JP2018003322A - Column-beam junction structure, and manufacturing method of joint member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a column-beam junction structure that enables a plastic hinge generation position to be set at a desired position, along with a manufacturing method for a joint member that configures a connection structure such that the plastic hinge generation position is set at the desired position.SOLUTION: A column-beam junction structure is disposed between column members constituting a column of a structure, and includes: a column joint part 30 for joining with the column member; a beam joint part 31 for joining with a beam member protruding in a perpendicular direction from the column and constituting a beam; a joint member 40 having a plurality of reinforcing bars extending in the perpendicular direction inside the column joint part 30 and the beam joint part 31; and a plurality of joints 26 provided at an edge part of the beam joint part 31 or the beam member, for connecting the reinforcing bars of the connection member 40 with the reinforcing bars of the beam member. The plurality of reinforcing bars used with the joint member 40 is selected and the protruded length of the beam joint part 31 in the perpendicular direction is determined to suit a distance in the perpendicular direction from a side surface of the column and an edge part of the plurality of joints on a central side of the beam, when the joint member 40 has been connected with the beam member.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a joining structure of column beams and a method for manufacturing a joining member constituting the joining structure.

  A concrete structure is constructed by making columns and beams in advance using reinforced concrete (RC), building in the manufactured members, and integrating the joints with cast-in-place concrete. Making the member in advance is called precasting (PCa). By using PCa, the construction period is greatly shortened.

  In recent years, this joint is also made of PCa, and the connection between the joint made of PCa (joint member) and the beam made of PCa (beam member) uses a mechanical joint 10 as shown in FIG. Has been done. This method is called the column beam joint PCa conversion method. In the beam-column joint PCa chemical conversion method, in order to avoid damage to the joint between the column 11 and the beam 12, the distance L from the end (beam end) of the beam 12 joined to the column 11 to the mechanical joint 10 is set. The beam is about 1.0 to 1.5 times the beam D. Since the position of the beam end is a position having a cross section where the maximum bending stress is generated, it is called a dangerous cross section position. The beam D is a length from the upper surface to the lower surface of the beam 12.

  As shown in FIG. 2, the joining member 14 has a column joint portion 15 having the same cross-sectional shape and area as the column 11 and a beam joint portion 16 extending in the horizontal direction to connect to the beam member. A reinforcing bar (joint main bar) 18 protrudes from the end surface 17 of the portion 16 and is exposed. In addition, the rebar (beam main rebar) protrudes from the end face of the beam member and is exposed. The exposed joint main bar 18 and the beam main bar are connected by the mechanical joint 10, and then concrete is placed (in-situ) and joined. FIG. 1 shows a spot hitting portion 13 which is a spot hitting spot.

  Thus, if the distance L is about 1.0 to 1.5 times the length of the beam, even if it is made PCa, the length of the beam joint 16 extending from both of the column joints 15 is long. There was a problem that it could not fit within the width of the vehicle. In addition, there is a problem that it is necessary to place concrete on-site, and it is necessary to assemble the formwork and to place concrete on site.

  In view of such a problem, a method has been proposed that enables a joint position to be provided at the beam end while avoiding damage to the joint using a technique called hinge relocation (see, for example, Patent Document 1). . In this method, as shown in FIG. 3, the mechanical joint 10 is brought into close contact with the side surface (column surface) of the column, and the position P where the plastic hinge of the beam is generated is set to the joint tip position on the center side of the beam. It is. The plastic hinge means that the bending rigidity is lost and it rotates like a hinge.

  By providing the mechanical joint 10 at the end of the beam member 19, there is no need to cast and join the concrete, and as shown in FIG. 4, the bending stress employed in the structural calculation is The maximum moment M1 can be reduced to the moment M2 at the joint tip position. Since the main bar amount of the beam main bar can be determined using this moment M2, the main bar level can be reduced. Moreover, since the beam joint part 16 which protrudes in a horizontal direction is not provided, it becomes possible to fit in the width | variety of a transport vehicle.

Japanese Patent Laying-Open No. 2005-155058

  However, in the above method, since the mechanical hinge 10 is brought into close contact with the column surface to generate a plastic hinge at the joint tip position, the plastic hinge generation position depends only on the length of the mechanical joint 10 and is desired. Cannot be set to position.

  Therefore, it is desirable to provide a column beam joining structure capable of setting the plastic hinge occurrence position to a desired position and a method for manufacturing a joining member constituting the connection structure so that the plastic hinge occurrence position is a desired position. It was rare.

  In view of the above problems, the present invention provides a column-to-column connection structure, which is disposed between column members constituting the column of the structure, and is connected to the column junction portion for joining to the column member, and the column A beam joint that projects in the vertical direction and is joined to a beam member that constitutes the beam; a joint member that includes a column joint and a plurality of reinforcing bars extending in the vertical direction inside the beam joint; and a beam joint A plurality of joints that are provided at the ends or the ends of the beam member and connect the reinforcing bars of the joining member and the reinforcing bars of the beam member, and the beam from the side of the column when the joining member and the beam member are joined A joint structure in which a plurality of reinforcing bars to be used for a joining member are selected according to the distance in the vertical direction to the ends of a plurality of joints on the center side, and the projection length in the vertical direction of the beam joint is determined Is provided.

  According to the present invention, it is possible to set the plastic hinge generation position to a desired position.

The figure explaining the conventional column beam junction part PCa chemical conversion method. The figure which illustrated the conventional joining member made into PCa. The figure explaining hinge relocation. The figure which illustrated the stress state of the beam at the time of an earthquake. The figure which showed 1st Embodiment of the junction structure of a column beam. The figure which illustrated the combination of the kind of reinforcing bar used for a joining member and a beam member. The figure which showed the structural example of the joining member. The figure explaining the change of the stress state by a joint position. The figure which showed the construction example for building the junction structure shown in FIG. The figure which showed 2nd Embodiment of the joining structure of a column beam. The figure which showed the bar arrangement example of the U-shaped reinforcement used for the joining structure shown in FIG. The flowchart which showed the manufacturing process of the joining member.

  FIG. 5 is a view showing a first embodiment of a column beam joining structure. Columns, beams, and their joints are pre-manufactured by placing a plurality of reinforcing bars in a formwork and placing concrete in a factory (PCa). They are transported to the site and assembled on site to construct a structure. The structure may be any structure such as a condominium, a commercial building, a hospital, or a school building as long as it is a concrete structure.

  The PCa column (column member) is arranged in the vertical direction, and a plurality of reinforcing bars (column main bars) protrude from the surface facing the vertical direction. The joint part (joining member) made into PCa has a hole through which a plurality of pillar main bars of the pillar member can be inserted, and the joining member is arranged on the pillar member by passing the end portion through the hole.

  Note that a metal pipe called a sheath tube is provided in advance in the hole of the joining member, and the column main reinforcement is passed through the sheath tube. The gap between the column main reinforcement and the sheath tube and the joint between the column member and the joining member are integrated by filling with a grout material that develops strength at an early stage.

  Another column member is connected to the upper part of the joining member, and the column member is provided with a plurality of mechanical joints at the end, and a plurality of lower column members penetrating the connection member are provided. By connecting the column main bars with a plurality of mechanical joints, the connection member is sandwiched between the upper and lower column members and fixed. By repeating this, the pillar 20 shown in FIG. 5 is constructed. In FIG. 5, the column member and the connecting member are already integrated.

  The mechanical joint may be any of a threaded joint, a mortar filling joint, an end threaded joint, and a steel pipe crimp joint. The threaded reinforcing bar joint is a joint in which deformed reinforcing bars whose nodes on the surface of the reinforcing bar are formed in a screw shape are connected by a pipe (coupler) whose inside is threaded, and a grout material is injected and fixed in the gap. The mortar-filled joint is a joint in which a high-strength mortar is filled and joined in a gap between a pipe (sleeve) whose inside is ribbed and a reinforcing bar.

  The end threaded joint is a joint in which screws joined to the end of a reinforcing bar are butted together and connected by a long nut, and then both ends of the long nut are tightened by a fixing nut. The steel pipe crimp joint is a joint that is joined by crimping a sleeve to a reinforcing bar joint by cold and hydraulic pressure.

  In addition to the plurality of sheath tubes, the bonding member has a plurality of reinforcing bars (joint main bars) extending in a direction perpendicular to the column 20 (a direction horizontal to the ground). Hereinafter, the direction in which the beam 21 extends will be described as the horizontal direction. The joining member has a beam joint that protrudes in the horizontal direction from both the column surface 22 and the column surface 23 on the back side, and has a plurality of joint main bars 24 inside. The beam member has a plurality of beam main bars 25 extending in the horizontal direction. The joining member and the beam member are joined by connecting each joint main bar 24 and each beam main bar 25 by a joint 26.

  The joint main reinforcement 24 is a horizontal distance from the column surfaces 22 and 23 to the ends (tips) of the plurality of joints 26 on the center side of the beam 21 when the joining member and the beam member are joined, that is, a plastic hinge is generated. It is selected according to position P. As the joint main bar 24, a high-strength reinforcing bar higher than the strength of the beam main bar 25 can be selected. By using this high-strength reinforcing bar from the column surfaces 22 and 23 to the joint 26, an earthquake occurs at the tip of the joint 26 connected to the high-strength reinforcing bar without generating a plastic hinge on the column surfaces 22 and 23. Sometimes plastic hinges can be generated properly. The joint 26 can be the same as the mechanical joint used in the column member.

A combination of the material type of the joint main reinforcement 24 and the material type of the beam main reinforcement 25 is illustrated in FIG. In FIG. 6, SD indicates a deformed reinforcing bar having protrusions (ribs) on the surface, and a numerical value such as 390 following SD indicates a yield point (N / mm ² ). If the material type of the beam main bar 25 is determined, the beam main bar 25 can be selected according to the position P and the material type of the beam main bar 25. Otherwise, the beam main bar 25 is also selected according to the position P. be able to. In addition, the strength of the reinforcing bar is higher as the yield point is higher. Thus, by providing an appropriate difference in the strength of the reinforcing bars, a plastic hinge can be appropriately generated at the tip of the joint 26. These combinations are merely examples, and other combinations may be used as long as a plastic hinge can be appropriately generated at the tip of the joint 26.

  Thus, a plastic hinge is generated at a predetermined position of the beam 21, damage is concentrated on the beam 21, and the beam 21 rotates to prevent the column 20 from rotating and prevent the structure from collapsing.

  The protruding length of the beam joint portion in the horizontal direction is also determined according to the position P. The projecting length is longer than the length of the joint 26 in the longitudinal direction, in which the joint 26 is not in close contact with the column surfaces 22 and 23 in consideration of construction conditions, design conditions, etc., and is 1.0 to 1.5 times that of the conventional beam. The length of the joint 26 can be determined to be shorter than the length obtained by adding the length of the joint 26.

  Examples of construction conditions and design conditions include a factory that manufactures PCa-made members, vehicles that transport the manufactured members, transportation routes, and work spaces on the site. The details are the formwork possessed in the factory, the mechanical joints to be used, the width of the vehicle, the width of the road, the height of the tunnel, the distance between the columns, and the like.

  In the conventional method, since the sizes of the joining member and the beam member are fixed, it is necessary to select a specific factory, a specific width vehicle, a specific joint, and a specific route, while considering the work space. I had to assemble it. For example, if the length is a little shorter, the PCa member can be loaded on the transporting vehicle without a gap, but because it is a little longer, a large gap is generated, the number of transports is reduced, and transport efficiency is low. However, in the present invention, the protrusion length can be adjusted to an optimum length in consideration of these, so that the range of selection is widened, and the operation can be performed smoothly.

  A value obtained by subtracting the length of the joint 26 from the determined protruding length is a horizontal distance X from the column surfaces 22 and 23 to the joint 26. When the plastic hinge generation position P is changed, the distance X also changes. Therefore, the plastic hinge generation position P can be adjusted by changing the distance X.

  Since the plastic hinge generation position P can be adjusted in this way, the bending stress used for the structural calculation can be controlled. By this control, intentional stress can be generated, so that the design can be simplified. Further, since various patterns as shown in FIG. 6 can be adopted, the degree of freedom in design is high and the procurement of materials is easy.

  Further, since the joint 26 is provided on the joining member or the beam member, it is not necessary to place the concrete on the joint 26 to join the member in the field, and the work for placing the concrete on the site is eliminated, thereby saving labor. Can be planned. Furthermore, by using a good PCa member manufactured at the factory, the frame quality of the structure can be improved.

  Here, the joining member will be described in detail with reference to FIG. FIGS. 7A to 7C are diagrams showing a configuration example of the connection member. The joining member shown in FIG. 7 includes a column joining part 30 for joining to the column member, a beam joining part 31 for projecting in the horizontal direction and joining to the beam member constituting the beam 21, and the column joining part 30 and the beam. A plurality of joint main bars 24 extending in the horizontal direction inside the joint 31 are provided. Although not shown in FIG. 7, the column joint portion 30 is provided with the above-described sheath tube along the edge portion thereof, and can penetrate the column main reinforcement of the column member.

  In the example shown in FIG. 7A, a plurality of joints 26 that connect the joint main bars 24 and the beam main bars 25 are provided at the ends of the two beam joint parts 31. The plurality of joints 26 are spaced apart from each other by a distance X in the horizontal direction from the side surface of the column joint portion 30 constituting a part of the column 20. In this case, a plurality of beam main bars 25 project from the end face of the beam member, and each of the plurality of beam main bars 25 is connected by being inserted into each of the plurality of joints 26.

  In the example shown in FIG. 7B, the joint main bar 24 protrudes from the end surfaces 32 of the two beam joints 31. In this example, the projection length in the horizontal direction of the two beam joint portions 31 is the distance X. In this case, since the plurality of joint main bars 24 protrude from the end face of the joint member, the plurality of joint main bars 24 are connected by being inserted into each of the plurality of joints 26 provided at the end of the beam member. The

  In the example shown in FIG. 7C, one beam joint 31 has a joint 26 as shown in FIG. 7A, and the other beam joint 31 is shown in FIG. 7B. The joint main bar 24 protrudes from the end face 32.

  Here, with reference to FIG. 8, the change of the bending stress by a joint position is demonstrated. As shown in FIG. 8A, by separating the joint position from the column surfaces 22 and 23, the moment at the joint tip position at the time of the earthquake moves to the center side of the beam 21, and the maximum moment of the column surface position is reached. It decreases from M1 to moment M2. For this reason, as shown in FIG. 8B, the joint position can be further reduced from the moment M2 to the moment M3 by separating the joint position from the column surfaces 22 and 23.

  The main bar amount of the beam main bar 25 can be determined by the moment of the joint tip position. For this reason, the main bar amount of the beam main bar 25 can be reduced by separating the joint position from the column surfaces 22 and 23.

  By adjusting the distance by which the joint position is moved to the center side of the beam 21 in this manner, the moment M at the joint tip position can be adjusted. Can be determined. The distance to move the joint position is the above-mentioned distance X, and can be determined according to the construction conditions and design conditions. For example, the transportation restrictions can be eliminated and the transportation plan can be rationalized. The PCa conversion rate of the product can be improved.

  With reference to FIG. 9, the joining method of the joining member arrange | positioned at the pillar 20 and a beam member is demonstrated. In the example shown in FIG. 9A, the joining member 40 has a beam joint 31 and a plurality of joint main bars 24, and the plurality of joint main bars 24 protrude from the end surface 32 of the beam joint 31 and are exposed to the outside. doing. The beam member 41 has a plurality of beam main bars 25, and a plurality of joints 26 are provided at ends of the plurality of beam main bars 25. The plurality of joints 26 are embedded in the end portions of the beam member 41 so as not to protrude from the end portions.

  When connecting the beam member 41, the beam member 41 is lifted and arranged with a crane or the like so that the longitudinal direction of the beam member 41 is in the horizontal direction, and moved toward the column 20 indicated by the arrow line. Each of the plurality of joint main bars 24 is inserted. Then, the grout material is injected into the gap, and the end surface 32 of the beam joint portion 31 of the joining member 40 and the end surface 42 of the beam member 41 can be brought into contact with each other.

  In the example shown in FIG. 9B, the joining member 40 has a beam joint 31 and a plurality of joint principal bars 24, and a plurality of joint members 40 connected to the plurality of joint principal bars 24 at the end of the beam joint 31. The joint 26 is provided. The plurality of joints 26 are embedded in the end portions of the joining member 40 including the beam joint portions 31 so as not to protrude from the beam joint portions 31. The beam member 41 has a plurality of beam main bars 25, and the plurality of beam main bars 25 protrude from the end face 42 of the beam member 41.

  When connecting the beam member 41, the beam member 41 is lifted and arranged with a crane or the like so that the longitudinal direction of the beam member 41 is in the horizontal direction, and moved toward the column 20 indicated by the arrow line. Each of the plurality of beam main bars 25 is inserted. Then, the grout material is injected into the gap, and the end surface 32 of the beam joint portion 31 of the joining member 40 and the end surface 42 of the beam member 41 can be brought into contact with each other.

  In this way, since the end of each main bar is inserted into the joint 26 and the joining of the members is completed by injecting the grout material, the work of installing the formwork and placing the concrete can be omitted. The workability can be improved and the construction period can be shortened.

  So far, the description has been made with reference to an example in which only the high-strength reinforcing bar is used for the joining portion main reinforcement 24 of the joining member 40. However, any method can be adopted as long as the strength of the joining member 40 can be increased. For example, as shown in FIG. 10 showing the second embodiment of the column beam joining method, a material type having the same strength as the beam main reinforcing bar 25 of the beam member 41 is used, and an arbitrary shape such as a U-shape is separately provided. A reinforcing bar 43 can be provided. The reinforcing bar 43 is provided inside so as to extend to the vicinity of the end portion of the beam joint portion 31 projecting to both. That is, it is provided to extend in the horizontal direction from the vicinity of the end of one beam joint to the vicinity of the end of the other beam joint.

  With reference to FIG. 11, the arrangement of the joint main bars 24 and the reinforcing bars 43 in the cross section of the beam joint 31 will be described. FIG. 11A shows an example of two-stage reinforcement, and FIG. 11B shows an example of one-stage reinforcement.

  In the example shown in FIG. 11A, five joint main bars 24 are provided at equal intervals along the edge on the upper surface side of the beam joint portion 31, and the edge portion is also provided on the lower surface side. 5 joint main bars 24 are provided in a U-shape at equal intervals. Two reinforcing bars 43 are provided at the center of the cross section so as to be sandwiched between the ten joint main bars 24. In the beam member 41, the beam main bars 25 are provided in a U-shape at equal intervals in accordance with the arrangement of the joint main bars 24 of the beam connection section 31.

  Further, in FIG. 11A, the upper surface side and the lower surface side joint main bars 24 are each four in a T shape, and two reinforcing bars 43 are arranged on the left and right of the joint main bars 24 in the center of the cross section. An example is also shown. In the beam member 41, the beam main bars 25 are provided in a T-shape at equal intervals in accordance with the arrangement of the joint main bars 24 of the beam connection portion 31. A method of arranging the joint main bars 24 in two stages in this way is called two-stage bar arrangement.

  In the example shown in FIG. 11 (b), four joint main bars 24 are provided at equal intervals on the upper surface side of the beam joint portion 31 along the edge portion, and also along the edge portion on the lower surface side. The four joint main bars 24 are provided at regular intervals in a row. Two reinforcing bars 43 are arranged on each side of the central portion of the cross section. In the beam member 41, the beam main bars 25 are provided in a line at equal intervals in accordance with the arrangement of the joint main bars 24 of the beam connection part 31. A method of arranging the joint main bars 24 in this way is called a one-stage bar arrangement.

  Here, an example of a single-stage bar arrangement and a two-stage bar arrangement has been shown, but it may be arranged in three or more stages, or may be arranged in other shapes at equal intervals. The reinforcing bar 43 is not limited to the U shape, and may be, for example, a rod shape.

  With reference to FIG. 12, a method for manufacturing (designing and manufacturing) the joining member 40 used for the joining structure of the column beam will be described. In addition, since the content of the operation | work in each step is a well-known thing, the description about the detailed content is abbreviate | omitted. Starting from step 1200, in step 1205, a PCa factory for manufacturing the joining member 40 is selected. In the PCa factory, column members and beam members 41 can also be manufactured.

  In step 1210, a transport vehicle that transports the PCa member such as the manufactured joining member 40 is determined. In step 1215, a transportation route on which the transportation vehicle travels to the destination site is determined. In step 1220, the work space at the site is confirmed. For example, the size of the narrowest space when the PCa member is lifted and moved by a crane is checked. This is because there is no point in manufacturing PCa members that do not pass through the space. Note that these steps are not limited to being performed in this order, and may be performed in any order.

  After the construction and design conditions are determined by the above steps, the process proceeds to step 1225, and the plastic hinge generation position P is determined according to the construction and design conditions. The plastic hinge generation position P can be determined by inputting the selected PCa factory or the like as construction conditions into a computer that holds information about the PCa factory or the like as a database. For example, it is possible to determine which of the input conditions is the most severe condition in construction, and determine the plastic hinge generation position P based on the determined condition. Specifically, when the most severe condition is the width of the transport vehicle, for example, the width of the transport vehicle can be the horizontal length of the joining member 40, and both ends of the width can be determined as the plastic hinge generation position P. . The plastic hinge generation position P may be determined by the designer, and the position can be determined so as to be an advantageous condition for construction (so that a severe condition can be avoided).

  In step 1230, the computer selects the joint main reinforcement 24 based on the determined plastic hinge generation position P. The computer holds the information on the material type of the joint principal bar 24 corresponding to the plastic hinge generation position P as a database, and can select the material type in response to the determination of the plastic hinge generation position P. . The computer holds the information shown in FIG. 6, and can select the beam main bar 25 and the joint 26 in addition to the joint main bar 24. Similarly, the designer can select a joint main bar, a beam main bar, a joint, and the like according to the plastic hinge generation position P.

  In step 1235, the projection length in the horizontal direction of the beam joint 31 is determined based on the determined joint main reinforcement 24, the selected joint 26, and the like. Then, necessary structural calculations are performed and the joining member 40 is designed. In step 1240, the designed number of rebars of the determined grade are placed in the designed position in the form assembled to the determined protruding length, and the joint 26 is attached and arranged as necessary. Place concrete. As for concrete, remove the mixed air using a vibrator as necessary, and smooth the surface using a wooden trowel or the like.

  In step 1245, a panel or sheet covering the mold is used, the pipe is drawn into the pipe or sheet, steam is supplied, and steam is blown to the concrete surface to perform steam curing. Here, the steam curing is described as the curing, but it is not limited to the steam curing and may be a wet curing or the like.

  In step 1250, the joining member 40 made of concrete that has developed strength is removed from the mold, and in step 1255, the production ends. Note that the joining member 40 can be manufactured by repeating the steps 1240 to 1250 as many times as necessary.

  As the above computer, a CPU, ROM, RAM, HDD, communication I / F, input / output I / F, input device, PC or tablet terminal equipped with a display device can be used, and the CPU is changed from HDD to RAM. By reading the program and executing the program, the processing for determining the plastic hinge generation position P, the structure calculation, and the like can be performed.

  So far, the column beam connection structure and the manufacturing method of the connection member of the present invention have been described in detail with reference to the embodiment shown in the drawings, but the present invention is not limited to the above-described embodiment, Other embodiments, additions, changes, deletions, and the like can be changed within the scope that can be conceived by those skilled in the art, and as long as the effects and effects of the present invention are exhibited in any aspect, the scope of the present invention is included. It is included.

DESCRIPTION OF SYMBOLS 10 ... Mechanical coupling, 11, 20 ... Column, 12, 21 ... Beam, 14, 40 ... Joining member, 15, 30 ... Column joint, 16, 31 ... Beam joint, 17 ... End face, 18, 24 ... Joining Main bars, 19, 41 ... Beam members, 22, 23 ... Column faces, 25 ... Beam main bars, 26 ... Joints, 32, 42 ... End faces, 43 ... Reinforcing bars

Claims (5)

It is a column beam connection structure,
A column joint portion that is disposed between the column members constituting the column of the structure and is joined to the column member, and a beam that projects in a direction perpendicular to the column and is joined to the beam member constituting the beam. A joining member having a joint, and a plurality of reinforcing bars extending in the vertical direction inside the column joint and the beam joint;
A plurality of joints that are provided at an end of the beam joint or at an end of the beam member and connect the reinforcing bars of the joint member and the reinforcing bars of the beam member;
A plurality of reinforcing bars used for the joining member according to the distance in the vertical direction from the side surface of the column when joining the joining member and the beam member to the ends of the joints on the center side of the beam Is selected, and the protruding length in the vertical direction of the beam joint is determined.   The protrusion length is determined so that the distance is longer than the length of the joint and shorter than a length obtained by adding the length of the joint to the length from the upper surface to the lower surface of the beam. Bonding structure.   In order to reinforce the joint member with a plurality of reinforcing bars used for the joining member, reinforcing bars having a strength higher than that of the plurality of reinforcing bars used for the beam member, or reinforcing bars having the same strength as the plurality of reinforcing bars used for the beam member The joint structure according to claim 1 or 2, wherein a combination of reinforcing bars to be added is selected.   The plurality of reinforcing bars used for the joining member are selected according to the plurality of reinforcing bars used for the beam member or together with the plurality of reinforcing bars used for the beam member. The junction structure described. A column joint portion that is disposed between the column members constituting the column of the structure and is joined to the column member, and a beam that projects in a direction perpendicular to the column and is joined to the beam member constituting the beam. A joining member, a joining member having a plurality of reinforcing bars extending in the vertical direction inside the column joining part and the beam joining part, and provided at an end part of the beam joining part or an end part of the beam member, A method of manufacturing the joining member having a joining structure, including a plurality of joints connecting the reinforcing bars of the joining member and the reinforcing bars of the beam member,
A plurality of reinforcing bars to be used for the joining member are selected according to the distance in the vertical direction from the side surface of the column when joining the joining member and the beam member to a plurality of joints on the center side of the beam. Determining a vertical protrusion length of the beam joint;
Placing the selected plurality of reinforcing bars in a formwork assembled to have the protruding length, and placing concrete;
Curing the cast concrete, and a method for producing a joining member.