JP2002242308A - Jointing structure of enclosed type sectional column and beam - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily and rigidly joint a steel column having an enclosed type cross section and steel beams, such as H-steel without using a diaphragm as seen in conventional devices, and to arrange jointing members in the two directions connected to the steel beams in the two directions installed to the steel column in the same plane in the jointing structure or the steel column and the steel beams. SOLUTION: Penetrating metallic materials 3, penetrated horizontally to the joining section of a CFT column 1 and joint metals 4, having a shape that bolt sections 6 are projected integrally from plate sections 5 with bolt holes 5a are mounted on a beam-column connection section; the column-side end sections of nut metallic materials 7 are screwed to male screws 3a projected from the steel-column side faces of the penetrating metallic materials 3; the bolt sections 6 of the joint metals 4 are screwed at the beam-side end sections of the nut metallic materials 7; and the plate sections 5 of the joint metals 4 are spliced to a beam flange 2a and clamped by bolts 10. When the steel beams 2 in the two directions are secured to the column 1, the intermediate sections 3b of the penetrating metallic materials 3 are made eccentric in the vertical direction, so that penetrating metallic materials 3 in the two directions are arranged in the same plane.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint structure between a column having a closed section such as a steel pipe and a beam, and is particularly effectively applied to a concrete-filled steel column.

[0002]

2. Description of the Related Art Concrete-filled steel pipe columns in which concrete is filled in steel pipes (hereinafter referred to as CFT columns: Concret)
e Filled steel tubular menber) is more effective against local buckling than hollow steel pipe columns due to the constraint of concrete, and the filled concrete is constrained by the steel pipe and becomes triaxial stress state, increasing the compressive strength. There are advantages.
In addition, at the joint between the CFT column and the steel beam, the local deformation of the steel pipe is restrained by the filled concrete against the force transmitted from the steel beam to the column, so the size of the diaphragm is smaller than that of the hollow steel pipe column. In addition, there is an advantage that the shear strength of the joint of the beam-column joint increases due to the presence of the filled concrete.

[0003] When a joint end of a steel beam made of H-section steel or the like is joined to the side surface of such a CFT column, similarly to a hollow steel tube column not filled with concrete, an outer diaphragm type as shown below is used. A joint structure such as a diaphragm type, an inner diaphragm type, and a long-tightening bolt tension connection type has been adopted or proposed ("Concrete Filled Steel Pipe Structural Design and Construction Guidelines", editorial editor: Architectural Institute of Japan, Release Office : Maruzen Co., Ltd.).

(1) Outer diaphragm type An outer diaphragm composed of upper and lower flanges and a web is attached to the outer periphery of a joint portion of a steel column by welding. The outer diaphragm is cut at, for example, a corner and divided into four parts, and the divided parts are attached to each other by welding, and each divided part is attached to the side plate of the steel column by welding. The steel beam is attached to the tip of the outer diaphragm by bolting or the like.

(2) Through-diaphragm type A steel column is divided into upper and lower parts, and a pair of upper and lower horizontal (through) diaphragms with holes for concrete filling are inserted between them, and are attached to the upper and lower steel columns by welding, respectively. . The upper and lower flanges of the steel beam are attached to the ends of a pair of upper and lower horizontal diaphragms by butt welding or the like.

(3) Inner Diaphragm Type The central portion of the joint of the steel column is cut horizontally, and from this cut portion, perforated inner diaphragms are respectively inserted into the upper and lower steel columns and fixed by welding. The upper and lower steel columns are fixed to each other by welding, and the steel beams are attached to the side surfaces of the steel columns by welding so that the upper and lower inner diaphragms and the upper and lower flanges of the steel beams match.

(4) Tensile connection type of long tightening bolts When it is attempted to connect a steel beam to a closed column such as a box column by bolts, it is physically difficult to install a nut inside the column of the connecting bolt. , As shown in FIG.
A long-tightening bolt tension joining type using a through bolt (a connecting rod with both ends male thread) 50 that horizontally penetrates the joining portion of the FT column 1 has been considered. For example, the joint metal 52 attached to the steel beam 2 is fastened to the column 1 by fastening a nut 51 to an end of a through bolt 50 protruding from the side surface of the column 1. When the steel beam 2 is attached to the column 1 from two directions in plan view, the through bolts 50 are arranged in the X direction and the Y direction orthogonal to each other in plan view.

[0008]

However, the above-mentioned conventional joint structure has the following problems.

(1) In the case of the outer diaphragm type, the through diaphragm type, and the inner diaphragm type, there are many welding locations,
Manufacturing becomes complicated, requires advanced welding technology, and requires a great deal of labor for quality control and precision control. Further, in the case of the outer diaphragm type, since it protrudes largely from the column material, the loading efficiency during transportation deteriorates. In the inner diaphragm format,
Workability is extremely poor because it is installed inside the pillar.

(2) In the case of a long fastening bolt tension joint type, FIG.
As shown in the figure, since the through bolts 50 in the X direction and the Y direction interfere with each other, they cannot be arranged in the same plane, and the flange level of the steel beam 2 in the X direction and the Y direction (upper flange level, ie, floor) Level) cannot be matched, or different joints must be used in the X direction and the Y direction.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to easily and rigidly join a steel column and a steel beam without using a conventional diaphragm. It is still another object of the present invention to provide a closed-section column-beam joint structure in which two-way joint members connected to two-way steel beams attached to a steel column can be arranged in the same plane.

[0012]

According to the present invention, an end of a steel beam (such as an H-beam or an I-beam) is provided on the side of a steel column having a closed section (such as a rectangular section or a circular section). It is a joint structure for joining, and includes a through metal part (such as a bolt member) that horizontally penetrates a joint part of a steel column and a joint metal body in which a bolt part integrally projects from a flat plate part having a bolt hole. The through metal part has an intermediate part located inside the steel column, which is eccentric in the vertical direction, and the column side end of the nut metal part is screwed into a male screw projecting from the side of the steel column of the through metal part. A joint structure between a closed column and a beam, wherein a bolt portion of the joint hardware is screwed into a side end portion, and a flat plate portion of the joint hardware is attached to a beam flange and fastened with a bolt. (See FIG. 2).

The first aspect of the present invention relates to a case in which two-way steel beams are attached to a steel column in plan view, such as corner columns, side columns, and middle columns, and two-way through hardware intersects inside the steel column. This is applied, and the eccentric intermediate portions of the two-way through hardware are overlapped with each other upside down, and both ends of the two-way through hardware, that is, the levels of the two-way joint hardware are the same level. In addition, a long nut member is used as the nut hardware to which the joining hardware is connected, and when there are steel beams at both ends, tension is introduced into the through hardware by tightening the long nut members at both ends. If there is no steel beam on one side, a normal nut member (or bolt head or the like) can be used on one side. In this case as well, tension can be introduced into the through hardware by tightening the nut member.

According to a second aspect of the present invention, there is provided a joint for joining an end of a steel beam (H-beam or I-beam) to a side surface of a steel column having a closed cross section (rectangular cross section or circular cross section). It is a structure, comprising a through hardware horizontally penetrating the joint of the steel column, and a bonding hardware attached to the steel beam, the through hardware,
An intermediate portion located inside the steel column is eccentric in the vertical direction, and an end protruding from the side of the steel column is attached to the metal joint. .

In the second aspect, the same through-hole metal as in the first aspect is used, and two-way steel beams are attached to the steel columns in plan view, such as corner pillars, side pillars, and middle pillars, and inside the steel pillars. The present invention is applied to a case where two-way through hardware intersects. However, the bonding hardware is not limited to a bonding hardware including a flat plate portion and a bolt portion, for example, a T-shaped bonding hardware or a sleeve-shaped bonding hardware in a side view. Hardware can be used. In this case as well, tension can be introduced into the through hardware by tightening the nut member.

A third aspect of the present invention is a joint for joining an end of a steel beam (H-shaped steel, I-shaped steel, etc.) to a side surface of a steel column having a closed cross section (rectangular cross section, circular cross section, etc.). A through metal part (such as a bolt member) that horizontally penetrates the joint part of the steel column; and a joint metal part having a shape in which the bolt part projects integrally from a flat plate part having a bolt hole. The column side end of the nut fitting is screwed into a male screw projecting from the side of the steel column, the bolt portion of the joint fitting is screwed into the beam end of the nut fitting, and the flat plate portion of the joint fitting is attached to the beam flange to attach the bolt. A structure of a joint between a column and a beam having a closed cross-section, characterized in that the joint is constituted by fastening with a joint (see FIG. 1).

The third aspect of the present invention is applied to a case where a unidirectional steel beam is attached to a steel column in a plan view. The joining hardware has a bolt-like (rod-like) shape having external threads formed at both ends. Things can be used. Also in this case, a long nut member is used as the nut hardware, and tension is introduced into the through hardware by tightening the nut member.

A fourth aspect of the present invention is the first and second aspects.
Alternatively, in the joint structure according to claim 3, the steel column having a closed section is a concrete-filled steel column (a CFT column in which a rectangular steel pipe or a circular steel pipe is filled with concrete, or a column in which an assembling box column or the like is filled with concrete). ) Is a joint structure between a column and a beam having a closed cross section.

According to a fifth aspect of the present invention, in the joint structure according to the first, second, third, or fourth aspect, the web at the joint end of the steel beam is formed at the joint of the steel column. A closed section column and beam joint structure, which is bolted to a gusset plate fixed to a side plate. The gusset plate is provided as needed.

Further, a column reinforcing plate can be provided on the outer surface of the side plate of the steel column into which the through hardware is inserted and attached. This column reinforcing plate is also provided as needed. In the joint structure with the above configuration, bending moment and shear force act on the beam end due to external force applied to the steel beam,
The tensile moment and the compressive force concentrate on the beam end flange due to the bending moment. In the present invention, tension is introduced into the through hardware by tightening the steel column with the through hardware and the nut hardware,
The side plate of the steel column and the nut hardware are crimped into a tensile connection state, and the tensile or compressive force applied to the beam flange acts as a supporting force on the side plate of the steel column via the bonding hardware, the nut hardware, and the through hardware. The bulging of the side plate in the other direction due to the compressive force in one direction is prevented by the restraining effect of the through hardware in the orthogonal direction. The shearing force is transmitted directly to the steel column by bolt connection between the gusset plate fixed to the steel column and the beam web.

According to the present invention, the strength of the beam-column joint can be improved by introducing tension into the metal fitting penetrating the steel column with the nut metal, and the rigid column can be formed without using a horizontal diaphragm. Beam joints can be obtained, and furthermore, since there is no horizontal diaphragm on the steel column as in the past, welding work can be eliminated, and it is only necessary to make a hole in the steel column, so production of the steel column can be done It becomes extremely easy, and the quality can be improved. Further, since the diaphragm does not protrude outward as in the related art, the loading efficiency during transportation is good. Also, a surface such as a corner post to which a steel beam cannot be attached can be effectively applied when there is no space between the end of the through hardware and the nut because the surface protrudes only from the nut.

By using a metal joint consisting of a flat plate part and a bolt part and screwing the bolt part into a nut metal part, it is possible to easily absorb an error in the projected dimension of the steel beam. When concrete-filled steel columns are used for steel columns, pre-stress is given to the filled concrete by tightening the columns with penetrating hardware and nuts and introducing tension to the penetrating hardware. Therefore, a larger tension can be introduced into the through metal member, and the strength of the entire joint can be further improved. In addition, since the diaphragm does not protrude from the inner peripheral portion of the steel pipe and only the rod-shaped through-hole is provided at the central portion in the steel pipe, the filling property of the filled concrete is improved.

The use of the through hardware whose center portion is eccentric in the vertical direction allows the two-way joint hardware connected to the two-way steel beam attached to the steel column to be arranged in the same plane. The flange level (upper flange level or floor level) of the steel beam can be matched.

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on an embodiment shown in the drawings. FIG. 1 shows a first embodiment (corresponding to claim 3) of a joint structure between a closed section column and a beam according to the present invention, in which a unidirectional steel beam is attached to a steel column. It is. FIG. 2 shows a more specific second embodiment (corresponding to claim 1) of a joint structure between a closed section column and a beam according to the present invention, in which a bidirectional steel beam is attached to a steel column. Is the case. FIG. 3 shows an example of the through hardware used in the embodiment of FIG.

In FIG. 1, a steel beam 2 having an H-shaped section in the X direction is attached to a side surface of a concrete-filled steel pipe column (hereinafter referred to as a CFT column) 1 in which a concrete 1b is filled in a rectangular steel pipe 1a. The joint structure of the present invention has a C
A bolt (rod) -shaped through hardware 3 that horizontally penetrates the joint of the FT column 1, a joint metal 4 having a shape in which the bolt portion 6 integrally projects from a flat plate portion 5 having a bolt hole 5 a, and a through metal 3 Tension is introduced to the through-hole hardware 3 and the joining hardware 4
And a pair of upper and lower through hardware 3, 3
Gusset plate 8 provided on the side of CFT column 1 between
It consists of.

The through metal fitting 3 and the joint metal 4 are arranged in a pair on the left and right with the web 2b of the steel beam 2 as a center in a plan view of FIG. 1A, and the steel beam 2 in a front view of FIG. The metal fittings 4 are arranged in a pair such that the metal fittings 4 are located on the upper surface of the upper flange 2a and the lower surface of the lower flange 2a.

The through hardware 3 has male threads 3a at both ends of the rod.
Are formed, and the side plate (column flange) of the square steel pipe 1a is formed.
The male screws 3a at both ends project from the side plate of the CFT column 1 outward by a predetermined length.

The nut fitting 7 is a long nut member such as a hexagon or a square having a longer length than a normal nut.
And a female screw 7a into which the bolt 6 of the metal fitting 4 is screwed.

The gusset plate 8 is a member for transmitting a shearing force. The gusset plate 8 has a base end vertically fixed to a side plate of the square steel pipe 1a by welding or the like, a tip end attached to a side surface of the web 2b, and bolts 11 attached. Joined. The gusset plate 8 may not be provided.

In the joint structure having the above structure,
The construction is performed according to the following procedure (see FIG. 1). (1) The metal fitting 3 is inserted into the through hole 9 of the square steel pipe 1a so that the male screws 3a at both ends project from the side plates of the square steel pipe 1a. (2) Attach nut fittings 7 to male screws 3a at both ends of through fitting 3. (3) Casting concrete 1b into square steel pipe 1a. (4) When the filling concrete 1b reaches the specified strength,
Tighten the nut hardware 7 to introduce tension into the through hardware 3,
Prestress is applied to the filling concrete 1b at the joint. This introduction tension is set in consideration of the safety factor,
Even if a tensile force acts on the joint portion, the remaining tension prevents the nut hardware 7 from loosening. (5) The bolt 6 of the joint metal 4 is screwed into the nut metal 7 to adjust the protrusion dimensions of the joint metal 4, and
Level. (6) The steel beam 2 is suspended, the flat plate portion 5 is attached to the upper and lower flanges 2a and fixed by bolts 10, and the gusset plate 8 is fixed to the web 2b by bolts 11 to complete the construction.

Next, FIG. 2 shows a case where a bidirectional steel beam 2 is attached to a CFT column 1 in a corner column, a side column, and a middle column.
By using a special shape for the through hardware 3, the through hardware 3 in the X direction and the Y direction can be arranged without interfering with each other.
The metal fittings 4 in the direction and the Y direction can be arranged in the same plane. The joint hardware 4, the nut hardware 7, and the like are the same as those in the embodiment of FIG.

The through hardware 3 is, for example, as shown in FIG.
The intermediate portion is eccentric in a direction perpendicular to the central axis by a predetermined amount with respect to the central axis L, and is a flat plate portion 3b. The penetrating hardware 3 in the X direction and the Y direction are arranged so that the flat plate portion 3b is turned upside down (see FIG. 2B). Accordingly, the flat plate portion 3b is eccentric so that the flat plate portions 3b in the X direction and the Y direction are in contact with each other, and the amount of eccentricity is such that the contact surface at least coincides with the central axis L (see FIG. 3), and the flat portions are superposed. Sometimes X
The center axis L in the direction and the Y direction is located in the same plane. The shape and the amount of eccentricity of the flat plate portion 3b are not limited to the illustrated example, and may be any shape or amount of eccentricity such that the center axes L in the X and Y directions are located on the same plane when they are superposed. Good.

Further, the length of the flat plate portion 3b may be about the flange width of the steel beam 2 in accordance with the interval between the two metal fittings 3 (see FIG. 2 (a)). Further, the flat plate portion 3b is formed integrally with both ends of the circular cross section where the male screw 3a is formed through a connection portion formed by a gentle curve or a straight line so that the stress is smoothly transmitted.

When such a through metal part 3 is inserted into and attached to the square steel pipe 1a, in order to prevent a large-diameter circular through hole through which the flat plate portion 3b can pass from being formed in the square steel pipe 1a, it is necessary to take the following steps. As shown in FIG. 4, the shape of the through hole 9 is changed to the external thread 3a.
Has a keyhole shape in which a circular hole 9a through which the flat plate portion 3b can be inserted and a rectangular hole 9b through which the flat plate portion 3b can be inserted. It is preferable that the rectangular hole 9b is in the horizontal direction as described later, but the rectangular hole 9b can be in the vertical direction so as not to take a width in the horizontal direction. .

The keyhole-shaped through hole 9 is formed in the square steel pipe 1.
a may be provided on both side plates opposed to each other in the X direction or Y direction. However, since the insertion of the through hardware 3 is performed from one side, the keyhole-shaped through holes 9 are provided only in one side plate in the X direction or Y direction. May be formed, and a normal circular through hole 9 may be formed in the opposite side plate.

As shown in FIG. 2 (b), if necessary, a column reinforcing plate 12 is provided on the outer surface of the side plate of the rectangular steel pipe 1a to which the through hardware 3 is attached. The column reinforcing plate 12 is also provided with the through hole 9 having the above-described shape. The column reinforcing plate 12 is not limited to a plate shape, and may be a band shape surrounding the square steel pipe 1a. The column reinforcing plate 12 may be omitted.

In the joint structure having the above structure,
The construction is performed according to the following procedure (see FIG. 2). (1) Insert the through hardware 3 into the through hole 9 of the square steel pipe 1a so that the male screws 3a at both ends project from the side plates of the square steel pipe 1a. In the case of the through hole 9 having a keyhole shape in the horizontal direction shown in FIG. 2, first, the flat plate portion 3b of the through hardware 3 in the Y direction is horizontally inserted into the through hole 9 on one side, and the through hole 9 on the opposite side is left as it is.
Is inserted into the end of the through hardware 3. Then, when inserting the through hardware 3 in the X direction, as shown in FIG. 4 (a), the through hardware 3 does not hit the through hardware 3 in the Y direction.
Raise (or lower) the tip of the through hardware 3 in the direction
Insert, then horizontal and X direction flat plate part 3b
Is superimposed on the flat plate portion 3b in the Y-direction, the horizontal through-hole hardware 3 in the X direction is further inserted, and the end of the through-hole hardware 3 is inserted into the through hole 9 on the opposite side. In this case, even if the through hole 9 has a small diameter corresponding to a normal bolt hole diameter, the insertion operation can be easily performed. In the case of the through-hole 9 in the shape of a keyhole in the vertical direction in FIG. 4B, it is necessary to insert the plate portion 3b vertically and then rotate it by 90 °. Insertion becomes possible by enlarging the hole 9 or the like.

(2) Attach nut fittings 7 to male screws 3a at both ends of the through fitting 3. (3) Casting concrete 1b into square steel pipe 1a. (4) When the filling concrete 1b reaches the specified strength,
Tighten the nut hardware 7 to introduce tension into the through hardware 3,
Prestress is applied to the filling concrete 1b at the joint. This introduction tension is set in consideration of the safety factor,
Even if a tensile force acts on the joint portion, the remaining tension prevents the nut hardware 7 from loosening. (5) The bolt 6 of the joint metal 4 is screwed into the nut metal 7 to adjust the protrusion dimensions of the joint metal 4, and
Level. (6) The steel beam 2 is suspended, the flat plate portion 5 is attached to the upper and lower flanges 2a and fixed by bolts 10, and the gusset plate 8 is fixed to the web 2b by bolts 11 to complete the construction.

In the embodiment shown in FIG.
When the T pillar 1 is a corner pillar or a side pillar, a normal nut is used instead of the nut hardware 7 on a surface on which the steel beam 2 is not attached.
A tension can be introduced into the through hardware 3. Note that a bolt head or a locking projection of a bolt member may be used instead of the nut.

Further, in the embodiment of FIG. 2, a metal joint composed of a flat plate portion and a bolt portion has been exemplified. However, the present invention is not limited to this, and a T-shaped metal joint in a side view, a sleeve-shaped metal joint, and other joint metals. It may be hardware.

In the above description, the CFT column in which concrete is filled in a steel pipe has been described.
The present invention can also be applied to a steel column filled with concrete inside an assembled box column or the like, or a normal hollow steel tube column or an assembled box column not filled with concrete. Further, although the case where the column material is a square steel pipe has been described, the present invention can be applied to a circular steel pipe and the like.

[0042]

Since the present invention has the above-described configuration, the following effects can be obtained.

(1) At the joint between a steel column having a closed cross section and a steel beam such as an H-section steel, a tension is introduced into the through metal through the steel column by using a nut, using a through metal, a nut, and a metal joint. By doing so, the strength of the beam-column joint can be improved, and a rigid beam-column joint can be obtained without using a horizontal diaphragm.Furthermore, a conventional horizontal diaphragm can be used for a steel column. Since it is not provided, the welding operation can be eliminated, and it is only necessary to make a hole in the steel column, so that the manufacture of the steel column becomes extremely easy and the quality can be improved. (2) Since the diaphragm does not protrude outward as in the conventional case, the loading efficiency during transportation is improved. Also, a surface such as a corner post to which a steel beam cannot be attached can be effectively applied when there is no space between the end of the through hardware and the nut because the surface protrudes only from the nut. (3) By using a metal joint consisting of a flat plate part and a bolt part and screwing the bolt part into a nut metal part, it is possible to easily absorb an error in the projecting dimension of the steel beam.

(4) When a concrete-filled steel column is used for a steel column, a prestress is given to the middle-packed concrete by tightening the column with a through-hole and a nut to introduce tension into the through-hole. The presence of the filled concrete allows a greater tension to be introduced into the through hardware, thereby improving the strength of the entire joint. (5) The diaphragm does not protrude from the inner periphery of the steel pipe,
Since only the rod-shaped through metal fittings are provided at the central part in the steel pipe, the filling property of the middle concrete is improved. (6) By using the through hardware whose center part is eccentric in the vertical direction, the two-way joint hardware connected to the two-way steel beam attached to the steel column can be arranged in the same plane, The flange level of the steel beam can be matched.

[Brief description of the drawings]

FIG. 1 is a diagram showing a first example of a joint section between a closed column and a beam according to the invention
1 shows an embodiment, in which (a) is a plan view and (b) is a front view.

FIG. 2 is a view showing a second example of the joint structure between a closed column and a beam according to the present invention;
1 shows an embodiment, in which (a) is a plan view and (b) is a front view.

FIGS. 3A and 3B show an example of a through hardware used in the embodiment of FIG. 2, wherein FIG. 3A is a side view and FIG. 3B is a plan view.

4A and 4B are a cross-sectional view showing an inserted state of a through hardware in the embodiment of FIG. 2 and a front view showing a shape of a through hole.

FIG. 5 is a plan view showing a conventional long-tightening bolt tension joining type in a closed section column.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Concrete filling steel pipe column (closed section column) 1a ... Square steel pipe 1b ... Concrete filling concrete 2 ... Steel beam 2a ... Vertical flange 2b ... Web 3 ... Through metal 3a ... Male screw 3b ... Flat plate part 4 ... Bonding metal 5 ... Flat plate Part 5a Bolt hole 6 Bolt part 7 Nut hardware 8 Gusset plate 9 Through hole 9a Circular hole 9b Rectangular hole 10 Bolt 11 Bolt 12 Column reinforcement plate

Claims (5)

[Claims] 1. A joint structure for joining an end portion of a steel beam to a side surface of a steel column having a closed cross-section, a through-hole metal penetrating a joint portion of the steel column horizontally, and a flat plate portion having a bolt hole. And a joint metal having a shape in which a bolt part is integrally protruded from the center of the through-metal, and the middle part located inside the steel column is eccentric in the vertical direction, and the male screw protrudes from the side of the steel column of the through-metal. It is configured by screwing the column side end of the nut hardware, screwing the bolt portion of the joint hardware into the beam side end of the nut hardware, attaching the flat plate portion of the joint hardware to the beam flange, and fastening with the bolt. A joint structure between a column and a beam having a closed cross section. 2. A joint structure for joining an end portion of a steel beam to a side surface of a steel column having a closed cross-section, wherein a through-hole metal penetrating a joint portion of the steel column horizontally and a joint attached to the steel beam. A metal fitting, and the through metal fitting is characterized in that an intermediate portion located inside the steel column is vertically eccentric, and an end protruding from the side of the steel column is attached to the joint metal. Column and beam joint structure. 3. A joint structure for joining an end portion of a steel beam to a side surface of a steel column having a closed cross section, wherein a through-hole metal penetrating a joint portion of the steel column horizontally, and a flat plate portion having a bolt hole. And a joint metal having a shape in which a bolt part is integrally projected from the screw member. A column end of the nut metal is screwed into a male screw projecting from a side of the steel column of the through metal member, and the joint is joined to a beam-side end of the nut metal. A joint structure between a closed column and a beam, wherein a bolt portion of a metal fitting is screwed in, and a flat plate portion of the metal joint is attached to a beam flange and fastened with a bolt. 4. The joint structure according to claim 1, wherein the steel column having a closed section is a concrete-filled steel column. Joint structure. 5. The gusset according to claim 1, wherein the web at the joint end of the steel beam is fixed to the side plate at the joint of the steel column. Closed section column and beam joint structure, which is bolted to the plate.