JP2000274107A - Elastoplastic energy absorbing body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an absorbing body of earthquake energy which can be adapted for a narrow wall part. SOLUTION: A pair of columns 3, 4 are arranged between upper and lower beams 1, 2 and both ends thereof are fixed to the beams 1, 2 to constitute a frame structure. Fitting members 5, 6 are attached by bolts or welding to the confronting faces 3a, 4a of the columns 3, 4. A plurality of energy-absorbing members 7 are removably fitted to the fitting members 5, 6. The energy absorbing member 7 is made of a low yield point steel and held by a regulating member and the fitting members 5, 6 to restrain deformation in the out-of-plane direction and absorb earthquake energy acting in the plane direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for absorbing seismic energy acting on a steel frame structure, particularly a frame structure of a medium- to low-rise steel-framed house, and reducing the distance between a pair of adjacent columns. The present invention relates to an elastic-plastic energy absorber capable of forming

[0002]

2. Description of the Related Art As an elasto-plastic energy absorber for absorbing seismic energy acting on a steel frame, there is a technique disclosed in, for example, JP-A-6-330653. As shown in FIG. 8, this technique (first known example) uses beams
A main frame member 53 that is formed by providing a pair of left and right columns 52 between the
And a connecting frame member 54 installed horizontally, and an oblique member 55 installed obliquely between the main frame member 53 and the connecting frame member 54, and furthermore, a plastic body is provided at the center of the connecting frame member 54. 56 are arranged. The diagonal member 55 has a function of attaching the plastic body 56 to the column 52 and transmitting a force acting upon an earthquake.

In the above configuration, when a large seismic force acts, the plastic body 56 first yields and undergoes plastic deformation, thereby absorbing seismic energy. Also diagonal 55
Instead of using a triangular or rhombic stiffening panel, attach this stiffening panel between the columns 52 and attach a plastic body between the stiffening panels so that seismic force can be transmitted and seismic energy can be absorbed. Some have been configured. Further, there is a configuration in which a plastic body that has been plastically deformed can be quickly returned to an initial state by replacing the plastic body (Japanese Patent Application Laid-Open No. 9-273329).

Further, as shown in FIG. 9, there is a technique (second known example) in which a slit plate 57 having a plurality of slits 57a formed between a pair of left and right columns is attached. In this technique, the web is plastically deformed, thereby absorbing seismic energy.

[0005]

In the technique of the first known example described above, although high energy absorption efficiency is exhibited, an oblique material or a stiffening panel is indispensable. It is conceivable to increase the number by making it smaller.
However, it is not realistic because the number of parts increases and the number of parts to be attached to the pillars increases and the number of parts increases. For this reason, there is a problem that the width dimension (the interval between the left and right columns) must be large.

In the technique of the second known example, the width, height, plate thickness, etc. of the slit formed in the slit plate are set so as to satisfy all conditions such as appropriate strength, rigidity and sufficient deformability as an earthquake-resistant element. Is extremely difficult to set.

An object of the present invention is to provide an elasto-plastic energy absorber capable of reducing the distance between a pair of columns and adjusting the energy that can be absorbed.

[0008]

According to the present invention, there is provided an elasto-plastic energy absorber according to the present invention, comprising: a vertically arranged beam; and a pair of columns arranged between the beams. And a plurality of energy absorbing members removably attached to the elongated members attached to opposing surfaces of the pair of columns.

In the elasto-plastic energy absorber, a frame is formed by arranging and mounting a pair of columns between vertically arranged beams, and the frames constituting the frame are vertically elongated on opposing surfaces thereof. By attaching a plurality of energy-absorbing members to this vertically long material in a detachable manner, the energy-absorbing members are plastically deformed by a horizontal force acting on the frame during an earthquake, thereby absorbing seismic energy. I can do it. Therefore, the elongated member has a function of attaching the energy absorbing member to the column and transmitting a force acting during an earthquake.

In particular, by attaching a plurality of energy absorbing members to one longitudinal member attached to a pillar,
When a force acts on the energy absorbing member during an earthquake, the force is reduced by the longitudinal members, so that the column does not concentrate and act on the energy absorbing member at each mounting portion of the energy absorbing member. For this reason, the performance such as the strength of the columns does not need to be particularly high, as long as a certain performance as a frame is ensured.

On the other hand, when the distance between the columns in the first known example is reduced, a plurality of energy absorbing members are arranged between the columns, and each energy absorbing member is attached to the stiffening panel, The force acting on the energy absorbing member is transmitted to the column for each mounting portion of the stiffening panel, and it is necessary to increase the strength and bending rigidity of the column.

Therefore, by attaching a plurality of energy absorbing members to one longitudinal member as in the present invention,
The dimensions of the columns can be reduced while maintaining the performance of the columns at a constant value.

[0013] Since the energy absorbing member is detachably attached to the vertically elongated member attached to the frame, the plastically deformed energy absorbing member is removed from the elongated member and a new energy absorbing member is attached.
It is possible to respond to an earthquake by returning to the initial state.
In particular, by appropriately setting the number of energy absorbing members attached to the frame, the energy that can be absorbed during an earthquake can be adjusted.

Further, since the plurality of energy absorbing members are attached to one elongated member attached to the frame, the distance between the pair of columns constituting the frame can be reduced, and the energy consumption of the small-sized earthquake is high. An elastic-plastic energy absorber having flexibility can be configured. The intervals at which the energy absorbing members are attached to the vertically long members need not necessarily be equal.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the above elasto-plastic energy absorber will be described below with reference to the drawings. FIG. 1 is a diagram illustrating the configuration of the elasto-plastic energy absorber according to the first embodiment. FIG. 2 is a view for explaining the configuration of the elasto-plastic energy absorber, and is a view taken along the line II-II in FIG. FIG.
FIG. 4 is a diagram illustrating a state in which an energy absorbing member is attached to a frame structure. FIG. 4 is a three-view drawing illustrating the configuration of the energy absorbing member. FIG. 5 is a diagram illustrating the configuration of the regulating member. FIG. 6 is a diagram illustrating the configuration of the elasto-plastic energy absorber according to the second embodiment. FIG. 7 is a view for explaining the configuration of the elasto-plastic energy absorber according to the third embodiment.

The elasto-plastic energy absorber according to each embodiment has a structure in which a plurality of energy absorbing members are detachably attached to a vertically long member attached to a frame having a pair of columns. It is possible to adjust the energy that can be absorbed by appropriately setting the number, and by attaching the energy absorbing member via a vertically long member attached to the frame structure composed of columns, the width dimension of the frame structure, that is, the column It is possible to reduce the size between them.

In each of the embodiments described below, the distance between the centers of the pair of columns is set to about 300 mm, and the maximum dimension is set to be about 450 mm.

Next, the configuration of the elasto-plastic energy absorber A according to the first embodiment will be described with reference to FIGS. In the figure, upper and lower beams 1 and 2 are arranged at a predetermined interval, and a pair of pillars 3 and 4 are arranged between these beams 1 and 2. It is fixed to 2.
The columns 3 and 4 constitute a frame together with the beams 1 and 2 and have predetermined strength and rigidity. Longitudinal members 5 and 6 are attached to opposing surfaces 3a and 4a of columns 3 and 4, respectively.
A total of four energy absorbing members 7 are mounted at substantially equal intervals.

In the above configuration, the configuration of the beams 1 and 2 is not particularly limited. That is, when the elasto-plastic energy absorber A is formed on the first floor wall, the beam 1 is a second-floor floor beam or a first-floor ceiling beam made of a steel beam, and the beam 2 is a first-floor beam. Floor beams are used. The floor beam on the first floor is not necessarily a steel beam, but may be a reinforced concrete beam 2.

The columns 3 and 4 have a sufficiently high strength and rigidity so that the horizontal force acting upon the earthquake can be transmitted to the energy absorbing member 7. The pillars 3 and 4 have connection portions with the beams 1 and 2 arranged vertically, and are formed as connection members 3b and 4b having a cross-section in the cross section, and a central portion in the longitudinal direction has a rectangular structural tube. Are constituted as main bodies 3c and 4c.

The longitudinal members 5 and 6 are provided on the surfaces 3a and 4a of the columns 3 and 4, respectively.
A plurality of (at least two) energy absorbing members 7 are detachably attached to the
4 is constituted by an elongated member along the main body portions 3c, 4c.

The elongated members 5, 6 may be formed by welding flat bars having a predetermined thickness to the surfaces 3a, 4a of the columns 3, 4, and as in the present embodiment, the mounting portions 5a, 6a. And connection part 5
It may be configured as a T-shaped member composed of b and 6b, and this member may be attached to the surfaces 3a and 4a of the columns 3 and 4 by fastening using bolts 8.

The vertically elongated members 5 and 6 correspond to the main body 3 of the columns 3 and 4.
The members may be formed so as to have a length approximately half of the lengths of c and 4c, and two members may be attached to the surfaces 3a and 4a of the columns 3 and 4 (see FIGS. 1 and 6). In addition, main body parts 3c, 4c
Formed with a length substantially equal to the length of
a, 4a.

As described above, even if the vertically long members 5 and 6 are constituted by one member substantially equal in length to the columns 3 and 4,
The length may be divided into a plurality of members, a flat bar, a T-shaped or an L-shaped. In any case, the vertically long members 5 and 6 only need to be able to attach a plurality of energy absorbing members 7.

As described above, when a plurality of energy absorbing members 7 are attached to one longitudinal member 5, 6, when a horizontal force acting during an earthquake is borne, this force is applied via the longitudinal members 5, 6. It is transmitted to pillars 3 and 4. At this time, since the vertically long members 5 and 6 have a predetermined length, no excessive load is applied to the columns 3 and 4. As a result, pillars 3 and 4
Can be lowered. Therefore, pillar 3,
4 can be prevented from rotating at the point of action of the force, and the degree of fixation can be improved.

That is, a concentrated load does not act on the columns 3 and 4. Therefore, local distortion, twisting and the like are prevented from being generated on the columns 3 and 4, and the forces are rationally transmitted. It is possible.

As shown in FIGS. 2 to 4, the energy absorbing member 7 is formed with an arc-shaped constricted portion having a wide width at both ends and concave outwards near the center on both sides in the width direction. It is composed of a main body 7a made of a plate material and a bent portion 7b formed in an arc-shaped constriction formed in the center. Two bolt holes 7c are formed on both ends of the main body 7a. One bolt hole 7d is formed inside these bolt holes 7c.

The conditions such as the shape and size of the constricted portion formed on both side surfaces of the main body 7a (radius of the arc, the center position of the radius, the height of the bending portion 7b, etc.) are set at the design stage. The energy that can be absorbed by each energy absorbing member 7 is set.

One or two energy absorbing members 7 (two in this embodiment) are brought into contact with the vertically elongated members 5 and 6, and bolts 9a are inserted into bolt holes 7c to fasten nuts 9b and bolts 9b. The regulating member 11 is brought into contact with the hole 7d and the bolt 10
The energy absorbing member 7 can be detachably attached to the vertically long members 5 and 6 by inserting the nuts 10a and fastening the nuts 10b.

The energy absorbing member 7 is preferably made of low yield point steel. This low-yield-point steel is manufactured by reducing the carbon content to make it closer to pure iron, increasing the crystal grain size, or adding a small amount of an element such as niobium (Nb). As a result, the yield point is reduced to about half the value, and the elongation property is enhanced and the tensile strength is reduced. Therefore, even if the amount of deformation of general mild steel is within the elastic limit, plastic deformation occurs, and it is possible to absorb seismic energy corresponding to the energy required for strain.

In the energy absorbing member 7 as described above, the energy absorbing member 7 is controlled by the regulating member 11 so that
6, the energy absorbing member 7
Can be restricted between the restricting members 11 to suppress deformation in directions other than the arrow direction.

For this reason, as shown in FIGS. 3 and 5, the regulating member 11 has a shape substantially coincident with the planar shape of the energy absorbing member 7 at the position where the regulating member 11 is to be mounted, and It is formed of a steel material having a higher yield point and a higher strength than the member 7 and is configured to exhibit high bending rigidity.

In the elasto-plastic energy absorber A configured as described above, when the seismic force of the building acts, the seismic force is transmitted from the beams 1 and 2 to the columns 3 and 4 constituting the frame,
The energy is transmitted to the energy absorbing member 7 via the vertically long members 5 and 6. At this time, the energy absorbing member 7 deforms within the elastic limit or plastically exceeds the elastic limit in accordance with the magnitude of the transmitted force, and absorbs the energy required for these deformations.

Therefore, when the transmitted seismic energy is large, the energy absorbing member 7 can be plastically deformed and absorb the seismic energy. In addition, since seismic force is transmitted to the energy absorbing members 7 through the elongated longitudinal members 5 and 6, a large concentrated load does not act on the columns 3 and 4. , The function of the energy absorbing member 7 can be rationally exhibited.

After the earthquake, the energy absorbing member 7 is confirmed, the plastically deformed absorbing member 7 is removed from the elongated members 5 and 6, and a new energy absorbing member 7 is attached to restore the initial state. It is possible to return.

In the first embodiment described above, an example is described in which the elasto-plastic energy absorber A is constructed by attaching the vertically elongated members 5 and 6 divided into columns 3 and 4 and attaching four energy absorbing members 7. , The number of energy absorbing members 7 is 4
The present invention is not limited to the individual pieces, but can be set appropriately in accordance with the seismic energy to be absorbed.

FIG. 6 is a view for explaining the configuration of the elasto-plastic energy absorber A according to the second embodiment. In this embodiment, two vertically elongated members 5 and 6 are respectively attached to a pair of columns 3 and 4 constituting a frame by bolts 8, and six energy absorbing members are inserted through the vertically elongated members 5 and 6. 7 are attached at substantially equal intervals. The distance between the energy absorbing member 7 and the bolt 8 is approximately 略 of the distance between the energy absorbing members 7. By arranging the energy absorbing members 7 on the vertically long members 5 with such an interval, the rigidity of the entire elastic-plastic energy absorber A can be increased.

Even when the elasto-plastic energy absorber A is configured as described above, it is possible to absorb seismic energy in the same manner as in the first embodiment. However, in this embodiment, the first energy absorbing member 7 is increased by the number of the energy absorbing members 7.
It is possible to absorb larger seismic energy than in the case of the embodiment.

FIG. 7 relates to an elastic-plastic energy absorber A according to the third embodiment. In the figure, the vertical members 5,
Reference numeral 6 has a length substantially equal to that of the main bodies 3c, 4c of the columns 3, 4, and is attached to the surfaces 3a, 4a by means such as welding. Seven energy absorbing members 7 are arranged at substantially equal intervals, and are detachably attached to the vertically long members 5 and 6, respectively.

The elasto-plastic energy absorber A configured as described above can absorb seismic energy in the same manner as in the first and second embodiments.

[0041]

As described above in detail, in the elasto-plastic energy absorber according to the present invention, a vertically long material is attached to a pair of columns arranged between the upper and lower beams, and a plurality of energy absorbing members are arranged on the vertically long material. As a result, seismic energy can be absorbed.

By appropriately setting the number of energy absorbing members, the energy that can be absorbed can be adjusted to a desired value, and the proof strength and rigidity required for the elasto-plastic energy absorber can be easily obtained. .

Further, since it is composed of a pair of columns, a vertically long material, and an energy absorbing member detachable from the vertically long material, it can be easily formed even between narrow columns. For this reason, the degree of freedom of choreography of the seismic elements in the building can be improved.

Furthermore, since the energy absorbing member that has been plastically deformed by absorbing seismic energy is configured independently of other members, it is sufficient to simply replace only the energy absorbing member during repair after an earthquake. It is possible to realize repair at low cost.

As described above, the elasto-plastic energy absorber of the present invention can be easily formed even in a narrow portion and can be easily repaired after an earthquake. This is a very low-rise house, which is extremely effective as a large-sized garage and large-opening that can be installed to absorb seismic energy.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a configuration of an elastic-plastic energy absorber according to a first embodiment.

FIG. 2 is a view for explaining the configuration of the elasto-plastic energy absorber, and is a view taken along the line II-II in FIG.

FIG. 3 is a diagram illustrating a state where an energy absorbing member is attached to a frame body.

FIG. 4 is a three-view drawing illustrating a configuration of an energy absorbing member.

FIG. 5 is a diagram illustrating a configuration of a regulating member.

FIG. 6 is a diagram illustrating a configuration of an elastic-plastic energy absorber according to a second embodiment.

FIG. 7 is a diagram illustrating a configuration of an elastic-plastic energy absorber according to a third embodiment.

FIG. 8 is a diagram illustrating a first public example.

FIG. 9 is a diagram illustrating a second known example.

[Explanation of symbols]

A elastic-plastic energy absorbers 1, 2 beams 3, 4 pillars 3a, 4a surfaces 3b, 4b connecting members 3c, 4c main body portion 5, 6 vertically long members 7 energy absorbing members 7a main body portion 7b bending portions 7c, 7d bolt holes 8, 9a, 10a Bolt 9b, 10b Nut 11 Restriction member

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) F16F 15/02 F16F 15/02 Z

Claims (1)

[Claims] 1. A vertically arranged beam, a pair of columns arranged adjacent to each other between the beams, a vertically elongated member attached to opposing surfaces of the pair of columns, An elastic-plastic energy absorber, comprising: a plurality of energy absorbing members detachably attached.