JP2012007384A - Junction structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a junction structure of a reinforced concrete column capable of effectively preventing bearing failure and shear slip failure.SOLUTION: A junction structure 1 is a junction structure of a column member 10 of reinforced concrete construction and a support skeleton 20 of reinforced concrete construction for supporting the column member 10. A recess 21 is formed at a top face of the support skeleton 20, and a column base part of the column member 10 is fitted into the recess 21 to form a joint part 40. On a surface side of the support skeleton 20 in the joint part 40, a groove 41 is provided to block force transmitted between an inner wall surface 23 of the recess 21 and a lateral face on a column base part side of the column member 10.

Description

  The present invention relates to a joint structure between a reinforced concrete column and a support frame that supports the column.

Conventionally, in a precast reinforced concrete structure, for example, a column, a beam, and a slab are manufactured as a column member, a beam member, and a slab member at a factory, and each member is transported to the site and joined together.
Among them, the column member 110 is bonded to a column-beam joint, a slab, or a support housing 120 as a foundation, as shown in FIG.

A cylindrical joint hardware 111 is driven into the lower end of the column member 110, and the lower end edge of the joint hardware 111 is exposed from the lower end surface of the column member 110. Inside the joint hardware 111, the main bar 112 of the column member extends downward.
On the other hand, the main reinforcement 124 extends upward from the upper surface of the support housing 120. A spacer 127 is provided on the upper surface of the support housing 120.

  In such a structure, first, the column member 110 is moved close to the support housing 120 from above, and the main bar 124 of the support housing 120 is inserted into the joint hardware 111 so that the column member 110 is placed above the spacer. Put it on. Thereby, a gap is formed between the column member 110 and the support housing 120.

  Next, the grout mortar with high fluidity is filled in the gap between the column member 110 and the support housing 120 and the internal space of the joint hardware 111. The hardened grout mortar becomes the joint portion 126. The joint 126 is formed along the upper surface of the support housing 120.

  By the way, in recent years, high-strength concrete may be used as concrete. In this case, since the strength of the grout mortar to be filled is lower than the strength of the concrete, the joint portion 126 where the largest bending moment acts on the column member 110 is crushed, and as a result, the bending strength of the column member is high. It is determined not by the strength of concrete but by the strength of grout mortar.

  Therefore, it is conceivable that the strength of the grout mortar to be filled is higher than the concrete strength of the column member, but if the strength of the grout mortar is increased, the fluidity is lowered. Further, depending on the behavior of the building, the column member 110 may be required to have a yield strength that is greater than the flexural strength determined by the concrete strength.

In order to solve the above problems, the following methods have been proposed.
That is, as shown in FIG. 9, a method has been proposed in which a recess 121 is provided on the upper surface of the support housing 120 </ b> A, and a joint portion 126 is formed along the recess 121. (See Patent Document 1). The height of the upper surface of the joint portion 126 is flush with the upper surface of the support housing 120A.
According to this method, the joint portion 126 can be constrained by the concrete of the support housing 120A, so that the bending strength of the column member 110 can be improved.

  However, if the height of the upper end surface of the joint part 126 is flush with the upper surface of the support housing, the lower end part of the column member rotates, so that the bearing near the upper end surface of the joint part is damaged locally. Then, shear slip failure occurs in which the support frame near the upper end surface of the joint portion is broken.

  In addition, as a method for easily joining a precast reinforced concrete column to a foundation, a method has been proposed in which a precast reinforced concrete column is built in a recess provided in the foundation and the space surrounded by the recess and the precast reinforced concrete column is filled with mortar (patent) Reference 2). However, also in this case, since the height of the top surface of the mortar is flush with the top surface of the base portion, a bearing failure or shear slip failure occurs in the mortar and the base portion for the same reason as described above.

  Therefore, in order to prevent the shear sliding failure, a method of arranging reinforcing bars in the peripheral portion of the concave portion of the support housing has been proposed (see Patent Document 3).

JP 2009-114738 A JP-A-6-33470 Japanese Examined Patent Publication No. 7-65318

  However, even in the technique disclosed in Patent Document 3, since the height of the surface of the joint portion 126 is flush with the upper surface of the support housing 120, a shear slip fracture surface occurs in the vicinity of the surface of the support housing. For this reason, the amount and position of the reinforcing bars are limited, and the concrete volume that resists shear slip failure is reduced, so that shear slip failure cannot be sufficiently prevented.

  An object of the present invention is to provide a joint structure that can effectively prevent bearing failure and shear sliding failure.

  The joint structure according to claim 1 is a joint structure between a column and a support housing that supports the column, and a recess is formed on a surface of the support housing, and one end of the column is fitted into the recess. And a joint is formed, and on the surface side of the support housing of the joint, a block that blocks or buffers the force transmitted between the inner wall surface of the recess and the side surface on the one end side of the column. A buffer portion is provided.

Here, the one end side of the column is not limited to only one end side of the upper end or the lower end of the column, and the case where the present invention is applied to both the upper and lower ends of the column is not excluded.
According to the present invention, one end side of the column is fitted into the recess to form a joint, and the surface of the support housing in the joint is between the inner wall surface of the recess and the side on the one end side of the column. A shut-off buffer portion for shutting off or buffering the transmitted force was provided. Although a large bending moment acts on the joint portion between the one end side of the column and the concave portion, the one end side of the column can be restrained by the support housing via the joint portion, so that the bending strength of the column can be improved.

  In addition, since the bottom surface of the blocking buffer portion is located on the bottom surface side with respect to the surface of the support housing, shear sliding failure can be effectively prevented. This is because the shear slip failure surface of the support frame moves to the bottom side, so that the concrete area that resists shear slip failure increases, and it can be resisted by a sufficient reinforcing bar. This is because the acting eccentric support pressure of the is reduced.

In addition, by providing a blocking buffer, the inner height of the column is increased, so that the horizontal rigidity is reduced. Can be improved.
Further, since the inner wall surface of the concave portion restrains the vicinity of the surface of the joint portion, it is possible to effectively suppress the bearing failure near the surface of the joint portion.
In addition, since the concrete frame of the column is restrained by the joint portion, the creep deformation of the column can be suppressed.

  In the joining structure according to claim 2, the blocking buffer part is a gap between the inner wall surface of the recess and the side surface on one end side of the pillar, or the gap is filled with an adhesive or a viscoelastic body. It is formed.

According to the present invention, the blocking buffer portion is a gap between the inner wall surface of the recess and the side surface on one end side of the column. Alternatively, the blocking buffer portion is formed by filling the gap with an adhesive or a viscoelastic body.
In this case, the joining portion is formed, for example, by filling the gap between the recess and the column with grout mortar. Thereby, the clearance gap between the side surface of a pillar and the inner wall face of a recessed part can be filled reliably.
In addition, the Young's modulus of hardened grout mortar, adhesive, and viscoelastic body is often smaller than that of concrete, so the material edge fixing degree can be lowered, and the horizontal resistance at the time of earthquake is not expected positively in the design of the column Thus, the followability to horizontal displacement can be further improved.

  In particular, adhesive materials and viscoelastic bodies have a lower Young's modulus than grout mortar, so the column end portions are not constrained so much and the material end fixing degree is lowered. Therefore, when the horizontal resistance at the time of earthquake is not positively expected in the design, the horizontal displacement followability can be further improved by using an adhesive material or a viscoelastic body. Further, when a viscoelastic body is used, the viscoelastic body is deformed and absorbs vibration energy at the time of an earthquake, so that the column can be attenuated.

  The joining structure according to claim 3, wherein the pillar is made of precast reinforced concrete, and a hole is formed in one end surface of the pillar, and the steel material that is fixed to the support housing and extends toward the pillar is The hole is inserted into the hole, and the hole is filled with a filler.

Here, examples of the steel material include column main bars and dowel bars.
According to this invention, since the column is made of precast concrete, the column can be quickly constructed.
Also, when grout mortar is filled between the recess and one end of the column, the inside of the hole can also be filled with the filler, and the steel material extending from the support housing can be fixed to the column, thus reducing the construction labor. it can.

  The joint structure according to claim 4, wherein the pillar is made of precast reinforced concrete, and a hole is formed on a bottom surface of the recess, and the steel material fixed to the pillar and extending toward the recess is formed of the hole. The hole is inserted, and the inside of the hole is filled with a filler.

Here, examples of the steel material include column main bars and dowel bars.
According to this invention, since the column is made of precast concrete, the column can be quickly constructed.
Also, when grout mortar is filled between the recess and one end of the column, the inside of the hole can also be filled with the filler, and the steel material extending from the column can be fixed to the support housing, reducing the labor for construction. it can.

  The junction structure according to claim 5 is characterized in that the depth of the blocking buffer portion is determined based on a shear sliding fracture proof strength and a bending strength of a column member.

  As the depth of the blocking buffer portion becomes shallower, the danger section becomes higher, so that the bending strength of the column member increases. On the other hand, since the shear slip fracture surface increases as the depth of the blocking buffer increases, the shear slip fracture resistance increases. Therefore, only by adjusting the depth of the blocking buffer portion, it is possible to adjust the shear sliding fracture resistance and the column bending resistance.

  According to the present invention, since the bottom surface of the blocking buffer portion is located on the bottom surface side with respect to the surface of the support housing, it is possible to effectively prevent shear slip failure. This is because the shear slip failure surface of the support frame moves to the bottom side, so that the concrete area that resists shear slip failure increases, and it can be resisted by a sufficient reinforcing bar. This is because the acting eccentric support pressure of the is reduced. Further, since the inner wall surface of the concave portion restrains the vicinity of the surface of the joint portion, it is possible to effectively suppress the bearing failure near the surface of the joint portion.

It is sectional drawing of the junction structure which concerns on 1st Embodiment of this invention. It is AA sectional drawing of FIG. It is a figure which shows the relationship between the depth of a groove | channel, the bending proof strength of a pillar, and a shear sliding fracture proof strength. It is sectional drawing of the junction structure which concerns on 2nd Embodiment of this invention. It is sectional drawing of the junction structure which concerns on 3rd Embodiment of this invention. It is sectional drawing of the junction structure which concerns on 4th Embodiment of this invention. It is sectional drawing of the junction structure which concerns on 5th Embodiment of this invention. It is sectional drawing of the junction structure which concerns on the 1st prior art example of this invention. It is sectional drawing of the junction structure which concerns on the 2nd prior art example of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description of the embodiments, the same constituent elements are denoted by the same reference numerals, and the description thereof is omitted or simplified.
[First Embodiment]
FIG. 1 is a cross-sectional view of a bonding structure 1 according to the first embodiment of the present invention. FIG. 2 is a cross-sectional view taken along the line AA of FIG.
The joint structure 1 of reinforced concrete columns is a joint structure between a pillar member 10 as a pillar and a support housing 20 that supports the pillar member 10.

The column member 10 is a precast reinforced concrete structure manufactured in a factory. A cylindrical joint metal 11 is driven into the lower end of the column member 10, and the lower end edge of the joint metal 11 is exposed from the lower end surface of the column member 10. With the joint hardware 11, a hole is formed at the lower end of the column member 10.
Inside the joint hardware 11, the main reinforcement 12 fixed to the column member 10 extends downward.
Further, the column member 10 has an injection port 13 that communicates the internal space on the lower end side of the joint hardware 11 and the outside, and a filling confirmation port 14 that communicates the internal space on the upper end side of the joint hardware 11 and the outside. Is formed.

  A recess 21 is formed on the upper surface of the support housing 20. The recess 21 includes a bottom surface 22 and an inner wall surface 23 that surrounds the bottom surface 22. A main bar 24 as a steel material fixed to the support housing 20 extends upward from the bottom surface 22 of the recess 21.

  The column base portion of the column member 10 is fitted in the recess 21. That is, a spacer 25 made of mortar is formed on the bottom surface 22 of the recess 21 of the support housing 20, and the lower end surface of the column member 10 is placed on the spacer 25. As a result, a gap is formed between the column member 10 and the recess 21 of the support housing 20. Further, the main bar 24 of the support housing 20 is inserted into the joint hardware 11 and faces the main bar 12 of the column member 10.

The gap between the column member 10 and the recess 21 and the internal space of the fitting 11 are filled with grout mortar as a highly fluid filler. Among these, the grout mortar filled in the gap between the column member 10 and the concave portion 21 is cured, whereby the joint portion 40 as a joint portion is formed. The joint portion 40 is formed along the recess 21.
The surface of the joint portion 40 is at a predetermined position lower than the upper surface of the support housing 20, so that a blocking buffer portion is provided between the inner wall surface 23 of the recess 21 and the side surface of the column member 10 on the column base portion side. The groove 41 is formed. The groove 41 blocks the force transmitted between the inner wall surface 23 of the recess 21 and the side surface of the column member 10 on the column leg portion side.

In the joining structure 1 described above, the column member 10 is joined to the support housing 20 in the following procedure.
First, the spacer 25 is provided in the recess 21 of the support housing 20.
Next, the column member 10 is brought close to the support housing 20 from above, and the column base portion of the column member 10 is fitted into the recess 21. Thereby, a gap is formed between the column member 10 and the recess 21.
Next, the mold 27 is attached so as to close the upper part of the gap between the column member 10 and the recess 21. The height of the lower end surface of the mold frame 27 is set to a position lower than the upper surface of the support housing 20 by a predetermined dimension.

Next, until it is confirmed that the grout mortar overflows from the filling confirmation port 14, the grout mortar is injected into the injection port 13 to fill the inner space of the joint hardware 11 with the grout mortar, and the column member 10 and the recess 21. The joint portion 40 is formed in the gap.
In this way, the column member 10 is integrally joined to the support housing 20.

  After the grout mortar is cured, the mold 27 around the column member 10 is removed.

  Here, the height of the surface of the joint portion 40, that is, the depth of the groove 41, the bending strength of the filling height section of the column member 10 is equal to or greater than the bending moment acting on the filling height section of the column member 10, and The shear sliding fracture resistance of the support housing 20 is determined to be equal to or greater than the acting eccentric support pressure.

FIG. 3 is a diagram showing the relationship between the depth of the groove and the bending strength and shear sliding fracture strength of the column member.
The bending strength of the column member in the range from the bottom surface of the recess to the bottom surface of the groove is sufficiently improved by being restrained by the concrete of the support frame or the surrounding joints. Also, the bending moment acting on the column member increases as it goes toward the lower end side of the column.
Therefore, regardless of the depth of the groove, the cross section at the bottom surface position of the groove becomes a dangerous cross section, and as the depth of the groove becomes shallower, this dangerous cross section becomes a higher position. Become.

  On the other hand, as the depth of the groove increases, the shear slip fracture surface increases, so the shear slip fracture resistance increases, and the acting eccentric support pressure at the same deformation also decreases.

  Therefore, it is necessary to set the depth of the groove appropriately in consideration of both the bending strength and the shear sliding fracture strength of the column member.

Incidentally, the shear slip destruction strength is calculated by multiplying the contact area of the concrete and mortar pillar member bearing capacity F _b.
Bearing capacity _{F b} is determined by the following equation (1).

Here, _Fc is the compressive strength of the concrete, a and b are the length of each side of the bearing surface, a ′ and b ′ are the length of each side of the bearing surface, and β and K ′ are the following formulas ( 2) and (3).

Here, K ₀ is a constant defined by experiment and is practically 50 (lb / m ² ). F _t is the tensile strength of concrete.

According to this embodiment, there are the following effects.
(1) The column base portion of the column member 10 is fitted into the recess 21 to form the joint portion 40, and the inner wall surface 23 of the recess 21 and the column member 10 are formed on the surface side of the support housing 20 in the joint portion 40. A groove 41 for blocking the force transmitted to the side surface of the column base is provided. A large bending moment acts on the joint portion 40, which is a joint portion between the column base portion of the column member 10 and the concave portion 21, but the column base portion of the column member 10 can be restrained by the support housing 20 via the joint portion 40. The bending strength of the column member 10 can be improved.

  In addition, since the bottom surface of the groove 41 is lower than the top surface of the support housing 20, shear sliding failure can be effectively prevented. As shown in FIG. 3, since the occurrence position of the shear slip fracture surface of the support housing 20 becomes low, the concrete area that resists shear slip fracture increases, and it can resist with sufficient reinforcing bars, Moreover, it is because the action eccentric support pressure at the same deformation becomes small.

In addition, since the inner height of the column member 10 is increased by providing the groove 41, the horizontal rigidity is reduced, and when the horizontal resistance at the time of earthquake is not expected in the design of the column member 10, the horizontal displacement is reduced. The followability to can be improved.
In addition, since the inner wall surface 23 of the recess 21 restrains the vicinity of the surface of the joint portion 40, the bearing failure near the surface of the joint portion 40 can be effectively suppressed.
Moreover, since the concrete frame of the column member 10 is restrained by the joint portion 40, creep deformation of the column member 10 can be suppressed.

(2) Since the joint portion 40 is formed by filling the gap between the recess 21 and the column member 10 with grout mortar, the gap between the side surface of the column member 10 and the inner wall surface 23 of the recess 21 can be reliably filled. it can.
In addition, since the Young's modulus of the hardened grout mortar is often lower than that of concrete, the material end fixing degree can be lowered. The followability to horizontal displacement can be further improved.

  (3) By simply adjusting the depth of the groove 41, the shear sliding fracture resistance and the bending resistance of the column member 10 can be adjusted.

(4) Since the column member 10 is made of precast concrete manufactured in a factory, the column can be quickly constructed.
Further, when the groove 41 is formed by filling a filler between the concave portion 21 and the column base portion of the column member 10, the main bar extending from the support housing 20 is also filled with the filler in the inner space of the joint hardware 11. Since 24 can be fixed to the pillar member 10, the construction labor can be reduced.

[Second Embodiment]
FIG. 4 is a cross-sectional view of a bonding structure 1A according to the second embodiment of the present invention.
In the present embodiment, the structure of the joint portion 40A is different from that of the first embodiment.
That is, in the joint portion 40A in the first embodiment, the portion along the inner wall surface 23 of the recess 21 is elastically deformed as a blocking buffer portion made of a viscoelastic body having a Young's modulus smaller than that of the grout mortar instead of the grout mortar. Part 42 was designated.
The elastic deformation portion 42 is formed by filling a gap between the inner wall surface 23 of the recess 21 and the side surface of the column member 10 on the side of the column base with the viscoelastic body, and the inner wall surface 23 of the recess 21 and the column of the column member 10. The force transmitted between the side surface on the leg side is buffered.

According to this embodiment, in addition to the effects (1) to (4) described above, the following effects can be obtained.
(5) An elastic deformation portion 42 made of a viscoelastic body is provided in a part of the joint portion 40. Since the viscoelastic body has a Young's modulus lower than that of grout mortar, the column base portion of the column is not constrained so much and the material end fixing degree is lowered. Therefore, when the horizontal resistance at the time of earthquake is not positively expected in the design of the column member 10, the horizontal displacement followability can be further improved as compared with the case where only the grout mortar is used as the filler.
Furthermore, since the viscoelastic body is deformed during an earthquake and absorbs vibration energy, the column member 10 can be attenuated.

[Third Embodiment]
FIG. 5 is a cross-sectional view of the joint structure 1B according to the third embodiment of the present invention.
In the present embodiment, the support housing 20 is a beam-column joint, and a part of the main bar 30 of the beam of the beam-column joint, here the main bar 30A is on the side of the recess 21 and the bottom surface 22 of the recess 21. To the upper surface of the beam-column joint.

According to this embodiment, in addition to the effects (1) to (4) described above, the following effects can be obtained.
(6) A part of the main bar 30 of the beam at the beam-column joint is disposed on the side of the recess 21 and at a height in a range from the bottom surface 22 of the recess 21 to the upper surface of the beam-column joint 20. Therefore, since the main reinforcement 30 of the beam can resist the shear slip failure, the shear slip failure can be further effectively suppressed.

[Fourth Embodiment]
FIG. 6 is a cross-sectional view of a joint structure 1C according to the fourth embodiment of the present invention.
The present embodiment is different from the first embodiment in that a dowel bar 29 as a steel material is provided on the support casing 20 and the column member 10C and the support casing 20 are joined by the dowel bar 29.
That is, the main reinforcement 12 of the column member 10C does not extend to the lower end surface of the column member 10C. A cylindrical sheath tube 11C is driven into the lower end of the column member 10C. The lower end edge of the sheath tube 11C is exposed from the lower end surface of the column member 10C, and a hole is formed in the lower end of the column member 10C by the sheath tube 11C.
The recess 21 of the support housing 20 is provided with a dowel bar 29, and the dowel bar 29 is inserted into the sheath tube 11C.

According to this embodiment, in addition to the effects (1) to (4) described above, the following effects can be obtained.
(7) The main member 12 of the column member 10 </ b> C is not fixed in the support case 20, and the column member 10 </ b> C and the support case 20 are joined by the dowel bar 29. Accordingly, since the material end fixing degree is lowered, the horizontal displacement followability can be improved when the horizontal resistance at the time of earthquake is not expected positively in the design of the column member 10C.

[Fifth Embodiment]
FIG. 7 is a cross-sectional view of a joint structure 1D according to the fifth embodiment of the present invention.
This embodiment is different from the first embodiment in that the concrete of the column member 10D is cast on site. Even in this case, the groove 41 is formed by filling the gap between the inner wall surface 23 of the recess 21 and the column member 10D to a predetermined height and forming the joint portion 40D.

According to this embodiment, in addition to the effects (1) to (3) described above, the following effects can be obtained.
(8) Since the column member 10D is constructed by placing the concrete on site and placing concrete, the construction cost can be reduced.

  It should be noted that the present invention is not limited to the above-described embodiment, and modifications, improvements, etc. within a scope that can achieve the object of the present invention are included in the present invention.

  For example, in each of the above-described embodiments, the present invention is applied to the joining of the column bases of the column members 10, 10 </ b> C, and 10 </ b> D and the support housing 20, but the present invention is not limited thereto, and the present invention is not limited to this. You may apply to joining with a housing. Moreover, you may apply this invention to both joining of the column head of a column member, and a support housing, and joining of the column base part of a column member, and a support housing.

  Further, in the above-described fourth embodiment, the dowel bar 29 is provided in the support casing 20 and the column member 10C and the support casing 20 are joined by the dowel bar 29, but not limited to this, the dowel bar is provided in the column member 10. It may be provided and the column member and the support housing may be joined by this dowel bar.

  Moreover, the depth of the recessed part 21 may be set suitably. For example, when the column member 10 is actively burdened with a horizontal force during an earthquake, the depth of the recess is increased in order to increase the material end fixing degree. On the other hand, since the seismic wall in the frame bears most of the horizontal force, if the horizontal force is not expected to be applied to the column member 10, the depth of the concave portion is decreased in order to improve the horizontal displacement followability. .

Moreover, the shape and formation method of the recessed part 21 of the support housing 20 are not specifically limited.
In the fifth embodiment, the concrete of the column member 10D is cast in the field, and the groove 41 is formed by filling the grout mortar in the gap between the column member 10D and the recess 21 to form the joint portion 40D. Not limited to this. For example, the joint portion 40D may be formed integrally with the column member 10D, or the joint portion 40D may be formed integrally with the support housing 20. Alternatively, a viscoelastic body may be provided between the column member and the recess by placing a sheet-like viscoelastic body in the recess and placing the concrete of the column member in-situ in this state.

1, 1A, 1B, 1C, 1D Joining structure 10, 10C, 10D Column member (column)
DESCRIPTION OF SYMBOLS 11 Joint metal fitting 11C Sheath pipe 12 Main reinforcement 13 Inlet 14 Filling confirmation port 20 Supporting frame (column beam junction)
21 Concave portion 22 Bottom surface 23 Inner wall surface 24 Main reinforcement (steel material)
25 Spacer 27 Formwork 29 Dowel Reinforcement (Steel)
30, 30A Main muscle 40, 40A, 40D Joint part (joint part)
41 groove (blocking buffer)
42 Elastic deformation part (blocking buffer part)

Claims (5)

It is a joining structure of a pillar and a supporting housing that supports the pillar,
A recess is formed on the surface of the support housing,
While one end of the pillar is fitted into the recess to form a joint,
A blocking buffer portion that blocks or buffers the force transmitted between the inner wall surface of the recess and the side surface on the one end side of the column is provided on the surface side of the support housing of the joint portion. Joining structure.   The blocking buffer portion is formed as a gap between an inner wall surface of the recess and a side surface on one end side of the column, or is formed by filling the gap with an adhesive or a viscoelastic body. The joining structure according to 1. The pillar is precast reinforced concrete,
A hole is formed in one end surface of the pillar,
The steel material fixed to the support housing and extending toward the pillar is inserted into the hole,
The joint structure according to claim 1, wherein the hole is filled with a filler. The pillar is precast reinforced concrete,
A hole is formed in the bottom surface of the recess,
The steel material fixed to the pillar and extending toward the recess is inserted into the hole,
The joint structure according to claim 1, wherein the hole is filled with a filler.   The junction structure according to any one of claims 1 to 4, wherein the depth of the blocking buffer portion is determined based on a shear sliding fracture strength and a bending strength of a column member.

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