Beam-to-column joint structure and beam frame structure

Abstract

To provide: a beam-to-column joint structure that can expand the effective dimensions of a space under a beam and reduce costs by eliminating the risk of column collapse in beam-priority rigid frame structure and by eliminating the need to install a separate column that only receives the load of a reinforcing beam, in addition to the column that receives horizontal forces; and beam frame structure using the beam-to-column joint structure.SOLUTION: A beam-column joint structure 1a includes reinforcing beams 3 each having a horizontally long body part 30 and a reinforcing part 31 fixed along a lower surface of the body part 30, and rigid frame columns 4 each having an upper end to which an end of the reinforcing beams 3 is joined and supporting the end of the reinforcing beams 3. At the end of the reinforcing beam 3, a main body projection part 37 where the main body part 30 projects longer than the reinforcing part 31 in the longitudinal direction is formed, and the upper end of the rigid frame column 4 abuts on the lower surface of the main body projection part 37 and is rigidly joined.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a beam-to-column joint structure and a beam frame structure using the beam-to-column joint structure. [Background technology]

[0002] In recent years, in order to form a wider column-free space, a reinforced beam has been proposed in which a steel reinforcing part is fixed to the lower side along the beam body to reinforce the beam body and to enable it to be used for a longer span. For example, the reinforced beam described in Patent Documents 1 and 2 is formed by fixing a CT steel with an inverted T-shaped cross section to the lower flange of an H-shaped steel beam body with flanges on the top and bottom. This reinforced beam has a higher strength than a general H-shaped steel beam, so the distance between the columns and beams that serve as the fulcrum of the reinforced beam can be increased, and a wider column-free space can be formed.

[0003] Patent Document 3 describes a portal frame that includes a ladder beam in which the upper chord and the lower chord are connected by multiple vertical members, and a ladder column in which two columns are connected by multiple horizontal members. This makes it possible to form a large-span opening. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent Publication No. 2022-28248 [Patent Document 2] JP 2023-78554 A [Patent Document 3] Patent Publication No. 2022-142955 Summary of the Invention [Problem to be solved by the invention]

[0005] However, when rigidly connecting a reinforcing beam and a rigid frame column in a rigid frame structure, the reinforcing part and the rigid frame column interfere with each other, making it difficult to perform construction using a beam-first method. Therefore, when adopting a beam-first method, the rigid frame column is connected to another unreinforced beam, and the end of the reinforcing beam is connected to the beam. In this case, it becomes necessary to place a support column in addition to the rigid frame column to support the load of the reinforcing beam.

[0006] Furthermore, in a rigid frame structure, if only the beams are reinforced, the strength of the rigid frame columns will be relatively weak, which may lead to the structurally disadvantageous collapse of the columns.

[0007] Therefore, the present invention aims to provide a beam-to-column joint structure which eliminates the risk of column collapse even in beam-dominated rigid frame structures, does not require the installation of a separate column to bear only the load of the reinforcing beam, and can increase the effective size of the space under the beam while reducing costs, and a beam frame structure using the beam-to-column joint structure. [Means for solving the problem]

[0008] In order to solve the above-mentioned problems, the first invention of the present application is a joint structure between a beam and a column, comprising: a reinforcing beam having a horizontally long main body portion and a reinforcing portion fixed along the underside of the main body portion; and a rigid frame column having an upper end to which the end of the reinforcing beam is joined, the end of the reinforcing beam having a main body protrusion formed in which the main body portion protrudes longer in the longitudinal direction than the reinforcing portion, and the upper end of the rigid frame column is rigidly joined by abutting the underside of the main body protrusion.

[0009] The second invention of the present application is a beam-column joint structure of the first invention, wherein the main body portion is an H-shaped steel having flanges formed on the top and bottom, and the reinforcing portion is a CT steel having a web arranged upward and a flange formed on the bottom.

[0010] The third invention of the present application is a beam-column joint structure according to the second invention, wherein the rigid frame column comprises an H-shaped steel column body and a horizontal flat upper end plate fixed to the upper end of the column body.

[0011] The fourth invention of the present application is a beam-column joint structure of the third invention, wherein the upper end plate has two flat plate sections fixed to the upper ends of the two flanges of the column body, respectively, and extending horizontally, and a connection section along the upper end of the web of the column body, the connection section being formed so that the length in the flange width direction of the column body is narrower than the two flat plate sections and connects the two flat plate sections, and the flat plate section is flat and has structural joint holes formed therein for inserting bolts that join to the lower flange of the main body part of the reinforcing beam, and when the upper end plate is joined to the lower flange of the main body part, exterior fixing holes formed in the lower flange of the main body part on the side of the connection section and for fixing exterior components of the building are exposed.

[0012] The fifth invention of the present application is a beam-to-column joint structure of the third invention, wherein the upper end plate and the reinforcing portion are arranged with a gap between them.

[0013] The sixth invention of the present application is a beam-to-column joint structure of the fourth invention, wherein the reinforcing beam is bolted to the two flat plate portions with the lower surface of the main body protrusion abutting the entire upper surface of the upper end plate.

[0014] The seventh invention of the present application is a beam-column joint structure of the fourth invention, wherein the underside of the main body protrusion of the reinforcing beam abuts against one flat portion of the upper end plate and is bolted, and a beam erected in a direction perpendicular to the reinforcing beam is bolted to the other flat portion of the upper end plate.

[0015] The eighth invention of the present application is a beam frame structure, wherein the reinforcing beam has both ends of the main body portion protruding longer in the longitudinal direction than the reinforcing portion to form the main body protrusion portion, and the rigid frame columns are erected at both ends of the reinforcing beam, and a beam-column joint structure of any of the above-mentioned 1 to 7 is provided at each end of the reinforcing beam, and the reinforcing beam is erected between the two rigid frame columns.

[0016] The ninth invention of the present application is a beam frame structure, in which at least one end of the main body portion protrudes longer in the longitudinal direction than the reinforcing portion to form the main body protrusion portion, and the rigid frame column is erected on at least one end of the reinforcing beam, and a beam-column joint structure as described above in any one of the first to seventh aspects is provided on one end of the reinforcing beam. Effect of the Invention

[0017] According to the first invention of the present application, the reinforcing beam has a main body protruding portion at its end, which protrudes longer in the longitudinal direction than the reinforcing portion, so that the main body protruding portion is not reinforced by the reinforcing portion, and the upper end of the rigid frame column is rigidly connected to the lower surface of the main body protruding portion, which is the unreinforced portion, and thus the rigid frame structure is a beam-reinforced rigid frame structure, but the column collapse is unlikely to occur. In addition, since the main body protruding portion is rigidly connected directly to the rigid frame column, the rigid frame column can bear both the horizontal force and the vertical load of the reinforcing beam, and there is no need to install a separate column that bears only the load of the reinforcing beam. Therefore, compared to the case where a separate column is provided, the effective size of the space under the beam can be expanded and costs can be reduced.

[0018] According to the second invention of the present application, in addition to the effects of the first invention, the main body is an H-shaped steel, and the reinforcing part is a CT-shaped steel with a web facing upward and a flange formed on the lower side, so that the reinforcing part is open toward the side. Since the main body is an H-shaped steel like a general beam, a desired member to be attached to a beam, such as an exterior material, can be attached with the same fitting and the same joining member as when it is attached to a general beam, and there is no need to design a new part to attach the member, so that an increase in cost can be suppressed. In particular, when attaching a desired member to the lower flange of the main body, since the reinforcing part is a CT steel, the flange of the reinforcing part is not placed overlapping the flange of the main body, and since the reinforcing part is open toward the side, the desired member can be easily attached in the conventional fitting without interference from the reinforcing part.

[0019] According to the third invention of the present application, in addition to the effects of the second invention, the rigid frame column comprises an H-shaped steel column body and a horizontal flat upper end plate fixed to the upper end of the column body, so that the upper end plate can be easily attached by abutting against the underside of the lower flange of the main body of the reinforcing beam.

[0020] According to the fourth invention of the present application, in addition to the effects of the third invention, the upper end plate of the rigid frame column has two flat plate sections fixed respectively to the upper ends of the two flanges of the column body and extending horizontally, and a connecting section formed narrower than the two flat plate sections along the upper end of the web of the column body and connecting the two flat plate sections, and a structural joining hole for joining the reinforcing beam to the rigid frame column is formed in the flat plate section, and since the connecting section is narrow, the lower flange of the main body section of the reinforcing beam is exposed on the side of the connecting section, and the exterior fixing hole formed in the lower flange is exposed, so that the exterior member can be attached to the main body section of the reinforcing column without interfering with the upper end plate.

[0021] According to the fifth invention of the present application, in addition to the effects of the third invention, the upper end plate and the reinforcing portion are arranged with a gap between them, which makes it easier to perform the bolt connection work between the upper end plate and the main body of the reinforcing beam, and the gap also makes it easier to wrap fire-resistant covering material around the reinforcing beam.

[0022] According to the sixth invention of the present application, in addition to the effects of the fourth invention, the reinforcing beam is bolted to the two flat plate portions with the lower surface of the main body protrusion abutting the entire upper surface of the upper end plate, so that the end of the reinforcing beam and the capital of the rigid frame column can be rigidly joined with sufficient strength, and the rigid frame column can fully withstand the vertical load and horizontal strength of the reinforcing beam.

[0023] According to the seventh invention of the present application, in addition to the effects of the fourth invention, the reinforcing beam is rigidly connected by abutting the lower surface of the main body protruding part against one flat plate part of the upper end plate and bolting it, and the beam erected in a direction perpendicular to the reinforcing beam is bolted to the other flat plate part of the upper end plate, so that the load of the perpendicular beam can also be supported by the rigid frame column, and since there is no need to provide a separate column, the effective space under the beam can be expanded. Also, since a beam perpendicular to the reinforcing beam can be arranged as necessary, the degree of freedom in design can be increased, for example, when a cantilever eaves is protruding in a direction perpendicular to the reinforcing beam.

[0024] According to the eighth invention of the present application, any one of the beam-column joint structures 1 to 7 described above is provided at both ends of the reinforcing beam, and the reinforcing beam is erected between two rigid frame columns. Therefore, both ends of the reinforcing beam can be made into a strong portal-type rigid frame structure with a beam-supported structure, while the structure is less susceptible to column collapse. Since the reinforcing beam with a beam-supported structure is rigidly joined directly to the rigid frame columns, there is no need to install a column separate from the rigid frame columns, and the space under the beam between the two rigid frame columns can be utilized to the maximum extent possible.

[0025] According to the ninth invention of the present application, one end of the reinforcing beam is provided with a beam-column joint structure of any one of the first to seventh types described above, so that one end of the reinforcing beam can be fixed to the rigid frame column with the beam attached, while making the structure less susceptible to column collapse, and the structure supporting the other end of the reinforcing beam can be freely designed, thereby increasing the design freedom of the space adjacent to the beam frame structure. [Brief description of the drawings]

[0026] [Figure 1]FIG. 2 is a partially omitted front view illustrating the beam frame structure according to the first embodiment. [Diagram 2] FIG. 2 is a partially omitted front view illustrating the joint structure between a beam and a column according to the first embodiment. [Diagram 3] 3 is a cross-sectional view taken along line AA in FIG. 2 for explaining the arrangement of an upper end plate of the beam-column joint structure of the first embodiment. FIG. [Figure 4] FIG. 2 is an exploded perspective view illustrating a joint structure between a beam and a column according to the first embodiment, with some parts omitted. [Diagram 5] FIG. 11 is a partially omitted front view illustrating a beam frame structure according to a second embodiment. [Figure 6] FIG. 11 is a partially omitted front view illustrating a joint structure between a beam and a column according to a second embodiment. [Figure 7] 7 is a cross-sectional view of line BB in FIG. 6 for explaining the arrangement of the upper end plate of the beam-column joint structure of the second embodiment. FIG. [Figure 8] FIG. 11 is an exploded perspective view illustrating a joint structure between a beam and a column according to a second embodiment, with some parts omitted. [Figure 9] FIG. 13 is a partially omitted front view illustrating a beam frame structure according to a third embodiment. [Figure 10] FIG. 11 is a partially omitted cross-sectional view illustrating a joint between a support column and a reinforcing beam in a third embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0027] [First embodiment] Hereinafter, a first embodiment of the beam-column joint structures 1a, 1b and beam frame structures 2a, 2b, 2c including the beam-column joint structures 1a, 1b according to the present invention will be described with reference to Figs. 1 to 4. The beam frame structure 2a is a structure used as part of the structural frame of a building having a heavy steel frame rigid frame structure, and forms a large column-free space under the beams of the beam frame structure 2a. Note that the building in which the beam frame structure 2a is used is not limited to a heavy steel frame rigid frame structure, and may be, for example, a combination of a heavy steel frame rigid frame structure and another structure such as reinforced concrete construction.

[0028] 1, the beam frame structure 2a in this embodiment is a gate-type rigid frame structure in which rigid frame columns 4 are erected at both ends of a reinforcing beam 3, and both ends of the reinforcing beam 3 and each rigid frame column 4 are joined by a beam-column joint structure 1a of this embodiment described below, thereby erecting the reinforcing beam 3 between the two rigid frame columns 4. The beam-column joint structure 1a in this embodiment is a structure that joins a reinforcing beam 3 having a horizontally long main body portion 30 and a reinforcing portion 31 fixed along the lower surface of the main body portion 30, to a rigid frame column 4 having an upper end to which an end of the reinforcing beam 3 is joined and supporting the end of the reinforcing beam 3.

[0029] As shown in Figs. 2 and 4, the main body 30 of the reinforcing beam 3 is an H-shaped steel in which upper and lower flanges 32, 33 are arranged horizontally and parallel to each other, and a vertical web 34 is formed to connect the upper and lower flanges 32, 33. The main body 30 is formed, for example, with a width of 125 mm and a height of 250 mm, and is formed with a large span of a length of more than 6 m. The H-shaped steel forming the main body 30 is preferably an H-shaped steel that is generally used as a beam in heavy steel-framed buildings. By forming the main body 30 with an H-shaped steel that is generally used as a beam, members such as exterior materials (not shown) that are attached to general beams and structural members such as other beams or columns can be fixed to the main body 30 of the reinforcing beam 3 without changing the shape or dimensions, and an increase in the number of members due to the use of the reinforcing beam 3 can be suppressed. The upper and lower flanges 32, 33 of the main body 30 each have a plurality of holes into which a bolt can be inserted arranged in the longitudinal direction, making it possible to attach desired members such as exterior materials and to join the main body 30 to the column head or column base of each column.

[0030] The reinforcing part 31 of the reinforcing beam 3 is a CT steel with a web 35 facing upward and a flange 36 horizontally disposed on the lower side, with an inverted T-shaped cross section. The flange width of the reinforcing part 31 is the same as the flange width of the main body part 30, and the flange width is formed to be 125 mm, for example, and the height of the reinforcing part 31 is formed to be 200 mm. The length of the reinforcing part 31 is formed to be shorter than the length of the main body part 30, for example, by 800 mm or more, and both ends of the main body part 30 protrude 400 mm or more longer than both ends of the reinforcing part 31 to form a main body protrusion 37. The upper end of the web 35 of the reinforcing part 31 is welded to the center of the width direction of the lower surface of the main body part 30, so that the flange 36 of the reinforcing part 31 is horizontally and parallel to the upper and lower flanges 32, 33 of the main body part 30, and the reinforcing part 31 reinforces the main body part 30 of the H-shaped steel.

[0031] The dimensions of each part of the reinforcing beam 3 are not limited to those described above, and are not particularly limited as long as the necessary strength can be obtained for the reinforcing beam 3 and the upper end of the rigid frame column 4 can abut against the underside of the main body protrusion 37 of the reinforcing part 31.

[0032] In this embodiment, the reinforcing portion 31 is made of a CT steel, but the reinforcing portion 31 in the present invention is not limited to this, and may have any cross-sectional shape as long as it can reinforce the strength required for the main body portion 30 of the H-shaped steel. Although not shown, for example, the reinforcing portion may be made of an H-shaped steel. In such a case, the reinforcing beam 3 can be formed by fixing the lower flange of the main body portion 30 and the upper flange of the reinforcing portion made of the H-shaped steel with bolts and nuts. In addition, although not shown, for example, the reinforcing portion may be made of a channel steel or a lip channel steel. In such a case, the reinforcing portion is held so that the upper side is open, and both ends of the opening are welded to the lower surface of the lower flange of the main body portion 30, thereby forming the reinforcing beam 3. The reinforcing portion is adopted to have an appropriate cross-sectional shape in consideration of the strength required for the reinforcing beam 3 and interference with the surrounding members of the reinforcing beam 3.

[0033] Furthermore, if the reinforcing portion 31 is made of CT steel, when attaching a desired component such as an exterior material to the lower flange 33 of the main body portion 30, the flanges do not need to be overlapped on the lower flange 33 of the main body portion 30 as in the case of a reinforcing portion formed of, for example, H-shaped steel. Also, since the reinforcing portion 31 is open to the side, the desired component can be easily attached in the same manner as when attaching it to a typical H-shaped steel beam, without interference from the reinforcing portion 31.

[0034] The reinforcing beam 3 forms a main body protrusion 37 in which the end of the main body 30 protrudes longer in the longitudinal direction than the reinforcing part 31. In this embodiment, the main body protrusion 37 is formed at both ends of the main body 30. By forming the main body protrusion 37, the reinforcing part 31 is not formed at both ends of the reinforcing beam 3, and the lower surface of the main body protrusion 37 can abut against the upper end of the rigid frame column 4. The main body protrusion 37 is provided with a stiffener 38 between the upper and lower flanges 32, 33 above the position where it is joined to the rigid frame column 4, reinforcing the main body protrusion 37. When a vertical load is applied to the reinforcing beam 3 with supports at both ends, the amount of displacement is the largest at the center in the longitudinal direction of the reinforcing beam 3, which is the farthest from the supports, but the reinforcing part 31 is arranged at the center of the reinforcing beam 3 to reinforce the lower surface of the main body 30, and therefore, even if the main body protrusion 37 formed at the end of the reinforcing beam 3, which is the part close to the supports, is not reinforced by the reinforcing beam 3, it can be reinforced with sufficient strength.

[0035] The rigid frame column 4 includes a column body 40 made of H-shaped steel, a horizontal flat upper end plate 41 fixed to the upper end of the column body 40, and a flat base plate 42 fixed to the lower end of the column body 40. The base plate 42 is welded to the lower end of the column body 40 and fixed to an anchor bolt protruding from the foundation 6 with a double nut, thereby fixing the lower end of the rigid frame column 4 to the foundation 6. The base plate 42 is formed in a rectangular flat plate shape large enough to accommodate the entire lower end face of the H-shape of the column body 40. In this embodiment, the rigid frame column 4 is a column on the first floor of the building and erected on the foundation 6, but is not limited to this. For example, although not shown, if the rigid frame column 4 is a column on the second floor or higher, the base plate 42 of the rigid frame column 4 may be fixed to the upper flange of a beam erected in the ceiling space of the lower floor with a bolt and a nut.

[0036] The upper end plate 41 is a horizontal flat plate and is welded to the upper end of the column body 40. As shown in Figs. 3 and 4, the upper end plate 41 has two flat plate parts 43 fixed to the upper ends of the two flanges 46 of the column body 40 and extending horizontally, and a connecting part 44 that is formed along the upper end of the web 47 of the column body 40 so that the length in the width direction of the flange 46 of the column body 40 is narrower than the two flat plate parts 43 and connects the two flat plate parts 43. The upper end plate 41 is a steel plate material having a thickness of, for example, 20 mm. The two flat plate parts 43 of the upper end plate 41 are approximately square with rounded corners, and the length of one side of the square that constitutes the flat plate part 43 is, for example, 120 mm. The shape of the flat plate part 43 is not limited to a square, but it is preferable that the shape be such that it can be welded to the upper end of one flange 46 and web 47 of the column body 40 to be fixed horizontally, and that it can form two or more structural joint holes 45 described later. Each flat plate portion 43 is provided with four structural joint holes 45. The structural joint holes 45 are formed so as to be aligned with the bolt insertion holes 39 formed in the lower flange 33 when the upper end plate 41 is brought into contact with the lower flange 33 of the main body portion 30 of the reinforcing beam 3, and the joint bolts 7 are inserted into the structural joint holes 45 and the bolt insertion holes 39 to fasten the joint nuts 8, thereby rigidly joining the reinforcing beam 3 to the rigid frame column 4. The connecting portion 44 is formed, for example, with a length of 125 mm and a width of 25 mm, and connects the two flat plate portions 43. The connecting portion 44 is narrow enough to expose the exterior fixing holes 9 formed in the lower flange 33 without covering them when the upper end plate 41 is brought into contact with the lower surface of the lower flange 33 of the reinforcing beam 3.

[0037] Furthermore, the total length from one flat plate portion 43 of the upper end plate 41 to the other flat plate portion 43 is, for example, 375 mm, the length of the main body protruding portion 37 of the main body portion 30 of the reinforcing beam 3 is, for example, 402.5 mm, and when the upper end plate 41 is fixed to the underside of the main body protruding portion 37, a gap 22 of 28.5 mm is formed in the horizontal direction between the upper end plate 41 and the reinforcing portion 31. If the gap 22 is formed between the upper end plate 41 and the reinforcing portion 31, it becomes easier to perform the bolt connection between the upper end plate 41 and the main body portion 30 of the reinforcing beam 3, and also easier to wrap a fireproof covering material (not shown) around the reinforcing beam 3.

[0038] In the beam-column joint structure 1a of this embodiment, the entire upper surface of the upper end plate 41 of the rigid frame column 4 abuts against the underside of the main body protruding portion 37 of the reinforcing beam 3, and all four structural joint holes 45 formed in each of the two flat plate portions 43 are aligned with the bolt insertion holes 39 formed in the lower flange 33 of the main body protruding portion 37 of the reinforcing beam 3, and the upper end of the rigid frame column 4 and the reinforcing beam 3 are rigidly joined by the joining bolts 7 and joining nuts 8, respectively. In this way, the entire upper end plate 41 abuts against the underside of the main body protruding portion 37 of the reinforcing beam 3 and the two flat plate portions 43 are fixed by the joining bolts 7 and joining nuts 8, so that the end of the reinforcing beam 3 and the column capital of the rigid frame column 4 can be rigidly joined with sufficient strength.

[0039] In the beam-column joint structure 1a of this embodiment, the main body portion 30 at both ends of the reinforcing beam 3 protrudes beyond the reinforcing portion 31 to form the main body protrusion portion 37, and therefore the main body protrusion portion 37 at both ends of the reinforcing beam 3 is not reinforced by the reinforcing portion 31. The upper end plate 41 of the rigid frame column 4 is rigidly joined to the underside of the main body protrusion portion 37, which is the portion of the reinforcing beam 3 that is not reinforced by the reinforcing portion 31, so that the strength of the reinforcing beam 3 and the rigid frame column 4 are well balanced at the joint, and the occurrence of column collapse, which is disadvantageous from a structural standpoint, can be prevented.

[0040] In the beam-column joint structure 1a in this embodiment, the upper rigid frame column 5 is also fixed to the upper flange 32 of the main body protruding portion 37 of the main body 30 of the reinforcing beam 3 and stands upward from the main body protruding portion 37. The beam-column joint structure 1a is not limited to a configuration having such an upper rigid frame column 5.

[0041] In the beam frame structure 2a of this embodiment, the upper end plates 41 of each rigid frame column 4 are abutted and joined to the main body protrusions 37 formed at both ends of the reinforcing beam 3, thereby forming a rigid frame structure in which both ends of the reinforcing beam 3 are rigidly joined to the rigid frame columns 4. In this way, by providing the beam-column joint structure 1a of this embodiment at both ends of the reinforcing beam 3 and erecting the reinforcing beam 3 between the two rigid frame columns 4, both ends of the reinforcing beam 3 are made into a beam-supported, strong portal-type rigid frame structure, while the strength of the joint parts between the reinforcing beam 3 and the rigid frame columns 4 is well balanced, and a structure in which column collapse is unlikely to occur can be obtained. Moreover, since the beam-supported reinforcing beam 3 is rigidly joined directly to the rigid frame columns 4, the beam frame structure 2a of this embodiment can bear both horizontal and vertical forces, and since there is no need to install additional columns in the space under the beam between the two rigid frame columns 4, the space can be used efficiently.

[0042] Second Embodiment Hereinafter, a second embodiment of the beam-column joint structures 1a, 1b and a beam frame structure 2b including the beam-column joint structures 1a, 1b according to the present invention will be described with reference to Figures 5 to 8. Note that the same components as those in the beam-column joint structure 1a and the beam frame structure 2a in the first embodiment will be denoted by the same reference numerals and will not be described.

[0043] As shown in Fig. 5, the beam frame structure 2b in this embodiment is a gate-type rigid frame structure in which rigid frame columns 4 are erected on both ends of a reinforcing beam 3, and one end of the reinforcing beam 3 is joined to one rigid frame column 4 in the same configuration as in the first embodiment, while the other end of the reinforcing beam 3 is joined to the other rigid frame column 4 by a beam-column joint structure 1b of a second embodiment different from the first embodiment. Therefore, a description of the beam-column joint structure 1a similar to the first embodiment will be omitted, and only the beam-column joint structure 1b of the second embodiment shown at the left end of the reinforcing beam 3 in Fig. 5 will be described.

[0044] The beam-column joint structure 1b of the second embodiment joins a reinforcing beam 3 having a horizontally long main body 30 and a reinforcing part 31 fixed along the underside of the main body 30, and a rigid frame column 4 to which the end of the reinforcing beam 3 is joined and supports the end of the reinforcing beam 3. The shape of the main body 30 of the reinforcing beam 3 is the same as that of the first embodiment. The cross-sectional shape of the reinforcing part 31 of the reinforcing beam 3 is a CT-shaped steel having an inverted T-shaped cross section, as in the first embodiment, and the cross-sectional dimensions are also the same as in the first embodiment. The length of the reinforcing part 31 is formed to be shorter than the length of the main body 30, for example, by about 740 mm. In this embodiment, one end of the main body 30 protrudes about 400 mm longer than one end of the reinforcing part 31 to form a main body protrusion 37, and the other end of the main body 30 protrudes about 340 mm longer than the other end of the reinforcing part 31 to form a main body protrusion 37. As in the first embodiment, the reinforcing part 31 is not limited to a CT-shaped steel.

[0045] The rigid frame column 4 includes a column body 40 made of H-shaped steel, a horizontal flat upper end plate 41 fixed to the upper end of the column body 40, and a flat base plate 42 fixed to the lower end of the column body 40. The base plate 42 has the same configuration as in the first embodiment. The upper end plate 41 also has the same configuration as in the first embodiment and is formed to the same dimensions. The upper end plate 41 has two flat plate portions 43 fixed to the upper ends of the two flanges 46 of the column body 40 and extending in the horizontal direction, and a connecting portion 44 formed along the upper end of the web 47 of the column body 40 with a width narrower than the two flat plate portions 43 and connecting the two flat plate portions 43.

[0046] At one end of the reinforcing beam 3, a main body protrusion 37 is formed, so that, as in the first embodiment, the entire upper surface of the upper end plate 41 of the rigid frame column 4 abuts against the underside of the main body protrusion 37 of the reinforcing beam 3, and all four structural connection holes 45 formed in each of the two flat plate portions 43 are aligned with the bolt insertion holes 39 formed in the lower flange 33 of the main body protrusion 37 of the reinforcing beam 3, and the upper end of the rigid frame column 4 and the reinforcing beam 3 are rigidly connected by the connection bolts 7 and connection nuts 8, respectively. This configuration is the same as in the first embodiment, and is therefore the configuration shown in Figs. 2 to 4.

[0047] 6 to 8, at the other end of the reinforcing beam 3, the lower surface of the main body protruding portion 37 of the reinforcing beam 3 abuts against one flat plate portion 43 of the upper end plate 41, four structural joint holes 45 formed in the one flat plate portion 43 are aligned with bolt insertion holes 39 formed in the lower flange 33 of the main body protruding portion 37, and the upper end of the rigid frame column 4 and the reinforcing beam 3 are rigidly joined by the joint bolts 7 and joint nuts 8. Then, on the other flat plate portion 43, an H-shaped steel beam 13 erected in a direction perpendicular to the reinforcing beam 3 is placed on the other flat plate portion 43 of the upper end plate 41, and the lower flange of the beam 13 and the other flat plate portion 43 of the upper end plate 41 are joined by bolts.

[0048] A plurality of through holes 11 into which the beam connection bolts 10 can be inserted are provided in the web 35 of the main body protruding portion 37 at the other end of the reinforcing beam 3, and a stiffener 12 is provided between the upper and lower flanges of the H-shaped steel beam 13 erected in a direction perpendicular to the reinforcing beam 3 and flush with the web 35 of the main body protruding portion 37, and the stiffener 12 also has a through hole 11 formed therein. A flat beam connection plate 14 is disposed across the web 35 of the main body protruding portion 37 and the stiffener 12 of the H-shaped steel beam 13. The beam connection plate 14 has connection holes 15 formed at positions aligned with the through holes 11 formed in the web 35 and the stiffener 12. The main body protruding portion 37 and the H-shaped steel beam 13 are connected to each other by inserting the beam connection bolts 10 into the connection holes 15 and the through holes 11 and fastening nuts (not shown).

[0049] The reinforcing beam 3 is rigidly connected by abutting the lower surface of the main body protruding portion 37 against one flat plate portion 43 of the upper end plate 41 and bolting it, and the H-shaped steel beam 13 erected in a direction perpendicular to the reinforcing beam 3 is bolted to the other flat plate portion 43 of the upper end plate 41, so that the rigid frame column 4 can also bear the load of the perpendicular beam 13. Therefore, since there is no need to provide a separate column, the effective space under the beam can be expanded, and the beam 13 perpendicular to the reinforcing beam 3 can be arranged as necessary. For example, when a cantilevered eaves is protruding in a direction perpendicular to the reinforcing beam 3, the perpendicular beam 13 can be used as a beam supporting the eaves, and the degree of freedom of design can be increased. In FIG. 8, the beam 13 does not protrude in the lower right direction of the drawing for convenience of illustration, but the beam 13 may protrude on both sides from the position supported by the rigid frame column 4.

[0050] In addition, even in the beam-to-column joint structure 1b of the second embodiment, the main body portion 30 at both ends of the reinforcing beam 3 protrudes beyond the reinforcing portion 31 to form a main body protrusion 37, and is not reinforced by the reinforcing portion 31, and the upper end plate 41 of the rigid frame column 4 is rigidly joined to the underside of the main body protrusion 37. As a result, the strength of the reinforcing beam 3 and the rigid frame column 4 are well balanced at the joint, and column collapse, which would be disadvantageous from a structural standpoint, can be prevented.

[0051] Furthermore, in the beam frame structure 2b of the second embodiment, the upper end plates 41 of each rigid frame column 4 abut and are joined to the main body protrusions 37 formed on both ends of the reinforcing beam 3, so that both ends of the reinforcing beam 3 can be made into a strong portal-type rigid frame structure with beams as the main beams, while the structure is less susceptible to column collapse. Furthermore, since there is no need to install additional column material in the space under the beams between the two rigid frame columns 4, the space can be utilized efficiently.

[0052] In the beam frame structure 2b of this embodiment, one end of the reinforcing beam 3 and one of the rigid frame columns 4 are joined in a configuration similar to that of the first embodiment, and the other end of the reinforcing beam 3 and the other rigid frame column 4 are joined by the beam-to-column joint structure 1b of the second embodiment which is different from the first embodiment. However, both ends of the reinforcing beam 3 may also be joined by the beam-to-column joint structure 1b of the second embodiment.

[0053] Third embodiment Hereinafter, a third embodiment of the beam-to-column joint structures 1a, 1b and beam frame structures 2a, 2b, 2c including the beam-to-column joint structures 1a, 1b according to the present invention will be described with reference to Figures 9 and 10. Note that the same components as those in the beam-to-column joint structures 1a, 1b and the beam frame structures 2a, 2b in the first and second embodiments will be denoted by the same reference numerals and will not be described.

[0054] 9, in the beam frame structure 2c in the third embodiment, a rigid frame column 4 is erected at one end of a reinforcing beam 3, the other end of the reinforcing beam 3 is cantilevered, and a support column 16, which is not a rigid frame column 4, is erected between one end and the other end of the reinforcing beam 3 to support the vertical load of the reinforcing beam 3. Although not shown, a beam erected in a direction perpendicular to the reinforcing beam 3 may be fixed to the side of the reinforcing beam 3 to support the horizontal load applied to the reinforcing beam 3. One end of the reinforcing beam 3 and the rigid frame column 4 are joined in the same manner as in the first embodiment, so a detailed description of the joining structure on one end side of the reinforcing beam 3 will be omitted.

[0055] 10, the support column 16 is a steel square column 17, the lower end of which is fixed to an anchor bolt of the foundation 6, the upper end of which is formed with a cylindrical upper protrusion 18, and a rectangular flat beam connection plate 19 is formed at the upper end of the upper protrusion 18. The beam connection plate 19 abuts against a flange 36 formed on the lower side of the reinforcing part 31 of the reinforcing beam 3, and is connected with a fixing bolt 20 and a fixing nut 21.

[0056] According to the beam frame structure 2c in the third embodiment, one end of the reinforcing beam 3 is joined with a beam-to-column joint structure 1a similar to that in the first embodiment, so that one end of the reinforcing beam 3 is fixed to the rigid frame column 4 via the beam while the structure supporting the other end of the reinforcing beam 3 can be freely designed, thereby increasing the design freedom of the space adjacent to the beam frame structure 2c.

[0057] The configuration of the other end of the reinforcing beam 3 in the beam frame structure 2c is not limited to the above. Also, the joint structure of one end of the reinforcing beam 3 in the beam frame structure 2c is not limited to the joint structure 1a between a beam and a column similar to that in the first embodiment, but may be the joint structure 1b between a beam and a column similar to that in the second embodiment.

[0058] It goes without saying that the embodiment of the present invention is not limited to the above-mentioned embodiment, and can be modified as appropriate without departing from the scope of the concept of the present invention.

[0059] <First Invention> The first invention of the present application is a beam-column joint structure comprising a reinforcing beam having a horizontally long main body portion and a reinforcing portion fixed along the underside of the main body portion, and a rigid frame column having an upper end to which an end of the reinforcing beam is joined and supporting the end of the reinforcing beam, wherein the end of the reinforcing beam is formed with a main body protrusion portion in which the main body portion protrudes longer in the longitudinal direction than the reinforcing portion, and the upper end of the rigid frame column is rigidly joined by abutting the underside of the main body protrusion portion.

[0060] According to this, the reinforcing beam has a main body protruding part at its end, which protrudes longer in the longitudinal direction than the reinforcing part, so that the main body protruding part is not reinforced by the reinforcing part, and the upper end of the rigid frame column is abutted against the underside of the main body protruding part, which is the unreinforced part, and is rigidly connected to it, so that it is possible to achieve a rigid frame structure with reinforced beams, but with columns that are less likely to collapse. Also, because the main body protruding part is rigidly connected directly to the rigid frame column, the rigid frame column can withstand both the horizontal force and the vertical load of the reinforcing beam, and there is no need to install a separate column that only bears the load of the reinforcing beam. Therefore, compared to the case where a separate column is provided from the rigid frame column, it is possible to increase the effective size of the space under the beam and reduce costs.

[0061] <Second Invention> The second invention of the present application is a beam-column joint structure of the first invention, wherein the main body portion is an H-shaped steel having flanges formed on the top and bottom, and the reinforcing portion is a CT steel having a web arranged upward and a flange formed on the bottom.

[0062] According to this, in addition to the effects of the first invention, the main body is an H-shaped steel, and the reinforcing part is a CT-shaped steel with a web facing upward and a flange formed on the lower side, so the reinforcing part is open toward the side. Since the main body is an H-shaped steel like a general beam, a desired part to be attached to a beam, such as an exterior material, can be attached with the same fitting and the same joining material as when it is attached to a general beam, and there is no need to design a new part to attach the part, so that an increase in costs can be suppressed. In particular, when attaching a desired part to the lower flange of the main body, since the reinforcing part is a CT steel, the flange of the reinforcing part is not placed overlapping the flange of the main body, and since the reinforcing part is open toward the side, the desired part can be easily attached in the conventional fitting without interference from the reinforcing part.

[0063] <Third Invention> The third invention of the present application is a beam-column joint structure of the first or second invention, wherein the rigid frame column comprises an H-shaped steel column body and a horizontal flat upper end plate fixed to the upper end of the column body.

[0064] According to this, in addition to the effects of the first or second invention, the rigid frame column comprises an H-shaped steel column body and a horizontal flat upper end plate fixed to the upper end of the column body, so that the upper end plate can be easily attached by abutting against the underside of the lower flange of the main body of the reinforcing beam.

[0065] <Fourth Invention> The fourth invention of the present application is a joint structure between a beam and a column according to any one of the first to third inventions, wherein the upper end plate has two flat plate sections fixed to the upper ends of the two flanges of the column body, respectively, and extending horizontally, and a connection section along the upper end of the web of the column body, the connection section being formed so that the length in the flange width direction of the column body is narrower than the two flat plate sections and connects the two flat plate sections, and the flat plate section is flat and has structural joint holes formed therein for inserting bolts that are joined to the lower flange of the main body of the reinforcing beam, and when the upper end plate is joined to the lower flange of the main body, exterior fixing holes formed in the lower flange of the main body part on the side of the connection section and for fixing exterior members of a building are exposed.

[0066] According to this, in addition to the effects of the first to third inventions, the upper end plate of the rigid frame column has two flat plate sections that are fixed respectively to the upper ends of the two flanges of the column body and extend horizontally, and a connection section that is formed narrower than the two flat plate sections along the upper end of the web of the column body and connects the two flat plate sections, and a structural joining hole for joining the reinforcing beam to the rigid frame column is formed in the flat plate section, and because the connection section is narrow, the lower flange of the main body section of the reinforcing beam is exposed on the side of the connection section, and the exterior fixing hole formed in the lower flange is exposed, so that the exterior member can be attached to the main body section of the reinforcing column without interfering with the upper end plate.

[0067] <Fifth Invention> A fifth invention of the present application relates to a beam-column joint structure according to any one of the first to fourth inventions, in which the upper end plate and the reinforcing portion are disposed with a gap therebetween.

[0068] According to this, in addition to the effects of any of the first to fourth inventions, the upper end plate and the reinforcing portion are arranged with a gap between them, which makes it easier to perform the bolt connection work between the upper end plate and the main body of the reinforcing beam, and the gap makes it easier to wrap fire-resistant covering material around the reinforcing beam.

[0069] <Sixth Invention> The sixth invention of the present application is a joint structure between a beam and a column of any of the first to fifth inventions, wherein the reinforcing beam is bolted to the two flat plate portions with the lower surface of the main body protrusion abutting the entire upper surface of the upper end plate.

[0070] According to this, in addition to the effects of any of the first to fifth inventions, the reinforcing beam is bolted to the two flat plate portions with the lower surface of the main body protrusion abutting the entire upper surface of the upper end plate, so that the end of the reinforcing beam and the capital of the rigid frame column can be rigidly joined with sufficient strength, and the rigid frame column can fully withstand the vertical load and horizontal strength of the reinforcing beam.

[0071] <Seventh Invention> The seventh invention of the present application is a joint structure between a beam and a column of any of the first to fifth inventions, wherein the underside of the main body protrusion of the reinforcing beam abuts against one flat portion of the upper end plate and is bolted to the upper end plate, and a beam erected in a direction perpendicular to the reinforcing beam is bolted to the other flat portion of the upper end plate.

[0072] According to this, in addition to the effects of any one of the first to fifth inventions, the reinforcing beam is rigidly connected by abutting the underside of the main body protruding part against one flat part of the upper end plate and bolting it, and the beam erected in a direction perpendicular to the reinforcing beam is bolted to the other flat part of the upper end plate, so the load of the perpendicular beam can also be supported by the rigid frame column, and since there is no need to provide a separate column, the effective space under the beam can be expanded. Also, since a beam perpendicular to the reinforcing beam can be arranged as necessary, the degree of freedom in design can be increased, for example, when a cantilever eaves is protruding in a direction perpendicular to the reinforcing beam.

[0073] <Eighth Invention> The eighth invention (first embodiment, second embodiment) of the present application is a beam frame structure, wherein the reinforcing beam has both ends of the main body portion that protrude further in the longitudinal direction than the reinforcing portion to form the main body protrusion portion, and the rigid frame columns are erected at both ends of the reinforcing beam, and any one of the beam-to-column joint structures described above from the first to seventh embodiments is provided at each end of the reinforcing beam, and the reinforcing beam is erected between the two rigid frame columns.

[0074] According to this, a beam-column joint structure of any one of the above 1 to 7 types is provided at both ends of the reinforcing beam, and the reinforcing beam is erected between two rigid frame columns. Therefore, both ends of the reinforcing beam can be made into a strong portal-type rigid frame structure with a beam-supported structure, while the structure is less susceptible to column collapse. Since the reinforcing beam with a beam-supported structure is rigidly joined directly to the rigid frame columns, there is no need to install a column separate from the rigid frame columns, and the space under the beam between the two rigid frame columns can be utilized to the maximum extent possible.

[0075] <Ninth Invention> The ninth invention (third embodiment) of the present application is a beam frame structure, in which at least one end of the main body portion of the reinforcing beam protrudes longer in the longitudinal direction than the reinforcing portion to form the main body protrusion, the rigid frame column is erected on at least one end of the reinforcing beam, and a beam-column joint structure as described above for any one of the first to seventh aspects is provided at one end of the reinforcing beam.

[0076] According to this, since one end of the reinforcing beam is provided with any one of the beam-column joint structures 1 to 7 described above, it is possible to fix one end of the reinforcing beam to the rigid frame column with the beam at its end, while creating a structure in which column collapse is less likely to occur, and the structure supporting the other end of the reinforcing beam can be freely designed, thereby increasing the design freedom of the space adjacent to the beam frame structure. [Industrial Applicability]

[0077] The beam-column joint structure and beam frame structure of the present invention are suitable as the structural frame of a heavy steel frame rigid frame building. [Explanation of symbols]

[0078] 1a, 1b Beam-column joint structure 2a,2b,2c beam frame structure 3 Reinforcement beam 4. Ramen Pillar 9 Exterior fixing hole 30 Main body 31 Reinforcement 37 Body protrusion 40 Pillar body 41 Top plate 43 Flat plate part 44 Connection 45 Structural bonding hole

Claims

1. A reinforcing beam having a horizontally long main body and a reinforcing portion fixed along a lower surface of the main body, and a rigid frame column having an upper end to which an end of the reinforcing beam is joined and supporting the end of the reinforcing beam, The end of the reinforcing beam is formed with a main body protruding portion in which the main body protrudes longer in the longitudinal direction than the reinforcing portion, The upper end of the rigid frame column abuts against the underside of the main body protrusion and is rigidly joined to the beam and column.

2. The main body is an H-shaped steel having flanges formed on the top and bottom, 2. The beam-column joint structure according to claim 1, wherein the reinforcing portion is a CT section steel having a web facing upward and a flange formed on the lower side.

3. 3. The beam-column joint structure according to claim 2, wherein the rigid frame column comprises a column body made of H-shaped steel and a horizontal flat upper end plate fixed to the upper end of the column body.

4. The upper end plate has two flat plate portions fixed to the upper ends of the two flanges of the column body, respectively, and extending horizontally, and a connecting portion that is formed along the upper end of the web of the column body so that the length in the flange width direction of the column body is narrower than the two flat plate portions and connects the two flat plate portions; The flat plate portion is flat and has a structural joining hole for inserting a bolt to be joined to the lower flange of the main body portion of the reinforcing beam, 4. A beam-column joint structure as described in claim 3, wherein when the upper end plate is joined to the lower flange of the main body portion, an exterior fixing hole formed in the lower flange of the main body portion on the side of the connection portion and used to fix an exterior component of a building is exposed.

5. The beam-column joint structure according to claim 3 , wherein the upper end plate and the reinforcing portion are disposed with a gap between them.

6. 5. The beam-column joint structure according to claim 4, wherein the reinforcing beam is bolted to the two flat plate portions with the lower surface of the main body protrusion abutting the entire upper surface of the upper end plate.

7. The reinforcing beam is connected by a bolt such that a lower surface of the main body protruding portion abuts against one flat plate portion of the upper end plate, 5. A beam-column joint structure according to claim 4, wherein a beam installed in a direction perpendicular to the reinforcing beam is connected to the other flat portion of the upper end plate with bolts.

8. The reinforcing beam has both ends of the main body portion protruding longer in a longitudinal direction than the reinforcing portion to form the main body protruding portion, The rigid frame columns are erected at both ends of the reinforcing beam, The beam-column joint structure according to any one of claims 1 to 7 is provided at both ends of the reinforcing beam, A beam frame structure in which the reinforcing beam is erected between the two rigid frame columns.

9. The reinforcing beam has at least one end of the main body portion protruding longer in a longitudinal direction than the reinforcing portion to form the main body protruding portion, The rigid frame column is erected on at least one end of the reinforcing beam, A beam frame structure, comprising the beam-column joint structure according to any one of claims 1 to 7, provided at one end of the reinforcing beam.

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