JP7729520B2 - Steel-framed building structure - Google Patents

Description

The present invention relates to steel-framed building structures.

In some cases, a steel-frame building structure is applied in which a load-bearing wall made of wood panels is arranged within a steel frame. For example, Patent Document 1 proposes a CLT load-bearing wall in which CLT panels are installed inside a steel frame. In this CLT load-bearing wall, the steel frame and CLT panels are joined with screws or bolts.

Japanese Patent Application Laid-Open No. 2021-1520

In steel-frame building structures in which wooden panels are arranged within a steel frame, such as the CLT shear walls described in Patent Document 1, both the steel columns and the wooden panels are structural elements that bear the vertical load, which is the building load above the steel beams. This makes it difficult to determine and evaluate the proportion of vertical load that they bear, and makes designing steel-frame building structures not easy.

Furthermore, due to the differences in the hysteresis characteristics of steel-framed structural bodies and wood panels, it is difficult to set and evaluate the structural characteristic coefficient (Ds value) during design, which also complicates the design of steel-framed building frames. For example, if the steel frame is a rigid frame, the hysteresis characteristics of the frame (panel zone) will be spindle-type, while the hysteresis characteristics of the wood-panel shear walls will be slip-type. Therefore, it is easy to understand that it is difficult to set the Ds value for a story when structural elements with different hysteresis characteristics exist within that story.

The present invention was made in consideration of the above-mentioned problems, and aims to provide a steel-framed building frame in which wooden panels are arranged within the steel frame, allowing for easy design.

In order to achieve the above object, one aspect of the steel frame building structure according to the present invention is as follows:
A steel-framed building structure having a foundation and a steel frame erected on the foundation,
The upper part of the wooden panel is attached to the steel beams that form the steel frame so that it can move up and down freely,
The lower part of the wooden panel is attached to the foundation so as to be freely movable up and down.

In this embodiment, the upper and lower portions of the wooden panels are attached to the steel beams and foundation so that they can move up and down, respectively. This means that the wooden panels no longer bear the building load (vertical load) above the steel beams, and only the steel frame bears the vertical load, making it easier to design a steel-frame building frame. Furthermore, because the lower portions of the wooden panels are attached to the foundation so that they can move up and down, it is possible to align the hysteresis characteristics of both the steel frame and the wooden panels, making it easier to set the structural characteristic coefficients of each story, which also facilitates the design of a steel-frame building frame. Furthermore, because the wooden panels are attached to the steel frame so that they can move up and down, even if the height of the steel frame (height between floors) deviates slightly from the design value, the deviation can be absorbed and the wooden panels can be incorporated into the steel frame.

Here, steel frames include rigid frame frames and braced frames. Rigid frame frames are a structural form with high resilience, and have spindle-type hysteresis characteristics that effectively absorb energy during earthquakes by generating plastic hinges at the ends of steel beams and columns. On the other hand, braced frames are a structural form with low resilience and high rigidity, and have slip-type hysteresis characteristics.

Wood panels can also be made from structural plywood, laminated timber (material made by fastening multiple pieces of lumber together with adhesives or screws), CLT (Cross Laminated Timber) panels, etc.

As mentioned above, shear walls made of wood panels generally have slip-type hysteresis loops. However, because they are attached to steel frames so that they can move freely up and down, when they are incorporated into rigid frame structures, they can exhibit spindle-type hysteresis loops similar to rigid frame structures. On the other hand, when they are incorporated into braced frames, they can exhibit slip-type hysteresis loops similar to braced frames. More specifically, the hysteresis loop of a wood panel can be changed by the connection configuration between the wood panel and the foundation. That is, if the connectors connecting the wood panel to the foundation have the deformation capacity to withstand both compressive and tensile forces, the wood panel can be given spindle-type hysteresis loops. On the other hand, if the connectors have the deformation capacity to withstand only tensile forces, the wood panel can be given slip-type hysteresis loops. Therefore, by connecting the wood panel to the foundation so that it has similar hysteresis loops depending on the structural type of the steel frame, it becomes easier to set the structural characteristic coefficients of each story.

In another aspect of the steel frame building structure according to the present invention,
The upper part of the wood panel is attached to the shear support metal fittings attached to the steel beams so that it can move up and down freely,
The shear support bracket has a plate-like member, and the plate-like member has a loose hole extending vertically.
The upper end of the wood panel is provided with a receiving groove in which at least a part of the shear receiving hardware is received,
The present invention is characterized in that a shaft-shaped fixing member that passes through the wood panel is loosely fitted into the loose hole of the plate-shaped member accommodated in the accommodation groove.

In this configuration, the shear support bracket connecting the steel beam and the upper part of the wooden panel comprises a plate-shaped member with a loose hole extending vertically. The plate-shaped member is accommodated in a receiving groove provided at the upper end of the wooden panel, and an axial fixing member that passes through the wooden panel is loosely fitted into the loose hole, allowing the wooden panel to be stably fixed to the steel beam while remaining movable up and down.

In another aspect of the steel frame building structure according to the present invention,
The upper part of the wood panel is attached to the shear support metal fittings attached to the steel beams so that it can move up and down freely,
The shear bracket comprises a shaft-shaped member;
The upper end of the wood panel is provided with a receiving groove in which at least a part of the shear receiving hardware is received,
The shaft-shaped member is accommodated in the accommodation groove so as to be movable up and down.

In this embodiment, the shear support hardware connecting the steel beam and the upper part of the wood panel is equipped with a shaft-shaped member, and the shaft-shaped member is housed in a housing groove provided at the upper end of the wood panel so that it can move up and down freely, allowing the wood panel to be stably fixed to the steel beam while still being able to move up and down freely.

In another aspect of the steel frame building structure according to the present invention,
A metal joint is embedded in the lower end of the wood panel,
The connecting fitting is
a steel pipe having a first hollow portion therein and a first thread groove at one end of the first hollow portion;
a steel shaft member including a steel core material and a first screw and a second screw located at both ends of the core material and having a diameter larger than that of the core material;
a steel cotter having a second hollow portion therein and a second thread groove;
a portion of the pipe is accommodated in the second hollow portion, the shaft member is accommodated in the second hollow portion and the first hollow portion, the first screw groove and the first screw are fixed, and the second screw groove and the second screw are fixed,
When either a tensile load or a compressive load is applied, the metal fitting is designed to bear the tensile load or the compressive load,
The cotter is fixed directly or indirectly to the foundation.

In this embodiment, the metal connector that directly or indirectly secures the bottom end of the wood panel to the foundation has both tensile and compressive properties, making it possible to incorporate wood panels with spindle-shaped hysteresis loops into rigid-frame steel frames. Here, "the cotter is directly or indirectly secured to the foundation" includes both cases where the cotter that constitutes the metal connector is directly secured to the foundation, and cases where the cotter is secured to a fixture or similar device secured to the foundation (indirectly secured to the foundation).

In another aspect of the steel frame building structure according to the present invention,
Axial metal fittings are embedded on the left and right sides of the lower end of the wooden panel,
When a tensile load is applied, either the left or right metal fitting is designed to bear the tensile load,
The metal connector is fixed directly or indirectly to the foundation.

In this embodiment, the metal fittings that directly or indirectly secure the bottom end of the wood panel to the foundation have only tensile properties, making it possible to incorporate wood panels with slip-type hysteresis loop characteristics into a braced steel frame.

Since the direction of horizontal forces acting on steel frames during earthquakes changes from left to right, in this configuration, the wood panel is fixed to the foundation on the left and right sides of its lower end with shaft-shaped metal fittings. This allows the wood panel to move up and down (including diagonally) as a tensile force acts on the metal fitting on the tension side depending on the direction of the horizontal force, displacing the fitting. Here, two metal fittings may be provided on each side, or a metal fitting may be provided in the center in addition to the left and right positions at the bottom of the wood panel.

In another aspect of the steel frame building structure according to the present invention,
The wood panel has a rectangular front view shape,
The wooden panel is attached to the shear support at the center of the rectangular upper piece so that it can move up and down freely.

In this case, the shear support bracket is attached to the center of the upper rectangular piece of the wooden panel when viewed from the front. This prevents the shear support bracket from being affected by displacement at or near the corners of the wooden panel when the steel frame or wooden panel deforms during an earthquake, allowing it to withstand shear forces.

Another aspect of the steel frame building structure according to the present invention is as follows:
The wood panel is characterized in that it is a CLT panel.

In this embodiment, because the wood panels are CLT panels, a wide range of panels can be used, for example, with dimensions up to 12m x 2.6m, making it possible to form load-bearing walls of various sizes.

As can be understood from the above explanation, the steel-framed building frame of the present invention allows for easy design of a steel-framed building frame in which wood panels are arranged within the steel frame.

FIG. 1 is a front view showing an example of a steel-framed building frame according to a first embodiment. FIG. 1 is an exploded perspective view illustrating an example of a shear support bracket and the mounting structure for the upper end of a wood panel. FIG. 10 is an exploded perspective view illustrating the mounting structure of another example of a shear support bracket and the upper end of a wood panel. FIG. 2 is a vertical cross-sectional view showing an example of a metal joint embedded below a wooden panel and indirectly fixed to the foundation in the steel-framed building frame according to the first embodiment. FIG. 5 is a vertical cross-sectional view showing a state in which a compressive force is acting on the metal joint shown in FIG. 4. FIG. 5 is a vertical cross-sectional view showing a state in which a tensile force is acting on the metal joint shown in FIG. 4. FIG. 10 is a front view showing an example of a steel-framed building frame according to a second embodiment. FIG. 10 is a vertical cross-sectional view showing an example of a joint fitting embedded below a wood panel and indirectly fixed to the foundation in a steel-framed building frame according to a second embodiment.

An example of a steel-framed building frame according to each embodiment will be described below with reference to the accompanying drawings. Note that in this specification and drawings, substantially identical components will be designated by the same reference numerals, and redundant explanations may be omitted.

[Steel-framed building structure according to the first embodiment]
First, an example of a steel-framed building frame according to the first embodiment will be described with reference to Figures 1 to 6. Here, Figure 1 is a front view showing an example of a steel-framed building frame according to the first embodiment. Also, Figures 2 and 3 are both exploded perspective views illustrating the attachment structure of an example of a shear-retaining metal fitting and the upper end of a wood panel. Furthermore, Figure 4 is a vertical cross-sectional view showing a state in which an example of a metal fitting is embedded below a wood panel and indirectly fixed to the foundation in the steel-framed building frame according to the first embodiment, and Figures 5 and 6 are vertical cross-sectional views showing states in which a compressive force and a tensile force are acting on the metal fitting shown in Figure 4.

The steel-frame building frame 100 has a reinforced concrete foundation 11 and a steel frame 10 erected on the foundation 11. The steel frame 10 has steel beams 12 formed from H-shaped steel and a plurality of steel columns (not shown) that support the steel beams 12. The steel columns are formed from square steel pipes, H-shaped steel, etc. Here, the steel frame 10 shown in Figure 1 is assumed to be a rigid frame in which the joints between the steel beams 12 and the steel columns are rigidly connected.

The steel-frame building structure 100 includes wooden panels 20 that are rectangular in front view inside the steel frame 10. Structural plywood, laminated lumber, CLT panels, etc. can be used for the wooden panels 20, but CLT panels are preferred as they can be used in a wide range of panels with dimensions up to 12m x 2.6m.

The upper part of the wooden panel 20 is attached to the steel beam 12 so as to be freely movable up and down, and the lower part of the wooden panel 20 is attached to the foundation 11 so as to be freely movable up and down.

First, we will explain the connection between the top of the wood panel 20 and the steel beam 12.

As shown in Figure 1, a shear support bracket 30 is attached to the lower flange 12a of the steel beam 12 with bolts 35. The shear support bracket 30 connects the steel beam 12 to the wood panel 20, and is a component that bears the shear force S that occurs when a horizontal force F during an earthquake acts on the steel frame 10, causing the steel frame 10 to displace.

As shown in Figure 2, the shear support bracket 30 comprises a steel mounting plate 32 that is rectangular in plan view and connected to the flange 12a of the steel beam 12, and a steel plate-like member 31 that is welded perpendicular to the mounting plate 32 at the center of the underside of the mounting plate 32. The plate-like member 31 has two loose holes 33 that are long in the vertical direction.

Bolts 35 are inserted through bolt holes (not shown) in the flanges 12a of the steel beams 12 via bolt holes 32a in the mounting plate 32 and tightened with nuts.

A storage groove 25 is provided at the upper end 21 of the wood panel 20, and a portion of the plate-shaped member 31 is stored in the storage groove 25 in the X1 direction. More specifically, the loose hole 33 of the plate-shaped member 31 is completely stored in the storage groove 25, and a portion of the upper part of the loose hole 33 is exposed above the storage groove 25, so that a portion of the plate-shaped member 31 is stored in the storage groove 25.

Two pin holes 28 that communicate with the two loose holes 33 are provided on the side of the plate-shaped member 31 at positions that correspond to the two loose holes 33 when part of the plate-shaped member 31 is accommodated in the accommodation groove 25. Here, the number of loose holes 33 may be one, or may be, for example, three or more.

After a portion of the plate-shaped member 31 is accommodated in the accommodation groove 25, a drift pin 40 (an example of an axial fixing member) is inserted into each pin hole 28 in the X2 direction, passes through the loose hole 33, and is inserted into the other pin hole 28 and then driven in, thereby fixing the plate-shaped member 31 to the wood panel 20 so that it can move freely up and down.

In other words, as shown in Figure 1, the wood panel 20 is attached to the shear support bracket 30, which is bolted to the steel beam 12, so that it can move freely in the Y1 direction (up and down).

In addition, in the illustrated example, the shear support bracket 30 is installed at the center of the rectangular upper piece of the wooden panel 20 (the center of width t0). By attaching the shear support bracket 30 to the center of the upper piece of the wooden panel 20 in this way, the shear support bracket 30 is able to withstand the shear force S without being affected by displacement at the corners of the wooden panel 20 or their vicinity when the steel frame 10 or wooden panel 20 deforms during an earthquake.

Figure 3 shows another form of shear support. The illustrated shear support 30A differs from shear support 30 in that, instead of the plate-shaped member 31, a round steel bar 34 (an example of a shaft-shaped member) is welded to the mounting plate 32 with bolt holes 32a.

A cylindrical storage groove 26 is provided at the upper end 21 of the wood panel 20 to accommodate the round steel bar 34, and the round steel bar 34 is accommodated in the storage groove 26 in the X3 direction.

With the round steel bars 34 housed in the housing grooves 26, the shear support brackets 30A are bolted to the steel beams 12, allowing the wood panels 20 to be attached to the steel beams 12 in a manner that allows them to move freely up and down.

Whether the shear-retaining hardware 30, 30A shown in Figures 2 and 3 is used, the upper part of the wooden panel 20 can be attached to the steel beam 12 so that it can move up and down freely. As a result, as shown in Figure 1, the wooden panel 20 no longer bears the vertical load W, which is the building load above the steel beam 12. As a result, only the steel frame 10 bears the vertical load W, making it possible to easily design a steel-frame building frame 100.

Furthermore, because the wooden panels 20 are attached to the steel frame 10 so that they can move up and down freely, even if the height of the steel frame 10 (height between floors) deviates slightly from the design value, the deviation can be absorbed and the wooden panels 20 can be incorporated into the steel frame 10.

Next, we will explain the connection between the bottom of the wood panel 20 and the foundation 11.

As shown in Figure 1, a fixing jig 60 made of channel steel or the like is fixed to the upper end of the foundation 11 via anchor bolts 15, and a metal connector 50 is fixed to the fixing jig 60, with a portion of the metal connector 50 embedded inside the wood panel 20 from the lower end 22. In other words, the lower part of the wood panel 20 is indirectly fixed to the foundation 11 via the fixing jig 60. However, the metal connector 50 may also be fixed directly to the foundation 11.

As shown in Figure 4, the connector 50 includes a steel pipe 51, a steel cotter 53, and a steel shaft member 55.

The pipe 51 has a first hollow portion 51a inside, a first screw groove 51b at one end of the first hollow portion 51a, and a threaded circumferential surface 51c. The steel pipe 51 is a pipe plug screw bolt (pipe LSB) with threads on the circumferential surface 51c. The pipe 51 is fixed by screwing the circumferential surface 51c into the wood panel 20. Although not shown, a pipe without threads on the circumferential surface may be placed in a groove in the wood panel, and the wall of the groove and the circumferential surface of the pipe may be fixed with adhesive.

The cotter 53 has a second hollow portion 53a inside and a second screw groove 53b at its end. Part of the cotter 53 is screwed into the bottom end of the wood panel 20, and both components are arranged inside the wood panel 20 so that part of the pipe 51 is housed in the second hollow portion 53a. The bottom end of the cotter 53 is placed on the top end of the fixing jig 60.

A deformation substitute gap 29 with a height dimension t1 is provided above the cotter 53 inside the wood panel 20.

The shaft member 55 has a steel core material 55a and a first screw 55b and a second screw 55c, which are located at both ends of the core material 55a and have a larger diameter than the core material 55a. The shaft member 55, which has the first screw 55b and the second screw 55c at both ends and the relatively smaller diameter core material 55a in the center, is formed, for example, by rolling.

Because the core material 55a has a relatively smaller diameter than the first thread 55b and second thread 55c at both ends, a gap G is formed between the core material 55a and the first hollow portion 51a of the pipe 51. This gap G is a gap for buckling deformation, which will be described in detail below.

A shaft member 55 is disposed in the first hollow portion 51a and the second hollow portion 53a, and the first screw 55b is threaded into the first screw groove 51b, and the second screw 55c is threaded into the second screw groove 53b, thereby fixing both ends of the shaft member 55 to the pipe 51 and the cotter 53.

The second screw 55c is threaded into the second screw groove 53b, passes through the second screw groove 53b, and threads into the screw groove 60a of the fixing jig 60. The head of the anchor bolt 15 fixed to the foundation 11 is threaded into a separate screw groove 60b of the fixing jig 60, and the shaft member 55 of the connecting fitting 50 is joined to the fixing jig 60 fixed to the foundation 11.

As shown in Figure 1, the horizontal force F acting during an earthquake displaces the steel frame 10 and the wooden panel 20 left and right, and the left and right displacement of the wooden panel 20 causes a compressive force N1 and a tensile force N2 to act alternately on the connecting fittings 50 located on the left and right below the wooden panel 20.

As shown in Figure 5, when a compressive force N1 acts on the wood panel 20 and the connecting fitting 50, the wood panel 20 is pushed downward in the Y2 direction, the height dimension of the deformation substitute gap 29 also decreases to t2 (<t1), and the lower end of the wood panel 20 approaches the fixing jig 60.

Furthermore, if the applied compressive force N1 is greater than the buckling strength of the core material 55a, the core material 55a will buckle and deform in the gap G of the first hollow portion 51a of the pipe 51, and will come into contact with the wall surface of the first hollow portion 51a, restricting further deformation.

In this way, when a compressive force N1 acts on the wood panel 20 and the connector 50 during an earthquake, the core material 55a of the shaft member 55 that makes up the connector 50 buckles and deforms, effectively absorbing the strain energy during the earthquake. In this case, the first screw 55b and second screw 55c of the shaft member 55, which are larger in diameter than the central core material 55a, are fixed to the pipe 51 and cotter 53 at both ends of the core material 55a, respectively. As a result, the first screw 55b and second screw 55c do not break first in response to the compressive force N1, and the core material 55a buckles and deforms.

Furthermore, when the core material 55a buckles, the pipe 51 and cotter 53 are located on the outer periphery of the core material 55a, and the wood panel 20 is located on the outer periphery of the pipe 51 and cotter 53. Therefore, even though the core material 55a buckles in the first hollow portion 51a of the pipe 51 and the second hollow portion 53a of the cotter 53, it is restrained by the pipe 51, the cotter 53, and the wood panel 20, preventing buckling failure of the core material 55a.

On the other hand, as shown in Figure 6, when a tensile force N2 acts on the wood panel 20 and the connecting fitting 50, the wood panel 20 is pulled upward in the Y3 direction, the height dimension of the deformation substitute gap 29 increases to t3 (> t1), and the lower end 22 of the wood panel 20 also moves away from the fixing jig 60.

Furthermore, if the applied tensile force N2 is greater than the tensile strength of the core material 55a, the core material 55a will deform in the tensile direction, thereby absorbing strain energy during an earthquake.

In this way, by connecting the lower part of the wood panel 20 to the foundation 11 via a metal joint 50 that exhibits deformation performance in both tension and compression, the lower part of the wood panel 20 can be attached to the foundation 11 so that it can move freely up and down.

By applying a metal connector 50 that exhibits deformation performance in both tension and compression, it is possible to incorporate wood panels 20 that also have spindle-shaped hysteresis characteristics into a steel frame 10, which is a rigid frame structure with a spindle-shaped hysteresis characteristic. This makes it possible to easily set the structural characteristic coefficients of each story by making the hysteresis characteristics of the entire story spindle-shaped.

[Steel-framed building structure according to the second embodiment]
Next, an example of a steel-framed building frame according to a second embodiment will be described with reference to Figures 7 and 8. Here, Figure 7 is a front view showing an example of a steel-framed building frame according to the second embodiment. Also, Figure 8 is a vertical cross-sectional view showing an example of a metal joint embedded below a wood panel and indirectly fixed to a foundation in the steel-framed building frame according to the second embodiment.

The steel-framed building frame 100A differs from the steel-framed building frame 100 in that it has a simpler connector 70 instead of the connector 50.

Furthermore, the steel frame structure 10 shown in Figure 7 is a braced frame structure in which the joints between the steel beams 12 and the steel columns (not shown) are pin-connected, and braces (not shown) are provided within the frame structure.

As shown in FIG. 8 , the connector 70 is a shaft-shaped metal fitting and includes a first threaded portion 71 that is screwed into the wood panel 20, a deformed portion 72 (non-threaded portion) that does not have a thread groove and is not fixed to the wood panel 20, and a second threaded portion 73 that is screwed into the thread groove 60a of the fixing jig 60. The length t4 of the first threaded portion 71 is set to, for example, approximately 400 mm to 450 mm, and the length t5 of the deformed portion 72 is set to, for example, approximately 100 mm to 150 mm. Therefore, the embedded length t6 of the connector 70 into the wood panel 20 is set to, for example, approximately 500 mm to 600 mm (e.g., 550 mm). The connector 70 is formed, for example, by a lag screw bolt. Note that in addition to the illustrated example, a fully threaded lag screw bolt may also be used as the connector.

Unlike the connecting metal fitting 50 shown in Figure 4, the shaft-shaped connecting metal fitting 70 only bears tensile forces. Therefore, as shown in Figure 7, when the steel frame 10 and wood panel 20 are displaced alternately left and right due to horizontal force F acting during an earthquake, the connecting metal fitting 70 on the tension side bears the tensile force N2, while the connecting metal fitting 70 on the compression side does not bear the compressive force N1.

As shown in Figure 8, when the tensile force N2 acting on the metal connector 70 is greater than the metal connector 70's tensile strength, the metal connector 70 deforms in the Y4 direction toward the tensile side, absorbing strain energy during an earthquake. As described above, the metal connector 70 has a deformation section 72 of approximately 100 mm to 150 mm, which can be expected to deform approximately 30 mm. Furthermore, because the first threaded section 71, which is approximately 400 mm to 450 mm long, is screwed into the wood panel 20, the metal connector 70 and the wood panel 20 can be sufficiently fixed together even when the metal connector 70 (deformation section 72) is deformed.

In this way, the metal connector 70 connecting the lower end 22 of the wooden panel 20 to the foundation 11 only bears the applied tensile load, making it possible to incorporate wooden panels 20 with similar slip-type hysteresis characteristics into the steel frame 10, which is a braced frame with slip-type hysteresis characteristics. This allows the hysteresis characteristics of the entire story to be slip-type, making it easy to set the structural characteristic coefficients of the story.

As explained above, by applying connectors 50, 70 with similar hysteresis characteristics depending on the structural type of the steel frame (frame frame or braced frame), the structural characteristic coefficients of each story can be easily set, enabling easy design of steel frame building structures.

Note that other embodiments may be possible in which other components are combined with the configurations described in the above embodiments, and the present invention is in no way limited to the configurations shown here. In this regard, changes can be made without departing from the spirit of the present invention, and can be determined appropriately depending on the application form.

10: Steel frame structure 11: Foundation 12: Steel beam 15: Anchor bolt 20: Wood panel 21: Upper end 22: Lower end 25, 26: Accommodation groove 28: Pin hole 29: Deformation substitute gap 30, 30A: Shear support metal fitting 31: Plate-shaped member 32: Mounting plate 32a: Bolt hole 33: Loose hole 34: Shaft-shaped member 40: Drift pin 50: Joint metal fitting 51: Pipe 51a: First hollow portion 51b: First screw groove 51c: Peripheral surface 53: Cotter 53a: Second hollow portion 53b: Second screw groove 55: Shaft member 55a: Core material 55b: First screw 55c: Second screw 60: Fixing jig 60a, 60b: Screw groove 70: Joint metal fitting 71: First screw portion 72: Deformed portion (non-threaded portion)
73: Second screw part 100, 100A: Steel frame building frame F: Horizontal force S: Shear force W: Vertical load N1: Compression force N2: Tensile force

Claims (5)

A steel-framed building structure having a foundation and a steel frame erected on the foundation,
The upper part of the wooden panel is attached to the steel beams that form the steel frame so that it can move up and down freely,
The lower part of the wood panel is attached to the foundation so as to be freely movable up and down,
A metal joint is embedded in the lower end of the wood panel,
The connecting fitting is
a steel pipe having a first hollow portion therein and a first thread groove at one end of the first hollow portion;
a steel shaft member including a steel core material and a first screw and a second screw located at both ends of the core material and having a diameter larger than that of the core material;
a steel cotter having a second hollow portion therein and a second thread groove;
a portion of the pipe is accommodated in the second hollow portion, the shaft member is accommodated in the second hollow portion and the first hollow portion, the first screw groove and the first screw are fixed, and the second screw groove and the second screw are fixed,
When either a tensile load or a compressive load is applied, the metal fitting is designed to bear the tensile load or the compressive load,
A steel-framed building structure, characterized in that the cotter is fixed directly or indirectly to the foundation. The upper part of the wood panel is attached to the shear support metal fittings attached to the steel beams so that it can move up and down freely,
The shear support bracket has a plate-like member, and the plate-like member has a loose hole extending vertically.
The upper end of the wood panel is provided with a receiving groove in which at least a part of the shear receiving hardware is received,
The steel-framed building structure described in claim 1, characterized in that an axial fixing member that penetrates the wood panel is loosely fitted into the loose hole of the plate-shaped member accommodated in the accommodation groove. The upper part of the wood panel is attached to the shear support metal fittings attached to the steel beams so that it can move up and down freely,
The shear bracket comprises a shaft-shaped member;
The upper end of the wood panel is provided with a receiving groove in which at least a part of the shear receiving hardware is received,
2. The steel-framed building structure according to claim 1, wherein the shaft-shaped member is accommodated in the accommodation groove so as to be movable up and down. The wood panel has a rectangular front view shape,
4. The steel-framed building structure according to claim 2 or 3 , characterized in that the wooden panel is attached to the shear support metal bracket at the center position of the rectangular upper piece so as to be freely movable up and down. The steel frame building structure according to any one of claims 1 to 4 , characterized in that the wood panels are CLT panels.