JPS63114772A - Axial force damper - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an axial force damper used in building frames, etc., and is particularly suitable for use in earthquake-resistant or restraining structures.

[Conventional technology]

Common dampers used in earthquake-resistant structures include rod-shaped elastoplastic dampers, oil dampers, and viscous dampers using viscous materials, which are used in building foundations in combination with laminated rubber bearings in seismic isolation structures. (
Nikkei Architecture December 30, 1985 Issue No. 34
(pages 41-41).

In addition, Japanese Patent Publication No. 54-28226 discloses a vibration damping device that uses a viscous damper made of resistance plates arranged at predetermined intervals and a high viscosity substance filled in the gaps as a place, etc., and is installed inside the wall of a building. is disclosed.

[Problem that the invention seeks to solve]

In a building frame, when using a damper to attenuate shaking caused by an external vibrating force such as an earthquake, in order to obtain effective damping, the above-mentioned vibration damping device requires a large device and is difficult to maintain and replace. is possible.

In particular, in Japanese Patent Application No. 61-112026, the applicant
Rather than passive seismic resistance, based on the judgment of a response prediction system based on detected seismic motion, etc., the connection state of each part of the building is changed, and the rigidity of the building itself is changed to create a state outside the resonance area or with little resonance. proposed a method of installation that aims to ensure the safety of the building, its equipment, residents, etc.; however, the effectiveness of such installation methods can be increased by using dampers in the building frame. Therefore, it is desirable to have a damper structure that can obtain effective damping with a compact structure.

[Means for solving problems]

The present invention will be explained below with reference to FIG. 1 showing the basic structure.

As shown in the figure, the axial force damper A of the present invention has dogleg-shaped main members 1 and 2 which have common points (indicated by pins 4a and 4b in the figure) that receive the axial force N, and pins 5a and 5b, respectively.
They are connected with a damper 3 interposed between them, and the function of the damper 3 acts on the axial force N in an expanded manner.

As the damper 3, an oil damper 32 (Fig. 2 (al.
), viscous damper 3b (see Fig. 2 (bl)), friction damper 3C (see Fig. 2 (see C1), electromagnetic damper,
Various dampers such as elastoplastic dampers are possible, and 75a
, 5b (in the figure, 6 is oil, 7
is a viscous body).

[For production]

Referring to FIG. 1, if the deformation of the damper 3 is set to 45 degrees with respect to the deformation δ in the direction of the axial force N, then δ/lan θ
(θ is the direction of the axial force N and each member 1a.

The angle formed by Ib, 2a, and 2b) is enlarged, so when an axial force N acts on the damper 3 due to an external vibration force during an earthquake, the speed is higher by l/lan θ than the speed in the direction of the axial force N. act. Therefore, if a material proportional to the velocity of a viscous body is used for the damper 3, the effect will be great. Also, in the case of an elasto-plastic damper that utilizes the elasto-plastic hysteresis characteristics of metal objects, the damper 3 acts with the deformation δ in the direction of the axial force N being expanded to δ/lan θ (θ<45°), so the damping effect is large.

〔Example〕

FIG. 3 shows a modification of the one shown in FIG. 1 described above, in which a spring 8 is also used in order to improve specific vibration characteristics. The other basic structure is the same as that shown in FIG.

FIG. 4(a) shows an electromagnetic variable damper 9 as a damper.
In this example, concrete variable dampers 9a and 9b are shown in 4th (b) and 4(c), respectively. Figure 4 (BL type is a cylinder filled with electrorheological fluid 10 and the flow is controlled by adjusting the voltage at the electrode 11. Figure 4 (C1O type is a cylinder filled with electrorheological fluid 10). The flow is controlled by the electromagnetic force of the electromagnet 13. Although neither of them can bear a large force, the force applied to the damper 9 is Nta
This is advantageous because it is reduced to n θ (θ<45°). Since this variable damper 9 can be controlled by a computer or the like, it can be used to change the resistance of the damper 9 from time to time according to input seismic motion, etc., and change the vibration performance of the building to reduce the amount of response. be.

FIG. 5 shows the case where the axial force damper A of the present invention is used as a place in a building frame, and can efficiently damp the axial force acting on the place against vibrations and the like. Note that if the function of the damper 3 is impaired, only the damper 3 portion needs to be replaced.

Figures 6(a), (b), (C1 is the case where an elasto-plastic damper that utilizes the elasto-plastic hysteresis characteristics of hardware is used as the damper 3.The elasto-plastic damper has a box shape as shown in Figure 6 fc). This utilizes the bending yielding of a metal plate, and when the bending yields, energy is absorbed through plastic deformation. The mounting method may be such that the hollow portion faces the front as shown in FIG. 6(a) or sideways as shown in FIG. 6(b).

As described above, the displacement of the axial force damper A in the direction of the axial force N is expanded by 6 times δ/lan (θ x 45°) in the damper 3, so a large damping force can be obtained.

Figures 7 (al to f) show modified examples of elasto-plastic dampers that utilize the bending yield of similar metal plates, and are circular (
Figure (a)), semicircle (Figure (bl), combination of semicircles (
Figure (C)), oval (Figure (d)), groove shape (Figure (e))
), a combination of grooves (FIG. 6(f)), and various other shapes are possible.

FIG. 8(a) shows a damper 3 in which a pair of vertically facing plate-shaped shaft members 3b and supporting hardware 3a provided on both sides of the shaft members 3b are horizontally connected by a plurality of plates 3'. This shows an example of an elastoplastic damper made of metal, which utilizes the bending yield of a plurality of plates 3'. FIG. 8 (bl similarly shows the supporting hardware 3a on both sides and the lower shaft member 3b.
The upper shaft member 3b and the supporting hardware 3a are connected by a plurality of plates 3'. These can be formed integrally, but as shown in FIG. 8(C), a plate 3' is placed through the support metal fitting 3a and the shaft member 3b, and the ends are fixed by welding or split pins. You can.

Figure 9 (al, (b)) shows a hardware in which a plurality of rods 3'' are arranged instead of the plurality of plates 3' in Figure 8 (al, (b)), and the bending yield of rod 3# is utilized. In this case as well, even if the hardware is integrally molded,
(C1, (as shown in dl, weld the end of the rod 3# that passes through the support hardware 3a and the shaft member 3b, or
4 or may be fixed with nuts 15.

FIGS. 10(a) and 10(b) also show, as an example of an elastoplastic damper, a metal damper 3 consisting of a frame 3C and a plate 3d arranged vertically within the frame.

In this example, we use a virtual 3D shear yield placed vertically,
Energy is absorbed by plastic deformation.

11(al) and (b) are examples of a lead damper as an elastic-plastic damper.FIG. 11(al) and (b) show an example of a lead damper as an elastoplastic damper.
Alternatively, a lead damper 16 like that shown in FIG. 11 (dl) is interposed. FIG. 11 (C) shows a pair of mounting plates 17 facing each other.
Laminated rubber 18 is sandwiched between them, and a lead column 16a is embedded as a core. FIG. 11 (dl shows a pulley-shaped lead core 16b fixed between mounting plates 17.

〔Effect of the invention〕

Compared to the case where the damper acts directly in the axial direction, the deformation and velocity at the damper position are reduced by θ〈
By setting the angle to 45°, the attenuation effect is large because it is expanded by 1/lanθ times.

Furthermore, when using an electromagnetic variable damper to change the resistance, the force applied to the damper is reduced by tan 0 times, so the burden on the damper is small (which is advantageous).

Only the central damper can be replaced, making maintenance and management easy.

[Brief explanation of the drawing]

Fig. 1 is a schematic sectional view showing the basic structure of the axial force damper of the present invention, Fig. 2 (al to fc) is a sectional view showing an example of the damper, and Fig. 3 is a schematic sectional view when a spring is used in combination. Figure 4 (a) is a sectional view when a variable damper is applied, Figure 4 (bl, (C) is a sectional view showing an example of a variable damper, and Figure 5 is an example of application to building frame blues. Front view, Figure 6 (a), fbl is a front view showing an application example of the elastic-plastic damper, Figure 6 fc) is a perspective view of a part of the elastic-plastic damper, Figure 7 fa) to (f) are bending of the plate. A perspective view showing a modification example of an elastoplastic damper using yielding, FIG. 8(a),
(bl is a perspective view showing an example of an elastic-plastic damper that utilizes the bending yield of multiple plates, Figure 8 (C) is a perspective view showing a method of fixing plates, Figures 9 (a) and (b) are multiple A perspective view of an elastoplastic damper that utilizes the bending yield of a bar, Figure 9 (C),
(d) is a perspective view showing how to fix the rod, FIG. 10(a),
(b) is a perspective view showing an example of an elastoplastic damper that utilizes the shear yield of a plate, Figure 11 (al), (bl is a perspective view showing an example of a lead damper, Figure 11 (C1, It is a perspective view showing an example of the structure of the core part. A... Axial force damper, 1, 2... Main member, 3... Damper, 4 a, 4 b , 5 a, 5 b...
Pin, 6... Oil, 7... Viscous body,
8... Spring, 9... Variable damper, 1
0... Electrorheological fluid, 11... Electrode,
12...Magnetic fluid, 13...Electromagnet,
14... Cotter pin, 15... Nut,
16...Lead damper, 17...Mounting machine, 18...Laminated rubber. Figure 1 Figure 2 (a) (b) (c) 3rd
Figure 4 (a) (b) (C) Figure 5 Figure 7 (a) (b) (C)
nl Figure 8(a) Figure 9(a)

Claims (4)

[Claims] (1) Pin joints are made between the mutually opposing dog-shaped main members that share the same point of receiving the axial force at the ends of both materials, and the pin joint positions are connected with a damper interposed between them. Features an axial force damper. (2) The axial force damper according to claim 1, wherein the damper is an oil damper or a viscous damper. (3) The axial force damper according to claim 1, wherein the damper is a variable resistance damper using an electrofluid or a magnetic fluid. (4) The axial force damper according to claim 1, wherein the damper is an elasto-plastic damper that utilizes the elasto-plastic hysteresis characteristics of metal objects.