JP2020101048A - Column-beam joint structure - Google Patents

Abstract

To reduce the welding work on site and to improve the cross-sectional performance at a beam end, and at the same time, to suppress a bolt slippage at a bolt joint of a joint plate.SOLUTION: A beam end of a beam member 3 made of H-shaped steel having a different beam formation on the center side of a span is bolted to a bracket member 2 provided at a joint portion on an orthogonal column surface 1a of a steel pipe column member 1. Each of the beam ends of a pair of beam members 3 is configured as a drop haunch that is formed by welding height-adjusted rib members 4 and 5 having flanges 4B and 5B on the lower side to the lower surfaces, so that the beam formation of the beam ends of the pair of beam members 3 is set to be equal. A pair of bracket members 2 and the upper and lower flanges at the beam end portions of the pair of beam members 3 that are adjacent to each other in the outer peripheral direction of the column member 1 are bolted to each other by a joining plate 40. The plastic hinge of the beam member 3 is moved away from a bolt joint portion 46 toward the center side of the span of the joint plate 40 by the drop haunch formed by the rib members 4 and 5.SELECTED DRAWING: Figure 2

Description

The present invention relates to a column-beam joint structure in which a beam end portion of a beam member made of H-shaped steel is bolted to a bracket member provided at a joint portion on a column surface orthogonal to a column member made of steel pipe.

As the above-mentioned column-beam joint structure, as shown in Patent Document 1, there is a column-beam joint structure using four beam members having the same beam formation over the entire span. In this column-beam joint structure, a bracket member made of H-shaped steel is joined by fillet welding to a joint portion on a column surface orthogonal to each other of a rectangular steel pipe forming the column member. The web of each bracket member and the web of the beam member are bolted to each other by a web bonding plate.
Further, the upper flanges of the pair of bracket members that are adjacent to each other in the outer peripheral direction of the pillar member and the upper flanges of the pair of beam members are bolted together by a flange joint plate spanning over them. Similarly, the lower flanges of the pair of bracket members and the lower flanges of the pair of beam members that are adjacent to each other in the outer peripheral direction of the pillar member are also bolted together by a flange joint plate that spans them.

JP, 2018-71147, A

In the above-described beam-column joining structure, since the bracket member is joined to the column surface of the column member by fillet welding, for example, compared to the case where the beam member is butt-welded to the through diaphragm of the column member in a butt state, It is possible to save labor in factory work including welding time in the factory. Moreover, when joining the flange joint plate for surely transmitting the stress of one beam member to the other beam members orthogonal to the column member, since the bolt joint is adopted instead of the weld joint, the welding technician can Welding work on site can be reduced in response to the decreasing labor environment.
However, when the beam formation of the pair of beam members adjacent to each other in the outer peripheral direction of the column member is different, the height levels of the flanges of the adjacent beam members do not match, so I can't do it.
Further, in the above-mentioned beam-column joint structure, when the plastic hinge of the beam member is located at the bolt joint portion of the flange joint plate, and when a large stress such as a bending moment acts, the flange joint plate slips at the bolt joint portion. There is a problem that (so-called bolt slipping) occurs.

In view of this actual situation, the main problem of the present invention is to reduce the welding work at the site and improve the cross-sectional performance at the beam end portion, and at the same time suppress the bolt slippage at the bolt joint portion of the joint plate. The point is to provide a column-beam joint structure that can be used.

A first characteristic configuration of the present invention is that a bracket member provided at a joint portion on a column surface orthogonal to a column member made of a steel pipe has a beam end portion of a beam member made of H-shaped steel having a different beam formation on a span center side. Is a column-beam connection structure that is bolted to
Each of the beam ends of the pair of beam members is configured as a drop haunch that is formed by welding a height-adjusted rib material having a flange on the lower side to a lower surface of the beam member. The beam configurations of the end portions are set to be equal, and the pair of bracket members adjacent to each other in the outer peripheral direction of the column member and the upper and lower flanges at the beam end portions of the pair of beam members are bolt-joined with a joining plate, The plastic hinge of the member is located in a position avoiding the span center side of the bolt joint portion of the joint plate by the drop haunch of the rib material.

According to the above configuration, when a pair of beam members made of H-shaped steel having different beam formations on the span center side are joined to the joints on the orthogonal column surfaces of the column members, the beams of the pair of beam members are joined. Since each of the end portions is configured as a drop haunch that is formed by welding a height-adjusted rib material having a flange on the lower side to the lower surface, the beam formation at the beam end portions of the pair of beam members becomes equal. The flange levels of both beam members that are adjacent to each other in the outer peripheral direction of the column member match. Accordingly, the pair of bracket members adjacent to each other in the outer peripheral direction of the column member and the upper and lower flanges at the beam end portions of the pair of beam members can be bolt-joined with the joining plate.
Moreover, the drop haunch by the rib material welded to the lower surface of the beam end improves the cross-sectional performance at the beam end that bears a large stress such as bending moment, and at the same time, the plastic hinge of the beam member is connected to the joint plate. It can be moved to a position avoiding it toward the center of the span with respect to the bolt joint.

Therefore, by joining the flange joint plate for surely transmitting the stress of one beam member to the other beam members orthogonal to the column member by bolt joining in response to the labor environment where welding technicians are reduced, It is possible to reduce the welding work on site. Further, the rib material improves the cross-sectional performance at the beam end, and at the same time, the plastic hinge of the beam member is moved to a position avoiding to the center of the span from the bolt joint of the joint plate, whereby the bolt joint of the joint plate It suppresses an increase in stress such as a bending moment in the joint portion, and suppresses bolt slippage in the bolt joint portion of the joint plate.

According to a second characteristic configuration of the present invention, the pair of rib members divides a web of rib material made of H-shaped steel into two at a cutting position where beam ends of beam members of the pair of beam members become equal to each other, and a cross section T It is in the point that it is structured.

According to the above configuration, since a pair of rib members having T-shaped cross sections having different heights can be manufactured by dividing a web of rib material made of H-shaped steel into two parts, the manufacturing cost can be reduced. it can.

Horizontal sectional view showing the column-beam joint structure of the present invention Exploded perspective view of the column-beam joint structure of the present invention A developed side view taken along line III-III in FIG. Sectional view (a) of the rib material which comprises a pair of rib material, bb sectional view (b) of FIG. 3, cc sectional view (c) of FIG.

An embodiment of the present invention will be described with reference to the drawings.
1 to 3 show that the beam end portion of the beam member 3 made of H-shaped steel is bolted to the bracket member 2 provided at the joint portion on each of the four orthogonal column surfaces 1a of the column member 1 made of rectangular steel pipe. The column-beam connection structure is shown.
As shown in FIG. 2, each of the four bracket members 2 includes a web 21A extending in the vertical direction, and a pair of upper and lower portions extending from both upper and lower ends of the web 21A in the horizontal direction on both sides (width direction). The flanges 21B and 21C are made of H-shaped steel of the same shape. Each bracket member 2 is configured as a short bracket whose projecting length from the pillar surface 1a is shorter than the width of the flanges 21B and 21C, and is joined to the pillar surface 1a by fillet welding.
As shown in FIGS. 1 to 3, the four bracket members 2 include a first bracket member 2A that is abutted against an end surface of a beam end portion 3a of a first beam member 3A described later, and a second beam member 3B described later. It is divided into a second bracket member 2B that abuts the end surface of the beam end portion 3b.

There are two types of beam members 3 with different beam formation on the center side of the span. In the present embodiment, as shown in FIGS. 2 and 3, the first beam member 3A including the first H-section steel 31 having a large beam formation H1a is used in one Y direction that is orthogonal to the other orthogonal direction. In the X direction, the second beam member 3B including the second H-section steel 32 having a small beam formation H2a is used.
As shown in FIG. 3, beam formation on the span center side of the first beam member 3A (beam formation H1a of the first H-section steel 31) and beam formation on the span center side of the second beam member 3B (second H-section steel). Each of the 32 beam formations H2a) is configured to be smaller than the bracket height H of the bracket member 2. Each of the first beam formation H1 of the beam end 3a of the first beam member 3A and the second beam formation H2 of the beam end 3b of the second beam member 3B is configured to be the same as the bracket height H of the bracket member 2. ing.

As shown in FIGS. 2 to 4, of the upper and lower flanges 31B and 31C of the first H-section steel 31 of the first beam member 3A, the lower flange 31C is located at the center position in the width direction of the beam end 3a side. Is the fillet welding of the first rib material 4 made of steel with a T-shaped cross section adjusted to a rib height H1b corresponding to the difference between the bracket height H of the bracket member 2 and the beam formation H1a of the first H-section steel 31. Are joined together. Therefore, the first beam formation H1 of the beam end 3a of the first beam member 3A is the sum of the beam formation H1a of the first H-section steel 31 and the rib height H1b of the first rib member 4.

As shown in FIGS. 2 and 3, the first rib member 4 is formed in the same cross-sectional shape over the entire length in the span direction, and the beam end portion 3a of the first beam member 3A is configured as a drop haunch. With this drop haunch, the cross-sectional performance at the beam end portion 3a of the first beam member 3A that bears a large stress such as a bending moment can be improved.
At the end of the first rib member 4 on the center side of the span, as shown in FIGS. 2 and 3, the lower surface of the lower flange 31C of the first H-section steel 31, the web 4A of the first rib member 4 and the flange 4B. The first reinforcing plate 4C that is in contact with is welded. A third reinforcing plate 31D that is in contact with the web 31A of the first H-shaped steel 31 and the upper and lower flanges 31B and 31C is welded to an intermediate portion of the first H-shaped steel 31 corresponding to the first reinforcing plate 4C. ..

As shown in FIG. 2 and FIG. 4, among the upper and lower flanges 32B and 32C of the second H-section steel 32 of the second beam member 3B, at the center position in the width direction of the lower end of the lower flange 32C on the beam end 3b side. Is the fillet welding of the second rib material 5 made of steel and having a T-shaped cross section adjusted to the rib height H2b corresponding to the difference between the bracket height H of the bracket member 2 and the beam formation H2a of the second H-shaped steel 32. Are joined together. Therefore, the second beam formation H2 of the beam end 3b of the second beam member 3B is the sum of the beam formation H2a of the second H-section steel 32 and the rib height H2b of the second rib member 5.

As shown in FIGS. 2 and 3, the second rib member 5 is formed in the same cross-sectional shape over the entire length in the span direction, and the beam end portion 3b of the second beam member 3B is configured as a drop haunch. With this drop haunch, the cross-sectional performance at the beam end 3b of the second beam member 3B that bears a large stress such as a bending moment can be improved.
As shown in FIGS. 2 and 3, the lower end of the flange 32C on the lower side of the second H-shaped steel 32, the web 5A and the flange 5B of the second rib member 5 are provided at the end of the second rib member 5 on the center side of the span. The second reinforcing plate 5C that is in contact with is welded. A fourth reinforcing plate 32D, which comes into contact with the web 32A of the second H-shaped steel 32 and the upper and lower flanges 32B and 32C, is welded to an intermediate portion of the second H-shaped steel 32 corresponding to the second reinforcing plate 5C. ..

Next, the bolts of the web 21A of the bracket member 2 and the webs 31A and 4A of the first beam member 3A and the webs 32A and 5A of the second beam member 3B, which are welded to the joints of the respective column surfaces 1a of the column member 1, are welded. The joint structure will be described.
As shown in FIG. 2, a plurality of first bolts are provided on each of the connecting end portion of the web 31A of the first H-section steel 31 and the connecting end portion of the web 4A of the first rib member 4 which form the first beam member 3A. The insertion hole 11 is formed so as to penetrate therethrough. A plurality of second bolt insertion holes 12 are penetratingly formed in each of the connecting end portion of the web 32A of the second H-section steel 32 and the connecting end portion of the web 5A of the second rib member 5 which form the second beam member 3B. ing.
As shown in FIG. 2, in the web 21A of the first bracket member 2A that abuts the end surface of the beam end portion 3a of the first beam member 3A, the first bolt insertion hole 11 and the first bolt insertion hole 11 on the first H-section steel 31 side and the first A third bolt insertion hole 13 is formed at a position corresponding to the first bolt insertion hole 11 on the rib member 4 side. Further, the web 25A of the second bracket member 2B that is abutted with the end surface of the beam end portion 3b of the second beam member 3B has the second bolt insertion hole 12 on the second H-section steel 32 side and the second rib member 5 side. A fourth bolt insertion hole 14 is formed at a position corresponding to the second bolt insertion hole 12.

As shown in FIG. 2, the pair of first web joining plates 6 for bolt-connecting the web 31A of the first H-section steel 31 of the first beam member 3A and the web 21A of the first bracket member 2A in a clamped state, A fifth bolt insertion hole 15 is formed at a position corresponding to the first bolt insertion hole 11 on the first H-section steel 31 side and the third bolt insertion hole 13 on the first bracket member 2A side.
The pair of web second joint plates 7 that bolt-connect the web 4A of the first rib member 4 of the first beam member 3A and the web 21A of the first bracket member 2A in a sandwiched state are provided on the first rib member 4 side. A sixth bolt insertion hole 16 is formed at a position corresponding to the first bolt insertion hole 11 and the third bolt insertion hole 13 on the first bracket member 2A side.

As shown in FIG. 2 and FIG. 3, the pair of third joining plates 8 for webs for bolt-connecting the web 32A of the second H-section steel 32 of the second beam member 3B and the web 21A of the second bracket member 2B in a sandwiched state. A seventh bolt insertion hole 17 is formed at a position corresponding to the second bolt insertion hole 12 on the second H-section steel 32 side and the fourth bolt insertion hole 14 on the second bracket member 2B side.
The pair of web fourth joining plates 9 for bolt-connecting the web 5A of the second rib member 5 of the second beam member 3B and the web 21A of the second bracket member 2B in a sandwiched state are provided on the second rib member 5 side. Eighth bolt insertion holes 18 are formed at positions corresponding to the second bolt insertion holes 12 and the fourth bolt insertion holes 14 on the second bracket member 2B side.

Then, as shown in FIGS. 2 and 3, the web 21A of the first bracket member 2A, the web 31A of the first H-section steel 31 of the first beam member 3A and the web 4A of the first rib member 4 in the butted state. Are clamped by a pair of web first joint plates 6 and a pair of web second joint plates 7 on both side surfaces thereof, and are bolted by a bolt/nut 10 fastening operation.
Further, as shown in FIGS. 2 and 3, the web 21A of the second bracket member 2B in the abutting state, the web 32A of the second H-section steel 32 of the second beam member 3B, and the web 5A of the second rib member 5 are provided. Are clamped by a bolt/nut 10 in a sandwiched state in which a pair of third web-bonding plates 8 and a pair of fourth web-bonding plates 9 are arranged on both side surfaces thereof.

As shown in FIG. 3, each of the first beam component H1 of the beam end portion 3a of the first beam member 3A and the second beam component H2 of the beam end portion 3b of the second beam member 3B includes the first bracket member 2A and the second beam component H2. Since the bracket heights H of the second bracket member 2B are set equal to each other, the web 21A of the first bracket member 2A and the webs 31A and 4A of the first beam member 3A side, and the web 21A of the second bracket member 2B. And the webs 32A, 5A on the side of the second beam member 3B are bolted to each other, the upper and lower flanges 21B, 21C of the pair of bracket members 2A, 2B adjacent to each other in the outer peripheral direction of the pillar member 1 and the pair of The height levels of the upper flanges 31B and 32B and the lower flanges 4B and 5B of the beam ends 3a and 3b of the beam members 3A and 3B match.

As shown in FIGS. 1 to 3, the upper flanges 21B and 21B of the adjacent bracket members 2A and 2B having the same height level and the beam end portions 3a and 3b of the adjacent beam members 3A and 3B. The upper flanges 31B and 32B are bolted in a sandwiched state by a pair of upper and lower flange joint plates 40 and 40. Similarly, the lower flanges 4B and 4B of the adjacent bracket members 2A and 2B having the same height level and the lower flanges 4B and 4B of the beam end portions 3a and 3b of the adjacent beam members 3A and 3B. 4B is bolted in a sandwiched state by a pair of upper and lower flange joint plates 40, 40.

Next, the bolt joint structure using the flange joint plate 40 will be described.
As shown in FIG. 2, a plurality of ninth bolt insertion holes 41 are formed through each of the upper and lower flanges 21B and 21C of the first bracket member 2A and the upper and lower flanges 21B and 21C of the second bracket member 2B. ing. A plurality of tenth bolts are inserted into each of the connecting end portion of the upper flange 31B of the first H-section steel 31 and the connecting end portion of the lower flange 4B of the first rib member 4 constituting the first beam member 3A. The hole 42 is formed so as to penetrate therethrough. A plurality of eleventh bolts are inserted into each of the connecting end portion of the upper flange 32B of the second H-shaped steel 32 and the connecting end portion of the lower flange 5B of the second rib member 5 which form the second beam member 3B. The hole 43 is formed so as to penetrate therethrough.

As shown in FIG. 2, a recess 40a into which one corner 1b of the pillar member 1 is inserted is formed in the center of the flange joint plate 40. As shown in FIG. 2, the two orthogonal side portions 40b and 40c of the flange joint plate 40 defined by the recess 40a are located above the adjacent bracket members 2A and 2B having the same height level. The flanges 21B and 21B and the upper flanges 31B and 32B of the beam ends 3a and 3b of the adjacent beam members 3A and 3B, respectively, and the adjacent two whose height levels are the same. Selectable between the lower flanges 21C and 21C of the bracket members 2A and 2B and the lower flanges 4B and 5B of the beam ends 3a and 3b of the adjacent beam members 3A and 3B. It is configured to be usable.
As shown in FIG. 2, on the side portions 40b and 40c of the flange joint plate 40, the ninth bolt insertion holes 41 on the flange side of the adjacent bracket members 2A and 2B, and the adjacent beam members 3A, A twelfth bolt insertion hole 44 corresponding to the tenth bolt insertion hole 42 and the eleventh bolt insertion hole 43 on the flange side of 3B is formed.

As shown in FIGS. 1 to 3, the upper flanges 21B and 21B of the adjacent bracket members 2A and 2B having the same height level and the beam end portions 3a and 3b of the adjacent beam members 3A and 3B. The upper flanges 31B and 32B are bolted to each other by a fastening operation with the bolts and nuts 45 in a sandwiched state in which a pair of flange joint plates 40 and 40 are arranged on both upper and lower surfaces thereof.
Similarly, the lower flanges 21C and 21C of the adjacent bracket members 2A and 2B having the same height level and the lower flanges 4B of the beam end portions 3a and 3b of the adjacent beam members 3A and 3B, respectively. 5B is a pinched state in which a pair of flange joint plates 40, 40 are arranged on both upper and lower surfaces thereof, and is bolted by a bolt/nut 45 fastening operation.
Then, the joints of the side portions 40b and 40c of the flange joint plate 40 by the plurality of bolts and nuts 45 described above become the bolt joints 46.

As shown in FIGS. 2 and 3, the total length in the span direction of the first rib member 4 of the first beam member 3A and the total length in the span direction of the first rib member 4 of the second beam member 3B are the flange joints. It is configured to be sufficiently longer than the length in the span direction of the side portions 40b and 40c of the plate 40. As a result, the end of the first rib member 4 on the center side of the span and the end of the second rib member 5 on the center side of the span extend farther toward the center of the span than the side portions 40b and 40c of the flange joint plate 40. The plastic hinge h1 of the first beam member 3A and the plastic hinge h2 of the second beam member 3B are provided by the drop haunch of the first rib member 4 and the second rib member 5 from the bolt joint portion 46 of the flange joint plate 40. Has also been moved to the avoided position on the center of the span.
As a result, it is possible to suppress an increase in stress such as a bending moment at the bolt joint portion 46 of the flange joint plate 40 and to suppress bolt slippage at the bolt joint portion 46 of the flange joint plate 40.

As shown in FIG. 4, the first rib member 4 and the second rib member 5 are the first beam component H1 of the beam end portion 3a of the first beam member 3A and the second rib member 3b of the second beam member 3B. The web 50A of the rib material 50 made of H-shaped steel is divided into two at a cutting position P where the beam formations H2 are equal to each other, and the web 50A is formed into a T-shaped cross section.
With the above configuration, the first rib member 4 and the second rib member 5 having different T-shaped cross sections can be manufactured by dividing the web 50A of the rib material 50 made of H-shaped steel into two parts. Cost reduction can be achieved.

[Other Embodiments]
(1) In the above-described embodiment, the first rib material 4 and the second rib material 5 are configured to have a T-shaped cross section, but may be configured to have an H-shaped cross section or the like.

(2) In the above-described embodiment, the bracket member 2 provided in the joint portion on each of the four orthogonal pillar surfaces 1a of the pillar member 1 is made of H-shaped steel. It suffices that the pillar surface 1 a of the member 1 can be fillet welded and can be bolted to the beam end of the beam member 3.

1 pillar member 1a pillar surface 2 bracket member 3 beam member 3a beam end portion 3b beam end portion 4 rib material (first rib material)
4B Lower flange 5 Rib material (second rib material)
5B Lower flange 31B Upper flange 32B Upper flange 40 Flange joint plate 46 Bolt joint 50 Rib material 50A Web H1 First beam formation H2 Second beam formation

Claims (2)

The beam end of a beam member made of H-shaped steel with a different beam formation at the span center side is bolted to a bracket member provided at the joint portion on the orthogonal column surface of the steel pipe column member. And
Each of the beam ends of the pair of beam members is configured as a drop haunch that is formed by welding a height-adjusted rib material having a flange on the lower side to a lower surface of the beam member. The beam configurations of the end portions are set to be equal, and the pair of bracket members adjacent to each other in the outer peripheral direction of the column member and the upper and lower flanges at the beam end portions of the pair of beam members are bolt-joined with a joining plate, The beam-column joint structure in which the plastic hinge of the member is moved to a position avoiding to the span center side from the bolt joint portion of the joint plate by the drop haunch by the rib material. 2. The pair of rib members are configured to have a T-shaped cross section by dividing the web of rib material made of H-shaped steel into two at a cutting position where the beam ends of the pair of beam members are equal in beam formation. The column-beam connection structure described.

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