JP4382590B2 - Method of joining steel column and steel beam, joining structure thereof and beam bracket for joining - Google Patents

Description

  The present invention relates to a technique for joining a steel column and a steel beam in a steel building. More specifically, the present invention relates to a joining technique of a steel column having a square cross section and a steel beam having an H cross section.

When an external force such as an earthquake acts on a steel structure, the largest bending load acts on the joint between the steel column and the steel beam. Therefore, the fracture at the joint between the steel column and the steel beam becomes a problem, but since this joint is generally welded, the deformation performance is low, brittle and abrupt fracture is likely, There was a problem that it could take away the opportunity of emergency evacuation at times. Therefore, in order to avoid breakage at the welded portion between the beam bracket for joining and the steel column, plasticization is performed prior to the welded portion against an external force such as an earthquake at a position away from the welded portion, and deformation performance is also improved. What provided the big plasticization area | region is disclosed (refer patent document 1). However, this prior art employs a so-called inner diaphragm method or through diaphragm method as the connection structure between the steel column and the steel beam. Due to changes in the width dimension and thickness of the flange part that constitutes the beam bracket, Since the method of ensuring the relative difference regarding the proof stress required in order to form the plasticization area | region which plasticizes ahead of a welding part with respect to external force, the following technical restrictions were accompanied. That is, in the case of the method of changing the thickness of the flange part which comprises a beam bracket, the effort and cost for the process increased greatly. Further, in the case of the method of changing the width dimension of the flange portion, the difference is formed only by the change in the width dimension of the flange portion, so that it is necessary to change the width dimension by a considerable amount. As a result, a large dimensional difference corresponding to the width dimension of the steel column and the steel beam was required. As a result, in order to form a predetermined width dimensional difference between the steel column and the steel beam, there is a restriction that the width size of the steel column must be larger than necessary for its own strength. It was.
Japanese Patent Laid-Open No. 11-140978

Accordingly, the present inventors have also conducted earnest research and development, and each flange of the H-shaped steel material constituting the beam bracket for joining disposed between the end of the H-shaped steel material constituting the steel beam and the steel column. The connection plate is integrally provided in the substantially vertical direction, and the end of the connection plate is welded to the vicinity of the corner of the steel column to join the steel column and the steel beam. Between the portion reinforced by the connecting plate and the connecting portion of the beam bracket and the beam body, forming a plasticized region that causes plastic deformation in advance of the welded portion of the connecting plate and the steel column, A joint structure between a steel column and a steel beam constructed so as to absorb seismic energy ahead of the weld was developed (see Patent Document 2). By the way, in this joining structure of the steel column and the steel beam, the plasticized region in which the plastic deformation occurs prior to the welded portion is connected between the portion reinforced by the connecting plate and the connecting portion of the beam bracket and the beam body. In other words, the technical means that the connecting plate and the portion reinforced by the connecting plate are constructed to have a strength that does not cause plastic deformation prior to the plasticized region in principle. When a large external force is applied, the connecting plate acts as a rigid body on the steel column, so stress concentration tends to occur near the end of the connecting plate, and the steel column side has the strength to withstand it. As a result, the application range for steel columns with a large diameter / thickness ratio D / t is limited, and at least a connecting plate is used as a beam bracket. Since it is necessary length plus the sexual region, in terms such as the total length becomes long and there is room for improvement.
JP 2003-56059 A

  In view of the technical situation as described above, the present invention can reduce the stress concentration occurring in the fixing portion between the steel beam and the connecting plate when a large external force such as an earthquake is applied, and the diameter-thickness ratio D An object of the present invention is to provide a technique for joining a steel column and a steel beam, which is effective in expanding the application range for a steel column having a large / t and can reduce the total length of a beam bracket for joining.

As a result of further research and development by the present inventor, as a result of forming at least a part of the outer part between the fixing side end and the other end of the connecting plate with the steel column, a concave part is formed. By forming a plasticized area in the corresponding part, the stress acting on the fixed part between the steel beam and the connecting plate can be dispersed to greatly reduce the stress concentration. It has been found that it can absorb the external force energy. In this case, by fixing to the steel column side via each connection plate, the steel column and the steel beam are connected in a state where the end of each flange portion on the steel beam side is separated from the steel column. Since the influence of the external force transmitted through the contact portion between the end of each flange portion on the steel beam side and the steel column is eliminated, the force transmission structure between the steel column and the steel beam can be simplified.

  FIG. 1 is a configuration explanatory view showing a comparison between a conventional configuration and a basic configuration of the present invention when a connecting plate is used as an object of an experiment. In the figure, (A) shows the basic configuration of the prior art, (B) shows the basic configuration of the present invention, and Pa and Pb show the approximate positions of the plasticized regions, respectively. FIG. 2 is an explanatory diagram of strain distribution showing the experimental results. As shown in the drawing, in this experiment, for the steel column A, the outer part constituting the beam bracket Ba is a straight connection plate Ca, or the outer part constituting the beam bracket Bb is formed in a concave shape. Steel column in the case where various fixed loads F are applied to steel beams D connected to the beam brackets Ba or Bb as shown in FIG. The magnitude of strain at each part along the welded portion with A is measured by each strain gauge G, and the measured values are plotted to obtain the strain distribution state for each load. The average strain distribution characteristic curve a , B were obtained. The shape and size of the concave portion of the connecting plate can be determined in consideration of the relationship between the strain distribution state and the characteristic curve. According to the experimental results shown in FIG. 2A, when the connecting plate Ca having the linear outer portion is used as shown by the characteristic curve a, the largest distortion is generated at the upper end portion of the connecting plate Ca. It has been found that stress concentration occurs in the vicinity of the upper end portion of the welded portion, which is likely to cause cracks in the welded portion. Further, according to the experimental results shown in FIG. 2 (b), when the connecting plate Cb having a concave outer portion is used as shown by the characteristic curve b, the upper and lower centers of the connecting plate Cb are used. The strain tends to be distributed around the center, and the stress concentration in the vicinity of the upper and lower ends is greatly reduced. Therefore, it was found to be extremely effective in preventing cracks from the weld. Further, in the case of the connecting plate Cb in which the latter outer portion is formed in a concave shape, the distortion gradually increases from the upper and lower end portions of the welded portion toward the central portion, and the distortion rapidly increases at the upper end portion as in the former case. Since it does not change, it was found that it is also effective in expanding the application range for steel columns having a large diameter-thickness ratio D / t. Furthermore, as shown in FIG. 1, it is possible to reduce the overall length of the beam bracket. In addition, in the case of a multi-story building, the length of the beam bracket on the top floor may be adjusted to the size of the bottom floor so that the length of the beam bracket is not intentionally shortened. Even when the length of the concave portion remains long, the presence of the concave portion is effective in terms of stress relaxation in the welded portion and formation of a plasticized region in the connecting plate portion.

In the present invention, paying attention to the above points, as the means for joining the steel column with the square cross section and the steel beam with the H cross section , each flange portion in the vicinity of the joint end of the H-shaped steel material constituting the steel beam, or A connecting plate is integrally provided in a substantially vertical direction with respect to each flange portion of the H-shaped steel material constituting the beam bracket for joining disposed between the end portion of the steel beam and the steel column. By connecting to the steel column side through the plate for steel , the steel column and the steel beam are configured to be connected in a state where the ends of the flange portions on the steel beam side are separated from the steel column , and by reducing the plastic section modulus to an intermediate portion of the connecting plate ahead of the solid bonding portion between the connecting plate and the steel column to form a plasticized region that causes plastic deformation, an external earthquake or the like by該塑resistance region Absorb energy prior to the adhering part By adopted the basic technical means of avoiding the destruction of the fixing portion of the connecting plate and the steel columns.

Further , it is configured to connect the steel column and the steel beam by fixing the end of the connecting plate near the corner of the steel column, and the fixing side end of the connecting plate to the steel column; By forming at least a part of the outer portion between the other end portion in a concave shape, a plasticizing region that causes plastic deformation in advance of the fixing portion between the connecting plate and the steel column corresponding to the concave portion. Can be easily formed. In addition, each flange part of the said H-shaped steel material may be a flange part near the joining end part of the H-shaped steel material that constitutes the steel beam itself as described above, or between the steel beam and the steel column. The flange part of the H-shaped steel material which comprises the beam bracket for joining arrange | positioned may be sufficient. In addition, providing the connecting plate integrally with each flange portion in a substantially vertical direction is not only a form in which the connecting plate is directly provided on the side of each flange portion, but also each flange portion. May be provided indirectly via a fitting. Furthermore, not only is the connecting plate integrally provided by welding or other fixing means for each flange portion or fitting of the H-shaped steel material, but also the connecting plate is integrated with the flange portion or fitting. It may be formed. In short, what is necessary is just to connect a steel column and a steel beam through the said connection plate integrally provided in the substantially perpendicular direction directly or indirectly with respect to each flange part. In addition, if at least a part of the concave portion formed on the outer side portion of the connecting plate is a curved portion, and the plasticized region is formed corresponding to the curved portion, the abrupt with a wider width. A stable plasticized region with little change can be formed.

According to the present invention, the following effects can be obtained.
(1) as well as configured to couple through a connecting plate and a steel beam of the steel column and H-shaped cross section of rectangular cross-section, the plasticized region by reducing the plastic section modulus of the intermediate portion of the connecting plate Since the technical means of forming is employed, the optimum plasticized region can be formed easily and accurately simply by selecting the plastic section modulus of the connecting plate .
(2) It is possible to disperse the stress acting on the fixing portion between the steel column and the connecting plate , and in particular, the stress concentration at the upper and lower ends of the fixing portion can be greatly reduced. Therefore, it is possible to avoid cracks in the welded portion between the steel column and the connecting plate, and it is also effective in expanding the application range for a steel column having a large diameter / thickness ratio D / t.
(3) Moreover, by connecting to the steel column side via each connecting plate, the steel column and the steel beam are connected in a state where the end of each flange portion on the steel beam side is separated from the steel column. Therefore, the influence of the external force transmitted through the contact portion between the end of each flange on the steel beam side and the steel column is eliminated, so that the situation where the steel column is twisted through the flange is avoided. The structure of force transmission with the beam is simplified.
(4) Therefore, the original function of the plasticized region provided in the connecting plate is accurately exhibited without being disturbed by the external force transmitted to the steel column through the flange portion on the steel beam side.
(5) by the selection on the shape of the concave portion for forming the outer portion of the connecting plate, the plasticized region of the optimum can be formed easily and accurately.
( 6 ) Since the plasticized region is formed in the middle portion of the connecting plate , the entire length of the joining beam bracket can be reduced accordingly.
( 7 ) Since the outer portion of the connecting plate is formed in a concave shape, the concrete cover thickness from the outer edge of the concave portion to the upper surface of the slab can be increased by the amount of the concave portion. In addition, there is no restriction on thickening the slab.

INDUSTRIAL APPLICABILITY The present invention can be widely applied as a means for joining a steel column and a steel beam that connect a steel column having a square cross section and a steel beam having an H-shaped cross section. The square cross section may be a square or a rectangular cross section as long as the cross section has a substantially square shape. The connecting plate is formed so that the length of the fixing side end with the steel column is the same as that of the other end, or longer than the other end as in the embodiments described later, and the fixing side end and the other end. By forming at least a part of the outer portion between them in a concave shape as compared with the straight line connecting the fixed-side end portion and the other end portion, a plasticized region can be easily formed. For example, the dent amount on the outer side is relatively small and the outer shape as the connecting plate is close to a triangle, the dent amount is large, and the outer shape is close to a T-shape, or the fixed side end and the other end Various forms are possible up to the cross-sectional outer shape of the spinning wheel when the difference in length is small. Setting plastic section modulus of the connecting plate, for example, dented and specific shape of the outer portion of the connecting plate, setting on the dimensions and the like, Ya distribution of stress acting on the anchoring portion of the coupling plate and steel columns Therefore, the selection is made in consideration of the setting state of the target plasticizing region. Moreover, the recessed part formed in the outer side part of the plate for connection may be formed over the full length from the adhering side edge part to a steel column to the other end part, and may be formed partially. The concave portion formed on the outer side of the connecting plate may be formed from a curve or a straight line over the entire length of the concave portion, or may be a combination of a curved portion and a linear portion. Incidentally, in order to form a wide range of plasticized regions with little sudden change, the entire concave portion corresponding to the plasticized region is formed with a curved portion, or a straight line connected in the tangential direction with the curved portion. It is effective if it is formed from a combination with the shape portion. Further, the connecting plate is a flange portion in the vicinity of the joining end portion of the H-shaped steel material constituting the steel beam itself, or the H-shaped steel material constituting the joining beam bracket disposed between the steel beam and the steel column. A configuration in which the flange portion is symmetrically installed on the top and bottom with respect to the flange portion is optimal, but a configuration in which the flange portion is disposed on the upper or lower side of the flange portion is also possible. The connecting plate is not only a form directly provided against the side of each flange portion, it may be indirectly provided via a flat portion of the specification mouthpiece thereof.

FIG. 3 is a perspective view showing a joint portion between a steel column and a steel beam according to an embodiment of the present invention, FIG. 4 is a partial front view showing the steel beam in one direction, and FIG. It is a partial top view regarding a steel beam . In the figure , reference numeral 1 is a steel column having a square cross section, and 2 is a steel beam having an H-shaped cross section. As shown in the figure, in this embodiment, the steel beam 2 is joined to four surfaces around the steel column 1. Was illustrated. Beam brackets 3 for connecting the steel beams 2 to the steel columns 1 are installed on the four surfaces of the steel columns 1 corresponding to the steel beams 2, and the steel columns 1 and the steel frames are connected via the beam brackets 3. A joining structure for joining the beam 2 is employed. As shown in the drawing, the beam bracket 3 includes upper and lower flange portions 6 and 7 corresponding to the upper flange portion 4 and the lower flange portion 5 of the steel beam 2 and a central portion connecting the flange portions 6 and 7. It is comprised from the web 8 and the connection plates 9 and 10 welded perpendicularly to the both sides of the upper and lower flange parts 6 and 7. Then, the upper and lower flange portions 6 and 7 and the web 11 of the steel beam 2 are connected to the upper and lower flange portions 6 and 7 and the web 8 of the beam bracket 3 by connecting means 12 to 14 using connecting plates and bolts and nuts, respectively. By doing so, the steel column 1 and the steel beam 2 are joined via the beam bracket 3. Note that the end portions of the flange portions 6 and 7 of the beam bracket 3 and the steel column 1 are not welded, and the end portions of the flange portions 6 and 7 are separated from the steel column 1 as shown in FIG. Shall. With respect to the space between the end portion of the web 8 and the steel column 1, it may be configured to weld so as to accurately support the shear load via the web 8, and the connection plate 9 including the shear load may be included. , 10 so that the end portion of the web 8 and the steel column 1 are separated from each other, or may be positioned via an appropriate positioning means.

  As shown in FIG. 4, the upper and lower outer portions of the connecting plates 9 and 10 welded perpendicularly to both side portions of the upper and lower flange portions 6 and 7 of the beam bracket 3 in this embodiment are curved portions 15. ˜18 and the remaining linear portion are formed in a concave shape, thereby forming a plasticized region P at a predetermined position in the connecting plates 9 and 10. As described above, the feature of the present invention is in this point, and the above-described effects can be obtained. Incidentally, since the welded portions 19 and 20 with the steel column 1 are set in the vicinity of the corners of the steel column 1 as shown in FIG. Will be formed. Accordingly, the connection plates 9 and 10 are also tapered in the installation state when viewed from the vertical direction. FIG. 6 is a schematic explanatory view showing the relationship with the slab, and FIG. 7 is a partially enlarged view thereof. As shown in the figure, when the concrete 22 for the slab 21 is placed on the upper part of the steel beam 2, as shown in the enlarged view of FIG. Further, since the cover thickness of the concrete 22 is increased by the depression of the connecting plates 9 and 10 by the amount indicated by hatching 23, the thermal conductivity with respect to the connecting plates 9 and 10 is reduced accordingly, and the fire resistance is improved. Therefore, the necessity of thickening the concrete 22 for the slab 21 more than necessary from the viewpoint of fire prevention by heat conduction to the connecting plate is almost eliminated.

  8 to 14 are component front views illustrating various specific examples related to the shape of the connecting plate. FIG. 8 shows the basic form used for the connecting plate 9, and the outer part between the fixing side end 24 and the other end 25 is combined with arcs having different curvature radii. The curved portions 15 and 16 and the remaining straight portions 26 and 27 are formed in a concave shape. Then, when the concave portions are formed using the curved portions 15 and 16 and the linear portions 26 and 27, as described above, at what position of the connecting plate, how much width of the plasticized region is formed. The specific setting is made in consideration of the relationship with the formation state of the target plasticized region. Incidentally, the end portions of the curvilinear portions 15 and 16 and the other end portion 25 may be connected by oblique lines according to circumstances.

  Similarly, the connecting plate 28 shown in FIG. 9 is formed in a concave shape from curved portions 29 and 30 made of arcs and the remaining straight portions 31 and 32. The connecting plate 33 shown in FIG. 10 is formed in a concave shape from linear portions 34 and 35, curved portions 36 and 37 formed of arcs, and remaining linear portions 38 and 39. The connecting plate 40 shown in FIG. 11 is formed in a concave shape from linear portions 41 and 42 and curved portions 43 and 44 formed of remaining arcs. The connecting plate 45 shown in FIG. 12 is formed in a concave shape from straight portions 46 and 47, curved portions 48 and 49 formed of arcs, and the remaining straight portions 50 and 51. The connecting plate 52 shown in FIG. 13 is formed in a concave shape from linear portions 53, 54, curved portions 55, 56 made of arcs, and curved portions 57, 58 made of remaining arcs. The connecting plate 59 shown in FIG. 14 is formed in a concave shape from curved portions 60, 61 made of arcs and curved portions 62, 63 made of arcs having different radii. As described above, various forms are possible by appropriately combining curves and straight lines. In the above embodiment, the case where an arc-shaped curve is used has been described from the viewpoint of processing, but it goes without saying that other free curves can be used.

15 is a perspective view showing a joint portion between a steel column and a steel beam according to another embodiment of the present invention. FIG. 16 is a partial front view showing the steel beam in one direction, FIG. These are the partial top views regarding the steel beam. As shown in the figure, also in this embodiment, there is no difference from the above embodiment in that the steel beam 2 is joined to the steel column 1. In the present embodiment, the H-shaped steel material constituting the joining beam bracket 64 is one in which the outer portions of the upper and lower flange portions 65 and 66 are formed in parallel, and the outer portions of the flange portions 65 and 66 are used. In addition, the flange portions 65 and 66 are configured to be welded by adjusting the orientation of the connecting plates 69 and 70 so as to be adapted to the welded portion with the steel column 1 with appropriate spacers 67 and 68 interposed therebetween. The web 71 in between is configured to be connected to the steel column 1 side by inserting a bolt into a bolt insertion hole formed in the positioning connection plate 72 installed on the steel column 1 side and tightening and fixing with a nut. It has features in that. Incidentally, in this embodiment, the web 71 is configured to be connected to the steel column 1 side, but the end portions of the flange portions 65 and 66 themselves are separated from the steel column 1 as shown in FIG. There is no difference from the above-described embodiment in that it is described. Moreover, although the present Example demonstrated the case where it applied to the form which joins the steel column 1 and the steel beam 2 using the beam bracket 64 for joining, steel frame by the positioning connection plate 72 installed in the steel column 1 side. Since the H-shaped steel web itself constituting the beam 2 can be connected and temporarily supported, the connecting plate provided integrally with the flange portion of the steel beam 2 itself without using the beam bracket 64 It also fits well in the form of joining directly to the steel column 1 via Further , as described above, when the connecting plate is integrally provided in a substantially vertical direction with respect to each flange portion constituting the H-shaped steel material constituting the beam bracket or the steel beam itself, as in the above embodiment. By forming the outer portion of the flange portion in a tapered shape, the direction of the connecting plate may be adapted to be adapted to the welding location with the steel column 1, or the flange portion as in this embodiment. You may comprise so that direction of a connection plate may be adapted to the welding location with the steel column 1 by interposing a suitable spacer between an outer part and a connection plate.

18 to 22 show H-shapes that constitute beam brackets for joining disposed between the flange portions near the joint end portions of the H-shaped steel members constituting the steel beam or the end portions of the steel beam and the steel columns. FIG. 18 is a perspective view, FIG. 19 is a front view, FIG. 20 is a plan view, and FIG. 21 is a fitting for integrally providing a connecting plate to each flange portion of a steel material. The right side view and FIG. 22 are left side views. In the figure, reference numeral 73 denotes a fitting, a flat plate portion 74 that is fixed in a superposed state to the upper and lower flange portions of the H-shaped steel material, and a connecting plate that is welded vertically to both sides of the flat plate portion 74. 75, 76. The flat plate portion 74 and the connecting plates 75 and 76 are formed in a tapered shape depending on the case so that the orientation of the connecting plates 75 and 76 can be adapted from the relationship between the fixing portion of the steel column 1 and the steel beam 2. Is done. The fitting 73 in this embodiment is used by fixing the flat plate portion 74 to the steel beam 2 itself or the flange portion of the beam brackets 3 and 64 by fixing means such as welding or bolts and nuts. . In the present embodiment, the case where the flat plate portion 74 is constituted by a single plate is shown, but the flat plate portion may be divided into left and right to be configured as a fitting for each connecting plate. In the figure, reference numeral 77 denotes a welded portion by fillet welding or partial penetration welding applied to a connecting portion between the flat plate portion 74 and the connecting plates 75 and 76, and 78 and 79 denote groove portions for welding to the steel column 1. Is.

It is the structure explanatory drawing which compared and showed the prior art used as experiment object, and the fundamental structure of this invention. It is explanatory drawing of distortion distribution which showed the experimental result. It is the perspective view which showed the junction part of the steel column and steel beam which concern on the Example of this invention. It is the partial front view shown paying attention to the steel beam of one direction in FIG. It is a partial top view regarding the steel beam. It is the schematic explanatory drawing which showed the relationship with a slab. FIG. 7 is a partially enlarged view of FIG. It is the components front view which showed the specific example regarding the shape of the plate for connection. It is the components front view which showed the specific example regarding the same shape. It is the components front view which showed the specific example regarding the same shape. It is the components front view which showed the specific example regarding the same shape. It is the components front view which showed the specific example regarding the same shape. It is the components front view which showed the specific example regarding the same shape. It is the components front view which showed the specific example regarding the same shape. It is the perspective view which showed the junctional part of the steel column and steel beam which concern on the other Example of this invention. It is the partial front view shown paying attention to the steel beam of one direction in FIG. It is a partial top view regarding the steel beam. It is the perspective view which illustrated the fitting metal fitting. It is a front view of the joint fitting. It is a top view of the joint fitting. It is a right view of the joint fitting. It is a left view of the joint fitting.

  DESCRIPTION OF SYMBOLS 1 ... Steel column, 2 ... Steel beam, 3 ... Beam bracket for connection, 4-7 ... Flange part, 8 ... Web, 9, 10 ... Connection plate, 11 ... Web, 12-14 ... Connection means, 15-18 ... Curve-shaped part, 26,27 ... Linear part, 28,33,40,45,52,59 ... Connecting plate, 64 ... Joint beam bracket, 69,70 ... Connecting plate, 72 ... Positioning and connecting plate 73 ... metal fitting, 74 ... flat plate portion, 75,76 ... connecting plate

Claims (8)

A method of joining a steel column and a steel beam for connecting a steel column with a square cross section and a steel beam with an H cross section , each flange portion near the joint end of the H-shaped steel material constituting the steel beam or the steel frame A connecting plate is integrally provided in a substantially vertical direction with respect to each flange portion of the H-shaped steel material constituting the beam bracket for joining disposed between the end portion of the beam and the steel column. By connecting to the steel column side through the plate , the steel column and the steel beam are connected in a state where the end portions of the flange portions on the steel beam side are separated from the steel column, and the connection plate plastic section modulus and smaller ahead solid bonding portion between the connecting plate and the steel column to form a plasticized region that causes plastic deformation in the intermediate portion, the fixed external energy such as an earthquake by該塑resistance region Patent and Turkey previously imbibed from part Method of joining the steel column and the steel beam to be. By fixing the ends of the connecting plate near the corner of the steel columns, with coupling in a state where the ends of the flange portions of the steel column and the steel beam that steel beam side remote from the steel columns The at least part of the outer part between the fixing side end and the other end of the connecting plate is formed in a concave shape, and the connecting part between the connecting plate and the steel column corresponds to the concave part. prior to the bonding method between the steel column and the steel beam according to claim 1, wherein the forming the plasticized region to cause plastic deformation. A steel column and a steel beam connection structure connecting a steel column with a square cross section and a steel beam with an H cross section , each flange portion near the joint end of the H-shaped steel material constituting the steel beam or the steel frame A connecting plate is integrally provided in a substantially vertical direction with respect to each flange portion of the H-shaped steel material constituting the beam bracket for joining disposed between the end portion of the beam and the steel column. By fixing the end of the plate in the vicinity of the corner of the steel column , the steel column and the steel beam are connected so that the end of each flange on the side of the steel beam is separated from the steel column. And at least part of the outer portion between the fixing side end and the other end of the connecting plate is formed in a concave shape, and the fixing portion between the connecting plate and the steel column corresponding to the concave portion. Forming a plasticized region that causes plastic deformation earlier Junction structure between steel column and steel beam, characterized. It said provided one body manner in a direction substantially perpendicular to the coupling plate via a flat portion constituting the specification mouthpiece product is secured to the flange portions of the H-shaped steel with respect to the respective flange portions, the connecting plates The joining structure of the steel column and the steel beam according to claim 3 constituted so that it may join with a steel column side via.   The steel column and the steel beam according to claim 3 or 4, wherein at least a part of the concave portion formed on the outer portion of the connecting plate is a curved portion, and the plasticized region is formed corresponding to the curved portion. Bonding structure with. A beam bracket for joining a steel column and a steel beam, which is disposed between the steel column and the end of the steel beam, and is substantially for each flange portion of the H-shaped steel material constituting the joining beam bracket. The connecting plates are integrally provided in the vertical direction, and the end portions of the connecting plates are fixed to the vicinity of the corners of the steel column, thereby connecting the steel column and the steel beam to the end of each flange portion. The coupling plate is configured to be connected in a state of being separated from the column , and at least a part of the outer portion between the fixing side end portion and the other end portion of the connection plate is formed in a concave shape to correspond to the concave portion. A beam bracket for joining a steel column and a steel beam, characterized in that a plasticized region in which plastic deformation occurs before the fixing portion between the connecting plate and the steel column is formed. In one body manner in a direction substantially perpendicular to the coupling plate via a flat portion constituting the specification mouthpiece product is secured to the flange portions of the H-shaped steel which constitutes the joining beam brackets to the respective flange portions The beam bracket for joining a steel column and a steel beam according to claim 6, wherein the beam bracket is provided and joined to the steel column side via the connecting plate.   The steel column and the steel beam according to claim 6 or 7, wherein at least a part of the concave portion formed on the outer portion of the connecting plate is a curved portion, and the plasticized region is formed corresponding to the curved portion. Beam bracket for joining with.

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