JP2003321944A - Aseismic damper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an aseismic damper absorbing vibration energy of all directions in a horizontal plane, when it is positioned in comparatively a few places. <P>SOLUTION: The aseismic damper comprises a damper 12, an upper supporting member 11 and a lower supporting member 13 fixed to the upper part and the lower part of the damper respectively. The upper supporting member and the lower supporting member are filled with concrete in their steel pipes of a rectangular cross section. The damper in a panel shape includes a steel plate 12a having a low yield point, and it is fixed to at least two right- angled surfaces of each of the steel pipes of rectangular cross section. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration control member provided in a column beam structure.

[0002]

2. Description of the Related Art A vibration control structure in which a stud type vibration control member is incorporated in a frame composed of columns and beams is conventionally known. For example, a vibration control member 50 as shown in FIG. 5 is used. Has been done. Here, FIG. 5A is a front view of the vibration damping member 50,
FIG. 5B is a cross-sectional view taken along the line Vb-Vb, and FIG. 5C is a plan view showing the arrangement of columns and beams of a vibration control structure incorporating the vibration control member 50. The vibration control member 50 in FIG. 5 is formed by a reinforced concrete support column 53 provided so as to extend upward from the lower beam 58B, and a bolt or screw rod rebar and a nut 52c placed on the upper end surface of the support column 53. It is composed of a fixed damping damper 52 and a reinforced concrete strut 51 provided so as to extend from the damping damper 52 to the upper beam 58A. In addition, the seismic damper 52 includes the base plate 5 above and below the low yield point steel plate 52b.
2a, 52d, flanges 52e on the left and right, and is configured to be easily plastically deformed in the in-plane direction of the low yield point steel plate 52b, that is, in the direction of arrow D, and difficult to plastically deform in a direction orthogonal to the plane. There is.

[0003]

In the damping member 50 constructed as described above, when the structure vibrates due to an earthquake to cause interlayer deformation and a shearing force is applied, the low yield point steel plate 52b becomes It is plastically deformed along the surface direction and absorbs vibration energy. Therefore, in the structure in which the columns 59 and the beams 58 are arranged as shown in FIG. 5C, the directions of the low yield point steel plates 52b are orthogonal to each other in order to absorb the vibration energy in all directions in the horizontal plane. Since it is necessary to provide the damping member 50, it is necessary to install the damping member 50 on the beam in the two directions of the x direction and the y direction, which doubles the mounting time and increases the construction cost. There is.

The present invention has been made in order to solve the above problems, and the problem is that if it is installed in a relatively small number of places, it is possible to absorb vibration energy in all directions in a horizontal plane. It is to provide a damping member.

[0005]

According to the present invention, there is provided a damping member provided in a column beam frame, which includes a damper, and an upper support member and a lower support member fixed above and below the damper, respectively. Or a damper and an upper or lower support member fixed to one of the upper and lower sides of the damper, the upper support member and the lower support member being filled with concrete in a steel pipe having a rectangular cross section. The vibration damping member is characterized in that the damper is a panel-shaped damper including a low yield point steel plate and is fixed to at least two orthogonal surfaces of the steel pipe having the rectangular cross section. It Further, according to the present invention, a vibration damping member provided in a column beam frame is provided with a damper and an upper support member and a lower support member fixed above and below the damper, respectively, or An upper or lower support member fixed to either one of the upper and lower sides of the damper, wherein the upper support member and the lower support member are rectangular steel pipes filled with concrete. Is a panel-shaped damper formed by sandwiching one material selected from a viscoelastic body, a rubber-like elastoplastic body, and a viscous body between steel plates, and is fixed to at least two orthogonal surfaces of the steel pipe having the rectangular cross section. There is provided a vibration damping member characterized by being a thing.

In the vibration damping member of the present invention, the panel-shaped damper is fixed to at least two orthogonal surfaces of a steel pipe having a rectangular cross section. Therefore, if this vibration damping member is provided between upper and lower beams at a predetermined position of the structure, No matter which direction the vibration energy acts on the horizontal plane, the panel-shaped damper crosses it 2
The low yield point steel plate can be plastically deformed, or the steel plate can be displaced while receiving the resistance of the viscoelastic body to absorb vibration energy. Further, since the vibration control member includes a damper including a steel plate and a steel pipe, the panel-shaped damper can be fixed by means such as welding or bolts from the outside of the upper and lower steel pipes.
It eliminates the need for complicated installation work at construction sites, such as the conventional seismic damper, and allows the work to proceed efficiently.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The panel-shaped damper including the low yield point steel plate is composed of a single low yield point steel plate formed in a flat plate shape, or a normal steel is provided outside the flat plate low yield point steel plate. It is also possible to provide a vertical rib made of and a horizontal rib made of ordinary steel on the inside. As described above, when a panel-shaped damper is constructed from a single low-yield-point steel plate, there is no member that prevents out-of-plane buckling of the panel, so out-of-plane buckling occurs and the increase in yield strength due to strain hardening of the panel is suppressed. There are many advantages. On the other hand, when a panel-shaped damper is constructed from a low yield point steel plate having vertical ribs and horizontal ribs made of ordinary steel, the vertical and horizontal ribs prevent out-of-plane buckling of the panel,
It is possible to obtain the advantage of preventing a decrease in the yield strength of the damper due to out-of-plane buckling. Panel-like dampers containing these low-yield point steel plates should be placed with sufficient clearance so that they do not interfere with each other by coming into contact with the panel-like dampers fixed to the other surface of the steel pipe when plastically deformed. It is preferable.

A main bar and a shear reinforcing bar may be arranged in the steel pipes constituting the upper support member and the lower support member, and the main bar is preferably extended and fixed in the upper beam or the lower beam. . If the main bars do not extend into the upper or lower beams, anchors are driven into the upper and lower beams, and the anchors are extended and embedded in the upper and lower supporting members, respectively. It is preferable to join the members. Moreover, you may provide a recessed part or a convex part in the inner surface of a steel pipe.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 (a) is a front view showing the vibration damping member of the present invention, and FIG. 1 (b) is a sectional view taken along line Ib-Ib. In FIG. 1, the upper support member 11 has an upper end fixed to the upper beam 41 and a lower end extending into the pillar beam frame, while the lower support member 13 has a lower end fixed to the lower beam 41 and an upper end being a pillar. It extends to the inside of the beam frame, and a clearance of about 30 to 80 cm is opened between the lower end of the upper support member 11 and the upper end of the lower support member 13, and the panel-shaped damper 12 is provided in the vertical clearance. It is fixed. Here, the upper support member 11 and the lower support member 1
3, the main bars 13c and shear reinforcing bars (not shown) are arranged inside the steel pipes 11a, 13a having a square cross section,
It is filled with concrete 13b. Although not shown, the upper and lower beams 41 are provided with anchors that project into the frame, and these projecting portions are the steel pipes 11a, 1a.
It is buried in concrete in 3a. Further, the panel-shaped damper 12 has four low yield point steel plates 12a formed in a flat plate fixed to each of the four surfaces of the steel pipes 11a and 13a by welding, and a gap 12 is formed between adjacent low yield point steel plates 12a.
It is formed by opening b.

Next, a different mode will be described. Figure 2
(A) is a front view showing a damping member different from that of FIG. 1,
2B and 2C are cross-sectional views taken along IIb-IIb and IIc-IIc, respectively. In FIG. 2, the upper support member 21
The lower support member 23 and the lower support member 23 are configured and arranged in the same manner as in FIG. 1, and the panel-shaped damper 22 is fixed in the clearance between the lower end of the upper support member 21 and the upper end of the lower support member 23. Only the damper 22 is different from the damping member 10 of FIG. That is, the panel-shaped damper 22 is provided with a vertical rib 22c made of plain steel on the outside of a flat plate-shaped low yield point steel plate 22a and a lateral rib 22b made of plain steel on the inside thereof. Four sheets 22a are fixed to the four surfaces of the steel pipes 21a and 23a by welding, and a gap 22d is formed between the adjacent low yield point steel plates 22a.

Next, FIG. 3 is a front view of a vibration damping member 30 different from FIGS. 1 and 2. In FIG. 3, FIG. 1 and FIG.
The configuration different from the vibration damping members 10 and 20 of FIG. 2 is only the panel-shaped damper 32, and the upper support member 31 and the lower support member 3
Reference numeral 3 has the same configuration and arrangement as those in FIGS. 1 and 2. Here, the panel-shaped damper 32 includes two steel plates 3
Four units of the unit in which the viscoelastic body 32b is sandwiched between the ends of the 2a and 32c are fixed by welding to the four surfaces of the steel pipes 31a and 33a, respectively, and a gap 32 is formed between the adjacent units.
d is opened.

Next, FIG. 6 is a front view of a vibration damping member 60 different from FIGS. 1 to 3. In FIG. 6, the lower support member 61 has a lower end fixed to the lower beam 41 and an upper end extending to the vicinity of the upper beam 41, while the upper beam 41 is provided with a bracket 62 projecting downward. Between the bracket 62 and the upper end of the lower support member 61, approximately 30-
A clearance of about 80 cm is opened, and the panel-shaped damper 22 is fixed to this vertical clearance.
Here, the lower support member 61 has the same structure as the lower support member 13 in FIG. 1, and the panel-shaped damper 22 shown in FIG. 2 is used. Further, the bracket 62 may be any one that can fix the upper end of the panel-shaped damper 22 to the upper beam 41. In FIG. 6, the lower support member 61 is provided so as to be fixed to the lower beam 41 and extend upward, but the support member may be arranged in the opposite manner. That is, although not shown, an upper supporting member is provided so that the upper end is fixed to the upper beam and extends near the lower beam, a bracket is provided on the lower beam, and the bracket and the lower end of the upper supporting member are provided. Between 30 to 80 cm
It is also possible to provide a certain degree of clearance and fix the panel-shaped damper in this vertical clearance. The damping members 10, 20, 30, 60 described above are
For example, as shown in the plan view of FIG. 4, the structure is preferably vibrated by an earthquake to cause interlayer deformation, and shearing force is applied to the damper so that the building is preferably provided in a place where twisting is unlikely to occur. That is, in the case of a structure having a planar shape with axial symmetry, the damping members 10, 20, 30, 60 are installed at the plane positions with axial symmetry. A beam 45 as shown may be provided at the location where the vibration damping members 10, 20, 30, 60 are installed.

Next, the operation of the vibration damping member 10 will be described. When a structure vibrates due to an earthquake to cause interlayer deformation and a shearing force is applied to the vibration control member 10, the shearing force is decomposed in each direction of the low yield point steel plates 12a arranged in two orthogonal directions, and each direction is divided. Each low-yield point steel plate 12a is plastically deformed according to the energy component of, and the vibrational energy is absorbed by this plastic deformation. In the vibration damping members 20 and 60, similarly, the low yield point steel plates 22a are plastically deformed to absorb vibration energy. However, in the vibration damping members 20 and 60, the vertical ribs 22c and the horizontal ribs 22b are provided on the panel. , Which acts to prevent the out-of-plane buckling of the panel, thereby obtaining the effect of preventing the reduction of the yield strength of the panel due to the out-of-plane buckling. Further, in the vibration control member 30, since the steel plates 32a and 32c are fixed to the steel pipes 31a and 33a, respectively, when a shearing force is applied, the steel plates 32a and 32c are displaced while receiving the resistance of the viscoelastic body to generate vibration energy. Absorbs.

[0014]

In the vibration control member of the present invention, since the panel-shaped damper is fixed to at least two orthogonal planes of the steel pipe having a rectangular cross section, this vibration control member is provided between the upper and lower beams at a predetermined position of the structure. For example, the panel-shaped damper can decompose and bear the vibration energy in each of the two orthogonal directions, and absorb the vibration energy. Therefore, unlike the conventional damping member, the damping member of the present invention does not need to be installed on the beam in two directions of the x-direction and the y-direction, and the labor of mounting can be reduced to about 1/2 of the conventional construction. It is possible to reduce costs.

[Brief description of drawings]

FIG. 1 (a) is a front view showing a vibration control member of the present invention, and FIG. 1 (b) is a sectional view taken along line Ib-Ib.

2 (a) is a front view showing a damping member different from FIG. 1, and FIGS. 2 (b) and 2 (c) are cross-sectional views taken along IIb-IIb and IIc-IIc, respectively.

FIG. 3 is a front view of a vibration damping member different from FIGS. 1 and 2.

FIG. 4 is a plan view showing an arrangement of columns and beams of a vibration control structure incorporating the vibration control member of the present invention.

5A to 5C are diagrams showing a conventional example.

6 is a front view of the vibration damping member of the present invention, which is different from FIGS. 1 to 3. FIG.

[Explanation of symbols]

10, 20, 30, 60 Vibration control members 11,21,31 Upper support member 12, 22, 32 Panel damper 13, 23, 33, 61 Lower support member 12a, 22a Low yield point steel plate 41 beams 42 pillars

Claims (2)

[Claims] 1. A vibration control member provided in a column beam frame, comprising a damper and an upper support member and a lower support member fixed above and below the damper, respectively, or a damper and An upper side or a lower side supporting member fixed to either one of the upper and lower sides of the damper, wherein the upper side supporting member and the lower side supporting member are steel pipes having a rectangular cross section filled with concrete, and the damper is low. A vibration damping member, which is a panel-shaped damper including a yield point steel plate and fixed to at least two orthogonal surfaces of the steel pipe having the rectangular cross section. 2. A vibration control member provided in a column beam frame, comprising a damper and an upper support member and a lower support member fixed above and below the damper, respectively, or a damper and An upper side or a lower side support member fixed to either one of the upper and lower sides of the damper, wherein the upper side support member and the lower side support member are steel pipes of rectangular cross section filled with concrete, and the damper is a viscous material. A panel-like damper formed by sandwiching one material of elastic body, rubber-like elasto-plastic body and viscous body between steel plates, which is fixed to at least two orthogonal surfaces of the steel pipe having the rectangular cross section. A vibration control member characterized by being present.