JP2015108274A - End structure of steel member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an end structure of a steel member having an H-shaped cross-section, when it is connected rigidly and orthogonally with another member, at a low cost, by simple means and ensuring plastic deformation performance of the end part of the steel member.SOLUTION: In a range of plasticization in the axial direction of a flange 1a of a steel member 1, which is assumed to plasticize due to an earthquake and other external forces, an out-of-plane deformation restraining member 5 is installed at the flange edge that restrains out-of-plane deformation of the flange 1a but not deformation of the flange 1a in the axial direction. Thus, the out-of-plane deformation restraining member 5 restrains out-of-plane deformation of the flange 1a but not deformation of the flange 1a in the axial direction. Thus, local buckling at the flange edge after plasticization may be controlled, securing the plastic deformation performance.

Description

  The present invention relates to an end structure of a steel member when a steel member having an H-shaped cross section is joined so as to be orthogonal to another member.

  In recent years, the strength class of steel materials used in building structures is the conventional 490N class due to the rise in building structures and the increase in scale, and the inflation of design seismic forces assumed from the frequent occurrence of large-scale earthquakes in recent years. From the viewpoint of economy, it is desired to reduce the size of the cross section of the member by increasing the strength of the steel material. When applying such high-strength steel and reducing the cross-sectional size to a steel member, there is a technical problem in securing the plastic deformation performance of the steel member that affects the seismic performance of the structure.

  That is, taking an H-shaped cross-section bending member constituting a structure as an example, a plastic deformation ratio η representing a plastic deformation performance capable of bending deformation with a certain bending strength even after the end of the member starts yielding. Is well known to have a negative correlation with the width / thickness ratio of the member (for example, the ratio of the flange width to the plate thickness of the H-shaped cross section) and the square root of the yield strength F of the steel material. Strengthening and slimming of the cross section tend to lower the plastic deformation performance of the member.

  In order to secure the plastic deformation capacity of the steel beam, it is necessary to ensure plastic deformation by stable bending near the end of the member. However, the member end of the steel beam must be stiffened or reinforced to ensure the earthquake resistance of the frame. As techniques for increasing the above, those described in Patent Documents 1 and 2 are known.

  In the technique described in Patent Document 1, a reinforcing metal is attached to the flange at the end of the beam, shear force is transmitted between the reinforcing metal and the beam, and the bending moment on the beam side is reduced. By transmitting the transmitted shearing force to the side of the column with the lever reaction force via the rib, the reinforcing metal member transmits the bending moment reduced on the beam side to the column.

  In the technique described in Patent Document 2, a stiffening plate is welded between a beam flange made of H-shaped steel and a horizontal diaphragm, and the welded portion of the stiffening plate is used as a tensile force from the beam of H-shaped steel. On the other hand, the axial stress of the beam flange to which the stiffening plate is attached is reduced by providing a shearing force in the welding length direction along the beam axis direction of the welded portion between the horizontal diaphragm and the beam flange.

JP 2010-13451 A JP 2001-288823 A

In any of the techniques described in Patent Documents 1 and 2, the effect of improving the bending strength of the beam member end is expected, but the plastic deformation performance of the stiffened or reinforced portion is improved. is not.
In the event of an earthquake, the current principle of seismic design is to absorb the input energy to the structure by plastic deformation of the member. However, in the above technology, plasticization is only suppressed by stiffening or reinforcing the beam end. Therefore, the above-described problems cannot be solved with respect to a member whose strength is increased and the cross section is reduced. That is, the plastic deformation performance of the steel member that affects the seismic performance of the structure cannot be sufficiently ensured.

  The present invention has been made in view of the above circumstances, and when a steel member having an H-shaped cross section is rigidly joined so as to be orthogonal to other members, the steel member having high strength and a slimmed shape are obtained. Even when the cross section is applied, an object is to provide an end structure of a steel member that can secure the plastic deformation performance of the end of the steel member with low cost and simple means.

In order to achieve the above object, the end structure of the steel member of the present invention is the end of the steel member when a steel member having an H-shaped cross section is rigidly joined so as to be orthogonal to other members. A partial structure,
In the range of the axial direction of the flange of the steel member assumed to be plasticized by an external force such as an earthquake, the flange is restrained from out-of-plane deformation at least at the flange edge and is deformed in the axial direction of the flange. An out-of-plane deformation restraining member that is not restrained is provided.

Here, the range in which the plasticization is assumed is, for example, when the steel member is a steel beam or a steel column, from the end of the steel beam or the steel column to L / 10 or 2d or more. It is about a part.
Here, L is the length of the steel column or steel beam, and d is the maximum beam formation of the steel beam or the maximum diameter of the steel column.
Moreover, the axial direction of a flange means the axial direction along the longitudinal direction of steel members, such as a steel beam and a steel column.
Further, the out-of-plane deformation restraining member may be provided at least at the flange edge, and may be provided so as to cover the upper and lower surfaces of the flange.
In addition, since making the length of the out-of-plane deformation restraining member significantly larger than the range in the axial direction of the steel member that is supposed to be plasticized decreases the economic efficiency of the invention, usually, It is sufficient that the upper limit is a length obtained by adding d to a range in which plasticization is assumed.

Assuming that a frame structure having a steel structure with an H-shaped cross section as a beam and rigidly joined to a steel column as another member is subjected to seismic force, the moment of the beam end increases and the design seismic force is assumed. Within a range, a certain range at the end of the beam is plasticized and absorbs energy. At this time, due to the bending moment, either the upper end or the lower end of the beam is plasticized by receiving the compressive force due to the bending, but if there is no out-of-plane deformation restraining member as in the present invention, a plate is attached to the flange. Since there is no deformation constraint (out-of-plane deformation constraint) in the thickness direction, local buckling occurs early and stress decreases, so the bending moment that can be borne by the beam decreases and the plastic deformation ratio η of the beam decreases. .
As described above, this phenomenon occurs earlier as the yield strength F of the steel member and the width-to-thickness ratio of the flange increase, and the reduction in the plastic deformation ratio η of the beam becomes more significant.

On the other hand, in the present invention, in the axial range of the flange of the steel member assumed to be plasticized by an external force such as an earthquake, the flange is restrained from being deformed out of plane at least at the flange edge. An out-of-plane deformation restraining member that does not restrain deformation in the axial direction is provided, and the out-of-plane deformation restraining member restrains deformation in the plate thickness direction (out-of-plane deformation) at least at the flange edge, Since the deformation in the axial direction is not constrained, energy is absorbed by the plastic deformation in the axial direction of the flange, so that local buckling after plasticization can be suppressed, and stress reduction due to local buckling is suppressed. it can.
Therefore, the plastic deformation ratio η of the steel member can be increased, and the plastic deformation performance of the steel member can be achieved by a low-cost and simple means even when the steel member having a high strength and the slimmed cross section are applied. As a result, seismic performance can be improved.

  The said structure of this invention WHEREIN: It is preferable that the said out-of-plane deformation | transformation restraint member is not being fixed to the said other member.

According to such a configuration, it is possible to attach the out-of-plane deformation restraining member regardless of the shape of the joint portion of the other member orthogonal to the steel member, while preceding the joining of the steel member and the other member. It is possible to attach an out-of-plane deformation restraining member to a steel member. It can be attached to other members such as pillars by welding in the same manner as steel members such as straight beams.
Therefore, unlike the technique described in Patent Document 2, welding in the beam material axial direction of the stiffening panel and welding to the orthogonal column members are not required, and the construction becomes easy.

Further, in the configuration of the present invention, the out-of-plane deformation restraining member has a substantially U-shaped groove portion engaged with the flange edge end portion,
It is preferable that the out-of-plane deformation restraining member is fixed to the flange at one axial position after the groove portion is engaged with the flange edge portion.

According to such a structure, an out-of-plane deformation | transformation restraint member can be made into the simple structure which has a cross-sectional substantially U-shaped groove part engaged with a flange edge part.
In addition, since the out-of-plane deformation restraining member is fixed to the flange at one location in the axial direction of the steel member, it is prevented from falling off from the flange edge when receiving an earthquake force. Since both sides can restrain the out-of-plane deformation of the flange and do not restrain the axial deformation of the steel member of the flange, it is possible to suppress the occurrence of local buckling after plasticization occurs with a simple configuration, Stress reduction due to local buckling can be suppressed.

Further, it is preferable that the groove is configured such that a certain amount of clearance is allowed between the groove edge and the flange edge when the groove is engaged with the flange edge. That is, the groove width is preferably a groove width that can be engaged even by human power. This eliminates the need for an operation of hitting and fitting the out-of-plane deformation restraining member to the edge of the flange, so that it can be easily attached, so that it is easy to install the out-of-plane deformation restraining member in the factory or at the site. Become.
In addition, the out-of-plane deformation restraining member needs to restrain deformation in the plate thickness direction (out-of-plane direction) of the flange edge, and therefore has sufficient bending rigidity in the plate thickness direction (out-of-plane direction). There is a need. The bending rigidity of the out-of-plane deformation restraining member can be adjusted by the cross-sectional shape (width and height) of the out-of-plane deformation restraining member. The material of the out-of-plane deformation restraining member is most suitable in terms of manufacturing, availability and economy, but the plate at the flange edge is being plasticized while the end of the steel member is plasticized by the bending moment. If a function capable of suppressing deformation in the thickness direction (out-of-plane direction) can be exhibited, other materials (resins and the like) can be applied.

Further, in the configuration of the present invention, the out-of-plane deformation restraining member includes two engaging portions each having a substantially U-shaped groove portion that engages with both flange end portions of the flange, and the two engaging portions. Part formed integrally with the web of the flange and the connecting part connecting on the opposite surface,
The out-of-plane deformation restraining member may be attached to the flange by engaging the groove portions of both engaging portions with the flange edge portions.

  According to such a configuration, since the out-of-plane deformation restraining member is attached to the flange by engaging the groove portions of the both engaging portions with the flange edge portions, the out-of-plane deformation restraining member is attached to the flange. Even if it is not fixed to the flange, it is possible to prevent the out-of-plane deformation restraining member from falling off the flange edge when receiving an earthquake force.

  According to the present invention, even when a steel member having a high strength and a slimmed cross section are applied, the plastic deformation performance of the steel member can be ensured by a low-cost and simple means.

The 1st Embodiment of the edge part structure of the steel member which concerns on this invention is shown, (a) is the side view, (b) is sectional drawing. It is a figure for demonstrating the method to attach an out-of-plane deformation | transformation restraint member to a flange edge part. It is sectional drawing which shows the cross section of a multiple types of out-of-plane deformation | transformation restraint member with a flange, (a) is sectional drawing of what was integrally formed with steel materials, (b) and (c) join two types of steel materials, respectively. It is sectional drawing of what was formed by doing. It is sectional drawing which shows 2nd Embodiment of the edge part structure of the steel member which concerns on this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(First embodiment)
FIG. 1 shows an end structure of a steel member according to the first embodiment. FIG. 1 (a) is a side view of the joining structure, and FIG. 1 (b) is a sectional view of the end structure. is there.

In the present embodiment, a steel member having an H-shaped cross section is a steel beam 1, and another member that joins the steel beam 1 is a steel column 2.
The steel beam 1 is integrally formed from upper and lower flanges 1a and 1a and a web 1b connecting the flanges 1a and 1a.
The steel column 2 is a steel tube column formed in a square tube shape, and horizontal diaphragms 2a and 2a are provided at predetermined intervals (interval between the flanges 1a and 1a) at a portion where the steel beam 1 is to be joined. It has been. The horizontal diaphragm 2 a is formed to have a larger diameter than the steel column 2, and the outer peripheral portion thereof protrudes from the outer peripheral surface of the steel column 2.

  The end of the steel beam 1 is rigidly joined to the steel column 2 by welding. That is, the end faces of the flanges 1a and 1a of the steel beam 1 are abutted against the side end faces of the horizontal diaphragms 2a and 2a, and then joined to the side end faces by welding. Further, the end surface of the web 1b of the steel beam 1 is abutted against the side surface of the steel column 2 between the horizontal diaphragms 2a and 2a, and is joined to the side surface by welding.

  Further, in the axial range of the flange 1a of the steel beam 1 assumed to be plasticized by an external force such as an earthquake, the flange 1a is constrained from the out-of-plane deformation of the flange 1a and the flange 1a is deformed in the axial direction. An out-of-plane deformation restraining member 5 that does not restrain the surface is provided. This out-of-plane deformation restraining member 5 is provided at both flange edge ends of the upper and lower flanges 1 a, 1 a, and a total of four out-of-plane deformation restraining members 5 are provided at the ends of the steel beam 1.

Here, the range in which the plasticization is assumed is about a portion from the beam end of the steel beam 1 to L / 10 or 2d or more. Here, L is the length of the steel beam, and d is the maximum beam formation of the steel beam.
As shown in FIG. 1, the out-of-plane deformation restraining member 5 is provided so as to substantially coincide with a range A in which plasticization is assumed. Further, there is a predetermined gap between the end of the out-of-plane deformation restraining member 5 on the steel column 2 side and the horizontal diaphragm 2 a, and the out-of-plane deformation restraining member 5 is connected to the horizontal diaphragm 2 a, that is, the steel column 2. It is not fixed.

The out-of-plane deformation restraining member 5 is a member having a rectangular cross section formed by a steel material along the axial direction (length direction) of the steel beam 1, and a groove portion having a substantially U-shaped cross section on one side surface thereof. 6. The groove 6 is set so that the distance between the opposing side surfaces is approximately equal to or slightly larger than the thickness of the flange 1a so as to be engaged with the flange edge of the flange 1a.
Such an out-of-plane deformation restraining member 5 is fixed to the flange 1a at one axial position of the steel beam 1 after the groove 6 is engaged with the flange edge.

When fixing the out-of-plane deformation restraining member 5 to the flange 1a, there are a plurality of methods as follows.
In the first method, as shown in FIG. 2 (a), a through-hole 5 a reaching the groove 6 is formed on the side surface facing the outside of the out-of-plane deformation restraining member 5, and that portion is flanged by plug welding 7. It is a method to fix to.
In the second method, as shown in FIG. 2 (b), a through hole 5a reaching the groove 6 is formed on a side surface facing the outside of the out-of-plane deformation restraining member 5, and a stud bolt or a fixing is formed through the through hole 5a. In this method, the bolt 8 is screwed into the flange 1a and fixed to the flange 1a.

In the third method, as shown in FIG. 2 (c), a through hole 5 b reaching the groove 6 is formed on the upper surface or the lower surface of the out-of-plane deformation restraining member 5, and that portion is formed on the flange 1 a by plug welding 7. It is a method of fixing.
In the fourth method, as shown in FIG. 2 (d), a through hole 5a reaching the groove portion 6 is formed on the side surface facing the outside of the out-of-plane deformation restraining member 5, and a stud bolt or a fixing is formed through the through hole 5a. In this method, the bolt 8 is screwed into the flange 1 a, and a through hole 5 b reaching the groove 6 is formed on the upper surface or the lower surface of the out-of-plane deformation restraining member 5, and that portion is fixed to the flange 1 a by plug welding 7.

Such a fixing method can be carried out at a steel frame manufacturing factory or a construction site, and is excellent in workability in that it does not require special factory equipment and materials.
In addition, the out-of-plane deformation restraining member 5 cannot exhibit its original function of absorbing energy by stable plastic deformation of the member by suppressing local buckling unless the plasticization in the axial direction of the flange 1a is inhibited. Therefore, the attachment of the out-of-plane deformation restraining member 5 to the flange 1a needs to avoid fixing at two or more locations in the axial direction of the flange 1a or fixing by linear continuous welding. Therefore, the out-of-plane deformation restraining member 5 is fixed only in one cross section in the axial direction by combining any one of the edge of the flange edge of the flange 1a, the front surface or the back surface, or a combination thereof.

Moreover, although the said out-of-plane deformation | transformation restraint member 5 was formed by forming the groove part 6 in the side surface of a long steel material with a rectangular cross section, as shown to Fig.3 (a), it is not restricted to this.
For example, as shown in FIG. 3 (b), two long rectangular steel members 5d and 5d having a rectangular cross section are spaced apart from each other by the thickness of the flange 1a on the side surface of the long steel member 5c having a rectangular cross section. It may be fixed by welding or the like.
In this case, as shown in FIG. 3 (c), the upper surface of the steel material 5d may be flush with the upper surface of the steel material 5c, and the steel materials 5d, 5d may be fixed to the steel material 5c by welding or the like. . This makes it possible to reduce the upward protruding length from the flange 1a, which is advantageous when a floor slab or the like is installed on the flange 1a.

As described above, according to the present embodiment, in the axial range of the flange 1a of the steel beam 1 assumed to be plasticized by an external force such as an earthquake, the flange 1a is subjected to out-of-plane deformation at the flange edge. Since the out-of-plane deformation restraining member 5 that restrains and does not restrain the deformation of the flange 1a in the axial direction is provided, the out-of-plane deformation restraining member 5 deforms in the plate thickness direction (out-of-plane deformation) at the flange edge. ) Is restrained, and deformation of the flange 1a in the axial direction is not restrained. Therefore, energy is absorbed by the plastic deformation of the flange 1a in the axial direction, and the occurrence of local buckling after the plasticization occurs can be suppressed, and the stress reduction accompanying the local buckling can be suppressed.
Therefore, the plastic deformation magnification η of the steel beam 1 can be increased, and even when the steel beam 1 having a higher strength and the slimmed cross section are applied, the steel beam 1 can be reduced by a low-cost and simple means. The plastic deformation performance can be secured, and as a result, the seismic performance can be improved.

Further, since the out-of-plane deformation restraining member 5 is not fixed to the steel column 2, the out-of-plane deformation restraining member 5 can be attached regardless of the shape of the joint with the steel column 2. Since it is possible to attach the out-of-plane deformation restraining member 5 to the steel beam 1 prior to the joining of the beam 1 and the steel column 2, the out-of-plane deformation restraining member 5 precedes the steel beam 1 at a factory, for example. It is also possible to attach what has been attached to the steel column 1 by welding in the same manner as a general beam or the like at a construction site or the like.
Therefore, unlike the technique described in Patent Document 2, welding in the beam material axial direction of the stiffening panel and welding to the orthogonal column members are not required, and the construction becomes easy.

  Further, since the out-of-plane deformation restraining member 5 has a simple configuration having the groove portion 6, it is easy to manufacture and the like, and after the groove portion 6 is engaged with the flange edge, the steel beam 1 is attached to the flange 1a. Since the out-of-plane deformation restraining member 5 is prevented from falling off from the flange edge when subjected to seismic force, the flange 1 a While being able to constrain out-of-plane deformation and not constraining deformation in the axial direction of the steel beam 1 of the flange 1a, it is possible to suppress the occurrence of local buckling after plasticization has occurred with a simple configuration, and local buckling. It is possible to suppress the stress reduction associated with.

Further, since the groove 6 has a groove width that can be engaged with the flange edge by human power, it does not require an operation of hitting and fitting the out-of-plane deformation restraining member 5 to the flange edge, Since the attachment can be easily performed, the attachment work of the out-of-plane deformation restraining member 5 in the factory or the field becomes easy.
Furthermore, since the out-of-plane deformation restraining member 5 has sufficient bending rigidity with respect to the out-of-plane direction of the flange 1a, the out-of-plane deformation restraining member 5 reliably restrains deformation in the plate thickness direction (out-of-plane direction) of the flange edge. be able to.

(Second Embodiment)
FIG. 4 is a cross-sectional view showing an end structure of a steel member according to the second embodiment.
In the present embodiment, as in the first embodiment, the steel beam 1 having an H-shaped cross section is joined to the steel column 2 by welding.
Since this embodiment differs from the first embodiment in the configuration of the out-of-plane deformation restraining member, this point will be described in detail below, and the same configuration as the first embodiment is the same. The description is omitted or simplified with reference numerals.

  In the present embodiment, the out-of-plane deformation restraining member 10 connects two engaging portions 10a and 10a on the left and right sides, and connects these engaging portions 10a and 10a on the surface opposite to the web 1b of the flange 1a. The part 10b is integrally formed of a steel material.

The engaging portion 10a has a groove portion 11 having a substantially U-shaped cross section that engages with the flange edge. The groove width of the groove 11 is set to be approximately equal to or slightly larger than the thickness of the flange 1a.
The connecting portion 10b is formed in a flat plate shape, and its length (the length in the direction orthogonal to the paper surface in FIG. 4) is equal to the engaging portion 10a.

Such an out-of-plane deformation restraining member 10 is attached to the flange 1a by engaging the groove portions 11, 11 of the engaging portions 10a, 10a with the flange edge portions, respectively.
When attaching the out-of-plane deformation restraining member 10 to the flange 1a, the out-of-plane deformation restraining member 10 is inserted into the groove 11 from the end side of the steel beam 1 before being joined to the steel column 2 in a factory or the field. , 11a is engaged by extrapolation so as to engage the flange edge.
In the factory, when attaching the out-of-plane deformation restraining member 10 to the flange 1a, the out-of-plane deformation restraining member 10 is temporarily fixed at a predetermined position, and after joining the steel beam 1 to the steel pillar 2 at the site, Alternatively, before joining, the out-of-plane deformation restraining member 10 may be fixed to the flange 1a by spot welding or the like at one axial position within a range where plasticization is expected by an external force such as an earthquake.
Further, if the out-of-plane deformation restraining member 10 is engaged with the flange 1a so as not to be displaced in the axial direction of the steel beam 1 by an external force such as an earthquake, the out-of-plane deformation restraining member 10 is Since it is only necessary to attach to the range where plasticization is assumed by an external force and it is not necessary to fix by welding or the like, the labor of construction can be saved accordingly.

  According to the present embodiment, the same effects as those of the first embodiment can be obtained, and the out-of-plane deformation restraining member 10 can use the groove portions 11 and 11 of both engaging portions 10a and 10a as flange edge portions, respectively. Since it is attached to the flange 1a by engaging, even if the out-of-plane deformation restraining member 10 is not fixed to the flange 1a, the out-of-plane deformation restraining member 10 is subjected to the flange edge when receiving an earthquake force. Can be prevented from falling off.

In the present embodiment, the out-of-plane deformation restraining member 10 is integrally formed by two engaging portions 10a and 10a on both the left and right sides and a connecting portion 10b that connects these engaging portions 10a and 10a. This is not a limitation. For example, the engaging portions 10a and 10a on both the left and right sides are separately manufactured, and the end portions of the connecting portions 10b that are separately manufactured are welded to the engaging portions 10a and 10a. May be integrated.
Further, by engaging the groove portions 11 and 11 of the separately produced engaging portions 10a and 10a with the flange edge portions, respectively, the engaging portions 10a and 10a are attached in advance to the flange 1a. The out-of-plane deformation restraining member 10 may be integrated by welding and joining the end portions of the joint portions 10b separately manufactured to the engaging portions 10a and 10a.

Further, in the first and second embodiments, the out-of-plane deformation restraining members 5 and 10 are provided with the groove portions 6 and 11 that engage with the flange edge end portions. As long as it restrains the out-of-plane deformation of the flange 1a and does not restrain the deformation of the flange 1a in the axial direction, the groove portion or the like may be omitted.
For example, an out-of-plane deformation restraining member is brought into contact with the upper and lower surfaces of the flange 1a, and a pair of upper and lower abutting members restraining the out-of-plane deformation of the flange 1a, and these abutting members are connected in the axial direction of the flange 1a. You may comprise from the fixing member which can be fixed to the flange 1a in the place. As a fixing member, for example, a bolt is passed through one abutting member, a flange is penetrated, and further, the other abutting member is penetrated, and then a nut is screwed into the bolt and tightened. Also good.
Further, in the first and second embodiments, the gaps 6 and 11 and the edge of the flange 1a are prevented from being restrained by the out-of-plane deformation restraining members 5 and 10 in the axial direction of the flange. Further, a sliding layer such as a Teflon (registered trademark) sheet may be interposed.

1 Steel beam (steel member)
2 Steel pillars (other members)
5,10 Out-of-plane deformation restraining member 6,11 Groove portion 10a Engaging portion 10b Connecting portion

Claims (4)

The steel member having an H-shaped cross section is an end structure of the steel member when rigidly joined so as to be orthogonal to other members,
In the range of the axial direction of the flange of the steel member assumed to be plasticized by an external force such as an earthquake, the flange is restrained from out-of-plane deformation at least at the flange edge and is deformed in the axial direction of the flange. An end structure of a steel member, wherein an out-of-plane deformation restraining member that is not restrained is provided.   The end structure of the steel member according to claim 1, wherein the out-of-plane deformation restraining member is not fixed to the other member. The out-of-plane deformation restraining member has a groove portion having a substantially U-shaped cross section engaged with the flange edge portion,
The said out-of-plane deformation | transformation restraint member is being fixed to the said flange at one place of the axial direction, after the groove part is engaged with the said flange edge part. End structure of steel member. The out-of-plane deformation restraining member includes two engaging portions each having a substantially U-shaped groove portion engaged with both flange end portions of the flange, and the two engaging portions on the opposite side of the flange web. It is integrally formed with the connecting part that connects on the surface of
The said out-of-plane deformation | transformation restraint member is attached to the said flange by each engaging the groove part of the both engaging parts with the said flange edge part, The Claim 1 or 2 characterized by the above-mentioned. End structure of steel member.

Images