JP2010236218A - Shaft member joint structure of building using perforated steel plate dowel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a shaft member joint structure of a building using a perforated steel plate dowel, which can obtain a vibration control effect by enabling a portion for being joined by the perforated steel plate dowel to function as a hysteretic damper. <P>SOLUTION: This shaft member joint structure includes the perforated steel plate dowel 1, a reinforced concrete body 2A in which the perforated steel plate dowel 1 is placed in an embedded state, and the shaft member 3 which is joined to the perforated steel plate dowel 1. In this constitution, the shear strength of concrete is set higher than the strength of the perforated steel plate dowel. More specifically, when a great shearing force acts between the perforated steel plate dowel 1 and the reinforced concrete body 2A, the perforated steel plate dowel 1 yields ahead of the shear fracture of the concrete. Thus, the shaft member joint structure functions as the hysteretic damper against shaking caused by earthquakes etc., and obtains the vibration control effect. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a structure for joining shaft members of a building using a perforated steel plate diver.

In order to join a shaft member such as a brace to a reinforced concrete body such as a reinforced concrete column or a reinforced concrete beam of a building, a perforated steel plate dowel may be interposed as a slip stopper. In this case, a perforated steel plate dowel is joined to a part of the gusset plate by welding or the like. Concrete is cast with this perforated steel plate gibber embedded, and a reinforced concrete body is constructed. For example, a brace which is a shaft member is joined to the gusset plate.
According to said shaft member joining structure, when the concrete of a reinforced concrete body enters into the hole of a perforated steel plate dowel, an anti-slipping action is obtained and the strength of the joint can be increased.

  In addition, about the brace provided diagonally between the pillar and beam of a structure, what is used as a hysteretic damper by buckling restraint is proposed.

JP 2008-088639 A JP 2007-132524 A

  In a normal design using perforated steel plate dowels, the yield of the perforated steel plate dowels is prevented from occurring prior to the shear failure of the concrete entering the holes. For this reason, the joint part using the said perforated steel plate dowel cannot obtain the vibration damping effect. Further, the idea of obtaining a vibration damping effect by utilizing a joint portion with a perforated steel plate gibber has never been known.

  An object of the present invention is to provide a shaft member joining structure for a building using a perforated steel plate gibel that can function as a hysteretic damper by using a joined portion by a perforated steel plate diver and obtain a vibration damping effect. is there.

The shaft member joining structure of a building using a perforated steel plate gibel according to the present invention includes a perforated steel plate diver, a reinforced concrete body in which the perforated steel plate diver is embedded, and a shaft member joined to the perforated steel plate divel. In the shaft member joint structure of the building using the perforated steel plate gibber provided,
A perforated steel plate gibel proof strength, which is a resistance against the yielding of the perforated steel plate gibel due to the shearing force generated between the perforated steel plate gibel and the reinforced concrete body along the direction along the surface of the perforated steel plate gibel,
The relationship with the concrete shear strength, which is the strength against the occurrence of shear fracture in or near the part of the reinforced concrete body that enters the hole of the perforated steel plate gibber,
(Concrete shear strength)> (Perforated steel plate gibber strength)
It is characterized by that.

  According to this shaft member joint structure, since (concrete shear strength)> (perforated steel plate gibber strength), when a large shearing force acts between the perforated steel plate gibber and the reinforced concrete body, The perforated steel plate gibber yields ahead. Since the perforated steel plate gibber is embedded in the reinforced concrete body, it can be considered that it is buckled. For this reason, it is thought that the joint part by a perforated steel plate gibber exhibits a high energy absorption capability as a hysteretic damper. Thereby, it becomes a shaft member joining structure with a high damping effect. The hysteretic damper is a damper that absorbs and dissipates vibration energy such as seismic energy by hysteretic damping caused by plastic deformation of steel or the like.

  In the present invention, an unbonded material layer may be provided between the surface of the perforated steel plate gibber and the reinforced concrete body. Thus, the effect of absorbing the vibration energy as the hysteretic damper can be stabilized by cutting the adhesion between the surface of the perforated steel plate gibber and the reinforced concrete body with the unbonded material layer interposed. In addition, in the design of the slip prevention using the perforated steel plate dowel, the resistance force due to the adhesion between the surface of the perforated steel plate dowel and the reinforced concrete body is not considered, and the concrete intervenes in the hole of the perforated steel plate dowel, Calculate the anti-slipping effect. For this reason, even if the adhesion between the surface of the perforated steel plate gibel and the reinforced concrete body is cut with an unbonded material layer interposed, there is no problem of reducing the effect of preventing the shift as the diver.

  In this invention, the shaft member is a brace, the reinforced concrete body is a beam or a column, and the brace is attached to the perforated steel plate gibel or a gusset plate formed as an integral member with the perforated steel plate gibel. May be joined. When the shaft member joined to the perforated steel plate gibel is a brace, that is, a diagonal member, the vibration of the building mainly acts as a repeated axial force of a tensile force and a compressive force on the brace. This axial force acts as a shearing force between the perforated steel plate dowel and the reinforced concrete body. According to the present invention, the vibration energy absorbing effect as the above-mentioned hysteretic damper can be favorably obtained with respect to the vibration transmitted in this way.

  In this invention, the shaft member may be a stud, and the reinforced concrete body may be a beam, a foundation, or a floor slab. When the shaft member is a stud, it is deformed so that the stud is inclined due to an interlayer displacement of the building due to an earthquake or the like. Therefore, a shearing force is generated between the perforated steel plate gibber and the reinforced concrete body by a force obtained by synthesizing the axial force acting on the stud and the force to be inclined and deformed. The vibration energy absorbing effect as the hysteretic damper can be favorably obtained even for the vibration transmitted in this way.

The shaft member joining structure of the building using the perforated steel plate gibel according to the present invention includes a perforated steel plate diver, a reinforced concrete body in which the perforated steel plate diver is embedded, and a shaft member joined to the perforated steel plate divel. In a shaft member joint structure of a building using a perforated steel plate gibber with a yielding to a perforated steel plate diver due to the shearing force generated between the perforated steel plate jebel and the reinforced concrete body along the direction along the surface of the perforated steel plate gibber The relationship between the perforated steel plate gibber strength, which is the strength against the occurrence of cracks, and the concrete shear strength, which is the strength against the occurrence of shear fracture in or near the portion of the reinforced concrete body that enters the hole of the perforated steel plate gibel,
(Concrete shear strength)> (Perforated steel plate gibber force)
Therefore, the joint portion by the perforated steel plate gibber can function as a hysteretic damper, and a vibration damping effect can be obtained.

BRIEF DESCRIPTION OF THE DRAWINGS It is a front view of the shaft member junction structure of the building using a perforated steel plate gibber concerning 1st Embodiment of this invention. It is an enlarged view of the A section in FIG. It is a partial expanded sectional view of a perforated steel plate gibber. It is a front view of the shaft member junction structure of the building using a perforated steel plate gibber concerning other embodiments of this invention. It is a front view of the shaft member junction structure of the building using a perforated steel plate dowel concerning further another embodiment of this invention. It is a front view of the shaft member junction structure of the building using a perforated steel plate dowel concerning further another embodiment of this invention.

  A first embodiment of the present invention will be described with reference to FIGS. This shaft member joining structure of a building using a perforated steel plate gibber is an example in which the perforated steel plate gibber 1 is used for the connection between the reinforced concrete body 2A as a beam and the shaft member 3 as a brace. The reinforced concrete body 2A which is a beam is joined between the reinforced concrete bodies 2B which are two adjacent columns. These reinforced concrete bodies 2A and 2B, which are beams or columns, may be those cast on site or may be precast concrete. The perforated steel plate gibber 1 is embedded in the concrete together with the reinforcing bar 6 at the time of concrete placement of the reinforced concrete body 2A which is a beam.

In FIG. 1, the shaft member 3 that is a brace is between a joint portion of a reinforced concrete body 2A that is a beam and a reinforced concrete body 2B that is a column and a central portion of the reinforced concrete body 2A that is a beam on the upper floor. Are arranged in an inclined posture. Both ends of the shaft member 3 are joined to a gusset plate 4 which is a member integrated with the perforated steel plate gibber 1. The perforated steel plate gibber 1 and the gusset plate 4 may be provided separately and joined to each other. The shaft member 3 which is two braces arranged symmetrically to each other is joined to the gusset plate 4 in the center of the reinforced concrete body 2A which is a beam.
The shaft member 3, which is a brace, has joint portions at both ends, and the joint portions are overlapped on the gusset plate 4 and bolted together, and are friction bolted. The shaft member 3 that is a brace is, for example, a buckling restraint brace, and is composed of a steel core member having joint portions at both ends and a restraint member that sandwiches the core member. The shaft member 3 that is a brace may be made of a single steel material such as a shape steel or a round bar.

  FIG. 2 shows an enlarged view of part A in FIG. As shown in the figure, the gusset plate 4 at the end of the pillar has an H-shaped cross section having a stiffener 4a at one end along the reinforced concrete body 2B as the pillar and the other end opposite to the one end. . The stiffener 4a is provided only in the portion of the gusset plate 4, and is not provided in the portion of the perforated steel plate gibber 1.

  As shown in an enlarged cross-sectional view in FIG. 3, each hole 5 of the perforated steel plate dowel 1 is filled with concrete 7 when the concrete A of the reinforced concrete body 2 </ b> A is placed. The perforated steel plate gibber 1 is not limited as long as a plurality of holes are provided in the steel plate, and the number and arrangement of the holes and the type of steel material are not particularly limited.

That is, a strong tensile force or a compressive force may repeatedly act on the shaft member 3 (FIG. 1) that is a brace due to the vibration caused by an earthquake or the like. Due to such pulling force and compressive force, a shearing force acts between the perforated steel plate gibber 1 and the reinforced concrete body 2A along the direction along the surface of the perforated steel plate gibber 1.
When this shearing force is increased, yielding occurs in the non-hole portion a (FIG. 3) between the adjacent holes 5 of the perforated steel plate gibel 1 and in the non-hole portion between the hole 5 and the edge of the diver. Further, a shear fracture occurs in a portion (b portion in FIG. 3) that enters the hole 5 of the perforated steel plate dowel 1 in the concrete 7 of the reinforced concrete body 2A or in the vicinity thereof.
The yield strength of the perforated steel plate gibel 1 against the yielding is referred to as “perforated steel plate gibel strength”, and the strength against shear fracture of the concrete 7 is referred to as “concrete shear strength”. Here, the relationship between these two proof stresses is
(Concrete shear strength)> (Perforated steel plate gibber strength)
And
The “perforated steel plate gibber yield strength” is the strength of the weakest part with respect to the shearing force in the perforated steel plate gibel 1, for example, the yield strength of the minimum cross-sectional portion of the perforated steel plate diver 1. The “concrete shear strength” is the strength of the portion where shear fracture is most likely to occur with respect to the shear force.

  Moreover, in this embodiment, the unbond material layer 8 is provided between the surface of the perforated steel plate gibber 1 and the reinforced concrete bodies 2A and 2B. The unbond material layer 8 is provided, for example, by unbonding the entire surface on both sides of the perforated steel plate gibber 1. As the material of the unbond material layer 8, viscoelastic materials such as asphalt and asphalt polymers, butyl rubber, and the like are used.

According to this shaft member joining structure, axial forces such as a large tensile load and a compressive load may repeatedly act on the shaft member 3 that is a blade due to vibration such as an earthquake. Due to the axial force acting on the shaft member 3, a large shearing force may repeatedly act between the concrete 7 of the reinforced concrete body 2A, which is a beam, and the surface of the perforated steel plate gibber 1. For this shear force, (Concrete shear strength)> (Perforated steel plate gibber strength)
Therefore, the perforated steel plate gibber yields prior to the shear fracture of concrete.
Since the perforated steel plate gibber 1 is embedded in the concrete 7 of the reinforced concrete body 2A, it can be considered to be buckled. For this reason, the joint part by the perforated steel plate gibber 1 exhibits a high energy absorption capability as a hysteretic damper. Therefore, it becomes a shaft member joining structure with a high damping effect.

  In this embodiment, since the unbonded material layer 8 is provided on the perforated steel plate gibber 1 and the adhesion with the concrete 7 is cut off, more stable energy absorption performance is exhibited. In addition, in the design of the slip prevention using the perforated steel plate gibel 1, the resistance force due to the adhesion between the surface of the perforated steel plate gibel 1 and the reinforced concrete body 2A is not considered, and the concrete 7 The effect of the slip prevention is calculated by intervening. Therefore, even if the adhesion between the surface of the perforated steel plate gibber 1 and the reinforced concrete body 2A is cut with the unbond material layer 8 interposed, there is no problem of reducing the effect of preventing the shift as the diver.

FIG. 4 shows another embodiment of the present invention. In the embodiment shown in FIGS. 1 to 3, the shaft member joining structure of the building using the perforated steel plate gibber includes the shaft member 3, the middle part of the reinforced concrete body 2 </ b> B that is a column, and the middle part of the reinforced concrete body 2 </ b> A that is a beam. A brace type brace placed in an inclined position between the two. Other configurations such as joining both ends of the shaft member 3 to a gusset plate 4 formed as a member integral with the perforated steel plate gibber 1 are the same as those in the embodiment of FIGS.
Also in this case, similarly to the above-described embodiment, the joined portion by the perforated steel plate gibber 1 can function as a hysteretic damper, and a vibration damping effect can be obtained. Further, since the shaft member 3 is a cane type brace, the buckling length of the shaft member 3 can be shortened.

FIG. 5 shows still another embodiment of the present invention. In the embodiment of FIGS. 1 to 3, the shaft member joining structure of the building using the perforated steel plate gibber is a stud that is erected between the reinforced concrete beams on the upper and lower floors that are the reinforced concrete bodies 2 </ b> C. Is. A perforated steel plate dowel 1 is joined to both ends of a shaft member 3 that is a stud. The reinforced concrete body 2C may be a floor slab.
In this case, the shaft member 3 functions as a stud-type damper and exhibits a damping effect. When the shaft member 3 is a stud, it is deformed so that the stud is inclined by an interlayer displacement of a building due to an earthquake or the like. Therefore, a shearing force is generated between the perforated steel plate gibber 1 and the reinforced concrete body 21C by a force obtained by synthesizing the axial force acting on the stud and the force to be inclined and deformed. The vibration energy absorbing effect as the hysteretic damper can be favorably obtained even for the vibration transmitted in this way. Other configurations and effects are the same as those of the embodiment of FIGS.

  FIG. 6 shows still another embodiment of the present invention. The shaft member joining structure of a building using a perforated steel plate gibber is a reinforced concrete foundation in which the lower floor side reinforced concrete body 2D is used in the embodiment of FIG. In this case, the perforated steel plate gibber 1 embedded in the reinforced concrete body 2D which is a reinforced concrete foundation serves as a column base embedded portion of the shaft member 3 which is a stud. Other configurations and effects are the same as those of the embodiment of FIG.

DESCRIPTION OF SYMBOLS 1 ... Perforated steel plate gibel 2A-2D ... Reinforced concrete body 3 ... Shaft member 4 ... Gusset plate 5 ... Hole 7 of perforated steel plate gibel ... Concrete 8 ... Unbonded material layer

Claims (4)

In the shaft member joint structure of a building using a perforated steel plate gibber comprising a perforated steel plate gibbel, a reinforced concrete body in which the perforated steel plate gibber is embedded, and a shaft member joined to the perforated steel plate gibber,
A perforated steel plate gibel proof strength, which is a resistance against the yielding of the perforated steel plate gibel due to the shearing force generated between the perforated steel plate gibel and the reinforced concrete body along the direction along the surface of the perforated steel plate gibel,
The relationship with the concrete shear strength, which is the strength against the occurrence of shear fracture in or near the part of the reinforced concrete body that enters the hole of the perforated steel plate gibber,
(Concrete shear strength)> (Perforated steel plate gibber strength)
The shaft member joint structure of a building using a perforated steel plate gibber characterized by the above.   The shaft member joining structure of a perforated steel plate gibber-processed building according to claim 1, wherein an unbonded material layer is provided between the surface of the perforated steel plate diver and the reinforced concrete body.   3. The shaft member according to claim 1 or 2, wherein the shaft member is a brace, the reinforced concrete body is a beam or a column, and is joined to the perforated steel plate gibber or integrated with the perforated steel plate gibber. A shaft member joining structure of a building using a perforated steel plate gibber in which the brace is joined to a gusset plate.   The shaft member joint structure according to claim 1 or 2, wherein the shaft member is a stud and the reinforced concrete body is a beam, a foundation, or a floor slab.

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