JP2021188484A - Steel frame structure - Google Patents

Abstract

To improve workability while reassuring a function of a horizontal brace by devising a structure of the horizontal brace.SOLUTION: In a steel frame structure having a plurality of first steel frame beams 4, 5 constituting a first structure plane 3 and a plurality of steel frame beams 7-9 dividing the first structure plane 3 into a plurality of second structure planes 6, a first horizontal brace 31 having a long construction span for enhancing an in-plane rigidity of the first structure plane 3 and a second horizontal brace 32 having a short construction span for enhancing the in-plane rigidity of the second structure plane 6 are provided with different arrangement heights at the upper side and the lower side of the first steel frame beams 4, 5.SELECTED DRAWING: Figure 1

Description

The present invention relates to a steel-framed building including a plurality of first steel beams constituting the first structure and a plurality of second steel beams for dividing the first structure into a plurality of second structures.

The steel-framed building as described above includes, for example, six truss beams (first steel beam) extending in the X direction as steel beams constituting the roof as a rectangular roof structure in a plan view covering a large space. , Four truss beams extending in the Y direction (first steel beam), first beam extending in the Y direction (second steel beam) erected between the truss beams, and beam to beam or beam A second beam (second steel beam) erected between the beam and the truss beam is provided, and a horizontal brace is erected on a plane surrounded by these truss beams and the beam (for example, a patent). See Document 1).

Japanese Unexamined Patent Publication No. 2018-35556

In the configuration described in Patent Document 1 above, the in-plane rigidity of each plane can be increased by installing horizontal braces on each of the planes surrounded by the truss beam and the beam, whereby the in-plane rigidity of each plane can be increased. The in-plane rigidity of the plane surrounded by the truss beams can also be increased.
However, in the configuration described in Patent Document 1, it is necessary to install horizontal braces on each of the planes surrounded by the truss beam and the beam. Therefore, as the number of horizontal braces increases, the number of joints between the beam side and the horizontal braces increases, and therefore there is room for improvement in improving workability.

Further, as a configuration different from the configuration described in Patent Document 1, for example, in order to increase the in-plane rigidity of the plane surrounded by the girders, a pair of horizontal braces having a long erection span between the joints of the girders. It is conceivable to prepare. However, in this configuration, when each horizontal brace is used for lateral stiffening of each girder, each horizontal brace is divided at the position of the girder for lateral stiffening, and each divided end is on the girder side. It takes time and effort to join the provided gusset plate with multiple bolts. Therefore, even in this configuration, there is room for improvement in improving workability.

In view of this situation, the main problem of the present invention is to improve the workability while ensuring the function of the horizontal brace by devising the configuration of the horizontal brace.

The first characteristic configuration of the present invention is a steel frame including a plurality of first steel frame beams constituting the first structural surface and a plurality of second steel frame beams for dividing the first structural surface into a plurality of second structural surfaces. It ’s a building,
The first horizontal brace having a long erection span that enhances the in-plane rigidity of the first structure surface and the second horizontal brace having a short erection span that enhances the in-plane rigidity of the second structure surface are formed on the upper part of the first steel frame beam. The point is that the side and the lower side are provided with different arrangement heights.

According to the present invention, for example, by utilizing the difference in beam formation between the first steel frame beam and the second steel frame beam, the arrangement heights of the first horizontal brace and the second horizontal brace can be made different. The first horizontal brace and the second horizontal brace having different functions can be provided in the plane of the first structure without interfering with each other. Further, in the first horizontal brace, the number of places that need to be divided at the position of the second steel frame beam can be reduced, so that the number of steel materials constituting the first horizontal brace can be reduced and the first. It is possible to reduce the number of joints with the second steel beam in the horizontal brace.
Moreover, by providing the first horizontal brace that enhances the in-plane rigidity of the first structural surface, it is not necessary to provide the second horizontal brace on each of the second structural surfaces, and therefore the number of equipment of the second horizontal brace is reduced. It is possible to reduce the number of joints between the second horizontal brace and the steel beam.
In other words, by providing the first horizontal brace and the second horizontal brace with different functions at different placement heights, it is possible to improve workability by simplifying the configuration while ensuring the functions of each horizontal brace. can.

The second characteristic configuration of the present invention is
The first steel beam is a girder extending between steel columns, the second steel beam includes a small beam that functions as a lateral stiffener of the girder, and the first horizontal brace is for horizontal force transmission. The second horizontal brace is a brace for lateral stiffening provided on a predetermined second structural surface including the girder on one side of the plurality of the second structural surfaces.

According to the present invention, the first horizontal brace that functions for horizontal force transmission and the second horizontal brace that functions for lateral stiffening are the first structural surface by utilizing the difference in beam formation between the girder and the girder. Can be prepared without interfering with each other in the plane of.
When a horizontal force is generated due to an earthquake or a typhoon, the horizontal force can be satisfactorily transmitted from the first horizontal brace to a girder or a column. This eliminates the need to equip each of the second structural surfaces with horizontal braces for horizontal force transmission, so that the number of horizontal braces equipped can be reduced and the number of joints between the horizontal braces and the steel beam can be reduced. Can be done.
Further, since the rigidity of the girder against lateral buckling is increased by the second horizontal brace, the first horizontal brace is used for the lateral stiffening as in the case where the first horizontal brace is also used for the lateral stiffening. There is no need to divide at the position and join to each beam. Therefore, the number of steel materials constituting the first horizontal brace can be reduced, and the number of joints with the beam in the first horizontal brace can be reduced.
Moreover, since the second horizontal brace is for lateral stiffening with a short erection span, a turnbuckle that requires a small number of bolts for joining and a small size of the gusset plate can be used as the second horizontal brace.
As a result, the first horizontal brace for horizontal force transmission and the second horizontal brace for lateral stiffening are provided at different heights, thereby ensuring the function of each horizontal brace and simplifying the configuration. It is possible to improve workability more effectively.

The third characteristic configuration of the present invention is
The first steel beam is a girder extending between steel columns, and the second steel beam includes a beam that supports a floor material or a roofing material, and the beam includes the beam together with the second horizontal brace. It is located at the height of the upper part of the girder.

According to the present invention, since the girder is provided at a height position on the upper side of the girder suitable for supporting the flooring material or the roofing material together with the girder, the flooring material or the roofing material can be supported by a complicated structure. It is possible to support the girder and the girder with good stability without causing the change. Then, while obtaining such a support structure, the first horizontal brace and the second horizontal brace having different functions are placed in the plane of the first structural surface by utilizing the difference in beam formation between the girder and the girder. It can be prepared without interfering with each other.
As a result, it is possible to improve the workability by simplifying the configuration while ensuring the function of each horizontal brace without disturbing the support structure of the floor material or the roof material.

Beam plan showing the composition of the roof structure in a steel-framed building Enlarged horizontal cross section of the main part at the lower flange level of the girder showing the configuration of the first horizontal brace, etc. Enlarged beam plan at the upper flange level of the girder showing the configuration of the second horizontal brace, etc. Vertical cross-sectional view of the vicinity of the column-beam joint showing the height positions of the first horizontal brace and the second horizontal brace. Schematic beam plan at the upper flange level of the girder showing the location of the second horizontal brace in another embodiment.

Hereinafter, as an example of an embodiment for carrying out the present invention, an embodiment in which the present invention is applied to a roof structure (an example of a column-beam frame) of a steel-framed building will be described with reference to the drawings.
The present invention can be applied not only to the roof structure of a steel-framed building but also to the floor structure of a steel-framed building.

FIG. 1 shows a part of the roof assembly 1 in the steel-framed building, and the roof assembly 1 of the steel-framed building exemplified in the present embodiment is predetermined in the X direction and the Y direction orthogonal to each other in a plan view. A plurality of steel frame columns 2 built with a span (distance between column cores), a plurality of first steel beam beams 4 and 5 constituting a plurality of rectangular first structure surfaces 3, and each first structure. A plurality of second steel frame beams 7 to 9 for dividing the surface 3 into a plurality of rectangular second structure surfaces 6 and a plurality of third steel frame beams 11 to 13 constituting an overhanging portion 10 overhanging in the X direction are provided. Has been done.

As shown in FIGS. 1 to 4, the plurality of first steel frame beams 4 and 5 include a plurality of first girders 4 extending between the steel frame columns 2 in the X direction and a plurality of second girders extending between the steel frame columns 2 in the Y direction. 5 and are included. The plurality of second steel beams 7 to 9 include a plurality of first beam beams 7 that bisect each first structure surface 3 in the X direction, and a plurality of first beam beams 7 that bisect each first structure surface 3 in the Y direction. 2nd beam 8 and a plurality of 3rd beams 9 that bisect between the 2nd beam 5 and the 1st beam 7 between the adjacent 1st beam 4 and the 2nd beam 8 It is included. It should be noted that the method and quantity of each of the first structural surfaces 3 by each of the beams 7 to 9 and the number of installations of each of the beams 7 to 9 can be changed in various ways.

The plurality of third steel beams 11 to 13 include a plurality of cantilever beams 11 extending in the Y direction from the steel frame columns 2 arranged at the outer ends in the Y direction or the first girder 4, and adjacent cantilever beams 11. A plurality of fourth beams 12 spanned between the overhanging ends and a plurality of fifth beams 13 that divide the adjacent cantilever 11 into three equal parts are included. The arrangement and number of installations of each cantilever 11 can be variously changed according to the arrangement and number of installations of each second girder 5 and each first beam 7. Further, the arrangement and the number of installations of each of the fifth beams 13 can be variously changed according to the arrangement and the number of installations of each third beam 9.

Each first structure surface 3 is provided with a pair of first horizontal braces 31 arranged at the lower flange level of each girder 4, 5. A predetermined second structural surface 6A of the plurality of second structural surfaces 6 is provided with a pair of second horizontal braces 32 arranged at the upper flange level of each girder 4, 5. As a result, in the plane of each first structural surface 3, the first horizontal brace 31 and the second horizontal brace 32 are arranged at different heights on the upper side and the lower side of the girders 4 and 5. It is prepared in a state of being.

In the present embodiment, as the predetermined second structural surface 6A provided with the second horizontal brace 32, the first girder 4 is included on one side in the X direction, and the second girder 5 or the second girder is included on one side in the Y direction. Each second structural surface 6 having a configuration including one beam 7 is set.

By the way, since FIG. 2 is an enlarged horizontal cross-sectional view of the main part at the lower flange level of each girder 4 and 5, in FIG. 2, each girder 7 to provided at the upper flange level of each girder 4 and 5 is provided. Of 9 and each second horizontal brace 32, each beam 7 to 9 is indicated by a two-dot chain line (imaginary line), and the illustration of each second horizontal brace 32 is omitted. Further, since FIG. 3 is an enlarged beam plan of the main part at the upper flange level of each girder 4 and 5, in FIG. 3, the first horizontal brace 31 provided at the lower flange level of each girder 4 and 5 is provided. Is omitted.

As shown in FIGS. 1 to 3, each first beam 7 is laid between adjacent first beams 4. Each second beam 8 is laid across the adjacent second beam 5 and the first beam 7. Each third beam 9 is laid across the adjacent first beam 4 and the second beam 8. Each fifth beam 13 is laid across the adjacent first girder 4 and fourth beam 12.

As shown in FIGS. 2 to 4, a square steel pipe is adopted for each steel frame column 2. The upper diaphragm 21 and the lower diaphragm 22 are welded to the upper part of each steel frame column 2. For each steel frame column 2, not only a square steel pipe but also a circular steel pipe, an H-shaped steel, a concrete-filled steel pipe (CFT), or the like can be adopted.

H-shaped steel is used for each of the girders 4 and 5. In each of the girders 4 and 5, the beam ends of the upper flanges 4a and 5a are joined to the upper diaphragm 21 of the steel frame column 2. In each of the girders 4 and 5, the beam ends of the lower flanges 4b and 5b are joined to the lower diaphragm 22 of the steel frame column 2. In each of the girders 4 and 5, the beam ends of the webs 4c and 5c are joined to the outer surface of the steel frame column 2. In addition, not only H-shaped steel but also build H steel, truss beam and the like can be adopted for each of the girders 4 and 5.

As shown in FIGS. 1 to 3, H-shaped steel having a larger beam formation than the girders 4 and 5 is used for each first beam 7. In each first beam 7, each beam end thereof is joined to the first beam 4. The height position of the upper flange 7a of each first beam 7 is set to be the same as the height position of the upper flanges 4a, 5a of the girders 4, 5. The first beam 7 is not limited to the above-mentioned H-shaped steel, and H-shaped steel or channel steel having a smaller beam length than the girders 4 and 5 can be used.

For each second beam 8, H-shaped steel having a smaller beam formation than each of the large beams 4 and 5 is adopted. In each second beam 8, one beam end is joined to the second girder 5, and the other beam end is joined to the first beam 7. The height position of the upper flange 8a of each of the second beam 8 is set to be the same as the height position of the upper flanges 4a, 5a of the girders 4, 5. As a result, the installation space for the first horizontal brace 31 is secured below each second beam 8. In addition, not only H-shaped steel but also channel steel, angle steel and the like can be adopted for each second beam 8.

For each third beam 9, H-shaped steel having a smaller beam formation than that of the second beam 8 is adopted. In each third beam 9, one beam end is joined to the first girder 4, and the other beam end is joined to the second beam 8. The height position of the upper flange 9a of each third beam 9 is set to be the same as the height position of the upper flanges 4a, 5a of the girders 4, 5. As a result, the installation space for the first horizontal brace 31 is secured below each third beam 9. In addition, not only H-shaped steel but also channel steel, angle steel and the like can be adopted for each third beam 9.

For each cantilever 11, H-shaped steel having a beam formation equal to or higher than that of each of the girders 4 and 5 is adopted. Each cantilever 11 has one beam end joined to the steel column 2 or the first girder 4. The height position of the upper flange 11a of each cantilever 11 is set to be the same as the height position of the upper flanges 4a, 5a of the girders 4, 5.

For each 4th beam 12, H-shaped steel having a beam structure equivalent to that of each of the large beams 4 and 5 is adopted. In each fourth beam 12, each beam end thereof is joined to the cantilever 11. Each of the fourth beam 12 is set so that the height position of the upper flange 12a thereof is the same as the height position of the upper flanges 4a and 5a of the girders 4 and 5.

For each fifth beam 13, H-shaped steel having a beam structure equivalent to that of the third beam 9 is adopted. In each fifth beam 13, one beam end is joined to the first girder 4, and the other beam end is joined to the fourth beam 12. The height position of the upper flange 13a of each fifth beam 13 is set to be the same as the height position of the upper flanges 4a, 5a of the girders 4, 5. In addition, not only H-shaped steel but also channel steel, angle steel and the like can be adopted for each fifth beam 13.

That is, each of the small beams 7 to 9, 12, 13 and each cantilever 11 can easily support a roofing material (not shown) such as a folded plate or an ALC panel (lightweight cellular concrete building material) together with each of the large beams 4 and 5. In order to secure the installation space of the first horizontal brace 31 below each second beam 8 and each third beam 9, each girder 4 is in a state where the upper end positions thereof are aligned. , 5 is provided at the height position on the upper side. Then, each of the first beam 7 and each third beam 9 functions as a lateral stiffener of each first girder 4, and each second beam 8 serves as a lateral stiffener of each second girder 5. It is installed to function.

As shown in FIGS. 1 and 2, each first horizontal brace 31 is a brace having a long erection span that enhances the in-plane rigidity of each first structure surface 3, and is a column beam finish of each first structure surface 3. It is hung between the mouths 14. As shown in FIGS. 1 and 3 to 4, each second horizontal brace 32 is a brace with a short erection span that increases the in-plane rigidity of each predetermined second structural surface 6A, and each predetermined second horizontal brace 6A. It is hung between the joints 15 of.

As shown in FIGS. 2 and 4, each first horizontal brace 31 is divided into a first brace portion 31A and a second brace portion 31B at the position of the first beam 7. For each of the brace portions 31A and 31B, a so-called two-chome angle steel brace in which the first steel material 33 and the second steel material 34 made of angle steel are arranged back to back is adopted. One end of each first steel 33 and each second steel 34 is bolted to a gusset plate 16 butt welded to the beam end of the lower flange 5b in the second girder 5. The other end of each first steel material 33 and each second steel material 34 is bolted to a gusset plate 17 welded to the lower side of the central portion in the longitudinal direction in the first beam 7.

In this way, each first horizontal brace 31 sets the difference in beam formation between the second girder 5 and the second girder 8 and the third girder 9 at the height position of the lower flange 5b in the second girder 5. It is hung between the column-beam joints 14 of each first structure surface 3 in a state where interference with the second beam 8 and the third beam 9 is avoided by using the beam. Then, each first horizontal brace 31 functions as a brace for horizontal force transmission that transmits the horizontal force to the steel column 2 or the like when a horizontal force is generated due to an earthquake, a typhoon, or the like.

Each first horizontal brace 31 is not limited to a 2-chome angle steel brace, but is a Z-shaped angle steel brace in which one of the 2-chome angle steel is turned upside down, or a 2-chome channel steel brace. It may be a steel brace or the like.

As shown in FIGS. 3 to 4, each second horizontal brace 32 has a length-adjustable turnbuckle. One end of each second horizontal brace 32 is a joint with the beam end of the upper flange 5a of the second girder 5 or the upper flange 7a of the first beam 7 or the second beam 8 adjacent to the beam end. It is bolted to the gusset plate 18 welded to. The other end of each second horizontal brace 32 is bolted to a gusset plate 19 welded to the beam end of the upper flange 9a of the third beam 9.

In this way, each of the second horizontal braces 32 is located at the height position of the upper flanges 5a and 7a in the second girder 5 or the first girder 7, by utilizing the beam formation of the second girder 5. In a state where interference with 31 is avoided, it is hung between the joints 15 of the predetermined second structure 6A among the plurality of second structure 6. Each of the second horizontal braces 32 functions as a brace for lateral stiffening to prevent lateral buckling of the first girder 4.

With the above configuration, in the roof assembly 1 of the steel-framed building exemplified in the present embodiment, each first horizontal brace 31 functioning for horizontal force transmission and each second horizontal brace 32 functioning for lateral stiffening By utilizing the difference in beam formation between the second girder 5, the second girder 8 and the third girder 9, the above can be provided in the plane of each first structural surface 3 without interfering with each other. Further, since it is not necessary to divide each first horizontal brace 31 at the positions of the second beam 8 and the third beam 9, the first steel material 33 and the second steel material 34 constituting each first horizontal brace 31 are formed. It is possible to reduce the number of beams and eliminate the joint points between the second beam 8 and the third beam 9 in each first horizontal brace 31.

When a horizontal force is generated due to an earthquake, a typhoon, or the like, the horizontal force can be satisfactorily transmitted to the steel frame column 2 or the like by each of the first horizontal braces 31. As a result, it is no longer necessary to equip each of the second structural surfaces 6 with the second horizontal brace 32 for horizontal force transmission, so that the number of the second horizontal brace 32 equipped is reduced, and the second horizontal brace 32 and the second horizontal brace 32 are equipped. The number of joints with the girder 5 and the first horizontal beam 7 is also reduced.

Moreover, since each second horizontal brace 32 is for lateral stiffening with a short erection span, as each second horizontal brace 32, the number of bolts for joining is small and the size of each gusset plate 18 and 38 can be small. Buckles can be used.

Moreover, each girder 7-9, 12, 13 and each cantilever 11 supporting the roofing material such as a folded plate or an ALC panel are suitable for supporting the roofing material together with the girders 4 and 5. Since it is provided at the height position on the upper side of 4 and 5, the roofing material can be used for each girder 4, 5 and each girder 7-9, 12, 13, etc. without complicating the support structure. It can be supported with good stability.

Therefore, by providing each first horizontal brace 31 for horizontal force transmission and each second horizontal brace 32 for lateral stiffening at different arrangement heights as described above, the support structure of the roofing material is hindered. It is possible to improve workability by simplifying the configuration while ensuring the functions of the horizontal braces 31 and 32 without coming.

As shown in FIGS. 1 to 3, the first girder 4, the cantilever 11, the fourth girder 12, the fifth girder 13, or the first girder 4, the fourth girder 12, and the fifth girder Each third structure surface 40 composed of 13 has a pair of third horizontal braces 42 having a short erection span between the joint portions 41 of each third structure surface 40 in order to increase their in-plane rigidity. It is prepared. Each third horizontal brace 42 has a length-adjustable turnbuckle.

[Another Embodiment]
Another embodiment of the present invention will be described.
It should be noted that the configurations of the respective different embodiments described below are not limited to being applied independently, but can also be applied in combination with the above-mentioned embodiments and the configurations of other other embodiments.

(1) In the first horizontal brace 31 and the second horizontal brace 32, the first horizontal brace 31 is arranged on the upper side of each of the first steel frame beams 4 and 5 in the plane of each first structural surface 3, and the second is The horizontal brace 32 may be arranged on the lower side of each of the first steel frame beams 4 and 5.

(2) The first horizontal brace 31 includes the first brace portion 31A and the second brace portion 31B when the beam formation of each first beam 7 is smaller than the beam formation of each of the first steel frame beams 4 and 5. The configuration may not be divided into two.

(3) Even if the first horizontal brace 31 is a V-shaped brace that is laid in a V shape between the facing first steel frame beams (first girders) 4 or between the first steel frame beams (second girders) 5. good.

(4) Of the plurality of second structural surfaces 6 provided in the surface of each first structural surface 3, the arrangement setting of the predetermined second structural surface 6A in which the second horizontal brace 32 is installed can be changed in various ways. Is. For example, in the above embodiment, as shown in FIGS. 1 and 3, as a predetermined second structural surface 6A in which each second horizontal brace 32 is installed, a first girder (first steel frame beam) is provided on one side in the X direction. ) 4 is included, and each second structural surface 6 having a configuration including the second girder (first steel frame beam) 5 or the first girder 7 is set on one side in the Y direction. Not limited to this, as shown in FIG. 5, each second structural surface 6A having a configuration including the first girder (first steel frame beam) 4 or the second girder (first steel frame beam) 5 on only one side is a predetermined second structure. The second horizontal brace 32 may be installed on these predetermined second structural surfaces 6A by setting the surface 6A. In this configuration, each second horizontal brace 32 can be suitably used for lateral stiffening of each girder (first steel frame beam) 4, 5.
In addition, in FIG. 5, the first structural surface 3 composed of a pair of first girders (first steel frame beams) 4 and a pair of second girders (first steel frame beams) 5 is a plurality of second small beams. An example is an example in which the 8 is divided into 6 equal parts in the Y direction and the plurality of 3rd beams 9 are divided into 4 equal parts in the X direction.

2 Steel columns 3 1st structural surface 4 1st girder (1st steel beam)
5 2nd girder (1st steel beam)
6 2nd structural surface 6A Predetermined 2nd structural surface 7 1st beam (2nd steel beam)
8 2nd beam (2nd steel beam)
9 3rd beam (2nd steel beam)
31 1st horizontal brace (for horizontal force transmission)
32 Second horizontal brace (for lateral stiffening)

Claims (3)

A steel-framed building including a plurality of first steel beam beams constituting the first structure surface and a plurality of second steel frame beams dividing the first structure surface into a plurality of second structure surfaces.
The first horizontal brace having a long erection span that enhances the in-plane rigidity of the first structure surface and the second horizontal brace having a short erection span that enhances the in-plane rigidity of the second structure surface are formed on the upper part of the first steel frame beam. A steel-framed building with different heights on the side and the lower side. The first steel beam is a girder extending between steel columns, the second steel beam includes a small beam that functions as a lateral stiffener of the girder, and the first horizontal brace is for horizontal force transmission. The second horizontal brace is a brace for lateral stiffening provided on a predetermined second structural surface including the girder on one side of the plurality of the second structural surfaces according to claim 1. The steel-framed building described. The first steel beam is a girder extending between steel columns, and the second steel beam includes a beam that supports a floor material or a roofing material, and the beam includes the beam together with the second horizontal brace. The steel-framed building according to claim 1 or 2, which is provided at a height position on the upper side of a girder.

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