JP2018059334A

JP2018059334A - Steel member

Info

Publication number: JP2018059334A
Application number: JP2016197873A
Authority: JP
Inventors: 明良彦坂; Akira Hikosaka; 冨村　宏紀; Hiroki Tomimura; 宏紀冨村
Original assignee: Nisshin Steel Co Ltd
Current assignee: Nippon Steel Nisshin Co Ltd
Priority date: 2016-10-06
Filing date: 2016-10-06
Publication date: 2018-04-12

Abstract

PROBLEM TO BE SOLVED: To provide a steel member capable of preventing lateral buckling while reducing manufacturing time and cost.SOLUTION: A steel member 100 is provided with a pair of flanges 11a, 11b opposing each other, a pair of reinforcement plates 12a, 12b disposed between the pair of the flange 11a,11b and extending in a longitudinal direction. The total length of each of connecting lines A1 and A2 formed by connecting the pair of the reinforcement plates 12a,12b to one flange 11a of the pair of the flanges 11a,11b is longer than any longitudinal length L of both flanges 11a,11b. In this way, a supporting portion of the reinforcement plate 12 to the pair of the flanges 11a,11b is much longer to allow the steel member 100 to be reinforced without any additional stiffener, so that manufacturing time and cost for the steel member 100 is reduced.SELECTED DRAWING: Figure 1

Description

この発明は、鋼製部材に関する。 The present invention relates to a steel member.

構造物の柱材、梁材として使用される鋼製部材としてＨ形鋼がある。Ｈ形鋼を補強するためには、特許文献１及び特許文献２に示すように、ウェブ板にはスチフナが設けられる。特に、Ｈ形鋼を梁材として使用する時は、ウェブ板にスチフナを設けることでＨ形鋼の横座屈が防止される。 There is an H-shaped steel as a steel member used as a pillar or beam of a structure. In order to reinforce the H-shaped steel, as shown in Patent Literature 1 and Patent Literature 2, a stiffener is provided on the web plate. In particular, when H-shaped steel is used as a beam material, lateral buckling of the H-shaped steel is prevented by providing a stiffener on the web plate.

特開２００４−３５１４３８号公報JP 2004-351438 A 特開２０１５−１０５５４３号公報Japanese Patent Laying-Open No. 2015-105543

しかしながら、より確実に横座屈を防止するためには、図９に示すように鋼製部材１０１のウェブ１１２に複数のスチフナ１１３を一定間隔に取り付ける必要があり、手間がかかっていた。また、特許文献１及び２に示すような鋼製部材のスチフナはＨ形鋼の製造後、別工程で１つ１つ取り付けられるため、製造にかかるコストと時間がさらに嵩んでいた。 However, in order to prevent lateral buckling more reliably, it is necessary to attach a plurality of stiffeners 113 to the web 112 of the steel member 101 at regular intervals as shown in FIG. Moreover, since the stiffeners of steel members as shown in Patent Documents 1 and 2 are attached one by one in a separate process after the manufacture of the H-shaped steel, the cost and time required for the manufacture are further increased.

この発明は、このような問題を解決するためになされ、製造に係る時間とコストを抑えつつ、横座屈を防止することができる鋼製部材を提供することを目的とする。 This invention is made in order to solve such a problem, and it aims at providing the steel member which can prevent a lateral buckling, suppressing the time and cost concerning manufacture.

上記の課題を解決するために、この発明に係る鋼製部材は、互いに対向する一対のフランジと、一対のフランジの間に設けられる少なくとも１つの補強板部とを備え、一対のフランジのうちのいずれか１つのフランジと補強板部とが接続する接続線の長さの合計は、一対のフランジのうちのどのフランジの長手方向の長さよりも長い。 In order to solve the above-described problems, a steel member according to the present invention includes a pair of flanges facing each other and at least one reinforcing plate portion provided between the pair of flanges. The sum total of the length of the connection line which any one flange and a reinforcement board part connect is longer than the length of the longitudinal direction of any flange of a pair of flanges.

この発明に係る鋼製部材の一対のフランジの間には、互いに対向して長手方向に延びる２つの補強板部が設けられていてもよい。 Between the pair of flanges of the steel member according to the present invention, two reinforcing plate portions that are opposed to each other and extend in the longitudinal direction may be provided.

接続線は曲線形状であってもよい。
また、接続線は少なくとも２つの直線部分を有する折線形状であってもよい。 The connecting line may have a curved shape.
Further, the connecting line may have a broken line shape having at least two straight portions.

この発明に係る鋼製部材によれば、製造に係る時間とコストを抑えつつ、横座屈を防止する。 According to the steel member according to the present invention, lateral buckling is prevented while suppressing manufacturing time and cost.

この発明の実施の形態１に係る鋼製部材を示す斜視図である。It is a perspective view which shows the steel member which concerns on Embodiment 1 of this invention. 図１に示す鋼製部材を示す平面図である。It is a top view which shows the steel members shown in FIG. この発明の実施の形態２に係る鋼製部材を示す斜視図である。It is a perspective view which shows the steel members which concern on Embodiment 2 of this invention. 図３に示す鋼製部材を示す平面図である。It is a top view which shows the steel members shown in FIG. この発明の実施の形態３に係る鋼製部材を示す斜視図である。It is a perspective view which shows the steel members which concern on Embodiment 3 of this invention. 図５に示す鋼製部材を示す平面図である。It is a top view which shows the steel members shown in FIG. この発明の実施の形態４に係る鋼製部材を示す斜視図である。It is a perspective view which shows the steel members which concern on Embodiment 4 of this invention. 図７に示す鋼製部材を示す平面図である。It is a top view which shows the steel members shown in FIG. 従来の例に係る鋼製部材を示す斜視図である。It is a perspective view which shows the steel member which concerns on the conventional example.

以下、この発明の実施の形態について添付図面に基づいて説明する。
実施の形態１．
この発明の実施の形態１に係る鋼製部材１００の構成を図１及び２に示す。
図１に示すように、鋼製部材１００は、互いに対向する一対のフランジ１１ａ，１１ｂと、一対のフランジ１１ａ，１１ｂの間に設けられ、互いに対向するとともに鋼製部材１００の長手方向に延びる一対の補強板部１２ａ，１２ｂとを有する。一対の補強板部１２ａ，１２ｂは、一対のフランジ１１ａ，１１ｂの各々に対して直交するように接続されている。そして、図２に示すように、一対のフランジ１１ａ，１１ｂのうちの一方のフランジ１１ａと補強板部１２ａ，１２ｂとの接続箇所１３ａ，１３ｂは、破線で示すように、長手方向に直線的に延びる一対の細長帯形状をなす。接続箇所１３ａ，１３ｂは、フランジ１１ａの中心軸Ｃを挟んで互いに線対称に設けられる。ここで、接続箇所１３ａ，１３ｂの各々の中心線を、フランジ１１ａと補強板部１２ａ，１２ｂとの接続線Ａ１，Ａ２とする。そして、一対のフランジ１１ａ，１１ｂの長手方向長さ、すなわち鋼製部材１００の長手方向長さはＬであり、接続線Ａ１，Ａ２の長さもＬである。そのため、接続線Ａ１，Ａ２の長さの合計は２Ｌであり、一対のフランジ１１ａ，１１ｂの長手方向長さＬよりも長い。すなわち、接続線Ａ１，Ａ２の長さの合計は、一対のフランジ１１ａ，１１ｂのうちのどのフランジの長手方向長さよりも長い。
なお、反対側のフランジ１１ｂと補強板部１２ａ，１２ｂとの接続箇所及び接続線も、フランジ１１ａ側と同様の形状となる。
またここで、接続とは、部材同士が、例えば溶接により接合されていることを意味している。 Embodiments of the present invention will be described below with reference to the accompanying drawings.
Embodiment 1 FIG.
The structure of the steel member 100 according to Embodiment 1 of the present invention is shown in FIGS.
As shown in FIG. 1, the steel member 100 is provided between a pair of flanges 11 a and 11 b facing each other and a pair of flanges 11 a and 11 b, and faces each other and extends in the longitudinal direction of the steel member 100. Reinforcing plate portions 12a and 12b. A pair of reinforcement board part 12a, 12b is connected so that it may orthogonally cross with respect to each of a pair of flange 11a, 11b. As shown in FIG. 2, the connection portions 13a and 13b between one flange 11a of the pair of flanges 11a and 11b and the reinforcing plate portions 12a and 12b are linear in the longitudinal direction as indicated by broken lines. A pair of elongated strips is formed. The connection portions 13a and 13b are provided symmetrically with respect to each other across the central axis C of the flange 11a. Here, the center lines of the connection portions 13a and 13b are connection lines A1 and A2 between the flange 11a and the reinforcing plate portions 12a and 12b. And the longitudinal direction length of a pair of flanges 11a and 11b, ie, the longitudinal direction length of the steel member 100, is L, and the lengths of the connection lines A1 and A2 are also L. Therefore, the total length of the connection lines A1 and A2 is 2L, which is longer than the longitudinal length L of the pair of flanges 11a and 11b. That is, the total length of the connection lines A1 and A2 is longer than the longitudinal length of any of the pair of flanges 11a and 11b.
In addition, the connection location and connection line of the flange 11b on the opposite side and the reinforcing plate portions 12a and 12b have the same shape as the flange 11a side.
Here, the connection means that the members are joined together by welding, for example.

以上より、この実施の形態１に係る鋼製部材１００において、フランジ１１ａと補強板部１２ａ，１２ｂとの接続線Ａ１，Ａ２の長さの合計は、フランジ１１ａ，１１ｂの長手方向の長さＬよりも長い。ここで、一般的なＨ形鋼のウェブの長手方向の長さは、フランジの長手方向の長さＬと同一か短い寸法となっている。これと比較して、補強板部１２ａ，１２ｂはフランジ１１ａ，１１ｂに対してより長い接続線Ａ１，Ａ２の長さを有している。そのため、補強板部１２ａ，１２ｂがフランジ１１ａ，１１ｂを支持する部分がより大きく、鋼製部材１００が補強され、横座屈が確実に防止される。また、ウェブに相当する部材を２枚設けて補強板部１２ａ，１２ｂとしているため、スチフナを新たに設ける必要がなく、鋼製部材１００を製造するコスト及び時間が短縮される。 As described above, in the steel member 100 according to the first embodiment, the total length of the connection lines A1 and A2 between the flange 11a and the reinforcing plate portions 12a and 12b is the length L in the longitudinal direction of the flanges 11a and 11b. Longer than. Here, the length in the longitudinal direction of a general H-shaped steel web is the same as or shorter than the length L in the longitudinal direction of the flange. In comparison, the reinforcing plate portions 12a and 12b have longer connection lines A1 and A2 than the flanges 11a and 11b. Therefore, the portions where the reinforcing plate portions 12a and 12b support the flanges 11a and 11b are larger, the steel member 100 is reinforced, and lateral buckling is reliably prevented. Further, since two members corresponding to the web are provided as the reinforcing plate portions 12a and 12b, it is not necessary to newly provide a stiffener, and the cost and time for manufacturing the steel member 100 are reduced.

実施の形態２．
この発明の実施の形態２に係る鋼製部材２００の構成を図３及び４に示す。なお、図１及び２の参照符号と同一の符号は同一又は同様の構成要素であるので、以下、その詳細な説明は省略する。
図３に示すように、鋼製部材２００は、互いに対向する一対のフランジ１１ａ，１１ｂの間に設けられ、波形状に湾曲する曲面を有する補強板部２２を有する。補強板部２２は、一対のフランジ１１ａ，１１ｂの各々に対して直交するように接続されている。そして、図４に示すように、一対のフランジ１１ａ，１１ｂのうちの一方のフランジ１１ａと補強板部２２との接続箇所２３は、破線で示すように、波状に湾曲しながら長手方向に延びる曲線状の細長帯形状をなす。ここで、接続箇所２３の中心線を、フランジ１１ａと補強板部２２との接続線Ａ３とする。接続線Ａ３はフランジ１１ａの幅方向に振幅する波状の曲線形状を描く。そのため、接続線Ａ３の長さは、鋼製部材２００の長手方向長さＬ、すなわち、一対のフランジ１１ａ，１１ｂのうちのどのフランジの長手方向長さよりも長い。
なお、反対側のフランジ１１ｂと補強板部２２との接続箇所及び接続線も、フランジ１１ａ側と同様の形状となる。 Embodiment 2. FIG.
The structure of the steel member 200 according to Embodiment 2 of the present invention is shown in FIGS. Note that the same reference numerals as those in FIGS. 1 and 2 are the same or similar components, and thus detailed description thereof will be omitted.
As shown in FIG. 3, the steel member 200 includes a reinforcing plate portion 22 that is provided between a pair of flanges 11 a and 11 b facing each other and has a curved surface that is curved in a wave shape. The reinforcing plate portion 22 is connected so as to be orthogonal to each of the pair of flanges 11a and 11b. And as shown in FIG. 4, the connection location 23 of one flange 11a of one pair of flanges 11a and 11b and the reinforcement board part 22 is a curve extended in a longitudinal direction, curving in a wave shape, as shown with a broken line. The shape of the elongated strip. Here, let the center line of the connection location 23 be the connection line A3 between the flange 11a and the reinforcing plate portion 22. The connection line A3 draws a wavy curved shape that swings in the width direction of the flange 11a. Therefore, the length of the connection line A3 is longer than the longitudinal length L of the steel member 200, that is, the longitudinal length of any of the pair of flanges 11a and 11b.
In addition, the connection location and connection line of the flange 11b on the opposite side and the reinforcement board part 22 also become a shape similar to the flange 11a side.

以上より、この実施の形態２に係る鋼製部材２００においては、鋼製部材１００と同様に、フランジ１１ａと補強板部２２との接続線Ａ３の長さは、フランジ１１ａ，１１ｂの長手方向の長さＬよりも長い。従って、一般的なＨ形鋼のウェブと比較して、補強板部２２はフランジ１１ａ，１１ｂをより長い接続線Ａ３を介して支持しており、鋼製部材２００の横座屈が確実に防止される。また、補強板部２２は、ウェブに相当する部材を湾曲させた形状のため、新たにスチフナを設ける必要がなく、鋼製部材２００を製造するコスト及び時間が短縮される。 As described above, in the steel member 200 according to the second embodiment, the length of the connection line A3 between the flange 11a and the reinforcing plate portion 22 is in the longitudinal direction of the flanges 11a and 11b, as in the steel member 100. Longer than length L. Therefore, compared with a general H-shaped steel web, the reinforcing plate portion 22 supports the flanges 11a and 11b via the longer connection line A3, and the lateral buckling of the steel member 200 is reliably prevented. The Moreover, since the reinforcement board part 22 is the shape which curved the member corresponded to a web, it is not necessary to provide a stiffener newly, and the cost and time which manufacture the steel member 200 are shortened.

実施の形態３．
この発明の実施の形態３に係る鋼製部材３００の構成を図５及び６に示す。
図５に示すように、鋼製部材３００は、互いに対向する一対のフランジ１１ａ，１１ｂの間に設けられる補強板部３２を有する。補強板部３２は鋼板が折り曲げられて加工されたものであり、補強板部３２には、鋼製部材３００の長手方向に延びる８枚の縦板部３２ａと、鋼製部材３００の幅方向に延びる７枚の横板部３２ｂとが一体的に形成されている。８枚の縦板部３２ａと７枚の横板部３２ｂとは、互い違いになるように交互に設けられ、隣り合う各々の縦板部３２ａと横板部３２ｂとは互いに直角に交わるような角度で配置される。さらにまた、補強板部３２は、一対のフランジ１１ａ，１１ｂの各々に対して直交するように接続される。また、図６に示すように、一対のフランジ１１ａ，１１ｂのうちの一方のフランジ１１ａと補強板部３２との接続箇所３３は、破線で示すように、凹凸状に折れ曲がった折線状の細長帯形状をなす。ここで、接続箇所３３の中心線を、フランジ１１ａと補強板部３２との接続線Ａ４とする。接続線Ａ４は１５辺の直線部分を有する折線形状をなしている。そして、各々の縦板部３２ａの接続線Ａ４の長手方向の長さはＤ１であり、各々の横板部３２ｂの接続線Ａ４の幅方向の長さはＤ２である。また、各々の縦板部３２ａの接続線Ａ４の長手方向の長さＤ１はＬ／８である。そのため、接続線Ａ４の長さの合計は８×Ｄ１＋７×Ｄ２＝Ｌ＋７×Ｄ２となり、一対のフランジ１１ａ，１１ｂの長手方向長さＬよりも長い。すなわち、接続線Ａ４の長さの合計は、一対のフランジ１１ａ，１１ｂのうちのどのフランジの長手方向長さよりも長い。 Embodiment 3 FIG.
The structure of the steel member 300 according to Embodiment 3 of the present invention is shown in FIGS.
As shown in FIG. 5, the steel member 300 has a reinforcing plate portion 32 provided between a pair of flanges 11a and 11b facing each other. The reinforcing plate portion 32 is formed by bending a steel plate. The reinforcing plate portion 32 includes eight vertical plate portions 32 a extending in the longitudinal direction of the steel member 300 and the width direction of the steel member 300. Seven extending horizontal plate portions 32b are integrally formed. The eight vertical plate portions 32a and the seven horizontal plate portions 32b are alternately provided so as to be alternated, and the adjacent vertical plate portions 32a and the horizontal plate portions 32b are at angles that intersect each other at right angles. It is arranged with. Furthermore, the reinforcement board part 32 is connected so that it may orthogonally cross with respect to each of a pair of flange 11a, 11b. Moreover, as shown in FIG. 6, the connection part 33 of one flange 11a of the pair of flanges 11a and 11b and the reinforcing plate portion 32 is a fold-like elongated band that is bent into a concavo-convex shape as shown by a broken line. Make a shape. Here, let the center line of the connection location 33 be the connection line A4 between the flange 11a and the reinforcing plate portion 32. The connection line A4 has a broken line shape having a straight portion of 15 sides. The length in the longitudinal direction of the connection line A4 of each vertical plate portion 32a is D1, and the length in the width direction of the connection line A4 of each horizontal plate portion 32b is D2. The length D1 in the longitudinal direction of the connection line A4 of each vertical plate portion 32a is L / 8. Therefore, the total length of the connection line A4 is 8 × D1 + 7 × D2 = L + 7 × D2, which is longer than the longitudinal length L of the pair of flanges 11a and 11b. That is, the total length of the connection line A4 is longer than the longitudinal length of any of the pair of flanges 11a and 11b.

以上より、この実施の形態３に係る鋼製部材３００においても、鋼製部材１００，２００と同様に、フランジ１１ａと補強板部３２との接続線Ａ４の長さは、フランジ１１ａ，１１ｂの長手方向長さＬよりも長い。従って、一般的なＨ形鋼のウェブと比較して、補強板部３２はフランジ１１ａ，１１ｂをより長い接続線Ａ４を介して支持しており、鋼製部材３００の横座屈が防止される。また、補強板部３２は、ウェブに相当する部分に凹凸を設けた形状のため、新たにスチフナを設ける必要がなく、鋼製部材３００を製造するコスト及び時間が短縮される。 As described above, also in the steel member 300 according to the third embodiment, the length of the connection line A4 between the flange 11a and the reinforcing plate portion 32 is the length of the flanges 11a and 11b, as in the steel members 100 and 200. It is longer than the direction length L. Therefore, compared with a general H-shaped steel web, the reinforcing plate portion 32 supports the flanges 11a and 11b via the longer connection line A4, and the lateral buckling of the steel member 300 is prevented. Further, since the reinforcing plate portion 32 has a shape corresponding to the web and provided with irregularities, it is not necessary to newly provide a stiffener, and the cost and time for manufacturing the steel member 300 are reduced.

実施の形態４．
この発明の実施の形態４に係る鋼製部材４００の構成を図７及び８に示す。
図７に示すように、鋼製部材４００は、互いに対向する一対のフランジ１１ａ，１１ｂの間に設けられる補強板部４２を有する。ここで、補強板部４２は鋼板が折り曲げられて加工されたものであり、７枚の板部４２ａが各々所定の角度で蛇腹状に接続された形状に一体的に形成されるとともに、鋼製部材４００の長手方向に延びる。また、補強板部４２は、一対のフランジ１１ａ，１１ｂの各々に対して直交するように接続されている。図７に示すように、一対のフランジ１１ａ，１１ｂのうちの一方のフランジ１１ａと補強板部４２との接続箇所４３は、破線で示すように、蛇腹状に折れ曲がった折線状の細長帯形状をなす。ここで、接続箇所４３の中心線を、フランジ１１ａと補強板部４２との接続線Ａ５とする。接続線Ａ５は、７辺の直線部分を有する折線形状である。そして、板部４２ａの各々の接続線Ａ５の長さをＤ３とすると、接続線Ａ５の長さの合計は７×Ｄ３であり、一対のフランジ１１ａ，１１ｂの長手方向長さＬよりも長い。すなわち、接続線Ａ５の長さの合計は、一対のフランジ１１ａ，１１ｂのうちのどのフランジの長手方向長さよりも長い。 Embodiment 4 FIG.
7 and 8 show the configuration of a steel member 400 according to Embodiment 4 of the present invention.
As shown in FIG. 7, the steel member 400 has a reinforcing plate portion 42 provided between a pair of flanges 11a and 11b facing each other. Here, the reinforcing plate portion 42 is formed by bending a steel plate, and the seven plate portions 42a are integrally formed in a shape connected to each other in a bellows shape at a predetermined angle, and made of steel. The member 400 extends in the longitudinal direction. Further, the reinforcing plate portion 42 is connected so as to be orthogonal to each of the pair of flanges 11a and 11b. As shown in FIG. 7, the connection portion 43 between one flange 11a of the pair of flanges 11a and 11b and the reinforcing plate portion 42 has a folded strip-like elongated band shape bent in a bellows shape as shown by a broken line. Eggplant. Here, let the center line of the connection location 43 be the connection line A5 between the flange 11a and the reinforcing plate portion. The connection line A5 has a polygonal line shape having a straight portion with seven sides. When the length of each connection line A5 of the plate portion 42a is D3, the total length of the connection lines A5 is 7 × D3, which is longer than the longitudinal length L of the pair of flanges 11a and 11b. That is, the total length of the connection line A5 is longer than the longitudinal length of any of the pair of flanges 11a and 11b.

以上より、この実施の形態４に係る鋼製部材４００においても、鋼製部材１００，２００，３００と同様に、フランジ１１ａと補強板部４２との接続線Ａ５の長さは、フランジ１１ａ，１１ｂの長手方向の長さＬよりも長い。従って、一般的なＨ形鋼のウェブと比較して、補強板部４２はフランジ１１ａ，１１ｂをより長い接続線Ａ３を介して支持しており、鋼製部材４００の横座屈が防止される。また、補強板部４２は、ウェブに相当する部材を折り曲げた形状のため、新たにスチフナを設ける必要がなく、鋼製部材４００を製造するコスト及び時間が短縮される。また、補強板部４２は、複数の板部４２ａが蛇腹状に連結された形状であるため、座屈に対してより補強される。 As described above, also in the steel member 400 according to the fourth embodiment, the length of the connection line A5 between the flange 11a and the reinforcing plate portion 42 is the flanges 11a and 11b, similarly to the steel members 100, 200, and 300. Longer than the length L in the longitudinal direction. Therefore, compared with a general H-shaped steel web, the reinforcing plate portion 42 supports the flanges 11a and 11b via the longer connection line A3, and the lateral buckling of the steel member 400 is prevented. Further, since the reinforcing plate portion 42 is formed by bending a member corresponding to a web, it is not necessary to newly provide a stiffener, and the cost and time for manufacturing the steel member 400 are reduced. Further, the reinforcing plate portion 42 has a shape in which a plurality of plate portions 42a are connected in a bellows shape, and thus is further reinforced against buckling.

なお、実施の形態３及び４において、鋼製部材３００，４００の補強板部３２，４２は、一枚の帯形状の鋼板が折り曲げられて加工されたものであるが、これに限定されない。すなわち、鋼製部材３００の補強板部３２は、縦板部３２ａ及び横板部３２ｂに相当する鋼板が、各々溶接によって接続されて形成されてもよい。また、同様に、鋼製部材４００の補強板部４２は、板部４２ａに相当する複数の鋼板が、各々溶接によって接続されて形成されていてもよい。 In the third and fourth embodiments, the reinforcing plate portions 32 and 42 of the steel members 300 and 400 are formed by bending a single strip-shaped steel plate, but are not limited thereto. That is, the reinforcing plate portion 32 of the steel member 300 may be formed by connecting steel plates corresponding to the vertical plate portion 32a and the horizontal plate portion 32b, respectively, by welding. Similarly, the reinforcing plate portion 42 of the steel member 400 may be formed by connecting a plurality of steel plates corresponding to the plate portion 42a by welding.

１１ａ，１１ｂフランジ、１２ａ，１２ｂ，２２，３２，４２補強板部、１００，２００，３００，４００鋼製部材、Ａ１，Ａ２，Ａ３，Ａ４，Ａ５接続線。 11a, 11b Flange, 12a, 12b, 22, 32, 42 Reinforcing plate part, 100, 200, 300, 400 Steel member, A1, A2, A3, A4, A5 connecting wire.

Claims

A pair of flanges facing each other;
And at least one reinforcing plate provided between the pair of flanges,
The sum of the lengths of the connection lines connecting any one of the pair of flanges and the reinforcing plate portion is longer than the length of any one of the pair of flanges in the longitudinal direction. Made parts.

2. The steel member according to claim 1, wherein two reinforcing plate portions extending in the longitudinal direction so as to face each other are provided between the pair of flanges.

The steel member according to claim 1, wherein the connection line has a curved shape.

The steel member according to claim 1, wherein the connection line has a broken line shape having at least two straight portions.