JPH08326154A - Column-beam joining part having energy absorbing mechanism - Google Patents

Abstract

PURPOSE: To absorb vibration energy so as to restrain vibration of a building by installing fitting plates in the direction of the axis of a member of a flange intersecting part of a column and a beam of a column-beam joining part in such a manner as to be parallel to the web of the column or the beam in the form of a haunch to the relatively displaced, and making a visco-elastic body sheet adhere to the fitting plates. CONSTITUTION: A fitting plate 3 is disposed in the direction of the axis of a member of the intersecting part of flanges 2a, 1a of a column 1 and a beam in such a manner as to be parallel to the web of the beam 2, and installed in the form of a haunch to be relatively displaced. At that time, there is provided a gap P for permitting displacement. Also on the lower side of the beam 2 of the inside flange 1a of the column 1, a fitting plate 4 is disposed in parallel to the direction of the axis of the member in the middle position between the fitting plate 3 and integrally installed. Thus, when vibration energy like an earthquake is applied to the joining part of the column beam, the fitting plates 3, 4 are relatively displaced in parallel. A visco- elastic body sheet 5 is interposed between the fitting plates 3, 4. By this arrangement, vibration energy is absorbed as shearing energy. Thus, vibration damping design taking energy absorption into consideration can be achieved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a beam-column joint having an energy absorbing mechanism for absorbing vibration energy and suppressing vibration of a building, which is implemented in a beam-column joint of a building structure.

[0002]

2. Description of the Related Art Conventionally, the following have been known and implemented as seismic-resistant column-beam joints that absorb vibration energy and suppress building vibrations in the column-beam joints of a building structure. A mechanism to obtain a restoring force characteristic with large damping by laminating an extremely mild steel material having a much lower yield point than the base material at the column and beam end of the beam-column joint, and plasticizing the extremely mild steel material at the time of an earthquake. Kaihei 4
-1373, JP-A-4-297674, JP-A-5-
See the invention described in Japanese Patent No. 156839). A mechanism that enhances the toughness of the frame by joining the beam end of the beam-column joint with an end plate that plastically deforms before the local buckling of the beam (Japanese Patent Publication No. 63-53340, JP-B1-1368).
2). The following is known as a vibration energy absorbing mechanism using a viscoelastic body or lead. (a) JP-A-4-9204
Japanese Unexamined Patent Publication No. 0 (1999) discloses a damping beam equipped with a damping device having a structure in which a plurality of long steel plates and a viscoelastic material are attached to the lower surface of a beam member and laminated so as to be displaceable in the longitudinal direction. Has been done.
(b) Japanese Patent Application Laid-Open Nos. 1-97764 and 3-1070
In Japanese Patent Publication No. 74 etc., a device for obtaining a damping force by filling a viscous material between a vertical plate (or inner wall) hanging from a beam (or upper floor) and a container (or outer wall) mounted on the wall is described. ing. (c) Japanese Patent Laid-Open No. 3-25173 discloses a structure in which a beam and a precast concrete partition wall are connected by a vibration damping device having a viscoelastic body interposed between a plurality of steel plates. (d) JP-A-2-164984, JP-A-3-125764, etc. describe a structure in which a pin made of lead or a lead alloy is fitted between vertically adjacent blocks to form a vibration damping device. .

[0003]

[Problems to be Solved by the Present Invention]

I) According to the above energy absorbing mechanism, it is possible to absorb the vibration energy as plastic energy and suppress the vibration of the building. However, with this mechanism, it is not possible to sufficiently secure the formation from the neutral axis to the ultra-soft steel material, so it is not possible to give a high plasticity rate to the ultra-soft steel material, and the damping effect is small. For example, considering the case where the upper flange of the beam forms a composite beam with the floor slab, and the ultra-soft steel material is laminated only on the lower flange, the bending moment at the cross-sectional position (bending moment within the elastic limit of the base material) is small, You cannot expect a large energy absorption capacity. In addition, the rigidity of ultra-soft steel should be considered in the evaluation of the rigidity of the entire building, which affects the balance of forces. The current seismic design method does not, in principle, allow such members to yield at the primary design level, and requires rigorous consideration before use. II) Next, the above-mentioned energy absorption mechanism is intended for a small building frame, and is difficult to apply to a large-scale building frame targeted by the present invention. Also, once the end plate has undergone plastic deformation, it is not possible to expect vibration energy absorption due to repeated displacement. III) Of the above vibration energy absorption mechanisms, (a) is intended for vertical vibration of the floor surface and does not contribute to improvement of seismic resistance. In addition, in the cases (b) to (d), a wall is required for mounting and arranging the device, which impairs the degree of freedom in construction planning, and it is difficult to arrange the device in terms of structural planning.

Therefore, an object of the present invention is to achieve a sufficiently large energy absorption even if the base material portion is in an elastic state, and to reduce the response to external force at the primary design level.
That is, the effect of suppressing the vibration of the building can be expected, and the energy balance mechanism that is effective in the structural design and can be desirably arranged from the architectural plan and the structural plan with almost no influence on the balance of forces of the entire building is provided. Is to provide a beam-column joint.

[0005]

As a means for solving the above-mentioned problems, the invention of claim 1 is a pillar-beam joint part of a building structure in which a pillar and a beam are rigidly joined to form a rigid frame, In the material axis direction of the column of the beam joint and the flange intersection of the beam, the mounting plate that displaces in unison with the column material or beam material is arranged in parallel with the web of the column or beam into a haunch shape in which each is relatively displaced. It is characterized in that a viscoelastic body sheet is adhered between the mounting plates of the mounting member, the pillar member and the beam member.

The mounting plate described in claim 1 is formed of a metal flat plate member or a T-shaped or L-shaped member in which the flange is relatively displaced along the oblique side of the right-angled triangular haunch shape. . According to a third aspect of the present invention, in a column-beam joint portion of a building structure in which a column and a beam are rigidly joined to form a rigid frame, a pillar material or Attach the mounting plate that is displaced in unison with the beam to the haunch shape where each is relatively displaced in the arrangement parallel to the web of the column or beam, and in the direction perpendicular to the plate surface between the mounting plate of the column and beam. It is characterized by penetrating a rod-shaped lead plug in a specially cut state.

[0007]

When vibration energy due to an earthquake, wind, or the like acts on the beam-column joint portion of the present invention, and relative displacement occurs between the column members and the mounting plates of the beam members, the inventions of claims 1 and 2 The elastic sheet causes the same shear deformation as the displacement in the thickness direction thereof to exert an energy absorbing action. Further, in the case of the invention of claim 3, the lead plug causes the same shear deformation as the relative displacement between the mounting plates, thereby exerting the effect of absorbing plastic energy.

[0008]

EXAMPLE An example of the present invention shown in the drawings will be described below.
1 to 3 are column-beam joints of a building structure in which a steel-framed column 1 having an H-shaped cross section and a steel-framed beam 2 having the same H-shaped cross-section are rigidly joined to form a ramen, and a viscoelastic sheet It shows an embodiment provided with an energy absorption mechanism using. That is, beam 2
4 sheets formed in the shape of a right-angled triangle haunch that inclines in the material axis direction from the intersection of the lower flange 2a with the column flange 1a in the material axis direction, and in the material axis direction when the flat steel plate is viewed in the front direction. For convenience of description, the number is four, but the number is actually larger.
Are arranged in parallel with the web of the beam 2 and are integrally attached by, for example, welding, with an appropriate space between each surface. It should be noted that the mounting plate 3 is provided with a gap p between the flange 1a of the column 1 and the displacement p that allows displacement due to vibration. On the other hand, on the beam lower side of the inner flange 1a of the pillar,
Again, three flat plates (thus, in actuality, n-1 in the case of the above example), which are formed in the substantially same haunch shape, are mounted between the mounting plates 3 on the beam side. At the intermediate position, also arranged in parallel to the material axis direction from the beam end, and secured to a gap of an appropriate size, they are integrally attached to the flange 1a of the column by welding. And 4 are configured to be relatively displaced in parallel when vibration energy due to an earthquake or wind acts on the column-beam joint.

The pillar-side mounting plate 4 is provided with a space s between the lower flange 2a of the beam 2 and the displacement sufficient to allow displacement due to vibration. Then, a viscoelastic sheet 5 having the same thickness as each space is provided between the two kinds of mounting plates 3 and 4 by being adhered to each mounting plate 3 and 4. As a concrete material of the viscoelastic body sheet 5, for example, a well-known high damping rubber-based material having a large damping performance which is adopted in a vibration damping means of a building, and its thickness is used in a range of 3 to 10 mm. .

As an actual construction method, the two types of mounting plates 3 and 4 and the viscoelastic sheet 5 adhered between them are
It is produced in a factory as a unit of an energy absorption mechanism, and is welded to a pillar or beam steel frame at a building construction work site (site) or a steel frame assembly factory, or bolted via a joint plate. In the figure, reference numeral 6 is a floor slab, and 7 is a stiffener for reinforcement.

According to the beam-column joint of the present embodiment, two types of mounting plates are provided at the beam end where a relatively large stress is generated when a horizontal external force such as an earthquake or wind load causes deformation. By utilizing the relative displacements of 3 and 4, the viscoelastic body sheet 5 efficiently absorbs the vibration energy as shear energy (plastic energy) and exerts a vibration damping effect. In other words, the effect of reducing the response to the external force at the primary design level (the external force assuming the use limit state) can be expected.

[0012]

Second Embodiment Next, a second embodiment shown in FIGS. 4 to 6 shows a beam-column joint portion having an energy absorbing mechanism which also uses a viscoelastic body sheet. However, in the case of the present embodiment, the mounting plate 8 on the beam side has a haunch shape of a right-angled triangle in the basic shape seen in the front direction, but the hypotenuse thereof is shown in FIG.
As shown in FIG. 6, it has a T-shaped steel shape and its web portion 8
a is welded to the lower flange 2a of the beam 2 in the material axis direction in a position parallel to the web of the beam. On the other hand, the mounting plate 9 on the pillar side also has a haunch shape of a right-angled triangle when viewed in the front direction, but the hypotenuse part thereof has an L-shaped steel shape as shown in FIGS. The web portion 9a is arranged in the material axis direction of the beam 2 in parallel with the web of the beam, and is welded to the inner flange 1a of the column 1. Then, a viscoelastic sheet 5 having the same thickness as the interval is provided between the two kinds of mounting plates 8 and 9 in an L shape by adhering to each mounting plate 3 and 4.

Therefore, also in the case of the present embodiment, when the column-beam joint is deformed by a horizontal external force such as an earthquake or wind load, the relative displacement between the two types of mounting plates 8 and 9 is utilized, The viscoelastic body sheet 5 efficiently absorbs the vibration energy as shearing energy (plastic energy) and exerts a vibration damping effect.

[0014]

[Third Embodiment] In the case of the embodiment shown in FIGS. 7 to 9, mounting plates 10 and 11 attached to the columns 1 and 2 of the beam-column joint portion.
Is the same as the first embodiment in that the basic shape when viewed from the front is a right-angled triangle haunch shape.
However, in the case of this embodiment, each of the two kinds of mounting plates 10 and 11 is considerably thick, and the number of the mounting plates 11 on the beam side is two, and one mounting plate 10 on the column side is in the middle thereof. Have been combined. A plurality of rod-shaped lead plugs 12 are formed in the direction perpendicular to the plate surface between the two types of mounting plates 10 and 11.
Are arranged at an appropriate pitch over substantially the entire plate surface, and are attached so as to penetrate so as to be sheared by the relative displacement of the two types of mounting plates 10 and 11. By the way,
The distance between the mounting plates 10 and 11 is set to a width (for example, about 1/2 or less of the diameter of the lead plug) at which the deformation of the lead plug 12 is considered to be shear deformation. The diameter and the number of lead plugs are determined so that the required cross-sectional area, which is determined by the yield strength of the lead plugs, is appropriately arranged over substantially the entire area of the mounting plate.

Therefore, in the case of this embodiment, when the column-beam joint is deformed by a horizontal external force such as an earthquake or a wind load, the lead plug is subjected to the relative displacement of the two kinds of mounting plates 10 and 11. 12 causes shear deformation, efficiently absorbs vibration energy as shear energy (plastic energy), and exerts a vibration damping effect.

[0016]

The present invention has a construction in which a vibration energy absorbing mechanism is attached to a beam or a column of a beam-column joint in a haunch shape. Therefore, a wall, a brace, a stud or the like is not required to attach the mechanism. Since it is not restricted by the construction plan, it can be installed in a large number in a frame of a building structure in a well-balanced manner and is highly practical.

Since the rigidity of the viscoelastic body is very small and lead has a stress relaxation property, when the present invention is adopted, the force balance of the entire building is hardly affected.
In addition, after receiving an external force at the primary design level, residual deformation does not occur, or even if it occurs, it returns to the original position relatively quickly.
This allows seismic design considering energy absorption, under the current regulation of the seismic design method.

In the beam-column joint of the present invention, the energy absorption mechanism effectively absorbs the vibration energy and suppresses the vibration of the building when a horizontal external force such as an earthquake or a wind load is received in view of the structural plan. Allows economical cross-sectional design. According to the present invention, since the energy absorbing mechanism effectively absorbs a large amount of vibration energy while keeping the base material portion at the elastic limit, economical design is possible. As a result, it is possible to fully expect the effect of reducing the response to the external force at the primary design level.

[Brief description of drawings]

FIG. 1 is a front view showing a beam-column joint portion according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view taken along line AA of FIG.

FIG. 3 is an enlarged sectional view of an energy absorbing mechanism portion.

FIG. 4 is a front view showing a beam-column joint portion according to a second embodiment of the present invention.

5 is a cross-sectional view taken along the line AA of FIG.

FIG. 6 is an enlarged sectional view of an energy absorbing mechanism portion.

FIG. 7 is a front view showing a beam-column joint portion according to a third embodiment of the present invention.

8 is a cross-sectional view taken along the line AA of FIG.

FIG. 9 is an enlarged cross-sectional view of an energy absorbing mechanism portion.

[Explanation of symbols]

 1 column 1a column flange 2 beam 2a beam flange 3 mounting plate 4 mounting plate 5 viscoelastic body sheet 8 mounting plate 9 viscoelastic body sheet 10 mounting plate 11 viscoelastic body sheet 12 lead plug

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Taketsugu Kitahara 1-5 Otsuka, Inzai-cho, Inba-gun, Chiba Prefecture Takenaka Corporation Technical Research Institute (72) Inventor Hiroshi Kaneko 1-5 Otsuka, Inzai-cho, Inba-gun, Chiba Prefecture Ban Co., Ltd. Takenaka Corporation Technical Research Institute (72) Inventor Toshio Nagashima 1-5, Otsuka, Inzai-cho, Inba-gun, Chiba Prefecture Takenaka Corporation Technical Research Institute

Claims (3)

[Claims] 1. In a column-beam joint of a building structure in which a column and a beam are rigidly joined to form a rigid frame, in the axial direction of the column intersection of the column-beam joint and the flange of the beam,
A mounting plate that displaces in unison with a pillar or beam is attached in a haunch shape in which each is relatively displaced in parallel with the web of the pillar or beam, and viscoelastic between the mounting plates of the pillar and beam. A beam-column joint having an energy absorbing mechanism, characterized in that a body sheet is adhered. 2. The mounting plate according to claim 1 is formed of a metal flat plate member or a T-shaped or L-shaped member in which a flange relatively displaces along an oblique side of a right-angled triangular haunch shape. A beam-column joint having an energy absorbing mechanism, which is characterized in that 3. In a column-beam joint of a building structure in which a column and a beam are rigidly joined to form a rigid frame, in the axial direction of the column intersection of the column-beam joint and the flange intersection of the beam,
A mounting plate that displaces in unison with a pillar or beam is mounted in a haunch shape such that each of them displaces relative to each other in an arrangement parallel to the web of the pillar or beam, and the plate surface between the mounting plates of the pillar and the beam. A column-beam joint equipped with an energy absorbing mechanism, characterized in that a rod-shaped lead plug is penetrated in a shearing state in a direction perpendicular to.