JP6274792B2 - Building ramen frame - Google Patents

Description

  The present invention relates to a frame structure for a building composed of two pillars and beams spanned between the pillars.

  As a ramen frame for a building, as shown in FIG. 10, a column 52 and a beam 53 are made of steel such as H-shaped steel, and a panel zone 54 is formed at the joint between the columns 52 and 53. The pillar 62 and the beam 63 include an assembly column of a truss frame, a column / beam set using an assembly beam, and the like with string members 62a and 63a and diagonal members 62b and 63b, respectively.

  Although it is not a frame structure of pillars / beams, as a load-bearing wall frame that constitutes the wall, two parallel metal vertical members standing in parallel and a plurality of horizontal members laid up and down between these vertical members A ladder-type load-bearing wall frame including a material (for example, Patent Document 1) is known.

JP 2005-325637 A

  The frame structure formed by the pillars and beams of the building, when the shape of the H-shaped steel, etc. is used for the pillars and beams as shown in the example of FIG. It becomes a beam collapse type, and it is necessary to repair the building after the earthquake. In addition, local buckling may lead to brittleness.

  In addition, when the frame structure is constituted by the truss-shaped assembly columns and beams as in the example of FIG. 11, the weight of the building is supported by the upper and lower chord members 62a and 62a. Brittle fracture is caused by buckling of the ends of the upper and lower chord members 62a, 62a at the column base position. With regard to trusses, it has been shown in previous studies that, depending on the buckling at the ends of the upper and lower chord members 62a and 62a, depending on the diameter-thickness ratio and slenderness ratio, energy absorption ability can be obtained. There are concerns about the impact of buckling on the floor and outer walls. Therefore, even when a frame structure is composed of truss-like assembly columns and beams, it is necessary to greatly repair the building after the earthquake.

  The purpose of the present invention is that when damage is caused by a large earthquake or the like, the damaged part becomes a limited part, the support capacity of the upper load is not lowered, the repair after the earthquake is easy, and the weight is reduced It is to provide a frame structure for buildings that can be designed to various strengths without changing the outer shape.

The ramen frame of the first building of the present invention is a ramen frame of a building composed of two columns and a beam spanned between both columns, and each of the columns is an array of these columns. 2 and longitudinal members consisting of a parallel RHS mutually aligned in the direction Ri ladder der having a transverse member of the plurality of made of metal that are laid side by side up and down between the longitudinal members, said cross member is vertically And a web portion connected to the flange portions, and the longitudinal direction of the transverse member of the plate portion on the four side surfaces of the longitudinal portion made of the web portion and the square steel pipe is One of the side plates is close to each other .
The ramen frame of the second building of the present invention is a ramen frame of a building composed of two columns and a beam spanned between both columns, and each of the columns is an array of these columns. It is a ladder shape having two metal vertical members parallel to each other in a direction and a plurality of metal horizontal members laid up and down between the vertical members, and the horizontal members are positioned vertically. It is a groove shape which has a flange part to perform and a web part connected to these flange parts, and both ends of the above-mentioned cross member are welded to the above-mentioned vertical member via a backing plate.
In the frame structures of the first and second buildings, a shear yield inducing hole may be provided in the vicinity of the upper and lower flange portions in the web portion of the groove-shaped cross member.

  According to the ramen frame of this configuration, each column is a ladder consisting of two vertical members and a plurality of horizontal members that are laid up and down between the vertical members. In the case where damage is caused by the above, it is possible to adopt a configuration in which the cross member used as the binding material between the vertical members of the columns yields instead of the vertical members and beams of the columns. Therefore, even after damage due to an earthquake or the like, the support capacity of the upper load does not decrease, and it can withstand the building's own weight until the completion of repair after the earthquake. Moreover, the deformation of the cross member used as the binding material is only in-plane deformation, and the deformation does not affect the interior material and the exterior material. For these reasons, it can be restored only by repairing the cross member as the binding material, and repair after the earthquake becomes easy. In addition, because the column is composed of two vertical members and a cross member that is the binding material between them, the weight of the steel material that constitutes the column has the same rigidity compared to the rigid frame structure with the bending rigidity of the shape steel As well as lighter. Furthermore, since the column is composed of two vertical members and a cross member used as a spelling material between them, it is possible to design the strength with the cross section and number of cross members used as the spelling material, regardless of the size of the column cross section. Therefore, various strengths can be designed without changing the outer shape of the frame.

In the present invention, the beam is preferably joined to both of the two longitudinal members of the pillars.
By joining the beams to both vertical members of each column, the beam load is transmitted directly to both vertical members, effectively functioning the column that is an assembly column consisting of two vertical members and cross members. It can be demonstrated.

In this invention, it is preferable that the column and the beam are joined with an intermediate bolt.
Conventionally, there is no medium-strength rigid frame structure, and high-strength bolts are used. However, according to medium-bolts, which are standard bolts used in homes, compared to high-strength bolts, management of joining work This eliminates the need for a dedicated tool and reduces the material cost. Even if an intermediate bolt is used, the present invention is composed of two vertical members and a plurality of cross members as a binding material as described above, and concentrates damage on the cross member as a binding material. The behavior of the earthquake does not become a history of slip or the like due to the slip of the bolt joint portion between the column and the beam, and a spindle-shaped history can be realized.

In this invention, both ends of the cross member of the pillar are joined to the both vertical members via stiffening members that stiffen the cross member, and the stiffening member faces the surface of the vertical member. a plate portion joined contact with the a side surface of the cross member faces contact with may have a plate portion joined.
In this configuration, both ends of the column cross member are joined to both vertical members via stiffening members that stiffen the cross member, so that a rigid region is formed at the end of the cross member. Strength and rigidity in the vicinity of the portion and the end portion can be ensured. Even when the distance between the two vertical members is wide, both ends of the cross member are joined to the vertical member via the stiffening member as described above, so that a rigid region is formed at the end of the cross member, The shear span ratio of the material can be reduced, and shear yield can be easily achieved. In other words, when the cross member yields a bending yield, the yield strength is reduced due to the buckling of the compression flange due to repeated loading, so it is preferable to use the shear yield, but when using the shear yield, the shear span ratio of the cross member is a problem. It becomes. However, since a rigid zone is formed as described above and the shear span ratio is easily reduced, shear yielding occurs. By becoming shear yielding, it becomes easier to absorb stable energy than in the case of bending yielding.

When both ends of the cross member are joined to the two vertical members via the stiffening member, the following configurations may be employed.
That is, the stiffening member has a flat plate shape, the both plate portions of the stiffening member continue in the same plane, and a surface parallel to the surface of the rigid frame in the longitudinal member; You may make it each join to the side surface of the said cross member aligned in the same plane.
In this configuration, the longitudinal member stiffening member is joined to the surface along the longitudinal direction of the transverse member, so unlike the case of joining to the surface perpendicular to the longitudinal direction of the transverse member, The problem of out-of-plane deformation at the joint is eliminated, and the yield strength and rigidity are further improved.

  In addition, the stiffening member is an L-shape formed by a plate portion that is in surface contact with a surface of the vertical member that is perpendicular to the surface of the rigid frame and a plate portion that is in surface contact with the side surface of the transverse member. It may be a shape. In the case of this configuration, the stiffening member does not protrude from the surface parallel to the wall surface of the vertical member, and the fit is improved.

Moreover, holes for shear yield induction may be provided at a location deviating from the joint between the stiffening member at both end portions of the cross member. In this case, the hole for the shear yield inducing provided in each portion which becomes both end portions of the crosspiece may be a plurality, respectively.
In addition to reducing the shear span of the cross member by the stiffening member and facilitating the shear yield, when the holes for inducing shear yield are provided at both ends of the cross member in this way, the shear yield of the cross member is further increased. If the holes are provided at both ends of the cross member, a plastic hinge is formed at the end of the cross member, and the plastic deformation region becomes large. As a result, the deformation allowance at the time of large deformation can be earned and the plastic deformation ability can be improved.
In addition, when a hole for shear yield induction is provided, in addition to adjusting the shear strength and stiffness of the cross member by designing the size of the stiffening member, the shear strength and stiffness can be adjusted depending on the size and number of the holes. It becomes possible.

The ramen frame of the first building of the present invention is a ramen frame of a building composed of two columns and a beam spanned between both columns, and each of the columns is an array of these columns. It is a ladder shape having two vertical members made of parallel square steel pipes arranged in the direction and a plurality of metal cross members arranged vertically between the vertical members, and the cross members are vertically It is a groove shape which has the flange part located and the web part connected to these flange parts, and one side along the longitudinal direction of the said cross member of the said web part and the plate part of the four side surfaces of the vertical member which consists of the said square steel pipe Because of the close proximity of the plate on the side of the plate, if damage occurs due to a major earthquake, etc., the damaged part becomes a limited part, the support capacity of the upper load does not drop, and the post-earthquake Repair is easy, weight reduction is possible, and the external shape must not be changed. It can be designed in various intensity of.
The ramen frame of the second building of the present invention is a ramen frame of a building composed of two columns and a beam spanned between both columns, and each of the columns is an array of these columns. It is a ladder shape having two metal vertical members parallel to each other in a direction and a plurality of metal horizontal members laid up and down between the vertical members, and the horizontal members are positioned vertically. In this case, each cross member is welded to the vertical member through a backing plate, and therefore the cross member is damaged by a large earthquake or the like. The damaged part becomes a limited part, the support capacity of the upper load is not reduced, the repair after the earthquake is easy, the weight can be reduced, and it can be designed with various strengths without changing the outer shape .

It is a front view of the building provided with the ramen frame concerning a 1st embodiment of this invention. (A) is the elements on larger scale of the column of the same frame, (B) is the IIB-IIB sectional drawing. (A) is an enlarged view of the III part of FIG. 1, (B) is the side view, (C) is the III C-III C sectional drawing. (A) is an enlarged view of the IV part of FIG. 1, (B) is the IVB-IVB sectional view, and (C) is the IVC-IVC sectional view. (A) is the enlarged view of the V section of FIG. 1, (B) is the top view, (C) is the VC-VC sectional drawing. (A) is a front view of a different ladder-shaped column in another embodiment of the present invention, and (B) is a side view thereof. It is the front view, top view, side view, and back view of the junction part of the vertical member and horizontal member in the same pillar. It is explanatory drawing which shows the change of a plastic deformation capability by the difference in the hole position in a cross member in the same pillar. It is the front view, top view, side view, and back view of the junction part of the vertical member and cross member in the ladder-shaped column in still another embodiment. It is explanatory drawing which shows an example of the conventional ramen frame. It is explanatory drawing which shows the example from which the conventional ramen frame differs.

  A first embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, the ramen frame 1 of this building is composed of two columns 2 and 2 and a beam 3 spanning the columns 2 and 2. In the illustrated example, the ramen frame 1 of this embodiment is applied to the central portion of the first floor outer wall in a two-story steel structure building. The ramen frame 1 may be applied to an end portion of the outer wall portion or may be applied to an inner wall portion of a building. The ramen frame 1 can also be applied to the second floor portion of a building, and can also be applied to three or more floors when the building has three or more floors.

  This ramen frame 1 is installed on each column 2 in parallel with two vertical metal members 4 and 4 arranged in the direction in which the columns 2 are arranged, and between the vertical members 4 and 4. It is a ladder shape having a plurality of (six in FIG. 1) metal cross members 5 which become the binding materials.

As shown in FIG. 2, a square steel pipe is used for the longitudinal member 4. The vertical member 4 may be a steel material such as a shaped steel having another cross-sectional shape such as a circular steel pipe or an H-shaped steel other than a square steel pipe. Crosspiece 5 is made parallel to the Plane of the ramen Frames, using the steel material have a seat屈補rigid portion along the upper and lower edge. Specifically, the cross member 5 is a groove-shaped member having flange portions positioned vertically and web portions connected to the flange portions, and the web portions are formed in the square shape as shown in FIG. Of the four side plate portions of the vertical member 4 made of steel pipe, the one side plate portion along the longitudinal direction of the cross member 5 is close to each other. The cross member 5 does not have a large slenderness ratio. For example, a narrow steel material having a B / t of about 30 to 45 (B = height of the steel material cross section, t = thickness of the steel material), particularly buckling the upper and lower edges. A stiffened steel material is preferable, and in this example, a steel material is used in which the cross-sectional shape is bent into a groove shape to form the flange portion 5b. The flange portion 5b serves as the buckling stiffening portion.
The cross member 5 is installed between the vertical members 4 and 4 in a posture in which the web portion 5 a is vertical, and both ends thereof are fixed to the vertical member 4 via the contact plate 6 by welding. In the illustrated example, the side surface that is the outer surface of the web portion 5a is directed to the outdoor side, but may be directed to the indoor side. For example, when a cross-section steel 5 having a width of the web portion 5a of 100 mm, a width of the flange portion 5b of 40 mm, and a thickness of 2.3 mm is used for the cross member 5, the length of the cross member 5 is 100 to 150 mm. Each cross member 5 bears a shearing force at its web portion 5a and bears a bending moment at its upper and lower flange portions 5b.

At both end portions of the web portion 5a of the cross member 5, holes 7 for inducing shear yield are provided. In the example shown in the figure, two shear yield inducing holes 7 are vertically arranged. As a result, when a load such as an earthquake acts on the column 2, the cross member 5 is more likely to shear yield before the vertical member 4. One or three or more holes 7 for inducing shear yield may be used. Further, a hole 7 for a plurality of shear yield induced, may be provided side by side, but it may also be provided side by side in rows and columns.

  As shown in FIG. 1, the two ladder-shaped columns 2 are respectively built on the foundation 11, and both ends of the beam 3 are joined to the upper ends of both the columns 2. The beam 3 is made of H-section steel, and is installed in a posture in which the web portion 3a is vertical as shown in FIG. When the distance between the pillars 2 is long, a plurality of H-shaped steels are joined together to form a beam 3 having a required length. The beam 3 becomes a part of the large beam of the building.

  FIG. 3 shows the erection part of the pillar 2 to the foundation 11. A plurality of anchor bolts 12 are provided on the foundation 11 along the construction surface of the rigid frame 1 (FIG. 1) so that the threaded portion protrudes upward from the top end of the foundation 11. A column base portion 13 provided at the lower end of each vertical member 4 of the column 2 is coupled to the screw portion. The column base portion 13 includes a horizontal end plate 13a welded to the lower end surface of the vertical member 4 which is a square steel pipe, a planar U-shaped support plate 13b welded to the bottom surface of the end plate 13a, The U-shaped support plate 13b includes a pair of triangular triangular support plates 13c that are welded to the side surface, and a horizontal base plate 13d that is welded to the lower ends of the U-shaped support plate 13b and the triangular support plate 13c. The U-shaped support plate 13b may be integrated, or may be formed by combining a plurality of plate materials. The anchor bolts 12 are inserted into holes formed in the base plate 13d, and the nuts 14 are fastened to the anchor bolts 12 from the upper side of the base plate 13d, so that the vertical members 4 of the pillars 2 are fixed to the foundation 11.

  FIG. 4 shows the joint between the column 2 and the beam 3. A column head 15 is provided at the upper end of each vertical member 4 of the column 2. The column head 15 includes a horizontal end plate 15a welded to the upper end surface of the vertical member 2 which is a square steel pipe, a plurality of support plates 15b which are welded to the upper surface of the end plate 15a and extend upward, and these supports. It consists of a horizontal top plate 15c welded to the upper end of the plate 15b. The column head 15 provided at the upper end of one of the two vertical members 4 of the column 2 is joined to the lower surface of the junction box 16 constituting one end of the beam 3 by a bolt 17 and the other vertical member 4 is joined. The column head 15 provided at the upper end of the material 4 is joined to the lower flange portion 3 c of the H-shaped steel constituting the beam 3 with a bolt 17 and a nut 18. Thereby, the pillar 2 and the beam 3 are joined. Since a history such as slip due to slipping does not remain in this joint as will be described later, a standard medium bolt is used as the bolt 17.

  The junction box 16 is joined to the end face of the channel steel constituting the beam 3 by welding. A beam 20 that forms a large beam together with the beam 3 is bonded to the side surface of the joint frame 16 opposite to the beam 3 of the rigid frame 1. In the illustrated example, this beam 20 is also made of H-section steel. Further, a shaft column 21 that supports the second floor portion of the building is joined to the upper surface of the joining box 16. In the illustrated example, the shaft column 21 is composed of a single square steel pipe.

  FIG. 5 shows two H-shaped steel joints in the beam 3 of the rigid frame 1. As shown in the figure, the two H-section steels 3A and 3B are butted with a slight gap therebetween, and the web sections 3Aa and 3Ba of the respective H-section steels 3A and 3B are placed on both sides of the web sections 3Aa and 3Ba. It joins via the web joint board 22 arranged. Further, the upper flange portions 3Ab and 3Bb are joined to each other via a flange joint plate 23 disposed on the upper side of the flange portions 3Ab and 3Bb, and the lower flange portions 3Ac and 3Bc are joined to each other under the flange portions 3Ac and 3Bc. It joins via the flange joint board 24 distribute | arranged to the side. For fixing the web portions 3Aa and 3Ba and the web joint plate 22, the upper flange portions 3Ab and 3Bb and the flange joint plate 23, and the lower flange portions 3Ac and 3Bc and the flange joint plate 24, the high-strength bolt 26 is used. And a nut 27 is used.

  In FIG. 1, a shaft girder 30 in which a plurality of H-shaped steels are joined together is installed at the upper end of the shaft column 21 built on the column 2 of the rigid frame 1. Further, an intermediate shaft column 31 is provided between the shaft beam 30 and the beam 3 of the rigid frame 1 as required for strength and the like.

  According to the ramen frame 1 having the above configuration, each pillar 2 has a ladder shape composed of two vertical members 4 and a plurality of horizontal members 4 arranged vertically between these vertical members. In the case where damage is caused by an excessive load, the cross member 5 as a binding material between the vertical members 4 of the columns 2 yields instead of the vertical members 4 and the beams 3 of the columns 2. Therefore, even after damage due to an earthquake or the like, the support capacity of the upper load does not decrease, and it can withstand the building's own weight until the completion of repair after the earthquake. Further, the deformation of the cross member 5 serving as the binding material is only in-plane deformation, and the deformation does not affect the interior material or exterior material (not shown) of the building. For these reasons, it can be restored only by repairing the cross member 5 as the binding material, and repair after the earthquake becomes easy. In addition, since the column 2 is composed of two vertical members 4 and a cross member 5 serving as a spelling material between them, the weight of the steel material constituting the column 2 is the same as that of the rigid frame structure based on the bending rigidity of the shape steel. It becomes lightweight as a structure with strength. Further, since the column 2 is composed of two vertical members 4 and a cross member 4 serving as a binding material between them, the cross section and the number of the cross members 4 serving as the binding material are strong regardless of the size of the column cross section. Therefore, it is possible to design various strengths without changing the outer shape of the frame.

  In this example, since the beam 3 is joined to both of the two vertical members 4 of each column 2, the load of the beam 3 is directly transmitted to both of the vertical members 4 of each column 2. The function of the pillar 2 which is an assembly pillar composed of the vertical member 4 and the transverse member 5 can be effectively exhibited.

  Since the column 2 and the beam 3 are joined with a middle bolt, the following advantages are obtained. Conventionally, there is no medium-strength rigid frame structure, and high-strength bolts are used. However, according to medium-bolts, which are standard bolts used in homes, compared to high-strength bolts, management of joining work This eliminates the need for a dedicated tool and reduces the material cost. Even if the middle bolt is used, the rigid frame 1 of this embodiment is composed of the column 2 composed of the two vertical members 4 and the plurality of cross members 5 serving as the binding materials as described above, and the damage is treated as a spelling material. In this case, the behavior of the earthquake does not become a history of slip or the like due to the slip of the bolt joint portion between the column 2 and the beam 3, but a spindle-shaped history can be realized.

  The cross member 5 serving as the binding material of each of the pillars 2 is not a large slenderness ratio, and uses a narrow steel material, so that it becomes a member that yields a shear yield, and a stable restoring force characteristic is obtained. The frame can withstand repeated earthquakes.

Next, different configurations of the ladder-shaped column 2 in another embodiment of the present invention will be described.
The ladder-shaped column 2 shown in FIG. 6 is constructed by arranging two metal vertical members 4 and 4 parallel to each other in the same manner as in the above-described embodiment, and vertically arranged between the vertical members 4 and 4. And a plurality of metal cross members 5. A rectangular steel pipe is used for the vertical member 4, and a steel material bent into a groove shape is used for the horizontal member 5 as described above. As shown in FIG. 7C, the cross member 5 is constructed between the vertical members 4 and 4 in a posture in which the web portion 5a is vertical, and the side surface which is the outer surface of the web portion 5a is the vertical member 4 It is flush with the inner surface 4a.

  Both end portions of the cross member 5 are joined to the vertical member 4 via stiffening members 40 for stiffening the cross member 5, respectively. Here, a rectangular flat steel material is used as the stiffening member 40. Specifically, as shown in FIGS. 7 (A) to (D), a front view, a plan view, a side view, and a rear view of the joining portion of the end portion of the cross member 5 to the vertical member 4 are formed in a flat plate shape. The stiffening member 40 is in a vertical posture parallel to the plane of the rigid frame 1, and one of the left and right plate portions 40 a, 40 b is connected to the vertical member 4 of the vertical member 4. The inner surface 4a is brought into surface contact and joined by welding. The other plate portion 40b is brought into surface contact with the outer surface of the web portion 5a, which is the side surface of the cross member 5, and is joined by welding.

  At both ends of the cross member 5, holes 7 for inducing shear yield are provided at locations where the web portion 5a is disengaged from the joint with the stiffening member 4. There are a plurality of shear yield-inducing holes 7 provided at each of the two ends of the cross member 5, and here, two holes 7 are arranged vertically. The number of the holes 7 may be one or more than three, and it is not always necessary to provide them.

  According to the ladder-shaped column 2 having this configuration, both ends of the cross member 5 are joined to the side surfaces of the cross member 5 in surface contact with each other via the stiffening member 40 that stiffens the cross member 5, and the vertical member 4. Therefore, it is possible to ensure the yield strength and rigidity of the end portion and the vicinity of the end portion. Further, the stiffening member 40 has a flat plate shape, and the portion where the stiffening member 40 of the longitudinal member 4 is joined becomes the surface 4a along the longitudinal direction of the transverse member 5, so that the longitudinal member 4 has a longitudinal direction. Unlike the case of joining to the vertical surface using the contact plate 6 (FIG. 2), the problem of out-of-plane deformation of the longitudinal member flange at the joining portion of the longitudinal member 4 is eliminated, and the proof stress is further improved. In joining using the backing plate 6 (FIG. 2), all-around welding around the backing plate 6 is required. However, the stiffening member 40 of this embodiment improves the manufacturability by avoiding all-around welding and reduces the cost. You can go down.

Further, even when the interval between the two vertical members 4 standing in parallel is wide, both ends of the horizontal member 5 are joined to the vertical member 4 via the stiffening member 40 as described above. A rigid region is provided in the vicinity of the end portion of 5, and the shear span of the cross member 5 can be reduced, so that the shear yield can be easily performed. Thereby, the stable energy absorption with respect to a vibration etc. can be performed.
That is, in the bending yield type, the energy absorption capability decreases as the loop repeats due to buckling of the compression side flange portion of the upper and lower flange portions 5b of the cross member 5 and vibration energy absorption at the welded portion. On the other hand, in the shear yield type of the web portion 5a, the yield of the plate element becomes dominant, and thus stable energy absorption is likely to occur.

Further, in this embodiment, as described above, the shear span of the cross member 5 becomes small due to the interposition of the stiffening member 40, and the shear yield is facilitated, and the shear yield inducing holes 7 are formed at both ends of the cross member 5. Therefore, the shear yield of the cross member 5 can be further promoted. Since the shear yield inducing hole 7 is provided in the web portion 3a of the cross member 3 that bears the shearing force, it is more effective in promoting shear yield. Further, since a plastic region is formed around the hole 7, the plastic deformation ability after the maximum proof stress is enhanced.
Further, since the holes 7 are provided at both ends of the cross member 5, plastic hinges are formed at both ends of the cross member 5, and the plastic deformation region becomes large. As a result, a deformation allowance at the time of large deformation can be earned and the plastic deformation ability can be improved.

  FIG. 8A is a schematic view of a cross member 5 provided with both ends of the shear yield-inducing hole 7 (here, one example of the hole 7), and a plastic hinge formed in that case. Is shown. FIG. 8B shows a cross member 5 in which the shear yielding hole 7 is provided in the center, and a schematic view of a plastic hinge formed in that case. As can be seen from these drawings, in the case of FIG. 8A in which the holes 7 are provided at both ends of the cross member 5, plastic hinges are formed at both ends of the cross member 5, so that the deformation allowance at the time of large deformation is large. Can earn. In the case of FIG. 8 (B) in which the hole 7 is provided in the center of the cross member 5, the plastic deformation region is limited, and the plastic deformation ability is inferior to that in the case of FIG. 8 (A).

  FIG. 9 shows a further different embodiment. This ladder-shaped column 2 is a surface 4b perpendicular to the construction surface of the longitudinal member 4 as the stiffening member 40A for stiffening the cross member 5 in the previous embodiment shown in FIGS. An L-shaped member is used that includes a plate portion 40Aa that is in surface contact with the outer surface of the cross member 5 and a plate portion 40Ab that is in surface contact with the outer surface of the web portion 5a. The stiffening member 40A may be an angle material or a bent product of a steel plate. FIGS. 9A to 9D are a front view, a plan view, a side view, and a rear view of the joint portion of the end of the cross member 5 to the vertical member 4 in this case. Other configurations are the same as those in the previous embodiment. Also, in this embodiment, the effect of preventing out-of-plane deformation of the longitudinal member 4 is lower than that of the previous embodiment, and the stiffening member 40A does not protrude from the surface parallel to the surface of the longitudinal member 4 in this embodiment. However, the other effects can be obtained as in the previous embodiment.

DESCRIPTION OF SYMBOLS 1 ... Ramen frame 2 ... Column 3 ... Beam 4 ... Vertical members 4a, 4b ... Surface 5 ... Cross member 5a ... Web part 7 ... Hole 17 for shear yield induction ... Bolt (medium bolt)
40, 40A ... stiffening members 40a, 40b, 40Aa, 40Ab ... plate part

Claims (10)

A frame structure of a building composed of two pillars and a beam spanned between the two pillars, each of the pillars comprising two parallel square steel pipes arranged in the direction in which the pillars are arranged. A ladder having a vertical member and a plurality of metal cross members laid up and down between the vertical members, a flange portion where the cross member is positioned above and below, and a web portion connected to the flange portions, The web portion and the plate portion on one side surface along the longitudinal direction of the cross member among the four side surface plate portions of the vertical member made of the rectangular steel pipe are close to each other. A ramen frame of a building characterized by A frame structure of a building composed of two pillars and a beam spanned between the two pillars, each of the pillars being made of two metal vertical parallel to each other in the direction in which the pillars are arranged. A ladder having a metal and a plurality of metal cross members laid side by side between the vertical members, and a flange portion in which the cross members are positioned vertically and a web portion connected to the flange portions. A ramen frame for a building, wherein both ends of each cross member are welded to the vertical member via a backing plate. 3. The building frame according to claim 1, wherein a shear yield-inducing hole is provided in the vicinity of the upper and lower flange portions of the web portion of the groove-shaped cross member. The building frame according to any one of claims 1 to 3 , wherein the beam is joined to both of the two vertical members of the pillars. In ramen Frames of any one of the buildings of claims 1 to 4, Ramen Frames of a building and the columns and beams are joined at medium volts.   2. The building frame according to claim 1, wherein both ends of the cross member of the column are joined to the two vertical members through stiffening members that stiffen the cross member, respectively. Is a frame structure for a building having a plate portion joined in surface contact with the surface of the longitudinal member and a plate portion joined in surface contact with the side surface of the cross member. The building rigid frame for a building according to claim 6 , wherein the stiffening member has a flat plate shape, the both plate portions of the stiffening member continue on the same plane, A ramen frame for a building joined to a surface parallel to the surface and the side surface of the cross member aligned in the same plane as the surface. The building rigid frame according to claim 6 , wherein the stiffening member is in surface contact with a surface of the vertical member that is perpendicular to the structural surface of the rigid frame, and the side surface of the transverse member. A ramen frame for a building that is L-shaped with a plate portion that is in surface contact with the frame. In ramen Frame building according to any one of claims 6 to 8, at a position out of the joint between the stiffening member at both end portions of the crosspiece, holes for the shear yield induction A ramen frame for the building. The building rigid frame for a building according to claim 9 , wherein there are a plurality of shear yield inducing holes provided at both ends of the cross member.

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