JP2017214717A - Coupling structure for pole-beam joint and beam - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attain reduction of cost and to improve stability of an entire building while ensuring earthquake resistance.SOLUTION: A pole-beam joint 10A couples vertically adjacent steel pipe poles 12A and 12B, and a steel beam 14 is coupled to the pole-beam joint 10A. The pole-beam joint 10A comprises a joint body 16 and a bracket 18. The joint body 16 is configured by including an upper diaphragm 20A, a lower diaphragm 20B and a steel pipe part 22. The bracket 18 has depth of the same dimension as a height of the joint body 16 and is deposited to the joint body 16. The steel beam 14 has depth of a dimension smaller than depth of the bracket 18 and is fastened to the bracket 18. A reinforcing member 28 is deposited on a lower face of an end of the steel beam 14 coupled to the bracket 18, and depth of the end of the steel beam 14 including the reinforcing member 28 is formed in the same dimension as the depth of the bracket 18.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a connection structure between a column beam joint and a beam.

Traditionally, building beams must have a cross section with sufficient rigidity and strength for long-term loads acting in the vertical direction, such as fixed loads and load loads, and short-term loads acting in the horizontal direction, such as earthquakes and winds. There is.
In general, a steel beam is designed with the same cross section over its entire length. On the other hand, when receiving a horizontal force such as an earthquake, the bending moment acting on the beam is large at the end of the beam and small at the center. For this reason, when the beam has the same cross section over its entire length, the beam center may be overdesigned with respect to the beam end.
As a solution to this, there is a design method (Japanese Patent Laid-Open No. 2013-181292) using a vertical haunch. By providing a vertical haunch at the beam end, the center of the beam can be reduced in size, the amount of steel can be reduced, and a piping space can be provided under the beam at the center to ensure a high ceiling height.
However, in the case of a vertical haunch, the shape is complicated and labor is required, and the total length of the ready-made steel cannot be used, resulting in an increase in cost.
On the other hand, if a plastic hinge is generated at the location of the steel beam near the beam-column joint at the time of an earthquake, it is advantageous for improving the stability of the entire building.

JP2013-181292A

  The present invention has been made in view of the above circumstances, and the object of the present invention is advantageous in that it can be easily manufactured, and costs are reduced, and the stability of the entire building is enhanced while ensuring earthquake resistance. An object of the present invention is to provide a connection structure between a beam-column joint and a beam.

In order to achieve the above object, the present invention provides a connection structure between a beam-to-column joint and a beam provided between columns vertically adjacent to each other, and the beam-to-column joint includes a joint body, and a joint body. A bracket having a beam structure having the same dimensions as the height and being welded to the joint main body and projecting horizontally from the joint main body, the joint main body being connected to an upper end of a lower column, and The lower diaphragm larger than the cross section of the column, the upper diaphragm connected to the lower end of the upper column and larger than the cross section of the column, and the lower diaphragm and the upper diaphragm are connected to have the same contour as the contour of the column. A steel beam having a beam size smaller than the beam size of the bracket, the height of the upper surface of the steel beam being matched to the height of the upper surface of the bracket. Through bolts and nuts The reinforcing member is welded to the lower surface of the end of the steel beam connected to the bracket, and the beam forming of the end of the steel beam including the reinforcing member is the same as the beam forming of the bracket. The reinforcing member is formed to have a size and is fastened to the bracket via a bolt and a nut.
Further, the present invention is a connection structure between a beam-column joint portion and a beam provided between steel pipe columns adjacent in the vertical direction, and the beam-column joint portion is the same as the height of the joint body and the joint body. And a bracket projecting horizontally from the joint body, the joint body being connected to an upper end of a lower pillar and having a lower diaphragm larger than the cross section of the pillar, The upper diaphragm connected to the lower end of the upper column and larger than the cross section of the column, and the lower diaphragm and the upper diaphragm are connected to each other, and includes a steel pipe portion having the same contour as the column outline, The bracket includes a main bracket portion having a beam size smaller than the height of the joint body, and a reinforcing member welded on or below the main bracket portion and having a beam size smaller than that of the main bracket portion. , The main One end of the steel beam in socket portion is fastened through bolts, nuts, RyoNaru of RyoNaru said steel beam of the main bracket unit is characterized by being formed with the same dimensions.

According to the present invention, the location of the steel beam adjacent to the end of the reinforcing member on the side away from the column-beam joint is a location where the section modulus changes drastically smaller than the portion of the steel beam to which the reinforcing member is welded. Thus, it is possible to reliably generate a plastic hinge at this location during an earthquake.
Therefore, it is advantageous to prevent damage to the brackets and the ends of the steel beam located on the column beam joint side, and to improve the stability of the entire building while ensuring earthquake resistance.
In addition, no special processing is required other than attaching the reinforcing member to the end of the beam constituting the steel beam by welding, or no special processing is required other than attaching the reinforcing member to the main bracket by welding. Therefore, it can be easily manufactured, which is advantageous for cost reduction.

(A) is a front view showing a configuration of a connection structure between a beam-column joint and a beam according to the first embodiment, (B) is a sectional view taken along line BB of (A), and (C) is a diagram of (A) It is CC line sectional drawing. It is front sectional drawing which shows a column beam junction part, a steel pipe column, and a bracket among the connection structures of the column beam junction part and beam which concern on 1st Embodiment. FIG. 3 is a sectional view taken along line AA in FIG. 2. It is BB sectional drawing of FIG. It is a front view of a steel beam and a reinforcing member. It is AA sectional view taken on the line of FIG. (A) is a front view which shows the structure of the connection structure of the column beam junction part and beam which concerns on 2nd Embodiment, (B) is BB sectional drawing of (A), (C) is (A). It is CC line sectional drawing. It is a front view which shows a column beam junction part, a steel pipe column, a bracket, an upper reinforcement member, and a lower reinforcement member among the connection structure of the column beam junction part and a beam which concern on 2nd Embodiment. It is a front view of the edge part of a steel beam. It is AA sectional view taken on the line of FIG. (A) is a front view which shows the structure of the connection structure of the beam-column joint part and beam which concerns on 3rd Embodiment, (B) is BB sectional drawing of (A), (C) is (A). It is CC line sectional drawing. It is front sectional drawing which shows a column beam junction part, a steel pipe pillar, a bracket, and a reinforcement member among the connection structure of the column beam junction part and beam which concern on 3rd Embodiment. It is a front view of the edge part of a steel beam. It is AA sectional view taken on the line of FIG.

Next, the present embodiment will be described with reference to the drawings.
(First embodiment)
First, a first embodiment of a connection structure between a column beam joint and a beam will be described.
As shown in FIGS. 1 and 3, the beam-column joint 10A is provided between the steel pipe columns 12A, 12B adjacent to each other in the vertical direction, and connects the steel tube columns 12A, 12B. The steel beam is connected to the beam-column joint 10A. The beam 14 is connected. In the present embodiment, the steel pipe columns 12A and 12B have a rectangular cross section, but various conventionally known cross sectional shapes such as a circular shape can be employed for the steel pipe columns 12A and 12B.
The column beam joint 10 </ b> A includes a joint body 16 and a bracket 18.

As shown in FIGS. 2, 3, and 4, the joint main body 16 includes an upper diaphragm 20 </ b> A, a lower diaphragm 20 </ b> B, and a steel pipe portion 22.
The upper diaphragm 20A is welded to the lower ends of the upper steel pipe columns 12A and 12B and has a rectangular shape that is larger than the cross section of the steel pipe columns 12A and 12B and closes the internal space of the steel pipe columns 12A and 12B.
The lower diaphragm 20B is welded to the upper ends of the lower steel pipe columns 12A and 12B and has a rectangular shape that is larger than the cross section of the steel pipe columns 12A and 12B and closes the internal space of the steel pipe columns 12A and 12B.
The steel pipe portion 22 has the same contour as the steel pipe columns 12A and 12B, in other words, has the same cross-sectional shape as the steel pipe columns 12A and 12B, and connects the upper diaphragm 20A and the lower diaphragm 20B.

As shown in FIGS. 1A and 2, the bracket 18 has a beam having the same dimension as the height of the joint body 16 and is welded to the joint body 16 so as to project from the joint body 16 in the horizontal direction. Has been.
The bracket 18 is made of an I-shaped steel having upper and lower flanges 1802 and 1804 and a web 1806 connecting the flanges 1802 and 1804.
The upper surface of the upper flange 1802 of the I-shaped steel constituting the bracket 18 is provided at the same height as the upper surface of the upper diaphragm 20A, and the lower surface of the lower flange 1804 is provided at the same height as the lower surface of the lower diaphragm 20B. Yes. Therefore, the end face of the upper flange 1802 facing the horizontal direction and the end face of the upper diaphragm 20A facing the horizontal direction are welded.
As shown in FIGS. 2 and 3, a plurality of bolt insertion holes 1810 are provided at the end of the upper flange 1802 and the end of the lower flange 1804 apart from the joint body 16.
In addition, a plurality of bolt insertion holes 1812 are provided in the upper half of the end portion of the web 1806 that is separated from the joint body 16.

As shown in FIG. 1 (A), the steel beam 14 has a beam size smaller than that of the bracket 18 and is detachably fastened to the bracket 18 via bolts 24 and nuts 26.
As shown in FIGS. 5 and 6, the steel beam 14 is made of I-shaped steel having upper and lower flanges 1402 and 1404 and a web 1406 connecting the flanges 1402 and 1404.
As shown in FIG. 5, a plurality of bolt insertion holes 1410 are provided in the upper flange 1402 of the end portion of the steel beam 14.
The web 1406 at the end of the steel beam 14 is provided with a plurality of bolt insertion holes 1412.

As shown in FIGS. 1A, 1 </ b> B, 5, and 6, the reinforcing member 28 is welded to the lower surface of the lower flange 1404 at the end of the steel beam 14 connected to the bracket 18.
The beam formation at the end of the steel beam 14 including the reinforcing member 28 is formed with the same dimensions as the beam formation of the bracket 18.
The reinforcing member 28 has a flange 2802 and a web 2804 and is made of T-shaped steel in which the web 2804 is welded to the lower flange 1404 of the steel beam 14.
As shown in FIG. 5, the flange 2802 at the end of the reinforcing member 28 is provided with a plurality of bolt insertion holes 2810.
The upper surface of the upper flange 1402 of the steel beam 14 is positioned at the same height as the upper surface of the bracket 18, and the lower surface of the upper flange 1402 of the steel beam 14 is positioned at the same height as the lower surface of the bracket 18.
Further, the upper surface of the flange 2802 of the reinforcing member 28 is located at the same height as the upper surface of the lower flange 1804 of the bracket 18, and the lower surface of the flange 2802 of the reinforcing member 28 is the same as the lower surface of the lower flange 1804 of the bracket 18. Located at height.
That is, the upper flange 1802 of the bracket 18 and the upper flange 1402 of the steel beam 14 have the same thickness, and the lower flange 1804 of the bracket 18 and the flange 2802 of the reinforcing member 28 have the same thickness. ing.
The web 1406 of the steel beam 14 has the same thickness as the web 1806 of the bracket 18, and both surfaces of the web 1406 of the steel beam 14 and both surfaces of the web 1806 of the bracket 18 are located on the same surface.
Further, the web 2804 of the reinforcing member 28 has the same thickness as the web 1806 of the bracket 18 similarly to the web 1406 of the steel beam 14, and both sides of the web 2804 of the reinforcing member 28 and both sides of the web 1806 of the bracket 18. Are located on the same plane.

As shown in FIGS. 1A, 1 </ b> B, and 1 </ b> C, the bracket 18 and the steel beam 14 are connected by connecting the web 1806 of the bracket 18 and the web 1406 of the steel beam 14. This is done by connecting the flange 1802 and the upper flange 1402 of the steel beam 14.
More specifically, the web 1806 of the bracket 18 and the web 1406 of the steel beam 14 are connected to each other on both sides of the web 1806 of the bracket 18 and the web 1406 of the steel beam 14 as shown in FIGS. The connection plate 30 having a plurality of bolt insertion holes formed on both sides of the connection plate 30 is attached, and the nut 26 is fastened to the bolt 24 inserted through the connection plate 30 on both sides, the web 1806 of the bracket 18 and the web 1406 of the steel beam 14. It is made by letting.
Further, the upper flange 1804 of the bracket 18 and the upper flange 1402 of the steel beam 14 are connected to both the upper and lower surfaces of the upper flange 1802 of the bracket 18 and the upper surface of the steel beam 14 as shown in FIGS. The connection plates 32A and 32B in which a plurality of bolt insertion holes are formed across the upper and lower surfaces of the flange 1402 are applied, and the connection plates 32A and 32B on both sides, the upper flange 1802 of the bracket 18 and the upper flange 1402 of the steel beam 14 are attached. This is done by fastening a nut 26 to the inserted bolt 24.
The bracket 18 and the reinforcing member 28 are connected to each other by connecting plates 34A and 34B in which a plurality of bolt insertion holes are formed across the upper and lower surfaces of the lower flange 1804 of the bracket 18 and the upper and lower surfaces of the flange 2802 of the reinforcing member 28. The nuts 26 are fastened to the bolts 24 inserted into the connecting plates 34A and 34B on both sides, the lower flange 1804 of the bracket 18 and the flange 2802 of the reinforcing member 28.

According to the first embodiment, the location of the steel beam 14 adjacent to the end of the reinforcing member 28 on the side away from the column beam joint 10A is compared to the portion of the steel beam 14 to which the reinforcing member 28 is welded. This is where the section modulus changes rapidly and smallly.
Therefore, it is possible to reliably generate a plastic hinge at this location in the event of an earthquake, prevent damage to the ends of the bracket 18 and the steel beam 14 located on the column beam joint 10A side, and ensure earthquake resistance while ensuring earthquake resistance. This is advantageous in increasing the overall stability.
Further, by using a beam material having a different beam structure in the central portion of the steel beam 14 and the bracket 18 corresponding to the beam end of the steel beam 14, a steel frame having the same length as the beam structure of the bracket 18 is formed. The amount of steel used can be reduced as compared with the beam 14, and the cost can be reduced.
Further, since no special processing is required other than attaching the T-shaped steel forming the reinforcing member 28 to the end of the beam forming the steel beam 14 by welding, the beam material created by vertical haunch processing or BH processing. It is easier to process and can reduce costs.
Further, the steel beam 14 has a bracket 18 having a larger beam than the steel beam 14 at the end thereof, thereby preventing breakage at the beam end of the steel beam 14 connected to the conventional column beam joint 10A. The seismic performance can be improved compared to the non-bracket method, and the connecting part between the steel beam 14 and the bracket 18 is used for the switching section of the beam cross section to reduce the connection part and reduce the processing required for beam reinforcement. Simplification of processing and cost reduction can be achieved.
Further, by making the reinforcing member 28 T-shaped steel, the stress transmission from the lower flange 1404 of the steel beam 14 to the bracket 18 which is the end beam material via the web 2804 becomes smooth, and the stress concentration on a part. It is advantageous in preventing the above.
Further, by attaching the reinforcing member 28 to the steel beam 14, it is not necessary to consider the required length of the reinforcing member 28 in the length of the bracket 18, which is advantageous for rational design of the bracket 18.
The upper and lower surfaces of the upper flange 1402 of the steel beam 14 are positioned at the same height as the upper and lower surfaces of the bracket 18, and the upper and lower surfaces of the upper flange 1402 of the steel beam 14 are the upper and lower surfaces of the bracket 18. The both sides of the web 1406 of the steel beam 14 and the both sides of the web 1806 of the bracket 18 are located on the same plane.
For this reason, the bracket 18 and the steel beam 14 can be easily and reliably connected to each other using the connecting plates 30, 34 </ b> A, 34 </ b> B made of flat steel, thereby simplifying the connecting operation and reducing costs. Is advantageous.

(Second Embodiment)
Next, a second embodiment will be described with reference to FIGS.
In the following embodiments, the same parts and members as those in the first embodiment are denoted by the same reference numerals as those in the first embodiment, and description thereof is omitted.
As shown in FIG. 7A, the beam-column joint portion 10B includes a joint portion main body 16 and a bracket 36. The structure of the beam-column joint portion main body 16 is the same as that of the first embodiment, and the upper diaphragm 20A, the lower diaphragm 20B, and the steel pipe part 22 are comprised.

The bracket 36 includes a main bracket portion 38 having a beam that is smaller than the height of the joint main body 16 and a reinforcing member 40 that is connected to the main bracket portion 38 above or below the beam and that has a beam that is smaller than the main bracket portion 38. ing.
In the present embodiment, the main bracket portion 38 has a beam having a dimension smaller than the height of the column beam joint portion 10B, and is welded to an intermediate portion of the steel pipe portion 22 in the height direction.
The main bracket portion 38 is made of I-shaped steel having upper and lower flanges 3802 and 3804 oriented in the horizontal direction and a web 3806 connecting the flanges 3802 and 3804.
One end of a steel beam 42 is detachably connected to the main bracket portion 38 via a bolt 24 and a nut 26.
As shown in FIG. 8, a plurality of bolt insertion holes 3810 are provided in the upper and lower flanges 3802 and 3804 at the end of the main bracket portion 38 apart from the column beam joint portion 10B.
In addition, a plurality of bolt insertion holes 3812 are provided in the web 3806 at the end of the main bracket portion 38 that is separated from the column beam joint portion 10B.

In the present embodiment, the reinforcing member 40 includes an upper reinforcing member 40A and a lower reinforcing member 40B that are disposed above and below the main bracket portion 38. In the present embodiment, the height of the upper reinforcing member 40A is smaller than the height of the lower reinforcing member 40B, but the upper reinforcing member 40A and the lower reinforcing member 40B are formed at the same height. May be.
As shown in FIGS. 8 and 10, the upper reinforcing member 40A is composed of a T-shaped steel in which a web 4004A is welded to the upper flange 3802 and the steel pipe portion 22 of the main bracket portion 38 and the flange 4002A is welded to the upper diaphragm 20A. ing.
The lower reinforcing member 40B is formed of a T-shaped steel in which a web 4004B is welded to the lower flange 3804 and the steel pipe portion 22 of the main bracket portion 38 and a flange 4002B is welded to the lower diaphragm 20B.
The end surface facing the horizontal direction of the upper diaphragm 20A and the end surface facing the horizontal direction of the flange 4002A of the upper reinforcing member 40A are welded, and the upper surface of the flange 4002A of the upper reinforcing member 40A is the same as the upper surface of the upper diaphragm 20A. Located at height.
The end surface facing the horizontal direction of the lower diaphragm 20B and the end surface facing the horizontal direction of the flange 4002B of the lower reinforcing member 40B are welded.
Further, the flange 4002B of the lower reinforcing member 40B is located at the center portion in the thickness direction of the lower diaphragm 20B.

As shown in FIGS. 7A and 9, the steel beam 42 has a beam formation having the same dimensions as the beam formation of the main bracket portion 38, and can be attached to and detached from the main bracket portion 38 via bolts 24 and nuts 26. It is concluded to.
As in the first embodiment, the steel beam 42 is made of I-shaped steel having upper and lower flanges 4202 and 4204 and a web 4206 connecting the flanges 4202 and 4204.
The upper and lower surfaces of the upper flange 4202 of the steel beam 42 are positioned at the same height as the upper and lower surfaces of the upper flange 3802 of the main bracket portion 38, and the upper and lower surfaces of the lower flange 4204 of the steel beam 42 are the main bracket portion. 38 is located at the same height as the upper and lower surfaces of the lower flange 3804.
That is, the upper flange 3802 of the main bracket portion 38 and the upper flange 4202 of the steel beam 42 have the same thickness, and the lower flange 3804 of the main bracket portion 38 and the lower flange 4204 of the steel beam 42 are the same. It has a thickness.
The web 4206 of the steel beam 42 has the same thickness as the web 3806 of the main bracket portion 38, and both surfaces of the web 4206 of the steel beam 42 and both surfaces of the web 3806 of the main bracket portion 38 are located on the same surface. ing.
Further, the webs 4004A and 4004B of the reinforcing members 40A and 40B have the same thickness as the web 3806 of the main bracket portion 38, similarly to the web 4206 of the steel beam 42, and the webs 4004A and 4004B of the reinforcing members 40A and 40B. Both surfaces and both surfaces of the web 3806 of the main bracket portion 38 are located on the same surface.
As shown in FIG. 9, a plurality of bolt insertion holes 4210 are provided in the upper and lower flanges 4202, 4204 at the end of the steel beam 42.
The web 4206 at the end of the steel beam 42 is provided with a plurality of bolt insertion holes 4212.

As shown in FIGS. 7A and 7C, the main bracket portion 38 and the steel beam 42 are connected by connecting the web 3806 of the main bracket portion 38 and the web 4206 of the steel beam 42 to each other. The upper and lower flanges 3802 and 3804 are connected to the upper and lower flanges 4202 and 4204 of the steel beam 42.
More specifically, the web 3806 of the main bracket portion 38 and the web 4206 of the steel beam 42 are connected to each other by a plurality of bolt insertion holes extending over both surfaces of the web 3806 of the main bracket portion 38 and both surfaces of the web 4206 of the steel beam 42. The formed connection plate 44 is applied, and the nut 26 is fastened to the bolts 24 inserted into the connection plates 44 on both sides, the web 3806 of the main bracket portion 38 and the web 4206 of the steel beam 42.
7B and 7C, the upper and lower flanges 3802 and 3804 of the main bracket portion 38 and the upper and lower flanges 4202 and 4204 of the steel beam 42 are connected to the upper and lower portions of the main bracket portion 38. A connection plate 46 in which a plurality of bolt insertion holes are formed over both the upper and lower surfaces of the flanges 3802 and 3804 and the upper and lower surfaces of the upper and lower flanges 4202 and 4204 of the steel beam 42 is applied. The nut 26 is fastened to the bolt 24 inserted through the upper and lower flanges 3802, 3804 and the upper and lower flanges 4202, 4204 of the steel beam 42.

According to the second embodiment, as in the first embodiment, the section modulus between the end of the bracket 36 and the end of the steel beam 42 is sharply smaller than that of the bracket 36. It is a changing part.
Therefore, it is possible to reliably generate a plastic hinge at the end of the steel beam 42 at the time of an earthquake, prevent damage to the bracket 36 welded to the column beam joint 10B side, and improve the stability of the entire building and earthquake resistance. It is advantageous in securing
Further, attaching the reinforcing members 40A and 40B made of T-shaped steel to the bracket 18 eliminates the need for special processing on the steel beam 42, which is advantageous in reducing costs.
Further, since the attachment positions of the reinforcing members 40A and 40B can be selected from the lower surface or the upper and lower surfaces of the bracket body 38, the efficiency of the stepped beams having different beam structures on both sides in the column beam joint portion 10A is improved regardless of the beam structure of the other party. In particular, the steel beam 42 can be installed, which is advantageous for cost reduction. At this time, the flanges 4202 and 4204 of the steel beam 42 are not joined to the joint body 16 but are joined to the flanges 3802 and 3804 of the bracket body 38, so that the diaphragm of the column beam joint 10B can be reduced by one step.
Further, the reinforcing members 40 </ b> A and 40 </ b> B made of T-shaped steel can connect not only the flange 4002 but also the web 4004 to the bracket body 38. This is advantageous in dealing with a case where proof stress is required.
The upper and lower surfaces of the upper flange 4202 of the steel beam 42 are positioned at the same height as the upper and lower surfaces of the upper flange 3802 of the main bracket portion 38, and the upper and lower surfaces of the lower flange 4204 of the steel beam 42 are The upper surface and the lower surface of the lower flange 3804 of the bracket portion 38 are located at the same height, and both surfaces of the web 4206 of the steel beam 42 and both surfaces of the web 3806 of the main bracket portion 38 are located on the same surface. .
For this reason, the main bracket portion 38 and the steel beam 42 can be easily and securely connected using the connecting plates 44 and 46 made of flat steel, thereby simplifying the connecting operation and reducing the cost. Is advantageous.

(Third embodiment)
Next, a third embodiment will be described with reference to FIGS.
In the third embodiment, the structure of the reinforcing member 48 is different from that of the second embodiment.
That is, as shown in FIG. 11A, in the third embodiment, the reinforcing member 48 is configured by a lower reinforcing member 48A disposed below the main bracket portion 38 and having a smaller beam than the main bracket portion 38. Has been.
The end surface facing the horizontal direction of the upper diaphragm 20A and the end surface facing the horizontal direction of the upper flange 3802 of the main bracket portion 38 are welded.
The lower surface of the upper flange 3802 of the main bracket portion 38 is located at the same height as the lower surface of the upper diaphragm 20A.
The lower reinforcing member 48 </ b> A is formed of a T-shaped steel having a flange 4802 and a web 4804.
The web 4804 of the lower reinforcing member 48A is welded to the lower flange 3804 and the steel pipe portion 22 of the main bracket portion 38, and faces the horizontal end surface of the flange 4802 of the lower reinforcing member 48A and the horizontal direction of the lower diaphragm 20B. It is welded to the end face.
Further, the flange 4802 of the lower reinforcing member 48A is located at the center portion in the thickness direction of the lower diaphragm 20B.
As shown in FIG. 12, a plurality of bolt insertion holes 3810 are provided in the upper and lower flanges 3802 and 3804 at the end of the main bracket portion 38 apart from the column beam joint portion 10C.
In addition, a plurality of bolt insertion holes 3812 are provided in the web 3806 at the end of the main bracket portion 38 that is separated from the column beam joint portion 10C.

As shown in FIG. 11A, the steel beam 42 has a beam formation having the same dimensions as the beam formation of the main bracket portion 38, and is detachably fastened to the main bracket portion 38 via bolts 24 and nuts 26. ing.
As shown in FIGS. 11A and 14, the steel beam 42 has an I-shape having upper and lower flanges 4202 and 4204 and a web 4206 connecting the flanges 4202 and 4204, as in the second embodiment. Consists of steel.
As shown in FIG. 11A, the upper and lower surfaces of the upper flange 4202 of the steel beam 42 are positioned at the same height as the upper and lower surfaces of the upper flange 3802 of the main bracket portion 38, and the lower flange of the steel beam 42 The upper and lower surfaces of 4204 are positioned at the same height as the upper and lower surfaces of the lower flange 3804 of the main bracket portion 38.
The web 4206 of the steel beam 42 has the same thickness as the web 3806 of the main bracket portion 38, and both surfaces of the web 4206 of the steel beam 42 and both surfaces of the web 3806 of the main bracket portion 38 are located on the same surface. ing.
Further, the web 4804 of the reinforcing member 48 has the same thickness as the web 3806 of the main bracket portion 38, similar to the web 4206 of the steel beam 42, and both the surfaces of the web 4804 of the reinforcing member 48 and the main bracket portion 38. Both surfaces of the web 3806 are located on the same surface.
That is, the upper flange 3802 of the main bracket portion 38 and the upper flange 4202 of the steel beam 42 have the same thickness, and the lower flange 3804 of the main bracket portion 38 and the lower flange 4204 of the steel beam 42 are the same. It has a thickness.
As shown in FIG. 13, a plurality of bolt insertion holes 4210 are provided in the upper and lower flanges 4202, 4204 at the end of the steel beam 42.
The web 4204 at the end of the steel beam 42 is provided with a plurality of bolt insertion holes 4212.

  As shown in FIGS. 11A and 11C, the connection between the main bracket portion 38 and the steel beam 42 is the same as in the second embodiment, and the connection plate 44, the bolt 24, and the nut 26 are used. The web 3806 of the main bracket portion 38 and the web 4206 of the steel beam 42 are connected to each other, and connection plates 46A and 46B, bolts 24, and nuts 26 are used as shown in FIGS. Thus, the upper and lower flanges 3802 and 3804 of the main bracket portion 38 and the upper and lower flanges 4202 and 4204 of the steel beam 42 are connected.

  According to the third embodiment, it is possible to reliably generate a plastic hinge at the end of the steel beam 42 at the time of an earthquake, prevent damage to the bracket 36 welded to the column beam joint 10C side, The same effects as those of the second embodiment are obtained, such as being advantageous in improving the stability of the entire building while securing the property.

The brackets 18 and 36 are provided on at least two surfaces, three surfaces, or four surfaces of the joint body 16 having a rectangular cross section.
Further, the cross section of the column may be circular or the like, and is not limited to a rectangle.
Further, in the present embodiment, the case where the column to which the connection structure between the beam-column joint portion and the beam of the present invention is applied is a steel pipe column. However, the column may be an RC structure, an SRC structure, a CFT structure, or the like. There may be, and a pillar is not limited to a steel pipe pillar. When the pillar is made of CFT, the present invention can be applied in the same manner as the present embodiment. In addition, when the column is, for example, RC or SRC, a cap nut or stud bolt is embedded in the lower end of the upper column and the upper end of the lower column, and the cap nut or stud bolt is used for the bolt or nut. The upper diaphragm and the lower diaphragm may be connected to the lower end of the upper column and the upper end of the lower column.

10A, 10B, 10C Beam-column joints 12A, 12B Steel pipe column 14 Steel beam 1402 Upper flange 1404 Lower flange 1406 Web 16 Joint body 18 Bracket 1802 Upper flange 1804 Lower flange 1806 Web 20A Upper diaphragm 20B Lower diaphragm 22 Steel tube 24 Bolt 26 Nut 28 Reinforcement member 2802 Flange 2804 Web 36 Bracket 38 Main bracket portion 3802 Upper flange 3804 Lower flange 3806 Web 40 Reinforcement member 40A Upper reinforcement member 40B Lower reinforcement member 42 Steel beam 48 Reinforcement member 48A Lower reinforcement member 4802 Flange 4804 Web

Claims (6)

A connection structure between a beam-to-column joint provided between vertically adjacent columns and a beam,
The column beam joint includes a joint body, and a bracket having a beam having the same dimension as the height of the joint body, and welded to the joint body and projecting horizontally from the joint body. ,
The joint main body is connected to the upper end of the lower column and has a lower diaphragm larger than the cross section of the column, the upper diaphragm connected to the lower end of the upper column and larger than the cross section of the column, and these lower diaphragms And an upper diaphragm and a steel pipe part having the same contour as the contour of the column,
A steel beam having a beam size smaller than the beam size of the bracket is fastened to the bracket via bolts and nuts so that the height of the upper surface of the steel beam matches the height of the upper surface of the bracket,
A reinforcing member is welded to the lower surface of the end portion of the steel beam connected to the bracket,
The beam formation of the end of the steel beam including the reinforcing member is formed with the same dimensions as the beam formation of the bracket,
The reinforcing member is fastened to the bracket via bolts and nuts,
A connecting structure between a beam-column joint and a beam. The bracket and the steel beam are both made of I-shaped steel having upper and lower flanges and a web connecting the flanges,
The reinforcing member comprises a T-shaped steel having a web and a flange, and the web is welded to a lower flange of the steel beam.
The upper and lower surfaces of the upper flange of the steel beam are located at the same height as the upper and lower surfaces of the upper flange of the bracket,
The upper surface and the lower surface of the flange of the reinforcing member are located at the same height as the upper surface and the lower surface of the lower flange of the bracket,
Both sides of the steel beam web and both sides of the bracket web are located on the same plane,
The connecting structure of a beam-column joint and a beam according to claim 1. A connection structure between a beam-to-column joint provided between upper and lower steel pipe columns and a beam,
The column beam joint includes a joint body, and a bracket projecting in a horizontal direction from the joint body having a beam having the same dimension as the height of the joint body,
The joint main body is connected to the upper end of the lower column and has a lower diaphragm larger than the cross section of the column, the upper diaphragm connected to the lower end of the upper column and larger than the cross section of the column, and these lower diaphragms And an upper diaphragm and a steel pipe part having the same contour as the contour of the column,
The bracket includes a main bracket portion having a beam dimension smaller than the height of the joint body, and a reinforcing member welded on or below the main bracket portion and having a beam dimension smaller than that of the main bracket portion. And
One end of a steel beam is fastened to the main bracket part via bolts and nuts,
The beam formation of the main bracket portion and the beam formation of the steel beam are formed with the same dimensions,
A connecting structure between a beam-column joint and a beam. The reinforcing member is composed of an upper reinforcing member and a lower reinforcing member that are welded to the top and bottom of the main bracket portion,
The main bracket portion is welded to an intermediate portion in the height direction of the steel pipe portion, and has upper and lower flanges oriented in the horizontal direction and a web connecting the flanges, and is smaller than the height of the column beam joint portion. Composed of I-beams with
The upper reinforcing member is formed of a T-shaped steel in which a web is welded to the upper flange of the main bracket portion and the steel pipe portion, and a flange is welded to the upper diaphragm,
The lower reinforcing member is composed of a T-shaped steel in which a web is welded to the lower flange and the steel pipe portion of the main bracket portion, and a flange is welded to the lower diaphragm,
The steel beam is made of I-shaped steel having upper and lower flanges and a web connecting the flanges,
The upper and lower surfaces of the upper flange of the steel beam are located at the same height as the upper and lower surfaces of the upper flange of the main bracket portion,
The upper and lower surfaces of the lower flange of the steel beam are located at the same height as the upper and lower surfaces of the lower flange of the main bracket portion,
The both sides of the steel beam web and the both sides of the main bracket web are located on the same plane,
The connection structure between a beam-column joint and a beam according to claim 3. The reinforcing member is composed of a lower reinforcing member welded under the main bracket portion,
The main bracket portion is composed of an I-shaped steel having upper and lower flanges oriented in the horizontal direction and a web connecting the flanges and having a beam dimension smaller than the height of the column beam joint portion.
The end face of the main bracket portion facing the horizontal direction of the upper flange and the end face of the upper diaphragm facing the horizontal direction are welded,
The lower reinforcing member is made of a T-shaped steel in which a web is welded to the lower flange of the main bracket portion and the steel pipe portion, and the flange is parallel to the lower flange,
The end face of the lower reinforcing member facing the horizontal direction of the flange and the end face of the lower diaphragm facing the horizontal direction are welded,
The upper and lower surfaces of the upper flange of the steel beam are located at the same height as the upper and lower surfaces of the upper flange of the main bracket portion,
The upper and lower surfaces of the lower flange of the steel beam are located at the same height as the upper and lower surfaces of the lower flange of the main bracket portion,
The both sides of the steel beam web and the both sides of the main bracket web are located on the same plane,
The connection structure between a beam-column joint and a beam according to claim 3. The columns adjacent to each other in the vertical direction are both steel pipe columns,
The lower diaphragm is welded to the upper end of the lower steel pipe column and closes the internal space of the steel pipe column,
The upper diaphragm is welded to the lower end of the upper steel pipe column and closes the internal space of the steel pipe column,
The steel pipe part is formed in the same cross-sectional shape as the steel pipe column,
The connection structure between a column beam joint and a beam according to any one of claims 1 to 5.

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