JP7484878B2 - Steel frame structure, how to design steel frame structure - Google Patents

Description

The present invention relates to a steel frame structure, and in particular to a steel frame structure in which a two-way steel frame rigid frame made of steel pipe columns and H-shaped steel beams is placed under a standardized one-way steel frame rigid frame made of H-shaped steel columns and H-shaped steel beams in a beam-through configuration, and a design method for the same.

Standardized steel frame structures, such as steel prefabricated housing, allow for a high degree of freedom in floor plans within their scope, but there are system constraints when it comes to creating large spaces, and mixing other systems can lead to inconsistencies in the fit of modules and exterior walls, making it difficult to realize.

Patent Document 1 shows a one-way steel frame rigid frame structure with through-beams in which the strong axis direction of the H-shaped steel columns and the longitudinal direction of the H-shaped steel beams are arranged parallel to each other and rigidly connected, making the arrangement of columns and beams, which is a design constraint in rigid frame structures, more flexible.

A specific example of this type of one-way steel frame rigid frame structure with through beams is shown in Figures 1 and 2 of Patent Document 2, where the exterior wall is fixed across a lower mounting member 3 fixed to a steel beam H on the lower floor and an upper mounting member 4 fixed to a steel beam H on the floor above, as shown in Patent Document 2. The mounting members ensure a certain clearance between the outer wall end face of the steel beam and the exterior wall (see Figure 4 of Patent Document 2).

One type of building is, for example, a large span on the lower floors of an apartment building, which can be used as a commercial facility such as a shop. Patent Document 3 shows a column that combines H-shaped steel in series to increase the span within the module constraints of Patent Document 2, ensuring the axial force, bending strength and rigidity of the cross section.

Japanese Patent Application Laid-Open No. 3-233039 JP 2001-107488 A JP 2018-123484 A

The objective of this invention is to provide a rational steel frame structure that secures a large space by using a two-way rigid frame structure in the lower part of a standardized one-way rigid frame structure. Therefore, here we have investigated how to align the one-way rigid frame consisting of H-shaped steel columns and H-shaped steel beams in the upper part with the large-span two-way rigid frame in the lower part.

In order to secure a large space in the lower floors, it is necessary to make a large-span two-way rigid frame, so the cross-sectional performance of the columns needs to be large. As shown in Patent Document 3, a column in which H-shaped steel is combined in series to ensure the axial force, bending strength and rigidity of the section is ensured, but since the strength and rigidity in the weak axis direction of the column are not significantly improved, to make a two-way rigid frame, it is necessary to arrange and combine these in the XY direction. Figure 10 shows an example of the layout that was considered for the structure. Here, the distance from the outer surfaces of flanges 12A and 12B shown in Figure 2 of Patent Document 3 to the boundary between 11A and 11B is set as the minimum module D.

In FIG. 10, 1 denotes an H-shaped steel column in which H-shaped steel used as a column of a one-way rigid frame is arranged in series in the strong axis direction, 2A denotes a base plate, and 3 denotes a column-side joining bolt hole provided in the base plate 2A.
The width of the H-shaped steel column 1 must be an integer multiple of the module, which may result in the column dimensions being larger than necessary.
Furthermore, while the cross-sectional performance in the strong axis direction of the H-shaped steel column 1 is greatly improved, the cross-sectional performance in the perpendicular direction (weak axis direction) is not improved to the extent that a large space can be constructed. Therefore, in order to create a two-way rigid frame, it is necessary to use an assembled column in which the H-shaped steel column 1 is also arranged in the perpendicular direction.
However, when arranging these perpendicularly, the base plates of the two columns interfere with each other, so they have to be arranged at a distance D from each other in the perpendicular direction, as shown in Figures 10(a) and 10(b). Therefore, the dimensions of the assembled column become at least 2D x 3D or more, which causes a problem of increasing the finished dimensions of the column.

Therefore, a structure using steel pipe columns and H-shaped steel beams was considered for the large-span two-way rigid frame of the lower story. Hereafter, the one-way rigid frame of the upper story will be called the first steel rigid frame structure, and the large-span two-way rigid frame of the lower story will be called the second steel rigid frame structure.
As shown in FIG. 11, the exterior walls 8 are all made of the exterior wall system used for the standardized first steel frame rigid frame structure 101 shown in Patent Document 2.
11, the exterior wall 8 is structured to be spaced a predetermined distance from the exterior wall end face of the beam flange 7 by exterior wall mounting members 9 arranged on the upper and lower flanges 7A, 7B of the H-shaped steel beam 4 of the first steel frame rigid frame 101. The beam flange 7 is joined with bolts and nuts via exterior wall mounting member mounting bolt holes (not shown) provided in the beam, and the distance from the beam flange end of the exterior wall mounting member mounting bolt hole is the same as the beam side joining bolt hole 5 described later.

In order to increase the span of the second steel frame rigid frame 102 on the lower floor, the cross-sectional dimensions of the H-shaped steel beams 14 are larger than those of the H-shaped steel beams 4 of the first steel frame rigid frame 101 on the upper floor, as shown in FIG.
Therefore, if the column center and beam center of the second steel frame rigid frame 102 are aligned with the module center of the first steel frame rigid frame 101 on the upper floor, the exterior wall lines of the upper and lower floors will not be aligned, as shown in Figure 12.
Furthermore, since the distance from the end of the beam flange to the column surface in the lower layer is different from that in the upper layer, the exterior wall mounting member 9 cannot be used as is, and a new exterior wall mounting member 19 must be additionally manufactured, extending to the outdoor side across the step between the outdoor surface of the steel pipe column 11 and the outdoor end face of the beam flange of the H-shaped steel beam 14.

In order to align the exterior wall lines under these conditions as shown in Fig. 13, it is necessary to manufacture the exterior wall mounting member 9a for the upper layer. Note that the exterior wall mounting member 9a can be planned in common with the exterior wall mounting member 19 for the lower layer.
Therefore, an attempt was made to align the exterior wall lines of the upper and lower stories by eccentrically aligning the exterior wall end face of the beam flange 17 of the H-shaped steel beam 14 of the second steel frame rigid frame 102 with the surface of the exterior wall 8 of the steel pipe column 11. However, unless the flange widths of the H-shaped steel beam 4 of the upper story and the H-shaped steel beam 14 of the lower story are the same, the distances from the beam flange ends of the bolt holes for attaching the exterior wall mounting members will be different, and therefore it is not possible to align the exterior wall lines of the upper and lower stories by sharing the exterior wall mounting member 9 with the upper story. As a result, as shown in Figure 14, the exterior wall 8 of the upper story is extended to the exterior wall line of the lower story, and ultimately a new exterior wall mounting member 9b with a large protrusion is required separately.

In addition, in the method of Fig. 13 and Fig. 14, the exterior wall 8 of the upper layer is moved to the outdoor side, so the H-shaped steel column 1 and the exterior wall 8 are farther apart than in the normal arrangement shown in Fig. 15(a) or Fig. 15(b). If the interior material 20 is placed based on the indoor side of the H-shaped steel column 1 as in the past, as shown in Fig. 16(a), the wall thickness will be thicker, which will cause problems with the construction of building fixtures. If the wall thickness is to be the same as in Fig. 15(a) to Fig. 15(b), it will be necessary to change the installation position of the interior material 20 together with the base material and move it closer to the outdoor side as shown in Fig. 16(b), and a problem will arise in which the column type will protrude significantly to the indoor side.

Furthermore, in order to align the exterior wall lines by sharing the exterior wall mounting member 9 between the upper and lower layers, we considered simply aligning the positions of the exterior wall end faces of the beam flanges 7, 17 of the H-shaped steel beams 4, 14 on the upper and lower layers. In this case, although not shown, the beam centers of the upper and lower layers are misaligned, and in many cases the position of the column side fixing bolt hole 3 interferes with the web of the H-shaped steel beam 14, making it impossible to drill the beam side connecting bolt hole 15. This makes it impossible to attach the H-shaped steel column 1 to the H-shaped steel beam 14.

Furthermore, when the floor plan is a staggered plan, simply eccentrically distributing the beams to align the exterior wall lines of one of a pair of inside corners can lead to a problem that the exterior wall lines of the other inside corner will not be aligned. Figure 17 shows an example of a staggered plan with a pair of inside corners. X1 indicates the beam center position in the X direction of the first steel frame rigid frame 101 required to align the exterior wall lines of one inside corner Z1, and X2 indicates the beam center position of the first steel frame rigid frame 101 required to align the exterior wall lines of the other inside corner Z2. Here, X1 and X2 cannot be arranged on a straight line. If X1 and X2 do not match, the beam center of the first steel frame rigid frame on the upper floor will not pass through, and the system will not work. If X1 is given priority, the position of the H-shaped steel beam 14 on the Z2 side will be inappropriate.

The present invention aims to solve these problems and provide a steel frame structure and a design method for a steel frame structure that can determine the component settings and arrangement rules for the lower layer by utilizing the modules of the standardized upper layer, one-way beam-through rigid frame structure made of H-shaped steel columns and H-shaped steel beams, and realize the construction of a large space in the lower layer with almost no change to the standardized design rules and components for the upper layer.

(1) The steel frame structure according to the present invention has a first steel frame rigid frame structure of a one-way rigid frame constructed by aligning the flange core or web core of an H-shaped steel column with the web core of an H-shaped steel beam as an upper layer, and a second steel frame rigid frame structure of a two-way rigid frame constructed of a rectangular cross-section steel pipe column and an H-shaped steel beam as a lower layer,
The H-shaped steel beam constituting the second steel frame structure of the lower floor has a flange width that is at least twice the beam flange width of the first steel frame structure of the upper floor,
The H-shaped steel beams of the second steel frame rigid frame structure that face the exterior wall are fixed to the steel pipe column with the exterior wall side end face of the beam flange approximately aligned with the extension line of the exterior wall side face of the steel pipe column, and the beam core of the first steel frame rigid frame structure is aligned with a position 1/2 the beam flange width of the H-shaped steel beam of the first steel frame rigid frame structure from the outdoor side of the flange.

(2) Furthermore, in the above (1), the beam flange width of the H-shaped steel beam constituting the second steel frame rigid frame and the outer diameter dimension of the steel pipe column are the same nominal dimension.

(3) In the above-mentioned (1) or (2), the plan view is a staggered view in which a pair of recessed corners are arranged on the same axis in the X-direction or Y-direction,
With respect to a steel pipe column of one of the inside corner parts, the width dimension of at least a surface facing the steel pipe column of the other inside corner part and a surface opposite thereto is set to 1.5 times or more the beam flange width constituting the second steel frame rigid frame,
A member axis line is located at 1/2 of the beam flange width of the first steel frame moment frame from the outer wall side of the H-shaped steel beam flange extending from the steel pipe column of the one inside corner portion to the steel pipe column of the other inside corner portion;
The present invention is characterized in that the material axis line located at 1/2 of the beam flange width of the first steel frame rigid frame is aligned from the outer wall side of the flange of the H-shaped steel beam extending from the steel pipe column of the other inside corner portion to the opposite side to the steel pipe column of the one inside corner portion.

(4) The design method of the steel frame structure according to the present invention is a design method in which a first steel frame rigid frame structure is an upper layer of a one-way rigid frame constructed by aligning the flange core or web core of an H-shaped steel column with the web core of an H-shaped steel beam, and a second steel frame rigid frame structure is a two-way rigid frame constructed of a steel pipe column with a rectangular cross section and an H-shaped steel beam,
The flange width of the H-shaped steel beam constituting the second steel frame structure of the lower floor is set to be at least twice the beam flange width of the first steel frame structure of the upper floor,
The H-shaped steel beams of the second steel frame rigid frame structure that face the exterior wall are fixed to the steel pipe column by roughly aligning the exterior wall end face of the beam flange on the extension line of the exterior wall face of the steel pipe column, and are characterized in that the beam core of the first steel frame rigid frame structure is aligned at a position 1/2 the beam flange width of the H-shaped steel beam of the first steel frame rigid frame structure from the outdoor side of the flange.

(5) In the above (4), the plan view is a staggered view in which a pair of recessed corners are arranged on the same axis in the X-direction or Y-direction,
With respect to a steel pipe column of one of the inside corner parts, the width dimension of at least a surface facing the steel pipe column of the other inside corner part and a surface opposite thereto is set to 1.5 times or more the beam flange width constituting the second steel frame rigid frame,
A member axis line is located at 1/2 of the beam flange width of the first steel frame moment frame from the outer wall side of the H-shaped steel beam flange extending from the steel pipe column of the one inside corner portion to the steel pipe column of the other inside corner portion;
The present invention is characterized in that the material axis line located at 1/2 of the beam flange width of the first steel frame rigid frame is aligned from the outer wall side of the flange of the H-shaped steel beam extending from the steel pipe column of the other inside corner portion to the opposite side to the steel pipe column of the one inside corner portion.

In the present invention, the first steel frame rigid frame structure is constructed by aligning the web core of the H-shaped steel beam with the flange core or web core of the H-shaped steel column, whereas the H-shaped steel beams constituting the second steel frame rigid frame structure composed of steel pipe columns and H-shaped steel beams in the lower story have a flange width at least twice the width of the beam flange of the first steel frame rigid frame in the upper story. In particular, the beams of the second steel frame rigid frame structure that face the exterior wall are arranged on the steel pipe columns with the exterior end face of the beam flange approximately aligned with the extension line of the exterior face of the column, and the beam core of the first steel frame rigid frame is aligned at a position 1/2 the beam flange width of the first steel frame rigid frame from the exterior side of the flange, so that the exterior wall lines of the upper and lower floors can be easily aligned without using auxiliary members, and the interior space of the first steel frame rigid frame in the upper story can be made wider.

In addition, even if the floor plan is staggered and a pair of inside corners are arranged on the same axis in the X or Y direction, by making the dimensions of at least the face and opposite side of the steel pipe column of one inside corner that faces the steel pipe column of the other inside corner at least 1.5 times the width of the beam flange that constitutes the second steel frame rigid frame, it is possible to align the material axis located at 1/2 the beam flange width of the first steel frame rigid frame from the outdoor side of the H-shaped steel beam flange that extends from the steel pipe column of one inside corner to the steel pipe column of the other inside corner with the material axis located at 1/2 the beam flange width of the first steel frame rigid frame from the outdoor side of the flange of the H-shaped steel beam that extends from the steel pipe column of the other inside corner to the opposite side of the steel pipe column of the one inside corner. This makes it easy to align the exterior wall lines of the upper and lower floors and also allows for a large interior space for the first steel frame rigid frame.

1 is a schematic cross-sectional view showing the arrangement of outer walls according to first and second embodiments of the present invention. FIG. 1(a) is a horizontal cross-sectional view of a modularized H-shaped steel column in which the flange plate thickness center distance is the module, and FIG. 1(b) is a horizontal cross-sectional view of a modularized H-shaped steel column in which the flange outermost surface distance is the module. FIG. 2 is a horizontal cross-sectional view of an H-shaped steel beam. FIG. 2 is a schematic plan view showing the relationship between the beam center positions of a first steel frame rigid-frame structure and the beams of a second steel frame rigid-frame structure in the first embodiment of the present invention. FIG. 5 is a detailed view of the corner portion (portion A) in FIG. 4 . FIG. 5 is a detailed view of an inside corner portion (portion B) in FIG. 4 . This is a detailed view of part C in Figure 4, showing the situation in which the module core on the side perpendicular to the surface facing the exterior wall is positioned in the center of the column cross section. FIG. 11 is a schematic plan view showing the relationship between the beam core positions of a first steel frame rigid frame structure and the beams of a second steel frame rigid frame structure when the component configuration and module core arrangement rules of embodiment 1 are applied to the staggered plan of the present invention. FIG. 11 is a schematic plan view showing the relationship between the beam center positions of a first steel frame rigid-frame structure and the beams of a second steel frame rigid-frame structure in a staggered plan according to embodiment 2 of the present invention. FIG. 1 is an example of an arrangement in which an H-shaped steel column according to Patent Document 3 is applied to a two-way rigid frame. A vertical cross-sectional view showing the installation status of the outer wall of the first steel frame rigid frame structure. This is a simplified cross-sectional view showing the arrangement of the exterior walls when the lower floors are made of steel pipe columns and large-section H-shaped steel beams, and the column center and beam center of the second steel frame rigid frame are aligned with the module center of the first steel frame rigid frame on the upper floors. This is a schematic cross-sectional view showing the arrangement of exterior walls when the lower floors are made of steel pipe columns and large-section H-shaped steel beams, the column center and beam center of the second steel frame rigid frame are aligned with the module center of the first steel frame rigid frame on the upper floor, and the exterior wall lines of the upper and lower floors are aligned. FIG. 14 is a schematic cross-sectional view of a second steel frame rigid-frame structure in which a beam is eccentric to the side surface of a steel pipe column, in accordance with the embodiment of FIG. 13 . FIG. 13A is a plan view showing the case where all interior materials are arranged on the column interior surface in the first steel frame rigid frame portion in FIG. 11 and FIG. 12 with a constant wall thickness, and FIG. 13B is a plan view showing the case where the interior materials are arranged in a column shape. FIG. 15A is a plan view showing the case where all interior materials are arranged on the column interior surface in the first steel frame rigid frame portion in FIG. 13 to FIG. 14 with a constant wall thickness, and FIG. 15B is a plan view showing the case where the interior materials are arranged in a column shape. FIG. 1 is a schematic plan view showing the relationship between the beam center position of the first steel frame rigid frame structure and the beams of the second steel frame rigid frame structure when the beams of the second steel frame rigid frame structure are simply eccentric toward the exterior wall in a staggered plan in the prior art.

[First embodiment]
As shown in FIG. 1 , the steel frame structure 100 of this embodiment is a steel frame structure 100 in which a first steel frame rigid frame 101 consisting of a one-way rigid frame constructed by aligning the flange core or web core of an H-shaped steel column 1 with the web core of an H-shaped steel beam 4 is arranged as an upper layer, and a second steel frame rigid frame 102 consisting of a two-way rigid frame constructed of steel pipe columns 11 with rectangular cross sections and H-shaped steel beams 14 is arranged as a lower layer.
The details will be explained below.

<First steel frame rigid frame>
The first steel frame rigid frame 101 constituting the upper floor is a one-way rigid frame constructed by aligning the flange core or web core of the H-shaped steel column 1 with the web core of the H-shaped steel beam 4. In other words, the first steel frame rigid frame 101 is a one-way rigid frame of a through-beam type steel frame systemized by rigidly connecting and arranging the H-shaped steel column 1 having a base plate 2A and a top plate 2B so that the strong axis direction is parallel to the longitudinal direction of the H-shaped steel beam 4 on a plane in which a grid is formed by reference lines with the same reference dimension (module) D in both the X and Y directions.
First, the H-shaped steel columns 1 and the H-shaped steel beams 4 constituting the first steel frame rigid frame 101 will be described, and then the first steel frame rigid frame 101 will be described in detail.

<H-shaped steel column>
As shown in Figures 2(a) and (b) , the H-shaped steel column 1 constituting the first steel frame rigid frame 101 has a base plate 2A at the lower end of the H-shaped steel and a top plate 2B (not shown) of the same shape at the upper end.
The flange thickness center distance (Fig. 2(a)) or outermost surface distance (Fig. 2(b)) of the H-shaped steel column 1 is D, and when the flange thickness center line or outermost surface of the base plate 2A and the top plate 2B (not shown) are arranged at the X-direction module center X and the web thickness center line at the Y-direction module center Y, the intersection point o of the XY-direction module center is the centroid of a square S with each side parallel to both module centers XY. In other words, the width of the H-shaped steel column 1 is designed to fit within the module D, and at the intersection point o of the XY module, the bolt holes 3 are equidistant in both the X and Y directions, so the positional relationship of the column-side bolt holes 3 does not change whether they are arranged in the X or Y direction.
In the example shown in FIG. 2, the base plate 2A and the top plate 2B are formed in a dumbbell shape so as to match the outer shape of the H-shaped steel column 1, but they may also be substantially rectangular.

<H-shaped steel beam>
As shown in Figure 3, the H-shaped steel beam 4 constituting the first steel frame rigid frame 101 has a flange width Wf that is equal to or greater than the width of the base plate 2A and top plate 2B of the H-shaped steel column 1, and a group of beam-side connecting bolt holes 5 facing the connecting bolt holes 3 of the base plate 2A and top plate 2B of the H-shaped steel column 1 are arranged at a distance D from each other on the upper flange 7A and lower flange 7B (not shown), and a bolt hole (not shown) for attaching an exterior wall mounting member 9 is provided in the middle at the same beam flange end distance as the beam-side connecting bolt holes 5.

<Details of the first steel frame structure>
The first steel frame rigid frame 101 is a standardized steel frame rigid frame structure with H-shaped steel columns 1 and H-shaped steel beams 4, and because the columns are H-shaped steel, it is a one-way rigid frame in the column strong axis cross-sectional direction. These are appropriately arranged in the XY direction to handle horizontal forces acting on the building, and have the same form as, for example, Patent Document 2.

In the present invention, the first steel frame rigid frame 101 may be single- or multi-layered, and if it is multi-layered, columns are not necessarily required directly below the H-shaped steel columns 1 of the upper floor, nor at the corners. Since the H-shaped steel beams 4 have an upper span limit due to the nature of the system, in order to increase the span of the lower floor, the H-shaped steel columns 1 of the bottom floor of the first steel frame rigid frame 101 are connected to the second steel frame rigid frame 102 described later.
The exterior wall 8 is structured to be positioned on the outdoor side while maintaining a specified dimension by means of an exterior wall mounting member 9 arranged on the beam flange 7, as shown in FIG. 1, for example, but may also be structured to be supported by furring strips.

<Second steel frame rigid frame>
The second steel frame rigid frame 102 constituting the lower floor is a two-way rigid frame constituted by rectangular cross-section steel pipe columns 11 and H-shaped steel beams 14. First, the steel pipe columns 11 and H-shaped steel beams 4 constituting the second steel frame rigid frame 102 will be described, and then the second steel frame rigid frame 102 will be described in detail.

Steel pipe column
The steel pipe columns 11 constituting the second steel frame rigid-frame structure 102 are rectangular steel pipes or welded box-shaped cross sections with an outer diameter of at least D. Upper and lower diaphragms 12A, 12B for transmitting the stress of the beam are arranged at the top of the columns, and H-shaped steel beams 14 (described later) are arranged in two, three, or four directions.
On the upper diaphragm 12A, the intersection point o of the XY axis is the centroid, and bolt holes 13 for connecting to the upper floor columns are arranged at at least two or four corners of the square S defined by the H-shaped steel column 1 (see Figures 5 to 7). The bolt holes 13 are provided with female threads, or nuts are welded in advance to the back surface of the upper diaphragm 12A.

<H-shaped steel beam>
The H-shaped steel beams 14 constituting the second steel frame rigid frame 102 have a larger cross section than the H-shaped steel beams 4 in order to have a larger span than the first steel frame rigid frame 101 on the upper floor.
The flange width of the H-shaped steel beam 14 is at least twice the flange width Wf of the H-shaped steel beam 4 of the first steel frame rigid frame 101 on the upper floor, and it is preferable to align the outer diameter dimension and flange width of the above-mentioned steel pipe column 11.
At least the beam flange 17A has a group of beam side connecting bolt holes 15 arranged at intervals D corresponding to the connecting bolt holes 3 in the base plate 2A of the H-shaped steel column 1 of the upper story (first steel frame rigid frame structure 101).

<Details of the second steel frame structure>
It is a two-way steel frame structure using steel pipe columns 11 and H-shaped steel beams 14, and in order to ensure consistency with the module of the first steel frame rigid frame structure 101 and to align the exterior wall lines of the upper and lower floors, the shape and arrangement method of the steel pipe columns 11 and H-shaped steel beams 14 are determined based on module D of the first steel frame rigid frame structure 101 system.

First, a rectangular or L-shaped structure with one internal corner will be described with reference to Figures 4 to 7. Figures 5, 6, and 7 are detailed views of parts A, B, and C in Figure 4, respectively.
4, the beams 14 arranged on the outer periphery are designated as 14A, the inner beams on the extension of 14A are designated as 14B, and the rest are simply designated as 14. The same applies to FIG.
As shown in Figures 4 to 7, the outer peripheral beams 14A facing the outer wall 8 of the second steel frame rigid frame 102 are positioned so that the outer wall 8 side end faces of the beam flanges 17 are approximately aligned with the extension line of the outer wall side face of the outer peripheral steel pipe columns 11A, and the beam core (module core X, Y) of the first steel frame rigid frame 101 is aligned at a position 1/2 of the width Wf of the beam flange 7 of the first steel frame rigid frame 101 from the outer wall side end faces of the beam flanges 17.

In the protruding corner portion, as shown in Figures 4 and 5, the beam center X or Y of the first steel frame rigid frame 101 is aligned with a position that is 1/2 the beam flange width Wf of the first steel frame rigid frame 101 from the outer wall side end face of the beam flange in the X and Y directions, respectively.
In other words, the module core XY of the steel pipe columns 11A and beams 14A that constitute the outer periphery of the second steel frame rigid frame 102 is located at a position 1/2 of the beam flange width Wf of the first steel frame rigid frame 101 from the surface on the exterior wall 8 side.

When there is an inside corner, as shown in Figures 4 and 6, the same arrangement rules apply to the H-shaped steel beam 14B and steel pipe column 11B that are arranged on the extension line of the H-shaped steel beam 14B that constitutes the inside corner.
In addition, with regard to the module core on the side perpendicular to the surface facing the exterior wall 8 other than the above, the through core may be arranged in the center of the column cross section as shown in Figures 4 and 7 (here, the Y axis).

As described above, according to the steel frame structure 100 of this embodiment, the first steel frame rigid frame 101 is configured by aligning the flange core or web core of the H-shaped steel column 1 with the web core of the H-shaped steel beam 4, while the second steel frame rigid frame 102, which is configured of the steel pipe column 11 and the H-shaped steel beam 14 of the lower story, has a flange width of the H-shaped steel beam 14 that is at least twice the beam flange width of the first steel frame rigid frame 101 of the upper story, and in particular, the beams of the second steel frame rigid frame 102 are arranged so that the flange width of the H-shaped steel beam 14 is at least twice the beam flange width of the first steel frame rigid frame 101 of the upper story. The facing beam is placed on the steel pipe column 11 with the outdoor end face of the beam flange 17 roughly aligned with the extension of the outdoor face of the column, and the beam center of the first steel frame rigid frame 101 is aligned with a position 1/2 the width of the beam flange of the first steel frame rigid frame 101 from the outdoor side of the beam flange 17, so that the exterior wall lines of the upper and lower floors can be easily aligned without using auxiliary components, and the interior space of the first steel frame rigid frame 101 on the upper floor can be made larger.

[Embodiment 2]
In the case of a staggered shape having two inside corners Z1, Z2 on the same module core, according to the member configuration and module core arrangement rules of embodiment 1, when inside corner Z1 is used as the reference, the module cores X1 and X2 of the first steel frame rigid-frame structure 101 do not align at the inside corner Z2 side, as shown in Fig. 8. Therefore, as shown in Fig. 9, with respect to the steel pipe column 11A of one inside corner Z1, the dimensions of at least the faces (left and right faces in the figure) of the steel pipe column 11A' of the other inside corner Z2 facing the inside corners Z1, Z2 are set to 1.5 times or more the width of the beam flange constituting the second steel frame rigid-frame structure 102. The module core located at 1/2 the beam flange width of the first steel frame rigid frame 101 from the outer wall side of the beam flanges 17 of all H-shaped steel beams 14B arranged from the steel pipe column 11A of one inside corner portion Z1 toward the steel pipe column 11A' is aligned with the module core located at 1/2 the beam flange width of the first steel frame rigid frame 101 from the outer wall 8 side of the beam flanges 17 of all H-shaped steel beams 14A' arranged from the other inside corner portion Z2 toward the steel pipe column 11A of the outside corner portion on the extension line of the H-shaped steel beam 14B.

Here, in order to position the surface of the steel pipe column 11A' facing the outer wall 8 side of the H-shaped steel beam 14A' and the end face of the beam flange 17 of the H-shaped steel beam 14A' opposite the outer wall 8 so that they are approximately aligned, the H-shaped steel beams 14A' and 14B are eccentric in a plan view, and the steel pipe column 11A at the corner portion on the extension line of the H-shaped steel beam 14B is also positioned eccentrically from the center line.

According to the steel frame structure 100 of this embodiment, even in the case of staggered construction, the exterior wall lines can be aligned by using the exterior wall mounting members 9 of the first steel frame rigid frame 101 as is, and the interior space of the first steel frame rigid frame 101 can be made spacious.

An embodiment of a steel frame structure 100 according to the present invention is given below.
On a planar grid planned with a minimum module dimension D of 250 mm in both the X and Y directions, H-shaped steel columns 1 made of H-259 x 100 x 6 x 9 (beam depth of H-shaped steel beam [mm] x beam flange width [mm] x web plate thickness [mm] x flange plate thickness [mm]; the same applies below) with base plates 2A and top plates 2B were aligned so that their web cores were parallel to the strong axis direction of the H-shaped steel beams 4 made of H-250 x 125 x 6 x 9, and rigidly joined to create a systemized one-way steel frame with through beams. In order to create a large space by forming a two-way rigid frame on the lower floor of the systemized one-way steel frame, new steel pipe columns 1 and H-shaped steel beams 4 were placed to construct a steel frame on the plane shown in Figure 9.

The width of the base plate 2A and the top plate 2B of the H-shaped steel column 1 of the first steel frame rigid frame 101 is 125 mm, the plate thickness is 19 mm, and the column side joint bolt hole 3 is provided to accommodate a high tension bolt M16.
The steel pipe columns 11 of the second steel frame rigid frame 102 installed on the lower floor are cold-formed square steel pipes □-300 × 300 × 12. The upper and lower diaphragms 12A and 12B have external dimensions of 325 mm × 325 mm and a plate thickness of 25 mm. At the intersection of the X and Y axes, bolt holes 13 corresponding to the bolt holes 3 of the H-shaped steel columns 1 on the upper floor are arranged.

The H-shaped steel beam 14 is H-450×250×9×19, and the flange width is twice that of the H-shaped steel beam 4, and the steel pipe column 11 is □-300×300×12. It is better to align the outer diameter dimension of the steel pipe column 11 and the flange width by making the H-shaped steel beam 14, for example, H-390×300×10×19.
The H-shaped steel beams 14 facing the exterior wall 8 are arranged with their flange ends aligned with the surface of the steel pipe columns 11 facing the exterior wall 8, and the module core in the material axis direction of the beams of the first steel frame rigid frame 101 is located 62.5 mm, which is 1/2 the width of the base plate 2A of the H-shaped steel column 1, from the exterior wall side end face of the flanges 17 of the H-shaped steel beams 14. Four bolt holes 15 are arranged in the upper flange 7A, centered on the intersection of the module cores.

The steel pipe column 11A' at the inside corner is a welded steel pipe measuring 375 mm x 300 mm x 12 mm, with a 25 mm thick steel plate fitted inside as the inner diaphragm 12. Note that although the steel pipe column 11A' has a rectangular cross section here, it may also be a roll-formed rectangular steel pipe measuring 400 mm x 400 mm in square cross section.
When H-390×300×10×19 is used for the H-shaped steel beam 14, the steel pipe column 11A' may be □-300×450×12 or □-450×450×12. The steel pipe column 11A' is on the axis connecting the two inside corners, and in the embodiment of FIG. 9, the H-shaped steel beam 14B is arranged on the left side and the H-shaped steel beam 14A' is arranged on the right side in a plan view. Here, the H-shaped steel beam 14B is eccentrically arranged so that the flange end face is aligned with the upper surface side of the steel pipe column 11A' in a plan view, and the H-shaped steel beam 14A' is eccentrically arranged so that the flange end face is aligned with the lower surface side of the steel pipe column 11A', but the module core X1 of the H-shaped steel beam 14B and the module core X2 of the H-shaped steel beam 14A' are on the same straight line.

As shown in FIG. 4, the H-shaped steel beams 14 and steel pipe columns 11 that are not on the extension lines of the outside and inside corners may be arranged so that their module cores coincide with their graphic cores.
Although not shown, the steel pipe column 11 and the H-shaped steel beam 14 are connected by attaching a beam bracket made of H-shaped steel of the same size as the H-shaped steel beam 14 to the steel pipe column 11 and bolting it to the H-shaped steel beam 14.
On the outer wall 8 side of each beam flange on the outer periphery, an outer wall mounting hardware 9 is provided with a protruding length of 30 mm, and an outer wall material is fitted into it, so that the outer wall lines of the upper and lower floors are aligned as shown in FIG.

100 Steel frame structure 101 First steel frame rigid frame 102 Second steel frame rigid frame 1 H-shaped steel column (column of first steel frame rigid frame)
2A Base plate 2B Top plate 3 Bolt hole for column side connection 4 H-shaped steel beam (beam of the first steel frame rigid frame structure)
5 Beam side joint bolt hole 7 Beam flange 7A Upper flange 7B Lower flange 8 Exterior wall 9 Standard exterior wall mounting member for first steel frame rigid frame structure (upper layer) 9a Exterior wall mounting member newly manufactured for first steel frame rigid frame structure (upper layer) 9b Exterior wall mounting member newly manufactured for first steel frame rigid frame structure (upper layer) 11 Steel pipe column (column of second steel frame rigid frame structure)
11A Steel pipe column constituting the outer periphery 11A' Steel pipe column arranged at inside corner Z2 11B Internal steel pipe column 12 Diaphragm 12A Upper diaphragm 12B Lower diaphragm 13 Bolt hole for column side connection of steel pipe column (diaphragm) 14 H-shaped steel beam (beam of second rigid frame structure)
14A H-shaped steel beam constituting the outer periphery 14A' H-shaped steel beam connected to the steel pipe column 11A' and constituting the outer periphery on the extension line of Z1 14B Internal H-shaped steel beam on the extension line of 14A 15 Bolt hole for beam side connection 17 Beam flange 17A Upper flange 17B Lower flange 19 (in the case of the conventional technology) Exterior wall mounting member for the second steel frame rigid frame (lower layer) 20 Interior material
D Module dimension S Square for setting bolt hole spacing
o Module core intersection
Wf Flange width of H-shaped steel beam of the first steel frame rigid frame X (1, 2) X-direction module core Y Y-direction module core Z1, Z2 Inside corner

Claims (5)

A steel frame structure in which a first steel frame rigid frame structure is an upper layer of a one-way rigid frame constructed by aligning the flange core or web core of an H-shaped steel column with the web core of an H-shaped steel beam, and a second steel frame rigid frame structure is arranged on the lower layer of the first steel frame rigid frame structure, which is a two-way rigid frame constructed of a steel pipe column with a rectangular cross section and an H-shaped steel beam,
The H-shaped steel beam constituting the second steel frame structure of the lower floor has a flange width that is at least twice the beam flange width of the first steel frame structure of the upper floor,
A steel frame structure characterized in that the H-shaped steel beams of the second steel frame rigid frame that face the exterior wall are fixed to the steel pipe column with the exterior wall side end face of the beam flange approximately aligned with the extension line of the exterior wall side face of the steel pipe column, and the beam core of the first steel frame rigid frame is aligned with a position 1/2 the beam flange width of the H-shaped steel beam of the first steel frame rigid frame from the outdoor side of the flange. The steel frame structure according to claim 1, characterized in that the beam flange width of the H-shaped steel beam constituting the second steel frame rigid frame and the outer diameter dimension of the steel pipe column are the same nominal dimension. The plan view is a staggered view with a pair of corners on the same axis in the X or Y direction,
With respect to a steel pipe column of one of the inside corner parts, the width dimension of at least a surface facing the steel pipe column of the other inside corner part and a surface opposite thereto is set to 1.5 times or more the beam flange width constituting the second steel frame rigid frame,
A member axis line is located at 1/2 of the beam flange width of the first steel frame moment frame from the outer wall side of the H-shaped steel beam flange extending from the steel pipe column of the one inside corner portion to the steel pipe column of the other inside corner portion;
3. The steel frame structure according to claim 1, wherein the material axis of the H-shaped steel beam extending from the steel pipe column of the other inside corner portion to the opposite side to the steel pipe column of the one inside corner portion is aligned from the outer wall side of the flange of the H-shaped steel beam to 1/2 of the beam flange width of the first steel frame rigid frame. A method for designing a steel frame structure, comprising: a first steel frame rigid frame having a one-way rigid frame formed by aligning the flange core or web core of an H-shaped steel column with the web core of an H-shaped steel beam as an upper layer; and a second steel frame rigid frame having a two-way rigid frame formed of a steel pipe column with a rectangular cross section and an H-shaped steel beam as a lower layer,
The flange width of the H-shaped steel beam constituting the second steel frame structure of the lower floor is set to be at least twice the beam flange width of the first steel frame structure of the upper floor,
A design method for a steel frame structure, characterized in that the H-shaped steel beams of the second steel frame rigid frame facing the exterior wall are fixed to the steel pipe column by approximately aligning the exterior wall end face of the beam flange on the extension line of the exterior wall face of the steel pipe column, and the beam core of the first steel frame rigid frame is aligned at a position 1/2 the beam flange width of the H-shaped steel beam of the first steel frame rigid frame from the outdoor side of the flange. The plan view plan is a staggered layout with a pair of corners on the same axis in the X or Y direction,
With respect to a steel pipe column of one of the inside corner parts, the width dimension of at least a surface facing the steel pipe column of the other inside corner part and a surface opposite thereto is set to 1.5 times or more the beam flange width constituting the second steel frame rigid frame,
A member axis line is located at 1/2 of the beam flange width of the first steel frame moment frame from the outer wall side of the H-shaped steel beam flange extending from the steel pipe column of the one inside corner portion to the steel pipe column of the other inside corner portion;
The design method for a steel frame structure according to claim 4, characterized in that the material axis line located at 1/2 of the beam flange width of the first steel frame rigid frame is aligned from the outer wall side of the flange of the H-shaped steel beam extending from the steel pipe column of the other inside corner portion to the opposite side to the steel pipe column of the one inside corner portion.

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