Structure of steel joint between column and beam in two-way wooden rigid frame structure

Abstract

To provide a steel joint between a column and a beam in a two-way wooden rigid frame structure, which has high rigidity and high strength and can realize a tenacious frame even after the steel joint is deformed.SOLUTION: A steel joint 13 includes a joint 14 made of a square steel pipe, an upper column-side diaphragm 15 provided at the top of the joint, a lower column-side diaphragm 16 provided at the bottom of the joint, a column-side bracket 17 provided on two sides of the joint, a beam-side bracket 20 rigidly connected to the column-side bracket, and a beam-side flange 21 connected to the beam-side bracket and joined to the end of the beam, with a steel rod 22a inserted through the upper column-side diaphragm and fastened to the lower end of an upper column 11a, a steel rod 22b inserted through the lower column-side diaphragm and fastened to the upper end of a lower column 11b, and a steel rod 22c inserted through the beam-side flange and fastened to an end 12a of a beam 12.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to the structure of a steel joint between a column and a beam in a two-way wooden rigid frame structure. [Background technology]

[0002] There are two known methods for joining beams and columns in conventional wooden rigid-frame structures: (a) a steel plate insertion joining method in which the end of a wooden beam is butted against the side of a wooden column from one or two directions, a steel plate is inserted into a slit in the wood, and the steel plate is secured in place with a drift pin; and (b) an adhesive unbonded anchor joining method or adhesive bonded anchor joining method in which holes are drilled on the joining surfaces of the wood, and steel rods are inserted into the holes and secured with adhesive (the applicant calls these methods GIUA (glue in unbonded anchor) or GIR (glue in Rod)).

[0003] On the other hand, as a method of joining columns and beams in a wooden rigid frame structure, a joining method has been disclosed in which a steel joint member is interposed at the joint between the column and the beam, and anchor bolts and adhesive are used in combination (see Patent Document 1). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent Publication No. 2021-188326 Summary of the Invention [Problem to be solved by the invention]

[0005] In the conventional examples (a) and (b), a loss of cross section occurs in the column joint, which is subjected to the greatest bending stress, and the joint yields before the column and beam. Therefore, in order to increase the bending rigidity of the column joint, it is necessary to increase the column cross section, which causes design and manufacturing constraints, as well as construction problems, leading to increased costs. On the other hand, the disclosed method of joining columns and beams is for a one-way rigid frame structure, and to apply it to a two-way rigid frame structure, a steel joint member that can resist stress from two directions is required.

[0006] Additionally, because the corner columns of a building generally have a large pull-out force, in reinforced concrete structures, through tie rods that are fixed to the foundation are installed inside the columns, and in steel-framed structures, tension material that resists pull-out is installed around the columns on the lower floors. However, attaching pull-out resistant material to the joints of wooden structures is difficult as the joining method becomes complicated.

[0007] Therefore, in the frame of a wooden two-way rigid frame structure, there is a challenge to solve the above-mentioned problems when wooden columns and beams are rigidly joined in two directions and when pull-out resistance materials are incorporated into the corner columns. [Means for solving the problem]

[0008] The gist of the present invention, which solves the problems of the conventional examples, is the structure of a steel joint between a column and a beam in a two-way wooden rigid frame structure, the steel joint comprising at least a joint made of a square steel pipe or a box steel plate formed by welding four steel plates together into a hollow square column, an upper column-side diaphragm provided at the top of the joint, a lower column-side diaphragm provided at the bottom of the joint, column-side brackets provided on two sides of the joint, a beam-side bracket rigidly connected to the column-side bracket, and a beam-side flange connected to the beam-side bracket and joined to the end of the beam, and is configured so that a steel rod is inserted through the upper column-side diaphragm and fastened to the lower end of the upper column, a steel rod is inserted through the lower column-side diaphragm and fastened to the upper end of the lower column, and a steel rod is inserted through the beam-side flange and fastened to the end of the beam.

[0009] Furthermore, a long pull-out resistance material is connected to each of the upper column side diaphragm and the lower column side diaphragm via a gusset plate, and the pull-out resistance material is arranged along the longitudinal direction of the side surfaces of the upper column and the lower column; Two upper and lower through diaphragms connected by a vertical steel plate are disposed between the upper column side diaphragm and the lower column side diaphragm, and long pull-out resistance materials are connected to each of the through diaphragms, and the pull-out resistance materials are disposed along the column through holes of the upper column and the lower column; Joining the lower end of the pull-out resistance material arranged along the lower column or along the column through-hole to a column base metal fitting provided on the foundation; It includes: [Effects of the Invention]

[0010] The steel joint between a column and a beam in a two-way wooden frame structure according to the present invention comprises a joint made of a square steel pipe or a box steel plate formed by welding four steel plates into a hollow square column, an upper column diaphragm attached to the top of the joint, a lower column diaphragm attached to the bottom of the joint, column brackets attached to two sides of the joint, a beam bracket rigidly joined to the column bracket, and a beam flange connected to the beam bracket. A steel rod is inserted through the upper column diaphragm and fastened to the lower end of the upper column, a steel rod is inserted through the lower column diaphragm and fastened to the upper end of the lower column, and a steel rod is inserted through the beam flange and fastened to the end of the beam. This configuration makes the steel joint rigid, and the unbonded parts of the steel rods in the column and beam deform to absorb deformation energy during earthquakes, etc., thereby minimizing damage to the wood even during large deformations, resulting in a joint with high rigidity, strength, and toughness. During construction, steel rods are inserted into the beam flanges and fastened to the ends of the beams at the factory, and then the column brackets and beam brackets are rigidly joined at the site using splice plates and high-strength bolts, allowing for efficient assembly. Furthermore, the central portion of the web between the column-side bracket and the beam-side bracket is less affected by stress transmitted from the beam, so it is possible to provide a sleeve for equipment piping. This provides a variety of excellent effects.

[0011] By connecting long pull-out resistance materials to the upper column side diaphragm and the lower column side diaphragm via gusset plates, arranging the pull-out resistance materials along the longitudinal direction of the sides of the upper column and lower column, and joining the lower ends of the pull-out resistance materials arranged along the lower column to column base hardware installed in the foundation, it is possible to attach the pull-out resistance material to the joint even in wooden construction, and the pull-out force is transmitted from the upper floor to the foundation, thereby achieving the excellent effect of reinforcing the pull-out resistance of the steel joint.

[0012] Two upper and lower through diaphragms connected by a vertical steel plate are arranged between the upper column side diaphragm and the lower column side diaphragm, long pull-out resistance material is connected to each of the through diaphragms, the pull-out resistance material is arranged along the column through holes of the upper column and lower column, and the lower end of the pull-out resistance material arranged along the column through hole of the lower column is joined to a column base metal fitting installed in the foundation, thereby achieving the excellent effect of allowing the pull-out resistance material to be attached to the joint even in wooden construction, and the pull-out force is transmitted from the upper floor to the foundation, thereby reinforcing the pull-out strength of the steel joint. [Brief explanation of the drawings]

[0013] [Figure 1] 1 is a perspective view showing a steel joint between a column and a beam according to a first embodiment of the present invention. [Figure 2] 1 is a perspective view showing a part of a steel joint between a column and a beam according to a first embodiment of the present invention, in which the part is separated. [Figure 3] 5 is a longitudinal cross-sectional view (cross-sectional view taken along line A in FIGS. 4 and 5) of a steel joint between a column and a beam according to a first embodiment of the present invention. [Figure 4] FIG. 4 is a cross-sectional view taken along line B in FIG. 3. [Figure 5] FIG. 4 is a cross-sectional view taken along line C in FIG. 3. [Figure 6] FIG. 10 is a perspective view showing a steel joint between a column and a beam according to a second embodiment of the present invention. [Figure 7] 8 is a longitudinal cross-sectional view (cross-sectional view taken along line D in FIG. 8) of a steel joint between a column and a beam according to a second embodiment of the present invention. [Figure 8]FIG. 8 is a cross-sectional view taken along line E in FIG. 7. [Figure 9] FIG. 8 is a cross-sectional view taken along line F in FIG. 7. [Figure 10] FIG. 2 is a front view showing a flat plate pull-out resistance material. [Figure 11] This is a vertical cross-sectional view (cross-sectional view along line I in Figure 13) of the vicinity of the column base hardware installed on the foundation. [Figure 12] FIG. 12 is a cross-sectional view taken along line G in FIG. [Figure 13] FIG. 12 is a cross-sectional view taken along line H in FIG. [Figure 14] FIG. 10 is a perspective view showing a steel joint between a column and a beam according to a third embodiment of the present invention. [Figure 15] 16 is a longitudinal cross-sectional view (cross-sectional view taken along line L in FIG. 16 and FIG. 17) of a steel joint between a column and a beam according to a third embodiment of the present invention. [Figure 16] FIG. 16 is a cross-sectional view taken along line J in FIG. 15. [Figure 17] FIG. 16 is a cross-sectional view taken along line K in FIG. 15. [Figure 18] This is a vertical cross-sectional view of the vicinity of the column base hardware installed in the foundation (cross-sectional view along line O in Figures 19 and 20). [Figure 19] FIG. 19 is a cross-sectional view taken along line M in FIG. 18. [Figure 20] 19 is a cross-sectional view taken along line N in FIG. 18. [Figure 21-1] FIG. 10 is a perspective view showing a steel joint between a column and a beam according to a fourth embodiment of the present invention. [Figure 21-2] FIG. 10 is a perspective view showing a joint portion made up of a box steel plate and a cross-shaped reinforcing steel plate member in isolation. [Figure 22] 23 is a longitudinal cross-sectional view (cross-sectional view taken along line R in FIGS. 23 and 24) of a steel joint between a column and a beam according to a fourth embodiment of the present invention. FIG. [Figure 23] 23 is a cross-sectional view taken along line P in FIG. 22. [Figure 24] 23 is a cross-sectional view taken along line Q in FIG. 22. [Figure 25] This is a vertical cross-sectional view of the vicinity of the column base hardware installed in the foundation (cross-sectional view along line U in Figures 26 and 27). [Figure 26] FIG. 26 is a cross-sectional view taken along line S in FIG. 25. [Figure 27] FIG. 26 is a cross-sectional view taken along line T in FIG. 25. DETAILED DESCRIPTION OF THE INVENTION

[0014] The structure of the steel joint between the column and beam in the wooden two-way rigid frame structure of the present invention comprises a joint made of a square steel pipe or a box steel plate formed by welding four steel plates into a hollow square pillar shape, an upper column-side diaphragm provided at the top of the joint, a lower column-side diaphragm provided at the bottom of the joint, column-side brackets provided on two sides of the joint, a beam-side bracket rigidly connected to the column-side bracket, and a beam-side flange connected to the beam-side bracket and joined to the end of the beam, with a steel rod inserted through the upper column-side diaphragm and fastened to the lower end of the upper column, a steel rod inserted through the lower column-side diaphragm and fastened to the upper end of the lower column, and a steel rod inserted through the beam-side flange and fastened to the end of the beam, so that bending and shear forces acting on the column and beam in response to inter-story deformation during an earthquake, etc., are transmitted to the steel joint. Therefore, it is possible to maximize the strength of the wooden columns and beams, while achieving a highly rigid and strong frame that remains resilient even after the joints have been deformed. [Example]

[0015] A first embodiment of the present invention will be described with reference to the drawings. Figures 1 and 2 are perspective views showing a steel joint 13 between a column 11 and a beam 12, and the interior of the column 11 and the beam 12 are clearly shown for ease of understanding.

[0016] As shown in Figures 1 and 2, the present invention relates to the structure of a steel joint 13 between a column 11 and a beam 12 in a wooden two-way rigid frame structure, and the steel joint 13 comprises a joint 14 made of a square steel pipe, an upper column-side diaphragm 15 welded to the upper part of the joint 14, a lower column-side diaphragm 16 welded to the lower part of the joint 14, a column-side bracket 17 provided on two sides of the joint 14, a beam-side bracket 20 rigidly joined to the column-side bracket 17, and a beam-side flange 21 connected to the beam-side bracket 20 and joined to the end 12a of the beam 12. The structure is such that a steel rod 22a is inserted through the upper column side diaphragm 15 and secured to the lower end of the upper column 11a, a steel rod 22b is inserted through the lower column side diaphragm 16 and secured to the upper end of the lower column 11b, and a steel rod 22c is inserted through the beam side flange 21 and secured to the end 12a of the beam 12.

[0017] As shown in Figures 1 to 5, the joint section 14 is made of steel and consists of a hollow square steel pipe, and is formed into a box shape of the required height, with an upper column side diaphragm 15 formed at the top of the joint section 14 and a lower column side diaphragm 16 formed at the bottom, each integrally formed by means of welding or the like.

[0018] As shown in FIGS. 1 and 5, the upper column-side diaphragm 15 and the lower column-side diaphragm 16 are flat steel plates. The upper column-side diaphragm 15 is provided at the top of the joint 14, and is provided to extend outward by a required width along the outside of the four sides of the joint 14 (see Figures 1 to 3). The lower column-side diaphragm 16 is provided at the lower part of the joint 14, and is provided to extend outward by a required width along the outside of the four sides of the joint 14 (see Figures 1 to 3).

[0019] As shown in Figures 1 to 3, the upper column side diaphragm 15 is joined to the lower end of the upper column 11a, and multiple steel rods 22a are inserted along the periphery of the upper column side diaphragm 15 and tightened to the lower end of the upper column 11a with high-strength bolts 19. That is, as shown in FIGS. 1 to 3, the upper column side diaphragm 15 is formed in approximately the same shape as the lower end of the upper column 11a, and a steel rod 22a is inserted from the underside of the upper column side diaphragm 15. Similarly, the lower column side diaphragm 16 is joined to the upper end of the lower column 11b, and multiple steel rods 22b are inserted along the periphery of the lower column side diaphragm 16 and fastened to the upper end of the lower column 11b with high-strength bolts 19. That is, as shown in Figures 1 to 3 and 5, the lower column side diaphragm 16 is formed in approximately the same shape as the upper end of the lower column 11b, and a steel rod 22b is inserted from the upper side of the lower column side diaphragm 16. 3 to 5, reference numeral 23 denotes a stiffener for reinforcement provided across the upper column side diaphragm 15 and the lower column side diaphragm 16.

[0020] The steel rods 22a, 22b, and 22c referred to in the present invention include not only steel rods but also lag screw bolts and tension bolts, and also include adhesive unbonded anchor joints and adhesive bonded anchor joints in which steel rods are inserted and restrained with adhesive, as explained in the Background Art section. 1 to 4 indicate a shear key, and the shear key 31 mainly contributes to the shear force.

[0021] As shown in FIGS. 1 and 2, the column-side brackets 17 are provided on the two side portions of the joint portion 14. The column side bracket 17 consists of a steel web 24 that is installed vertically between the upper column side diaphragm 15 and the lower column side diaphragm 16, and horizontal steel plates 25 that are installed at four or more locations on the web 24 at specified intervals. The upper column-side diaphragm 15 is either extended or welded to the upper horizontal steel plate 25a, which is integrally formed (see Fig. 3). The lower column-side diaphragm 16 is either extended or welded to the lower horizontal steel plate 25b, which is integrally formed (see Figs. 3 and 5). 3 and 4, reference numeral 37 denotes an inner diaphragm.

[0022] As shown in Figure 3, the beam side bracket 20 consists of a steel web 26 that is installed vertically from the upper end to the lower end of the beam side flange 21, and horizontal steel plates 27 that are installed on the beam side flange 21 and at four or more locations on the web 26 at predetermined intervals. As shown in Figure 3, the beam side flange 21 is formed in a plate shape approximately the same as the end 12a of the beam 12, and is joined to the end 12a of the beam 12, and is fastened to the end 12a of the beam 12 by inserting a steel rod 22c through it and tightening it to the end 12a of the beam 12 with a high-strength bolt 19.

[0023] As shown in FIGS. 1 to 5, the column-side bracket 17 and the beam-side bracket 20 are rigidly joined at multiple locations with high-strength bolts 19 via splice plates 18 .

[0024] 1 to 3, reference numeral 30 denotes a sleeve for equipment piping provided on the web 24 and the web 26. The web 24 of the column-side bracket 17 and the central portion of the beam-side bracket 20 and web 26 are less affected by stress transmitted from the beam 12, so it is possible to form the sleeve 30 for equipment piping.

[0025] According to the structure of the steel joints between the columns and beams in a two-way wooden rigid frame structure configured as described above, the bending and shear forces acting on the columns 11 and beams 12 in response to inter-story deformation during an earthquake or other events are transmitted to the steel joints 13. As a result, the strength of the wooden columns 11 and beams 12 can be maximized, and a highly rigid, high-strength frame can be realized that remains resilient even after the joints have become plastic. [Example]

[0026] Next, we will explain the structure of the steel joint between the column and the beam in a two-way wooden rigid frame structure according to a second embodiment of the present invention. In this second embodiment, the same parts as those in the first embodiment are designated by the same reference numerals, and details thereof will be omitted. FIG. 6 is a perspective view showing a steel joint 13 between a column 11 and a beam 12, and clearly shows the inside of the column 11 and the beam 12 for ease of understanding.

[0027] In wooden buildings, corner columns have a large pull-out force, and when compressed, they resist the axial force using only the column base material. However, when tension is applied, the pull-out resistance applied to the part where the steel rods 21a and 21b at the end of the column are inserted can be reinforced by fastening the steel joint 13 at the column head to the column base hardware 32 at the column base with pull-out resistance material 33 (see Figure 6).

[0028] To explain in detail how the pull-out resistance material 33 is disposed, as shown in Fig. 7, a gusset plate 34 is welded to the horizontal steel plate 25a (upper column-side diaphragm 15) of the column-side bracket 17, and the long pull-out resistance material 33 is fastened to the gusset plate 34 via a splice plate 35 and a bolt 36. Then, the pull-out resistance material 33 is disposed along the longitudinal direction of the side surface of the column 11a (see Fig. 6). 7, a gusset plate 34 is welded to the horizontal steel plate 25b (lower column-side diaphragm 16) of the column-side bracket 17, and a long pull-out resistance material 33 is fastened to the gusset plate 34 via a splice plate 35 and a bolt 36. Then, the pull-out resistance material 33 is arranged along the longitudinal direction of the side surface of the column 11b (see FIG. 6). Furthermore, the lower end 33a of the pull-out resistance material 33 is fastened to the rib plate 40 of the column base metal fitting 32 provided on the foundation via a splice plate 35 and a bolt 36 (see FIG. 11). In addition, reference numeral 37 in FIGS. 7 and 9 denotes an inner diaphragm.

[0029] Furthermore, the arrangement of the pull-out resistance material 50 on the two side portions of the column 11 on which the column-side bracket 17 is not provided will be specifically described. As shown in Fig. 7, a long pull-out resistance material 50 is fastened to the stiffener 23a via a splice plate 35 and a bolt 36. Then, the pull-out resistance material 50 is disposed along the longitudinal direction of the side surface of the column 11a (see Fig. 6). As shown in FIG. 7, the stiffener 23a is provided across the upper column side diaphragm 15 and the lower column side diaphragm 16 for reinforcement. The lower end 50a of the pull-out resistance material 50 is fastened to the rib plate 40 of the column base metal fitting 32 provided on the foundation 42 via a splice plate 35 and a bolt 36 (see FIG. 11).

[0030] In this way, the pull-out resistance materials 33, 50 are arranged vertically along the center of each of the four faces of the column 11 (lower column 11b), and the lower ends 33a, 50a of each pull-out resistance material 33, 50 are fastened to the rib plate 40 via splice plates 35 and bolts 36 (see Figures 7 and 11).

[0031] The pull-out resistance material 33 can be substituted with a flat plate pull-out resistance material such as a flat bar, or with a steel rod pull-out resistance material with flat steel welded to the end (see FIG. 10). Flat steel 33d is welded to both the upper and lower ends of steel rod pull-out resistance material 33b and steel rod 33c shown in FIG. 10, and a gusset plate is connected to flat steel 33d by bolts .

[0032] As shown in Figures 6, 11 to 13, the column base hardware 32 is a box-shaped square steel pipe 55 having a column-side horizontal steel plate 38 at the top and a base plate 39 at the bottom, with multiple reinforcing rib plates 40 provided between the two. A plurality of steel rods 41 are inserted from the underside of the column-side horizontal steel plate 38 and fastened to the lower end of the lower column 11b with high-strength bolts 47. On the foundation 42 side, a plurality of anchor bolts 43 are inserted from the upper side of the base plate 39 to fasten it to the foundation 42 .

[0033] By using the above configuration, even in wooden structures, pull-out resistance materials 33, 50 can be attached to the joint section 14, and the pull-out force is transmitted from the upper floor to the foundation, reinforcing the pull-out resistance applied to the parts of the column ends where steel rods 21a, 21b are inserted. [Example]

[0034] Next, we will explain the structure of the steel joint between the column and the beam in a two-way wooden rigid frame structure according to a third embodiment of the present invention. In this third embodiment, the same parts as those in the first and second embodiments are designated by the same reference numerals, and details thereof will be omitted. FIG. 14 is a perspective view showing a steel joint 13 between a column 11 and a beam 12, and clearly shows the inside of the column 11 and the beam 12 for ease of understanding.

[0035] In wooden buildings, corner columns have a large pull-out force, and when compressed, they resist the axial force using only the column base material. However, when tension is applied, the pull-out resistance applied to the part of the column end where the steel rods 21a and 21b are inserted can be reinforced by fastening the steel joint 13 at the column head to the column base hardware 32 at the column base with pull-out resistance material 44.

[0036] To explain in detail the arrangement of the pull-out resistance material 44, as shown in Figures 14 to 17, two upper and lower through diaphragms 46a and 46b connected by a reinforcing vertical steel plate 45 are arranged between the upper column side diaphragm 15 and the lower column side diaphragm 16. As shown in FIG. 16, the vertical steel plate 45 has a cross section formed in a cross shape.

[0037] As shown in FIG. 15, a pull-out resistance material 44 in the form of a steel rod such as a tie rod is inserted from the bottom to the top of the upper through diaphragm 46 a and fastened with a high-strength bolt 47 . Reference numeral 48 in FIG. 15 denotes a sheath pipe such as a square pipe or a round pipe. The pull-out resistance material 44 passes through the column through-hole 51 of the upper column 11a. As shown in FIG. 15, the upper column side diaphragm 15 is joined to the lower end of the upper column 11a, and is fastened to the lower end of the upper column 11a by inserting a plurality of steel rods 22a therethrough.

[0038] As shown in FIG. 15, a pull-out resistance material 44 in the form of a steel rod such as a tie rod is inserted from the top to the bottom of the lower through diaphragm 46b and fastened with a high-strength bolt 47. Reference numeral 48 in FIG. 15 denotes a sheath pipe such as a square pipe or a round pipe. The pull-out resistance material 44 passes through the through-hole 51 in the lower column 11b. As shown in FIG. 18, the lower end of the pull-out resistance material 44 is inserted through the column-side horizontal steel plate 38 of the column base hardware 32 and fastened to the base plate 39 with a high-strength bolt 49 . The lower column side diaphragm 16 is joined to the upper end of the lower column 11b, and is fastened to the upper end of the lower column 11b by inserting a plurality of steel rods 22b therethrough. 18 and 20, reference numeral 48 denotes a sheath tube, reference numeral 52 denotes a vertical steel plate provided between the column-side horizontal steel plate 38 and the base plate 39, and reference numeral 53 denotes a rib plate.

[0039] By using the above configuration, even in wooden structures, pull-out resistance material 44 can be attached to joint 14, and the pull-out force is transmitted from the upper floor to the foundation, reinforcing the pull-out resistance applied to the part of the column end where steel rods 21a, 21b are inserted. [Example]

[0040] Next, we will explain the structure of the steel joint between the column and the beam in a two-way wooden rigid frame structure according to a fourth embodiment of the present invention. In this fourth embodiment, the same parts as those in the first, second, and third embodiments are designated by the same reference numerals, and details thereof will be omitted. FIG. 21-1 is a perspective view showing a steel joint 13 between a column 11 and a beam 12, and clearly shows the inside of the column 11 and the beam 12 for easy understanding. FIG. 21-2 is a perspective view showing the joint 14 made up of the box steel plate 61 and the cross-shaped reinforcing steel plate member 62 in an separated state.

[0041] As shown in FIGS. 21-1 to 24, the joint portion 14 is made up of a box steel plate 61 and a cross-shaped reinforcing steel plate member 62 incorporated inside the box steel plate 61. As shown in FIG. 21-2, an upper four-part diaphragm 63 and a lower four-part diaphragm 64 are provided between the box steel plate 61 and the cross-shaped reinforcing steel plate member 62.

[0042] As shown in FIG. 21-2, the box steel plate 61 is configured by welding the sides of four steel plates 61a, 61b, 61c, and 61d together to form a hollow rectangular column. That is, in the box steel plate 61, the vertically erected steel plates 61a, 61b, 61c, and 61d each form one surface of the hollow prismatic column. In this way, by forming the box steel plate 61 using four steel plates 61a, 61b, 61c, and 61d, there is no restriction to a predetermined standard size, as compared to the case where a joint made of square steel pipes is used in the first embodiment. In other words, by arbitrarily setting the sizes of the steel plates 61a, 61b, 61c, and 61d, it is possible to freely design the size of the joint 14 to match the size of the column.

[0043] As shown in FIGS. 21-2, 22, 23 and 24, a cross-shaped reinforcing steel plate member 62 is incorporated inside the box steel plate 61. As shown in Figure 21-2, the cross-shaped reinforcing steel plate member 62 is formed by welding three reinforcing steel plates 62a, 62b, and 62c into a cross shape when viewed from above, and the tip portions of the reinforcing steel plates 62a, 62b, and 62c are welded to the inside of the steel plates 61a, 61b, 61c, and 61d, respectively. As shown in Figures 21-1 and 22, an upper column side diaphragm 15 is provided on the upper part of the cross-shaped reinforcing steel plate member 62, and a lower column side diaphragm 16 is provided on the lower part of the cross-shaped reinforcing steel plate member 62. In this case, the advantage of using the cross-shaped reinforcing steel plate member 62 is that the upper column side diaphragm 15 can transmit force in a contact state without welding. In other words, the upper column side diaphragm 15 can be provided in a metal-to-metal contact.

[0044] Four upper four-piece diaphragms 63 are present between the box steel plate 61 and the cross-shaped reinforcing steel plate member 62 (see Figures 21-1 and 23). Four lower four-piece diaphragms 64 are present between the box steel plate 61 and the cross-shaped reinforcing steel plate member 62 (see Figure 21-1). As shown in FIG. 21-2, the four upper quarter-divided diaphragms 63 and the four lower quarter-divided diaphragms 64 are formed with their four corners cut off. Each upper four-part diaphragm 63 is formed by welding each of its four sides to the steel plates 61a, 61b, 61c, 61d and reinforcing steel plates 62a, 62b, 62c at the corresponding positions. Similarly, each lower four-part diaphragm 64 is formed by welding each of its four sides to the steel plates 61a, 61b, 61c, 61d and reinforcing steel plates 62a, 62b, 62c at corresponding positions. Furthermore, the upper four-part diaphragm 63 and the lower four-part diaphragm 64 are located at the same height as the horizontal steel plate 25 .

[0045] In this way, the joint section 14 has a box steel plate 61 and a cross-shaped reinforcing steel plate member 62, as well as an upper four-piece diaphragm 63 and a lower four-piece diaphragm 64, which makes it possible to prevent buckling between the cross-shaped reinforcing steel plate member 62 and the box steel plate 61. Compared to using a joint section made of square steel pipes in the first embodiment, this has the advantage of allowing the thickness of the upper column-side diaphragm 15 and the lower column-side diaphragm 16 to be reduced, resulting in a lighter weight.

[0046] 21-1 to 24 of the fourth embodiment show the case where it is used for a center column in a building where the pull-out force is relatively small, but in the case of a corner column where the pull-out force is large, as in the second embodiment (see FIG. 6), it is also possible to protrude the stiffener 23a (see FIG. 7) and the rib plate 40 (see FIG. 11) of the footing hardware 32 outward and arrange the pull-out resistance material along the longitudinal direction of the side of the column 11 via the splice plate 35 and bolt 36.

[0047] Next, we will explain the column base hardware 32. As shown in Figures 25 and 27, it has a column-side horizontal steel plate 38 at the top and a base plate 39 at the bottom. Between the column-side horizontal steel plate 38 and the base plate 39 at the bottom, a box steel plate 71 is provided, inside which a cross-shaped reinforcing steel plate member 72, which is cross-shaped when viewed from above, is incorporated to prevent buckling. A plurality of reinforcing rib plates 53 are provided on the outside of the box steel plate 71.

[0048] A plurality of steel rods 41 are inserted from the underside of the column-side horizontal steel plate 38 and fastened to the lower end of the lower column 11b with high-strength bolts 47. The base 42 side is fastened to the base by inserting a plurality of anchor bolts 43 from the upper side of the base plate 39. [Explanation of symbols]

[0049] 11 pillars 11a Upper column 11b Lower column 12 Beam 12a end 13 Steel joints 14 Joint 15 Upper column side diaphragm 16 Lower column side diaphragm 17 Pillar side bracket 18 splice plate 19 High-strength bolts 20 Beam side bracket 21 Beam side flange 22a, 22b, 22c steel rod 23, 23a Stiffener 24 Web 25 horizontal steel plate 25a Upper horizontal steel plate 25b Lower horizontal steel plate 26 Web 27 horizontal steel plate 30 Equipment piping sleeve 31 Shear Key 32 Column base hardware 33 Pull-out resistance material 33a Lower end 33b Steel bar pullout resistance material 33c steel bar 33d flat steel 34 Gusset Plate 35 splice plate 36 volts 37 Inner diaphragm 38 Column side horizontal steel plate 39 Base Plate 40 Rib Plate 41 Steel rod 42 Basics 43 Anchor bolt 44 Pull-out resistance material 45 Vertical steel plate 46a Upper through diaphragm 46b Lower through diaphragm 47 High-strength bolt 48 Sheath 49 High-strength bolts 50 Pull-out resistance material 50a Lower end 51 Through hole in column 52 Vertical steel plate 53 Rib Plate 54 Nut 55 Square steel pipe 56 Washer 57 High Nut 61 Box Steel Plate 61a, 61b, 61c, 61d steel plate 62 Cross-shaped reinforcing steel plate member 62a, 62b, 62c reinforced steel plate 63 Upper 4-part diaphragm 64 Lower 4-part diaphragm 71 Box Steel Plate 72 Cross-shaped reinforcing steel plate member

Claims

1. A structure of a steel joint between a column and a beam in a wooden two-way rigid frame structure, The steel joint is a joint made of a square steel pipe or a box steel plate formed by welding four steel plates into a hollow square column shape; an upper column side diaphragm provided at an upper portion of the joint; a lower column side diaphragm provided at a lower part of the joint portion; a column-side bracket provided on each side of the joint; a beam-side bracket rigidly joined to the column-side bracket; A beam side flange connected to the beam side bracket and joined to the end of the beam, A steel rod is inserted through the upper column side diaphragm and fastened to the lower end of the upper column, A steel rod is inserted through the lower column side diaphragm and fastened to the upper end of the lower column, The beam flange is configured to be fastened to the end of the beam by inserting a steel rod through it. The structure of the steel joint between the column and the beam in a two-way wooden frame structure.

2. a long pull-out resistance material is connected to the upper column side diaphragm and the lower column side diaphragm via a gusset plate, The pull-out resistance material is arranged along the longitudinal direction of the side surfaces of the upper column and the lower column.

2. A structure of a steel joint between a column and a beam in a wooden two-way rigid frame structure according to claim 1.

3. Two upper and lower through diaphragms connected by a vertical steel plate are disposed between the upper column side diaphragm and the lower column side diaphragm, A long pull-out resistance material is connected to each of the through diaphragms; The pull-out resistance material is arranged along the through holes in the upper and lower columns.

2. A structure of a steel joint between a column and a beam in a wooden two-way rigid frame structure according to claim 1.

4. The lower end of the pull-out resistance material arranged along the lower column or along the column through-hole is joined to a column base metal fitting provided on the foundation.

4. A structure of a steel joint between a column and a beam in a wooden two-way rigid frame structure according to claim 2 or 3.

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