JPH04119231A - Elastic and plastic damper unit - Google Patents

Abstract

PURPOSE:To bring an energy absorbing ability into full play by connecting one of gripping jigs on both edges of a damper to the damper so as to be capable of relative displacement in the axial direction of the damper, and having the gripping jig shoulder only shear force. CONSTITUTION:A damper unit U is constituted of an elastic damper l and a pair of gripping jigs 21 and 22 arranged in a constructive member or a non- constructive member to support both edges of the damper. The damper 1 consists of a damper part having a contracted cross section and support parts supported with the gripping jigs 21 and 22 on both sides. A vertical form in the damper part can correspond to bending moment distribution, and can yield uniformly through the overall length in the axial direction, and can absorb energy effectively. A filling and fixing member 3 such as cement mortar is injected into the gripping jig 21, and a hole having a depth with relative displacement in view is bored in the gripping jig 22. In this way, energy absorbing ability can be brought into full play without making the relative displacement unstable.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an elasto-plastic damper unit comprising an elasto-plastic damper and a jig for gripping the damper without applying an external force to the damper. It is.

[Problem to be solved by the invention]

An application has been filed for an elastoplastic damper in the form of a plate or one rotating body that is structurally insulated and installed between structures or structural members that cause relative displacement to absorb vibration energy input into the structure during earthquakes. People have made many suggestions so far.

The plate-shaped damper has an opening in the middle part in the height direction.
In addition, rotor-shaped dampers have an external shape that is close to the bending moment distribution caused by external force (by having a shape that is compact, they have the advantage of having high energy absorption efficiency and being able to be installed anywhere). .

On the other hand, this type of elasto-plastic damper is fixed to a structural member at both ends in the direction perpendicular to the external force, and plate dampers are resistant to external forces in one direction within the plane, while rotary dampers are resistant to external forces in two directions. It exhibits energy absorption ability by elastic-plastic deformation while bearing shear force, but at the same time, as the relative displacement between structural members increases in the direction of shear force action, the direction perpendicular to this, i.e. A displacement difference also occurs in the direction of the mounting end, and this displacement difference forcibly applies an unexpected axial force to the damper.

This axial force acts together with shear force, causing unstable phenomena such as buckling in the damper before it reaches its intended capacity, making it impossible to qualitatively and quantitatively control its energy absorption capacity. have the effect of making it happen.

This invention was made by focusing on the weak point of the damper due to the axial force acting in the direction of the mounting end, and attempts to propose a new device with a structure that overcomes this problem.

[Means to solve the problem]

In the present invention, one of the gripping jigs that grip both ends of the damper in the mounting direction is connected to the damper so as to be relatively movable in the axial direction of the damper, so that the axial movement of the damper is not restricted and an axial force is applied to it. The damper is kept in a state where it is not applied, that is, only shear force is applied, and the damper's unexpected deformation ability is fully exhibited.

The device is separated by a distance between structural members.

Alternatively, an elastic-plastic damper installed between non-structural members or between both, and a pair of gripping jigs that grip both ends of the damper and are fixed to the structural member or the non-structural member form a set of units, The elasto-plastic damper includes a damper part in the shape of a rotary body that absorbs energy by elastically deforming in the direction in which external force is applied;
It consists of a support part at both ends supported by a gripping jig, one end of the support part is fixed to the gripping jig on that side, and the other end is free to move relative to the gripping jig on that side in the axial direction as described above. inserted into.

〔Example〕

The present invention will be explained below based on the drawings showing one embodiment.

As shown in FIGS. 1-1 and II, the damper unit U of the present invention includes an elastic-plastic damper (hereinafter referred to as a damper) 1 that absorbs energy, and its both ends are supported and installed on a structural member S1 or a non-structural member S2. A pair of gripping jigs 21 and 2□ are configured as a set.

As shown in FIGS. 2 and 3, the damper l includes a damper portion 1a whose cross section is relatively reduced and whose yield strength is reduced, and a support portion 1b at both ends supported by gripping jigs 2+ and 2z.
The damper portion 1a has a rotating body shape that can function against an external force in any direction in a plane perpendicular to the axis.

Further, the damper portion 1a has an upright shape corresponding to the bending moment distribution that changes along the axial direction due to the shear force acting perpendicularly to the axis between the support portions 1b and lb.

In other words, when the supporting parts 1b and lb on both sides are supported with their rotation about the axis being restrained, and the damper part 1a undergoes shear deformation, the damper part 1a becomes an hourglass shaped with a constricted central part, as shown in Figure 2-■ and H. If the support part 1b on the - side is supported in a state where the rotation is not restricted and bending deformation occurs in the cantilever structure, the support part 1b on the - side is moved toward the support part 1b which is free to rotate as shown in Fig. 3-I and II. Each is formed into a bell-shaped shape that gradually tapers. The damper portion 1a is processed, for example, by cutting the middle portion of a steel rod having a circular cross section.

In either case, the vertical shape corresponds to the bending moment distribution, so that the damper portion 1a yields uniformly over the entire length in the axial direction, and efficiently absorbs energy.

In particular, the damper 1 that deforms into a cantilever type as shown in FIG.
The support portion 1b on the relative movement side has a spherical shape or a shape close to it so that its movement and rotation can be performed smoothly.

Each I in FIGS. 2 and 3 is a case where the damper part 1a is processed continuously from the support part 1b. If the diameter of the damper part 1a is large, ■ is a case where the damper part 1a is processed continuously from the support part 1b. This is an example of manufacturing in which the diameter is smaller than that of the support portion 1b by machining, and the size of these diameters is selected depending on the set energy absorption capacity. By combining a plurality of dampers 1 with different capabilities, the overall stiffness, yield strength, deformation performance, and other characteristics of the dampers 1 assembled in one place can be set arbitrarily and variably.

The gripping jigs 22, 2□ are located at both ends of the damper 1 as shown in FIG.
21) fixes one support part 1b of the damper 1, and fixes the other support part 1b (
2□) grips the other support portion 1b in a state that allows relative movement of the damper portion 1a in the axial direction.

Figure 1-I is an example of support for the damper 1 shown in Figure 2 in which the rotation of both support parts 1b and lb is restrained, and ■ is a support example of the damper 1 shown in Figure 3 in which the rotation of one support part 1b is not restrained. This is an example of supporting No.1.

The gripping jig 21 on the side that fixes the support part 1b injects a filling and fixing material 3 such as mortar into the gap between the embedding hole 2a and the support part 1b, as shown in (2). Alternatively, as shown in (2), a female thread and a male thread are formed in the embedded hole 2a and the support part 1b, respectively, and the support part 1b is fixed by means such as screwing the support part 1b into the embedded hole 2a.

The embedded hole 2a of the gripping jig 2□ on the side that moves relatively has a depth that takes into account the amount of relative movement, as shown in the figure, and the support part 1b
A small gap is provided between the outer periphery and the gap is treated to reduce friction, such as filling a lubricant such as oil, as necessary.

4-1 to 4-m show an example of manufacturing the fixed side gripping jig 21, the cross section of the embedded hole 2a has the same shape as that of the support part 1b of the damper 1, and in the embodiment, it is circular. An anchor rod 2b for fixing to the structural member S1 or the non-structural member S2 is provided protruding from the outside. The anchor rod 2b protrudes from a surface other than the surface in which the embedded hole 2a is drilled, and its outer periphery has a structure for bolting to, for example, a structural member 31 of a steel frame structure.
Screws and the like for fixing to the reinforced concrete structural member S6 and the like are formed.

Fig. 5-■ to ■ show an example of manufacturing the relatively movable side gripping jig 2□, except that the embedded hole 2a is deeper than the fixed side gripping jig 2. It has a similar shape.

The gripping jig 2 □ shown in FIG. 5 only allows relative movement of the damper 1 in the axial direction, and by restraining relative movement in any direction in a plane perpendicular to the axial direction, the damper 1 can be moved anywhere within that plane. This is an example of production in which the function is performed in the direction shown in FIG. This allows the damper 1 to function only in one specific direction, and it is possible to create a structure in which no external force is applied to the direction orthogonal to that direction.

Fig. 7-1 shows that the depth of the embedding hole 2a of the gripping jig 2□ on the relative movement side is set so that the total length of the damper 1 is This shows an example of how to make it to a size that will fit.

In this case, the damper unit U is supported on the formwork with the holding jig 2□ on the relative movement side placed on the upper side, and the damper 1 stored in the holding jig 2□, as shown in Fig. 8-■. After the concrete is poured and hardened to fix it to the structural member S3, etc., the damper 1 is installed as shown in (■).
2. by dropping the fixed side, that is, the lower gripping jig 2. The damper unit U is installed by fixing it at a predetermined position.

The damper unit U is installed between the structural members sl and s1, or between the non-structural members SI 52, or between both S, 52.
+ Or a specific example of installation on the non-structural member S2 will be explained. In the figure, part of the damper unit (U) is shown simplified as a rod.

The embodiment shown in Fig. 9 is a structural member S that is connected to the upper and lower beams in the column/beam frame and separated at a distance from each other in the middle, and that does not bear vertical loads and can resist only horizontal forces. ,,
If a damper unit) U is installed between walls that are S,
Similarly, the embodiment shown in Fig. 10 is a structural member S, which is connected to the upper and lower beams and does not bear vertical loads, and is installed between the studs, and the embodiment shown in Fig. 11 is a structural member S. This is a case where it is installed between a certain beam and a panel of a curtain wall of a non-structural member S2.

In the embodiment shown in FIG. 11, the damper unit U is located at a location where relative displacement occurs between the panel and the beam due to external force, that is, at the bottom in the case of a suspended panel where the panel is supported by a beam on the upper floor.
In the case of a floor-standing type that is supported by beams on the lower floor, it is installed on the upper side.

In the above embodiment, the damper unit (U) is installed with the axis of the damper portion (1a) facing vertically, and as a result, the structural member (S) that it straddles is
1 or non-structural member 32 at any horizontal relative displacement.

In the embodiment of FIG. 12, as in the embodiment of FIG. 10, between the structural member S and the structural member S1, which are structurally insulated,
This is a case where the axis of the damper portion 1a is installed horizontally, and in this case, the damper 1 functions during vertical displacement between both beams and during horizontal displacement in one direction perpendicular to the plane of the paper.

In addition, in the above embodiment, the frame of the structural member SI and the non-structural member S2 excluding the curtain wall panel is a steel frame structure,
Constructed of either reinforced concrete construction or steel-framed reinforced concrete construction.

FIG. 13 schematically shows a case where the present damper unit U is installed across adjacent buildings with different natural frequencies that cause relative displacement mainly in the horizontal direction. ■ indicates the case between buildings with different heights, and ■ indicates the case between buildings with the same height but different horizontal stiffness. If the vibration characteristics of the reconstructions are the same, the relative displacement in the vertical direction is different, and it is also effective in the case of the same height.

Details of the specific example are shown in FIG. 14 and below.

The embodiment shown in Fig. 14 is a case in which the damper part 1a is installed across the slabs, which are the structural members s, and S+ of each building, with the axis horizontal, and the damper part 1a is installed in the out-of-plane direction of the slabs, that is, in the vertical direction and in the axis. This method is effective for relative displacement in the in-plane direction of a vertical slab.

In order to absorb energy in two in-plane directions at the joint part of the slab, a plurality of dampers 1 are installed in the damper section 1a.
For example, as shown in Fig. 15-■, the end faces of both slabs may be formed into uneven surfaces that engage with the pressure on the plane, and the end faces facing in two horizontal directions may be arranged so that their axes are perpendicular to each other in the horizontal plane. This can be solved by straddling the damper unit U between them. As a result, the damper 1, whose axis is oriented in the X direction in the figure, is
The oriented damper 1 functions effectively against relative displacement in the X direction and the Z direction, and energy is absorbed in all three-dimensional directions at the joint portion.

The embodiments shown in Figs. 16 and 17 are cases in which a damper unit U is installed horizontally between opposing column-beam joints as structural members S, S, of adjacent buildings, and the former is an RC structure, In the case of SRC construction, the latter shows an installation example for S construction.

As shown in the figure, in the case of RC construction or SRC construction, the anchor rod 2b is fixed to the frame, and in the case of S construction, it is welded or bolted to the column, and the gripping jig 2. , 22 are fixed.

The embodiments shown in FIGS. 18 and 19 are cases in which a damper unit (U) is horizontally extended between the beams of the opposing structural members Sl, S, and extends continuously from the column-beam joint.

In the case of the former RC construction or SRC construction, the damper units U are embedded in the concrete of the beam, and in the latter S construction, they are arranged in parallel on both sides of the beam web as shown in Figure 19-H. Ru.

The embodiment shown in Fig. 20 is a modification of Fig. 18, in which a damper unit U is installed between the overhanging members of the column-beam joint and the non-structural member S2+ sz that overhang from the slab with a level difference in the height direction. This is the case when it is installed facing vertically.

〔Effect of the invention〕

The present invention is as described above, and one of a pair of gripping jigs that grip both ends of the damper is connected to the damper in a state that allows relative movement of the damper part in the axial direction. It is maintained in a state where it bears only shear force without bearing any force, and it is not destabilized by relative movement in the axial direction or between structural members, etc., and it fully utilizes its energy absorption ability. I can do it.

[Brief explanation of the drawing]

Figure 1 N and ■ are sectional views showing the structure of the present invention, Figure 2 -
I, II, Figure 3 - I, II are perspective views showing an example of manufacturing a damper, Figure 4 - ■ is a perspective view showing an example of manufacturing a holding jig on the fixed side, ■ and ■ are the planes thereof, respectively. Figure, sectional view, 5th
Figure 6-1 is a perspective view showing an example of manufacturing a gripping jig on the relative movement side. 7 - ■ is a perspective view showing an example of manufacturing a gripping jig for storing a damper in an embedded hole, ■ and ■ are its plan view, sectional view, and 8
Figure - [11 is a sectional view showing the construction procedure using the gripping jig shown in Figure 7, each I in Figures 9 to 11 is an elevation view showing an example of installing this damper unit, ■ is Its cross-sectional view, 1st
Figure 2 is an elevation view showing another example of installation, Figure 13 - ■ is a plan view showing an overview of installation between adjacent buildings, ■,
■ is an elevation view, Figure 14-■ is a cross-sectional view showing an example of installation between slabs as a specific example of Figure 13, ■ is a plan view, and Figure 15-■ is a cross-sectional view of the installation between slabs. A plan view showing an installation example where energy is effectively absorbed in two directions, ■ is a cross-sectional view, and each I in Figures 16 and 17 is an elevation view showing an example of installation at a column-beam joint. Fig. 18 and 19 - ■ are elevational views showing an example of installation between beams protruding from joints, Fig. 19 - ■ is a cross-sectional view of ■, and Fig. 20 is a plan view. FIG. 7 is an elevational view showing another installation example. U...Damper unit, 1...Damper, 1a...Damper portion, 1b...Support portion, 2. ．． 2□...Gripping jig, 2a...
Embedded hole, 2b... Anchor rod, 3...
・Filling and fixing material, Sl... Structural member, S2...
...Nonstructural members. Figure Figure ■! Figure q F I Figure No] 1 Figure Figure ■ Figure ■ ■ ■ Figure ■ ■ ■ Figure ■ ■

Claims (1)

[Claims] (1) An elastic-plastic damper installed between structural members separated by a distance, or between non-structural members, or between both, and a pair that grips both ends and is fixed to the structural member or non-structural member. The elasto-plastic damper is a damper unit consisting of a gripping jig, and the elasto-plastic damper is a damper portion in the shape of a rotating body that absorbs energy by elastically deforming in the direction in which external force is applied;
It consists of supporting parts at both ends that are supported by the gripping jig, one of the supporting parts is fixed to the gripping jig on that side, and the other is inserted into the gripping jig on that side so as to be relatively movable in the axial direction of the damper part. An elastic-plastic damper unit characterized by: