Note that the split plates may be connected by welding. In addition, the size of the displacement plates 5 and 6 is determined according to the magnitude of the seismic force expected to be received by the column / beam frame. The size and shape of the split plates 5a and 6a, the number of split plates, and the like are appropriately determined in consideration of the shape and size of the split plate 4.

As the viscoelastic body 7, various materials prepared from a polymer material such as an acrylic, silicon, urethane, rubber, or diene material are used. Also,
As with the displacement plates 5 and 6, the viscoelastic body 7 is prepared according to the magnitude of the seismic force expected to be received by the column / beam frame,
The filling amount (the number of laminations) and the like are appropriately determined, and the thickness of the viscoelastic damper 7 is changed stepwise as necessary in accordance with the shear strain generated according to the turning radius from the connection portion. I have.

A viscoelastic body 7 is provided in the gap between the displacement plates 5 and 6.
As a method of filling, for example, a sheet-like material of the viscoelastic body 7 is attached to the gap between the displacement plates 5 and 6 in several layers, or a fluid-like material is formed between the displacement plates 5 and 6. It is filled by being poured into the gap or the like. The viscoelastic body 7 filled between the displacement plates 5 and 6 has a very large degree of freedom in structure and shape, and can easily produce viscoelastic dampers in various forms.

Further, the viscoelastic body 7 can effectively absorb seismic energy from a small deformation to a large deformation, and can control not only an earthquake load but also a wind load. Viscoelastic damper 3 thus formed
One end 5c of the displacement plate 5 (hereinafter referred to as “the opposite side portion 5c”) is attached to the side surface of the
Are fixed to the upper surface of the beam 2 by the fittings 10, respectively, so that the lower end 6 c is attached to the connection part of the column / beam frame.

The mounting bracket 9 includes a fixing portion 9a fixed to the side surface of the column 1 along the axial direction of the column 1 and the fixing portion 9a.
And a mounting portion 9b to which the opposite side 5c of the displacement plate 5 is connected is formed in a substantially T-shaped cross section. Further, the mounting bracket 10 includes a fixed portion 10 a fixed to the upper surface of the beam 2 along the axial direction of the beam 2 and a fixing portion 10 a.
and a mounting portion 10b protruding from substantially the center of a and connected to the bottom portion 6c of the displacement plate 6, and has a substantially T-shaped cross section.

Further, a plurality of anchor holes 11 are formed at predetermined intervals in the axial direction on both sides of the fixing portions 9a and 10a,
The mounting portions 9b and 10b have mounting holes 12 and 1 respectively.
3 are formed at predetermined intervals in the axial direction.
Or, 13 is a long hole elongated in the direction perpendicular to the axis of the mounting brackets 9 and 10. As the fittings 9 and 10, for example, cut-tee steel formed by cutting an H-section steel into two at a web portion or the like is used.

The mounting brackets 9 and 10 thus formed are respectively attached to the side surface of the column 1 and the upper surface of the beam 2 along their axial directions, and one end of the mounting metal 9 and 10 is connected to the column 1 and the beam 2. At the corners a, they are attached to the side surface of the column 1 and the top surface of the beam 2 by a plurality of anchor bolts 14 that penetrate the anchor holes 11 respectively.

The opposite side 5c of the displacement plate 5 is
Attached to the side surface of the mounting portion 9b and the mounting portion 9b
Are connected to the mounting portion 9b by a plurality of connection bolts 15 passing through the mounting holes 12. Further, the bottom portion 6c of the displacement plate 6 is attached to the side surface of the mounting portion 10b of the mounting bracket 10, and is connected to the mounting portion 10b by a plurality of connection bolts 16 penetrating through the mounting hole 13 of the mounting portion 10b. . In addition, high-strength bolts are used for the connection bolts 15 and 16.

In such a configuration, the displacement plates 5 and 6 are provided at the corners of the column 1 and the beam 2 with respect to the interlayer displacement of the column / beam frame during an earthquake, for example, as shown in FIG. The viscoelastic body 7 is sheared and deformed by the rotational displacement in the opposite direction with respect to a, thereby absorbing the seismic energy,
The seismic performance of columns and beams is improved. The mounting hole 12
Or 13 is formed as a long hole (loose hole) which is long in the direction perpendicular to the axis of the mounting brackets 9 and 10, so that a slip mechanism is formed at the connecting portion between the viscoelastic damper 3 and the mounting brackets 9 and 10, thereby damping. Power can be controlled.

A large reaction force from the damper acts on the joint between the displacement plate 5 and the column 1 and the joint between the displacement plate 6 and the beam 2, but the opposite side 5c of the displacement plate 5 and the displacement plate 6 Is fixed to the column 1 and the beam 2 over a considerable length, respectively, so that a large reaction force from the damper does not act locally on the column 1 and the beam 2, but is evenly distributed. Not only is it easier to handle the reaction force than when using a brace type or wall type damper,
The burden of reaction force on the skeleton can be greatly reduced.

The shape of the viscoelastic damper 3, that is, the shapes of the displacement plates 5 and 6 (side lengths of triangles) can be arbitrarily set according to the shape and size of the opening 4 and the structurally necessary shape. Therefore, the opening 4 can be arbitrarily provided. Furthermore, in the case of a true wall structure, the viscoelastic damper 3 can be easily attached to the connection part of the column / beam frame only by external work, and even in the case of a large wall structure, the work in the room can be easily performed. Can be attached to

FIG. 4 shows another mounting example of the visco-elastic damper. FIG. 4 (a) shows two visco-elastic dampers 3 which are mounted on two opposite upper side laterally opposite ports symmetrically. Also, an example is shown in which a space for providing an opening 4 is provided between the left and right viscoelastic dampers 3. (B) shows two viscoelastic dampers 3 each having a bottom side longer than the opposite side.
The left and right sides of the two oppositely facing ports are symmetrically attached to each other, and a space for providing an opening 4 such as a window between the left and right viscous dampers 3 and above each viscoelastic damper 3 is provided. It is an example in which it is provided.

In the case of a relatively small type viscoelastic damper, both of the displacement plates 5 and 6 may be formed as a single piece. A plurality of reinforcing ribs are protrudingly provided on the outer side surfaces of the and 6. For example, as shown in FIG.
The fixing portions 17 and 18 are formed on the opposite side portion 5c and the bottom side portion 6c of the displacement plate 6, respectively, by bending the portions substantially vertically, and the fixing portions 17 and 18 are respectively formed on the side portions of the column 1 and the upper surface of the beam 2. It may be directly fixed to the part by the anchor bolt 14.

With such a configuration, it is possible to omit a fitting for attaching the viscoelastic damper 3 to the connection between the column 1 and the beam 2.

[0025]

The present invention has been described above. In particular, the viscoelastic damper has a triangular displacement plate fixedly protruding from one of the columns or beams forming the column / beam frame.
It is composed of a triangular displacement plate fixed to the other of the column or the beam and protruding from the side of the displacement plate, and a viscoelastic body filled between the displacement plates and the displacement plate integrally. So
It can be made extremely simple and compact, and can be easily fitted and installed in the connection part of the column / beam frame without strictly setting the installation position.

In addition, the viscoelastic damper is fixed to a column and a beam by connecting the opposite side of one displacement plate and the bottom of the other displacement plate to a column and a beam over a considerable length. Even if a large reaction force from the damper acts on the joint between the column and the beam, the large reaction force from the damper does not act locally on the column and the beam, but is evenly distributed and processed. As a result, not only is it easier to handle the reaction force than when conventional brace-type or wall-type dampers are used, the reaction force acting on the columns and beams can be significantly reduced, and therefore the columns and beams are locally reinforced. No need.

The shape of the viscoelastic damper, ie, the shape of the displacement plate (side length of the triangle) can be arbitrarily set according to the shape and size of the opening and the structurally necessary size. Can be arbitrarily provided. Further, since the displacement plate of the viscoelastic damper is formed by connecting a plurality of divided plates to each other, a viscoelastic damper of a required scale can be easily manufactured.

Furthermore, even if existing buildings are to be reinforced by seismic resistance, pillars and pillars can be installed without major construction work such as removing existing finishes or adding new earthquake-resistant walls.
If there is some space in the connection part of the beam frame, a viscoelastic damper is attached to this part to make it extremely existing or new, regardless of the type of structure such as reinforced concrete structure, steel reinforced concrete structure, steel frame or wooden structure. Seismic reinforcement can be performed easily and at low cost.

[Brief description of the drawings]

FIG. 1 shows a column / beam frame to which a viscoelastic damper is attached, (a) is a partial front view, and (b) is an exploded side view of the viscoelastic damper.

2 (a) is a partial longitudinal sectional view, FIG. 2 (b) is a sectional view taken along the line II in FIG. 2 (a), and FIG. FIG. 3D is a sectional view taken along a line, and FIG.

3A and 3B are exploded side views of a displacement plate, and FIG.
FIG. 3 is a partial perspective view of a viscoelastic damper.

FIGS. 4A and 4B are partial front views showing a column / beam frame to which a viscoelastic damper is attached.

FIG. 5 (a) shows a column to which a viscoelastic damper is attached.
Partial front view showing a beam frame.
(C) is a cross-sectional view taken along the line ii in (a),
(D) is a partially enlarged view of (c).

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Column 2 Beam 3 Viscoelastic damper 4 Opening 5 Displacement plate 5a Dividing plate 5b Rib 5c Opposite side (one side end) 6 Displacement plate 6a Dividing plate 6b rib 6c Opposite side (one side end) 7 Viscoelastic body 8 High-strength bolt 9 Mounting bracket 9a Fixed section 9b Mounting section 10 Mounting bracket 10a Fixed section 10b Mounting section 11 Anchor hole 12 Mounting hole 13 Mounting hole 14 Anchor bolt 15 Connection bolt 16 Connection bolt 17 Fixed section 18 Fixed section

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification FI FI Theme Court ゛ (Reference) F16F 15/02 F16F 15/02 F (72) Inventor Chisato Nojima 3-chome, Kitakuhoji-cho, Chuo-ku, Osaka-shi, Osaka No. 6 No. 1 Konoike Gumi Co., Ltd. (72) Inventor Yoshiyuki Kuboshima 6-5-19 Minamishinagawa, Shinagawa-ku, Tokyo Sanwa Tekki Co., Ltd. F-term (reference) 2E002 FB08 FB22 HA02 HA04 HB01 JA02 JB01 MA11 2E176 AA00 BB29 3J048 AB01 BD08 BE12 DA10 EA38 3J066 AA26 BB04 BC05 CA05

Claims (4)

[Claims] 1. A triangular displacement plate fixed to and protruded from one of columns or beams forming a column / beam frame, and a triangular displacement plate fixed to the other of the columns or beams and projecting laterally from the displacement plate. A viscoelastic damper comprising: a triangular displacement plate provided; and a viscoelastic body interposed between the displacement plates and the displacement plate. 2. The viscoelastic damper according to claim 1, wherein the displacement plate has a plurality of ribs on an outer surface thereof. 3. The viscoelastic damper according to claim 1, wherein the displacement plate is formed by connecting a plurality of divided plates to each other. 4. A seismic strengthening structure comprising the viscoelastic damper according to claim 1, 2 or 3 attached to a connection of a column / beam frame.