JP2010229660A - Steel pipe column of non-diaphragm type - Google Patents

Steel pipe column of non-diaphragm type Download PDF

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JP2010229660A
JP2010229660A JP2009076454A JP2009076454A JP2010229660A JP 2010229660 A JP2010229660 A JP 2010229660A JP 2009076454 A JP2009076454 A JP 2009076454A JP 2009076454 A JP2009076454 A JP 2009076454A JP 2010229660 A JP2010229660 A JP 2010229660A
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column
steel pipe
joint
thickness
pipe column
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Toyoaki Shiaku
豊明 塩飽
Takeyuki Takada
武之 高田
Kazunari Fujiwara
一成 藤原
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Kobe Steel Ltd
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Kobe Steel Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a light-weight and inexpensive steel pipe column ensuring a sufficient strength for safety of a column-beam connection part. <P>SOLUTION: In this steel pipe column 1 of non-diaphragm type, the outside diameter of the column-beam connection part 3 and the outside diameter of a non-column-beam connection part 4 are the same, the wall thickness (t) of the column-beam connection part 3 is 1.2 to-3.0 to when wall the thickness of the non-column-beam connection part 4 is to, and a beam member 2 is directly joined with the column-beam connection part 3. Furthermore, the wall thickness to of the non-column-beam connection part is smaller than the wall thickness to' of the steel pipe column having the column-beam connection part of diaphragm type (to&le;to'). <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

本発明は、鋼構造物などに使用されるノンダイアフラム形式の鋼管柱に関する。   The present invention relates to a non-diaphragm type steel pipe column used for a steel structure or the like.

従来より、ビルや立体駐車場などの鉄骨構造物(鋼構造物)を建造する場合には、鋼管柱(円形鋼管柱や角形鋼管柱)を立てて、この鋼管柱に梁材を取り付ける構造が採用されている。鋼管柱に梁材を接続するにあたっては、その柱梁仕口部の構造としてダイアフラム形式(通しダイアフラム、内ダイアフラム、リングダイアフラム)が採用されることが多い。
一例として、外ダイアフラム形式の柱梁仕口部は、図4に示すように、鋼管柱の外壁面にリングダイアフラムを嵌め込んだ上で鋼管とリングダイアフラムを溶接し、リングダイアフラムにブラケットを溶接した上で、梁材を接続するものとなっている。
Conventionally, when building a steel structure (steel structure) such as a building or multistory parking lot, there is a structure in which a steel pipe column (round steel pipe column or square steel pipe column) is set up and a beam material is attached to this steel pipe column. It has been adopted. In connecting a beam material to a steel pipe column, a diaphragm type (through diaphragm, inner diaphragm, ring diaphragm) is often adopted as the structure of the column beam joint.
As an example, as shown in FIG. 4, the outer diaphragm type column beam joint has a ring diaphragm fitted on the outer wall surface of the steel pipe column, welds the steel pipe and the ring diaphragm, and welds the bracket to the ring diaphragm. Above, the beam material is connected.

一方で、柱梁仕口部として、ダイヤフラム形式を用いないもの(ノンダイアフラム形式)を採用することもある。以下に、ノンダイアフラム形式の柱梁仕口部の構造やこの構造を採用可能な鋼管柱に関する先行技術文献を示す。
特許文献1は、梁と梁を支持する柱とを備えて構成され、柱が管体の内部にコンクリートを充填したコンクリート充填柱であるとともに、梁荷重に基づき柱に作用する軸方向力をコンクリートに伝達する内側突出部を、管体の内面に備えた柱梁接合部の構造であって、軸方向力の作用方向にあって、内側突出部の配設位置よりも下側の管体部位に、標準肉厚の標準管体部に対して管体外径側に増厚された外側厚肉部を備えた柱梁接合部の構造を開示する。
On the other hand, the column beam joint may be a non-diaphragm type that does not use a diaphragm type. The prior art documents relating to the structure of the non-diaphragm column beam joint and the steel pipe columns that can employ this structure are shown below.
Patent Document 1 includes a beam and a column that supports the beam. The column is a concrete-filled column in which concrete is filled in a tubular body, and an axial force acting on the column based on the beam load is applied to the concrete. The inner projecting portion that transmits to the inner surface of the tubular body is a structure of a column beam joint, and is in the direction of the axial force and is located below the position of the inner projecting portion. The structure of the column beam joint part provided with the outer thick part thickened to the pipe outer diameter side with respect to the standard tubular part having the standard thickness is disclosed.

特許文献2は、上下の鋼管柱の間に介装された接合筒体と、鋼管柱の外面と一致された接合筒体の外面と、鋼管柱の内面より内方に位置する接合筒体の内面と、鋼管柱乃至接合筒体に充填されたコンクリートとからなる鋼管コンクリート柱と梁の接続構造を開示する。
特許文献3は、構造体の取付部分に厚肉部を設けてなる円形鋼管柱において、全長に亘って内径が一定で前記厚肉部が外方に膨出して設けられている厚肉部を有する円形鋼管柱を開示する。
Patent Document 2 discloses a bonded cylinder body interposed between upper and lower steel pipe columns, an outer surface of a bonded cylinder body aligned with the outer surface of the steel pipe column, and a bonded cylinder body positioned inward from the inner surface of the steel pipe column. Disclosed is a connection structure between a steel pipe concrete column and a beam composed of an inner surface and a concrete filled in a steel pipe column or a joining cylinder.
Patent Document 3 discloses a circular steel pipe column in which a thick portion is provided in a mounting portion of a structure, and a thick portion in which an inner diameter is constant over the entire length and the thick portion bulges outward is provided. Disclosed is a circular steel pipe column having.

特許文献4は、厚肉継目無鋼管を熱間圧延成形してなる仕口部角鋼管柱と、この仕口部角鋼管柱に取付けた梁とからなることを特徴とする角形鋼管柱の柱梁仕口部を開示する。   Patent Document 4 discloses a square steel pipe column, characterized in that it comprises a jointed square steel pipe column formed by hot rolling a thick-walled seamless steel pipe and a beam attached to the jointed square steel pipe column. Disclose the beam joint.

特開平9−13503号公報JP-A-9-13503 特開平4−106240号公報JP-A-4-106240 特開2005−264535号公報JP 2005-264535 A 特開平8−302899号公報JP-A-8-302899

上述したような鋼管柱や鋼管柱の柱梁仕口部における強度設計は、従来工法であるダイアフラム形式を採用するのであれば、日本建築学会の鋼管構造設計施工指針に基づいて設計を行うことができる。
この設計指針に準拠する場合、ノンダイアフラム形式の柱梁仕口部に関する耐力評価としては、外ダイアフラムのサイズを0として耐力評価式を流用することが行われている。このやり方で、構造上の安全性を確保するようにした場合、耐力アップのために鋼管柱の肉厚を増厚させる必要がある。ところが、前述の設計指針は、増厚させる範囲を明確には規定していないため、現状、安全性を確保すべく鋼管柱全長に亘って肉厚の増厚を実施しているものが多い。かかる増厚は、鋼管柱の重量アップやコストアップにつながる。
The strength design in the steel pipe columns and the beam joints of the steel pipe columns as described above can be designed based on the steel pipe structure design and construction guidelines of the Architectural Institute of Japan if the diaphragm method which is the conventional method is adopted. it can.
When conforming to this design guideline, as a strength evaluation for a non-diaphragm type column beam joint, the size of the outer diaphragm is set to 0 and a strength evaluation formula is used. When structural safety is ensured in this manner, it is necessary to increase the thickness of the steel pipe column in order to increase the strength. However, since the above-mentioned design guidelines do not clearly define the range to increase the thickness, at present, in many cases, the thickness is increased over the entire length of the steel pipe column in order to ensure safety. Such thickening leads to an increase in weight and cost of the steel pipe column.

このような鋼管柱の増厚などに着目して、先行技術文献を考察してみると、特許文献1が開示する柱梁接合部の構造は、その増厚部分のサイズに関し明確に寸法を開示していないため、特許技術文献1に則り鋼管柱を製作しようとしても、安全性を確保しつつ経済的な鋼管柱とすることはできないのが現状である。加えて、増厚部は、外側に突出するものであるため、意匠性等に問題がある。
同様に、特許文献2〜特許文献4に開示された柱梁接合部の構造に関しても、増厚部分のサイズに関し明確に寸法を開示していないため、実際に鋼管柱を製作することが困難である。
When considering the prior art documents, paying attention to such thickening of the steel pipe column, the structure of the column beam joint disclosed in Patent Document 1 clearly discloses the dimensions regarding the size of the thickened portion. Therefore, even if an attempt is made to manufacture a steel pipe column in accordance with Patent Document 1, it is not possible to make an economical steel pipe column while ensuring safety. In addition, since the thickened portion protrudes outward, there is a problem in design and the like.
Similarly, regarding the structure of the beam-column joint disclosed in Patent Documents 2 to 4, it is difficult to actually manufacture a steel pipe column because the dimensions are not disclosed clearly regarding the size of the thickened portion. is there.

そこで、本発明は、上記問題点に鑑み、柱梁仕口部において十分な安全強度を確保しつつ、軽量且つ低コストな鋼管柱を提供することを目的とする。   In view of the above problems, an object of the present invention is to provide a lightweight and low-cost steel pipe column while ensuring sufficient safety strength at the column beam joint.

上述の目的を達成するため、本発明においては以下の技術的手段を講じた。
すなわち、本発明のノンダイアフラム形式の鋼管柱は、柱梁仕口部と非柱梁仕口部との外径寸法が同一であり、非柱梁仕口部の肉厚をtoとした場合に柱梁仕口部の肉厚tが1.2to〜3.0toとされていて、前記柱梁仕口部に梁材が直接接合されることを特徴とする。
好ましくは、前記柱梁仕口部及び非柱梁仕口部が円筒状であるとよい。
さらに好ましくは、前記非柱梁仕口部の肉厚toが、ダイアフラム形式の柱梁仕口部を有する鋼管柱の肉厚to’に比して薄肉(to≦to’)となっているとよい。
In order to achieve the above-described object, the present invention takes the following technical means.
In other words, the non-diaphragm type steel pipe column of the present invention has the same outer diameter dimension between the column beam joint and the non-column beam joint, and the thickness of the non-column beam joint is to. The thickness t of the column beam joint is 1.2 to 3.0 to, and a beam material is directly joined to the column beam joint.
Preferably, the column beam joint and the non-column beam joint are cylindrical.
More preferably, the wall thickness to of the non-column beam joint is thinner (to ≦ to ') than the wall thickness to' of a steel pipe column having a diaphragm column beam joint. Good.

特に、前記柱梁仕口部に1又は複数の断面H形の梁材を接合して柱梁構造を形成するにあっては、式(1)〜式(3)を満たすように柱梁仕口部の長さLが設定されているとよい。
L=h+2Lz (1)
Lz=0.2D〜1.0D (2)
Lz/t≧2 (3)

Lz:柱梁仕口部の上部端〜梁材の上部端の距離
(=柱梁仕口部の下部端〜梁材の下部端の距離)
h:梁材の上下方向厚み(梁せい)
D:鋼管柱の外径
t:柱梁仕口部の肉厚

このような鋼管柱であれば、柱梁仕口部において十分な安全強度を確保できると共に、柱梁仕口部の増厚を鋼管全体に及ばせる必要がなくなり、軽量で且つ低コストな鋼管柱とすることが可能となる。また、本手段による鋼管柱であれば、柱梁仕口部以外の部分(非柱梁仕口部)における板厚を、従来のものより薄くすることが可能であり、軽量鋼管柱を実現できる。さらに、柱梁仕口部の外形が非柱梁仕口部の外形と同一であるため、意匠性と居住性を向上させることが可能となる。
In particular, in forming a column beam structure by joining one or a plurality of H-shaped beam members to the column beam joint, the column beam operation is performed so as to satisfy the equations (1) to (3). It is preferable that the length L of the mouth is set.
L = h + 2Lz (1)
Lz = 0.2D-1.0D (2)
Lz / t ≧ 2 (3)

Lz: Distance between the upper end of the column beam joint and the upper end of the beam
(= Distance between the lower end of the column beam joint and the lower end of the beam)
h: Vertical thickness of the beam (because of the beam)
D: Outer diameter of steel pipe column
t: Thickness of column beam joint

With such a steel pipe column, it is possible to ensure sufficient safety strength at the column beam joint, and it is not necessary to increase the thickness of the column beam joint over the entire steel pipe. It becomes possible. Moreover, if it is a steel pipe column by this means, it is possible to make plate | board thickness in parts (non-column beam joint part) other than a column beam joint part thinner than the conventional thing, and a lightweight steel pipe pillar is realizable. . Furthermore, since the outer shape of the column beam joint is the same as the outer shape of the non-column beam joint, it is possible to improve design and habitability.

本発明によれば、柱梁仕口部において十分な安全強度を確保しつつ、軽量且つ低コストなノンダイアフラム形式の鋼管柱を実現できる。   According to the present invention, it is possible to realize a light and low-cost non-diaphragm steel pipe column while ensuring sufficient safety strength at the column beam joint.

本発明の鋼管柱を用いて構築した柱梁構造を示した図である。It is the figure which showed the column beam structure constructed | assembled using the steel pipe column of this invention. 本発明の鋼管柱の製造方法を示した図である。It is the figure which showed the manufacturing method of the steel pipe pillar of this invention. 本発明の鋼管柱及び柱梁仕口部の耐力を評価するために実施したFEM解析を示しており、(a)は解析モデルを示したもの、(b)は解析結果(変形状態)の一例を示したもの、(c)は解析結果(応力分布状態)の一例を示したものである。The FEM analysis implemented in order to evaluate the proof stress of the steel pipe column and column beam joint part of this invention is shown, (a) showed the analysis model, (b) is an example of an analysis result (deformation state) (C) shows an example of the analysis result (stress distribution state). 従来例であるダイアフラム形式の柱梁仕口部を示した図である。It is the figure which showed the diaphragm type column beam joint part which is a prior art example.

以下、本発明の実施形態を、図を基に説明する。なお、以下の説明では、同一の部品には同一の符号を付してある。それらの名称及び機能も同じである。したがって、それらについての詳細な説明は繰り返さない。
図1を参照して、本発明に係るノンダイアフラム形式の鋼管柱1及びこの鋼管柱1に梁材2が直接接続されてなる柱梁仕口部3の構成について説明する。
本発明の鋼管柱1は、鉄骨構造物などの柱となる鋼管であって断面円筒状である。鋼管柱1は、梁材2が直接溶接される柱梁仕口部3(単に仕口部と呼ぶこともある)と、梁材2が接続されない非柱梁仕口部4(一般柱部と呼ぶことがある)からなる。仕口部3の外径と一般柱部4の外径とは同径Dとされており、仕口部3の肉厚tは一般柱部4の肉厚toより厚いものとなっている。
Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, the same parts are denoted by the same reference numerals. Their names and functions are also the same. Therefore, detailed description thereof will not be repeated.
With reference to FIG. 1, the structure of the non-diaphragm type steel pipe pillar 1 concerning this invention and the column beam joint part 3 by which the beam material 2 is directly connected to this steel pipe pillar 1 is demonstrated.
The steel pipe pillar 1 of the present invention is a steel pipe serving as a pillar of a steel structure or the like and has a cylindrical cross section. The steel pipe column 1 includes a column beam joint 3 (which may be simply referred to as a joint) to which the beam member 2 is directly welded, and a non-column beam joint 4 to which the beam member 2 is not connected (general column portion and May be called). The outer diameter of the joint portion 3 and the outer diameter of the general column portion 4 are the same diameter D, and the thickness t of the joint portion 3 is thicker than the thickness to of the general column portion 4.

詳しくは、仕口部3には、梁材2と略同じ上下高さ(梁せい)を有するブラケット部材5が溶接により直接取り付けられる。取り付けられるブラケット部材5の数、鋼管柱1の周方向位置は、接続される梁材2すなわち作りたい構造物に応じて異なる。図1に示すように、ブラケット部材5には、梁材2が複数のボルトにより接続される。
鋼管柱1の仕口部3の肉厚tは、一般柱部4の肉厚をtoとした場合に、t=1.2to〜3.0toとされいる。また、一般柱部4の肉厚toは、従来から用いられているダイアフラム形式の柱梁仕口部3を有する鋼管柱1の肉厚to’に比して同厚もしくは薄肉(to≦to’)となっている。
Specifically, a bracket member 5 having substantially the same vertical height (because of the beam) as the beam member 2 is directly attached to the joint portion 3 by welding. The number of bracket members 5 to be attached and the circumferential position of the steel pipe column 1 differ depending on the beam 2 to be connected, that is, the structure to be made. As shown in FIG. 1, the beam member 2 is connected to the bracket member 5 by a plurality of bolts.
The thickness t of the joint portion 3 of the steel pipe column 1 is t = 1.2 to 3.0 to, where the thickness of the general column portion 4 is to. Further, the wall thickness to of the general column portion 4 is equal to or less than the wall thickness to ′ of the steel pipe column 1 having the diaphragm-type column beam joint portion 3 used conventionally (to ≦ to ′). ).

また、この仕口部3に1又は複数の断面H形の梁材2を接合して柱梁構造を形成する場合を鑑み、式(1)〜式(3)を満たすように仕口部3の長さLが設定されている。

L=h+2Lz (1)
Lz=0.2D〜1.0D (2)
Lz/t≧2 (3)
Lz:柱梁仕口部3の上部端〜梁材2の上部端の距離
h:梁材2の上下方向厚み(梁せい)
D:鋼管柱1の外径
t:柱梁仕口部3の肉厚

なお、鋼管柱1の仕口部3の長さLは、図1に示す如く、「柱梁仕口部3の上部端〜梁材2の上部端の距離」=「柱梁仕口部3の下部端〜梁材2の下部端の距離」=Lzであること、つまり式(1)を満たすことを前提としている。
In view of the case where one or a plurality of H-shaped beam members 2 are joined to the joint portion 3 to form a column beam structure, the joint portion 3 is satisfied so as to satisfy the expressions (1) to (3). Length L is set.

L = h + 2Lz (1)
Lz = 0.2D-1.0D (2)
Lz / t ≧ 2 (3)
Lz: Distance from the upper end of the column beam joint 3 to the upper end of the beam 2
h: Vertical thickness of beam material 2 (because of beam)
D: Outer diameter of steel pipe column 1
t: Thickness of column beam joint 3

The length L of the joint portion 3 of the steel pipe column 1 is “distance between the upper end of the column beam joint portion 3 and the upper end of the beam member 2” = “column beam joint portion 3 as shown in FIG. It is assumed that the distance between the lower end of the beam and the lower end of the beam member 2 = Lz, that is, the expression (1) is satisfied.

図2に示すように、この鋼管柱1は、圧延工程で圧延された厚板を環状に丸めて製造した鋼管をその長手方向に連ね、溶接することで製造される。
詳しくは、肉厚tで長さL(仕口部長さ)の厚肉鋼管10と、肉厚toで所定長さの薄肉鋼管11とを用意し、厚肉鋼管10の上部端と下部端とにそれぞれ薄肉鋼管11を突き当て、突き当て部を溶接することで製造される。突き当て部の溶接は完全溶け込み溶接とし、薄肉鋼管11の突き当て部には開先を形成すると共に、 薄肉鋼管11の突き当て部の内側(裏側)には当て金部材12を当て、アーク溶接などで溶融接合する。
As shown in FIG. 2, the steel pipe column 1 is manufactured by joining a steel pipe, which is manufactured by rolling a thick plate rolled in a rolling process into an annular shape, in the longitudinal direction and welding.
Specifically, a thick steel pipe 10 having a wall thickness t and a length L (joint length) and a thin steel pipe 11 having a wall thickness to and a predetermined length are prepared, and an upper end and a lower end of the thick steel pipe 10 are provided. Each is manufactured by abutting the thin steel pipe 11 and welding the abutting part. Welding of the abutting portion is complete penetration welding, and a groove is formed in the abutting portion of the thin-walled steel pipe 11, and the abutting member 12 is applied to the inside (back side) of the abutting portion of the thin-walled steel pipe 11, and arc welding is performed. For example, melt bonding.

次に、本発明に係る鋼管柱1の寸法(仕口部3の寸法Lや肉厚t、一般柱部4の肉厚to)の根拠について述べる。
本願発明者らは、FEM解析を行うと共に、様々な実験を重ね鋭意研究を行うことで、寸法関係を明らかとした。特に、仕口部3の長さLに関しては、この長さLを最適化することが重要なポイントであり、長ければ仕口部3の補強強度がアップし安全側となるが、重量面、経済性の面からは適正ではない。
そこで、仕口部3の適正な長さLを調査するため、従来の通しダイアフラム形式と本発明の柱梁仕口部3についてのFEM解析を実施した。図3(a),表1には、本発明の鋼管柱1及び柱梁仕口部3の耐力を評価するために実施したFEM解析のモデルを示す。
Next, the basis of the dimensions of the steel pipe column 1 according to the present invention (the dimension L and the wall thickness t of the joint portion 3 and the wall thickness to of the general column portion 4) will be described.
The inventors of the present application have made dimensional relationships clear by conducting FEM analysis and diligently conducting various experiments. In particular, with regard to the length L of the joint portion 3, it is an important point to optimize the length L. If the length L is long, the reinforcement strength of the joint portion 3 is increased and the safety side is improved. It is not appropriate in terms of economy.
Therefore, in order to investigate the appropriate length L of the joint portion 3, FEM analysis was performed on the conventional through diaphragm type and the column beam joint portion 3 of the present invention. FIG. 3A and Table 1 show models of FEM analysis performed for evaluating the proof stress of the steel pipe column 1 and the column beam joint 3 of the present invention.

Figure 2010229660
Figure 2010229660

FEM解析のモデルは、円形鋼管柱1とH形梁材2を十字に組み合わせた解析モデルであり、鋼管柱1の上下端を固定端とし、右側に連結された梁材2の先端部も固定端としている。その状態で、左側に接続された梁材2の先端部に下向きの力を加え、変形させる状況をシミュレーションし、梁材2の先端部の変形量δを算出した(図3(b)参照)。この変形量δを比較することで、柱梁仕口部3の補強の妥当性を確認することとした。ここで本発明の柱梁仕口部3についてLz=0.5Dとしている。
FEM解析の結果を表2に示す。
The FEM analysis model is an analysis model that combines a circular steel pipe column 1 and an H-shaped beam 2 in a cross shape. The upper and lower ends of the steel tube column 1 are fixed ends, and the tip of the beam 2 connected to the right side is also fixed. At the end. In that state, a downward force is applied to the distal end portion of the beam member 2 connected to the left side to simulate the deformation state, and the deformation amount δ of the distal end portion of the beam member 2 is calculated (see FIG. 3B). . By comparing this deformation amount δ, the validity of reinforcement of the column beam joint 3 was confirmed. Here, Lz = 0.5D is set for the column beam joint 3 of the present invention.
Table 2 shows the results of the FEM analysis.

Figure 2010229660
Figure 2010229660

表2から明らかなように、Lz=0.5Dであれば、本発明の仕口部3の方が、梁材2の先端部での変形量δが小さくなることから、通しダイアフラム形式以上に補強できていることが確認できる。
このようなFEM解析を多数実施した結果、円形鋼管柱1とH形梁材2との溶接接合部から、円形鋼管柱1の中心に向かって45°の範囲において、高い応力が分布することを本願発明者らは確認している(図3(c)参照)。ゆえに、Lz=1.0Dを上限としている。
As is apparent from Table 2, if Lz = 0.5D, the joint portion 3 of the present invention has a smaller deformation amount δ at the tip end portion of the beam member 2, and therefore more than the diaphragm type. It can be confirmed that it is reinforced.
As a result of many such FEM analyses, it is found that high stress is distributed in a range of 45 ° from the welded joint between the circular steel pipe column 1 and the H-shaped beam member 2 toward the center of the circular steel pipe column 1. The inventors of the present application have confirmed (see FIG. 3C). Therefore, Lz = 1.0D is set as the upper limit.

また、Lz=0.2D以下の部分では、仕口部3周辺に引っ張り応力が集中的に存在(図3(c)においてハッチで示した部分、σ≧3.0×105MPa)しているため、Lzの下限値としては0.2D以上とする必要がある。
加えて、仕口部3の肉厚tと仕口部3の長さLzのバランスにおいて、仕口部3の厚みを増大しすぎると鋼管柱1自体が大きく加工硬化し変形能力が低下するため、肉厚の過度な増大は抑える必要がある。よってLzおよび肉厚tは、式(3)を満足するようにする。なお、式(3)の左辺が2より小さい場合は、Lzひいては仕口部3の増厚範囲Lが短いため、接続される梁材2を強固に保持することができないことを本願発明者らは確認している。
Further, in the portion of Lz = 0.2D or less, tensile stress is concentrated around the joint 3 (the portion indicated by hatching in FIG. 3C, σ ≧ 3.0 × 10 5 MPa). Therefore, the lower limit value of Lz needs to be 0.2D or more.
In addition, in the balance between the wall thickness t of the joint portion 3 and the length Lz of the joint portion 3, if the thickness of the joint portion 3 is increased too much, the steel pipe column 1 itself is greatly work-hardened and the deformation capacity is reduced. It is necessary to suppress an excessive increase in wall thickness. Therefore, Lz and the wall thickness t satisfy the expression (3). In addition, when the left side of Formula (3) is smaller than 2, since the thickness increase range L of the joint part 3 is short, the inventors of the present application cannot firmly hold the beam 2 to be connected. Has confirmed.

さらに、仕口部3の肉厚tは、t=1.2to〜3.0toとする。本願発明者らは、前述のようなFEM解析の結果より、仕口部3の肉厚tが一般柱部4の肉厚toの1.2倍よりも小さいと、柱梁仕口部3を十分に補強することが出来ないことを確認している。これは、厚肉鋼管10の肉厚tを薄肉鋼管11の板厚toの2サイズアップとした場合に対応する。
一方で、通常使用される円鋼管の最大板厚は100mm程度であり、この板厚の鋼管と組み合わせ可能な(例えば、溶接で接合可能な)薄肉鋼管の板厚は36mm程度である。このことを鑑みた上で、仕口部3の肉厚tは一般柱部4の肉厚toの3.0倍としている。
Further, the wall thickness t of the joint 3 is t = 1.2 to 3.0 to. From the results of the FEM analysis as described above, the inventors of the present application indicate that when the wall thickness t of the joint portion 3 is smaller than 1.2 times the wall thickness to of the general column portion 4, the column beam joint portion 3 is It has been confirmed that it cannot be reinforced sufficiently. This corresponds to a case where the wall thickness t of the thick steel pipe 10 is increased by 2 times the plate thickness to of the thin steel pipe 11.
On the other hand, the maximum thickness of a circular steel pipe that is normally used is about 100 mm, and the thickness of a thin steel pipe that can be combined with the steel pipe of this thickness (for example, that can be joined by welding) is about 36 mm. In consideration of this, the thickness t of the joint portion 3 is set to 3.0 times the thickness to of the general column portion 4.

なお、3倍よりも大きいと柱梁接合部耐力上は問題ないが、安全率を過剰に見込むこととなり、結果、鋼管柱1全体の重量が大きくなり、製造コストや輸送負荷が大きくなることを知見している。かかる状況のため、仕口部3の肉厚tを一般柱部4の肉厚toの1.2倍〜3.0倍の範囲とする。
加えて、一般柱部4の肉厚toが、ダイアフラム形式の柱梁仕口部3を有する鋼管柱1の肉厚to’に比して薄肉することが可能である。なぜならば、例えば地震時の強度を考えるに、鋼管柱1に発生する曲げモーメントは、柱梁接合部交点で最大となる。本願発明の鋼管柱1では、柱梁接合部交点は厚肉の仕口部3であり、薄肉の一般柱部4は、柱梁接合部交点より離れた部分に位置しているため、作用する曲げモーメントは、従来からの鋼柱管のものに比べて低減されたものとなる。よって、一般柱部4の肉厚toが、従来のダイヤフラム形式のものto'より薄くなる。
If it is larger than 3 times, there is no problem in the bearing strength of the beam-column joint, but the safety factor is expected to be excessive, and as a result, the weight of the steel pipe column 1 as a whole increases, and the manufacturing cost and transportation load increase. I know. For this situation, the wall thickness t of the joint portion 3 is set to a range of 1.2 to 3.0 times the wall thickness to of the general column portion 4.
In addition, the wall thickness to of the general column portion 4 can be made thinner than the wall thickness to ′ of the steel pipe column 1 having the diaphragm-type column beam joint portion 3. This is because, for example, considering the strength at the time of an earthquake, the bending moment generated in the steel pipe column 1 is maximum at the intersection of the column beam joints. In the steel pipe column 1 of the present invention, the intersection of the beam-column joint is the thick-walled joint portion 3, and the thin general column 4 is located at a portion away from the intersection of the beam-column joint, and thus acts. The bending moment is reduced compared to that of a conventional steel column tube. Therefore, the wall thickness to of the general column part 4 is thinner than that of the conventional diaphragm type.

なお、安全側に考え、鋼管柱1の肉厚to’を一般柱部4の肉厚toと同厚にしても何ら問題はない。
以上まとめるならば、鋼管柱1の仕口部3や一般柱部4の各寸法を決定するにあたっては、仕口部3の許容耐力Paを算出し、その値が所定値以内となるようにするとよい。許容耐力Paの算出では、H形梁材2の形状・降伏応力度に応じて、仕口部3の増厚範囲L、肉厚tを加味した式(4)を用いることが好ましい。

Pa=f(D,t,L,σ,Bf,tf,σf) (4)
Pa:仕口部3の許容耐力
D:仕口部3の外径
t:仕口部3の管厚
L:仕口部3の増厚範囲(Lz+梁せい+Lz)
σ:仕口部3の降伏応力
f:H形梁材2のフランジの幅
f:H形梁材2のフランジの板厚
σf:H形梁材2のフランジの降伏応力

以上述べた、本発明にかかる鋼管柱1(円形鋼管柱1)の実施例について、表3を基に述べる。
In view of safety, there is no problem even if the thickness to ′ of the steel pipe column 1 is the same as the thickness to ′ of the general column portion 4.
In summary, in determining the dimensions of the joint portion 3 and the general column portion 4 of the steel pipe column 1, the allowable proof stress Pa of the joint portion 3 is calculated so that the value is within a predetermined value. Good. In calculating the allowable proof stress Pa, it is preferable to use the equation (4) in consideration of the thickness increase range L and the wall thickness t of the joint 3 according to the shape of the H-shaped beam member 2 and the degree of yield stress.

Pa = f (D, t, L, σ, B f , t f , σ f ) (4)
Pa: allowable strength of joint 3
D: Outer diameter of the joint 3
t: Pipe thickness of joint 3
L: Thickening range of the joint 3 (Lz + beams + Lz)
σ: Yield stress of joint 3
B f : Width of flange of H-shaped beam 2
t f : thickness of the flange of the H-shaped beam 2
σ f: yield stress of the H Katachiharizai second flange

Examples of the steel pipe column 1 (circular steel pipe column 1) according to the present invention described above will be described based on Table 3.

実施例1においては、階高4000mmオフィスビルを想定し、柱梁仕口部3を中心に柱長さ2000mm(全長4000mm)、鋼管柱1の外径Dを500mmとしている。接続するH形梁材2は、H600×200×11×17(高さ600mm、幅200mm、垂直部の厚み11mm、フランジの厚み17mm)である。
従来技術は、ダイアフラム形式(厚さ22mmの通しダイアフラム)で梁材2を鋼管柱に連結するものである。構造計算を行った結果、ダイアフラム形式で安全な梁構造とするためには、鋼管柱の肉厚は25mmとする必要があり、その結果、鋼管柱全体の重量は1283kgとなった。
In Example 1, an office building having a floor height of 4000 mm is assumed, the column length is 2000 mm (total length is 4000 mm), and the outer diameter D of the steel pipe column 1 is 500 mm with the column beam joint 3 as the center. The H-shaped beam member 2 to be connected is H600 × 200 × 11 × 17 (height 600 mm, width 200 mm, vertical portion thickness 11 mm, flange thickness 17 mm).
In the prior art, the beam 2 is connected to a steel pipe column in a diaphragm format (through diaphragm having a thickness of 22 mm). As a result of structural calculation, in order to obtain a safe beam structure in the diaphragm form, the thickness of the steel pipe column needs to be 25 mm, and as a result, the weight of the entire steel pipe column is 1283 kg.

一方、本発明にかかる鋼管柱1では、仕口部3の肉厚を従来鋼管柱の厚みの1.28倍である32mmした場合、一般柱部4の肉厚を25mmから22mmへと薄肉化することができる。その結果、鋼管重量を1158kgと従来技術の90%に軽減することができた。なお、Lz/t=9.38であり、2以上となっている。Lz=0.6Dであって、0.2D〜1.0Dの範囲内となっている。   On the other hand, in the steel pipe column 1 according to the present invention, when the thickness of the joint portion 3 is 32 mm, which is 1.28 times the thickness of the conventional steel pipe column, the thickness of the general column portion 4 is reduced from 25 mm to 22 mm. can do. As a result, the weight of the steel pipe could be reduced to 1158 kg, 90% of the prior art. Note that Lz / t = 9.38, which is 2 or more. Lz = 0.6D, which is in the range of 0.2D to 1.0D.

Figure 2010229660
Figure 2010229660

実施例2においては、鋼管柱1の外径Dを1100mmとしている。接続する梁材2は、H1100×400×16×36である。
従来技術はダイアフラム形式(厚さ55mmのリングダイアフラム)で梁材2を鋼管柱に連結するものである。構造計算を行った結果、ダイアフラム形式で安全な梁構造とするためには、鋼管柱の肉厚は40mmとする必要があり、その結果、鋼管柱全体の重量は5190kgとなった。
一方、本発明にかかる鋼管柱1では、仕口部3の肉厚を従来鋼管柱の厚みの1.25倍である50mmした場合、一般柱部4の肉厚を40mmから36mmへと薄肉化することができる。その結果、鋼管重量を4897kgと従来技術の94%に軽減することができた。なお、Lz/t=13.2であり、2以上となっている。Lz=0.6Dであって、0.2D〜1.0Dの範囲内となっている。
In Example 2, the outer diameter D of the steel pipe column 1 is 1100 mm. The beam member 2 to be connected is H1100 × 400 × 16 × 36.
In the prior art, the beam 2 is connected to a steel pipe column in the form of a diaphragm (a ring diaphragm having a thickness of 55 mm). As a result of structural calculation, in order to obtain a safe beam structure in the diaphragm form, the thickness of the steel pipe column needs to be 40 mm, and as a result, the weight of the entire steel pipe column is 5190 kg.
On the other hand, in the steel pipe column 1 according to the present invention, when the thickness of the joint portion 3 is 50 mm which is 1.25 times the thickness of the conventional steel pipe column, the thickness of the general column portion 4 is reduced from 40 mm to 36 mm. can do. As a result, the steel pipe weight was reduced to 4897 kg, 94% of the prior art. Note that Lz / t = 13.2, which is 2 or more. Lz = 0.6D, which is in the range of 0.2D to 1.0D.

実施例3においては、鋼管柱1の外径Dを2200mmとしている。接続する梁材2は、H1100×450×25×45である。
従来技術はダイアフラム形式(厚さ50mmの内ダイアフラム)で梁材2を鋼管柱に連結するものである。構造計算を行った結果、ダイアフラム形式で安全な梁構造とするためには、鋼管柱の肉厚は60mmとする必要があり、その結果、鋼管柱全体の重量は17471kgとなった。
一方、本発明にかかる鋼管柱1では、仕口部3の肉厚を従来鋼管柱の厚みの1.33倍である80mmした場合、一般柱部4の肉厚を60mmのままとすることができる。その結果、鋼管重量を16815kgと従来技術の96%に軽減することができた。なお、Lz/t=5.5であり、2以上となっている。Lz=0.2Dであって、0.2D〜1.0Dの範囲内となっている。
In Example 3, the outer diameter D of the steel pipe column 1 is 2200 mm. The beam member 2 to be connected is H1100 × 450 × 25 × 45.
In the prior art, the beam 2 is connected to a steel pipe column in the form of a diaphragm (inner diaphragm having a thickness of 50 mm). As a result of structural calculation, in order to obtain a safe beam structure in the diaphragm format, the thickness of the steel pipe column needs to be 60 mm, and as a result, the weight of the entire steel pipe column is 17471 kg.
On the other hand, in the steel pipe column 1 according to the present invention, when the thickness of the joint portion 3 is 80 mm, which is 1.33 times the thickness of the conventional steel pipe column, the thickness of the general column portion 4 may remain 60 mm. it can. As a result, the weight of the steel pipe could be reduced to 16815 kg, 96% of the prior art. Note that Lz / t = 5.5, which is 2 or more. Lz = 0.2D, which is in the range of 0.2D to 1.0D.

このように、本発明によれば、ノンダイアフラム形式であっても適正な板厚を採用することで、柱梁仕口部において十分な安全強度を確保できる。特に、従来の鋼管柱の肉厚に比して、柱梁仕口部の板厚を一般柱部よりも厚くし、その長さを適正化することにより、一般部鋼管厚を、従来の公的な設計基準、設計指針等に基づき建築物の重量、風荷重、地震荷重等から決定された鋼管柱の肉厚に比して、薄肉化できる。これにより、合理的且つ経済的に鋼管柱を設計でき、鋼管柱全体の重量の軽減が可能となり、鋼管製造および輸送時の負荷を軽減できるものとなっている。   Thus, according to the present invention, sufficient safety strength can be secured at the column beam joint by adopting an appropriate plate thickness even in the non-diaphragm type. In particular, compared with the thickness of the conventional steel pipe column, the thickness of the column beam joint is made thicker than that of the general column part and the length thereof is optimized, so that the general steel pipe thickness is reduced to the conventional public pipe thickness. The wall thickness can be reduced compared to the wall thickness of the steel pipe column determined from the weight of the building, wind load, seismic load, etc. based on the typical design standards and design guidelines. Thereby, a steel pipe pillar can be designed rationally and economically, the weight of the whole steel pipe pillar can be reduced, and the load at the time of steel pipe manufacture and transportation can be reduced.

なお、今回開示された実施形態はすべての点で例示であって制限的なものではないと考えられるべきである。本発明の範囲は上記した説明ではなくて特許請求の範囲によって示され、特許請求の範囲と均等の意味及び範囲内でのすべての変更が含まれることが意図される。
例えば、本実施形態では、仕口部3にブラケット部材5が溶接により取り付けられ、このブラケット部材5に梁材2がボルト接合されてなる柱梁仕口部を例示して説明を行った。しかしながら、仕口部3に直接、梁材2が溶接接合された柱梁仕口部であっても、本発明の鋼管柱1は略同様の作用効果を奏するものとなっている。
The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.
For example, in the present embodiment, the bracket member 5 is attached to the joint portion 3 by welding, and the column beam joint portion in which the beam member 2 is bolted to the bracket member 5 is described as an example. However, the steel pipe column 1 of the present invention has substantially the same effect even if it is a column beam joint portion in which the beam member 2 is welded and joined directly to the joint portion 3.

1 鋼管柱
2 梁材
3 仕口部(柱梁仕口部)
4 一般柱部(非柱梁仕口部)
5 ブラケット部材
10 厚肉鋼管
11 薄肉鋼管
12 当て金部材
1 Steel pipe column 2 Beam material 3 Joint part (column beam joint part)
4 General column (Non-column beam joint)
5 Bracket member 10 Thick-walled steel pipe 11 Thin-walled steel pipe 12 Batter member

Claims (4)

柱梁仕口部と非柱梁仕口部との外径寸法が同一であり、非柱梁仕口部の肉厚をtoとした場合に柱梁仕口部の肉厚tが1.2to〜3.0toとされていて、前記柱梁仕口部に梁材が直接接合されることを特徴とするノンダイアフラム形式の鋼管柱。   The outer diameter of the column beam joint is the same as that of the non-column beam joint, and the thickness t of the column beam joint is 1.2 to A non-diaphragm type steel pipe column characterized in that a beam material is directly joined to the column beam joint, which is 3.0 to. 前記柱梁仕口部及び非柱梁仕口部が円筒状であることを特徴とする請求項1に記載のノンダイアフラム形式の鋼管柱。   The non-diaphragm steel pipe column according to claim 1, wherein the column beam joint and the non-column beam joint are cylindrical. 前記非柱梁仕口部の肉厚toが、ダイアフラム形式の柱梁仕口部を有する鋼管柱の肉厚to’に比して薄肉(to≦to’)となっていることを特徴とする請求項2に記載のノンダイアフラム形式の鋼管柱。   The wall thickness to of the non-column beam joint is thin (to ≦ to ') compared to the wall thickness to ′ of a steel pipe column having a diaphragm-type column beam joint. The non-diaphragm type steel pipe column according to claim 2. 前記柱梁仕口部に1又は複数の断面H形の梁材を接合して柱梁構造を形成するにあっては、式(1)〜式(3)を満たすように柱梁仕口部の長さLが設定されていることを特徴とする請求項2又は3に記載のノンダイアフラム形式の鋼管柱。

L=h+2Lz (1)
Lz=0.2D〜1.0D (2)
Lz/t≧2 (3)

Lz:柱梁仕口部の上部端〜梁材の上部端の距離
(=柱梁仕口部の下部端〜梁材の下部端の距離)
h:梁材の上下方向厚み(梁せい)
D:鋼管柱の外径
t:柱梁仕口部の肉厚
In forming a column beam structure by joining one or a plurality of H-shaped beam members to the column beam joint portion, the column beam joint portion satisfies Expressions (1) to (3). The non-diaphragm type steel pipe column according to claim 2, wherein a length L is set.

L = h + 2Lz (1)
Lz = 0.2D-1.0D (2)
Lz / t ≧ 2 (3)

Lz: Distance between the upper end of the column beam joint and the upper end of the beam
(= Distance between the lower end of the column beam joint and the lower end of the beam)
h: Vertical thickness of the beam (because of the beam)
D: Outer diameter of steel pipe column
t: Thickness of column beam joint
JP2009076454A 2009-03-26 2009-03-26 Steel pipe column of non-diaphragm type Pending JP2010229660A (en)

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Cited By (8)

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JP2015145589A (en) * 2014-02-04 2015-08-13 ナカジマ鋼管株式会社 Junction structure of steel-pipe column and beam
JP2018059384A (en) * 2016-10-03 2018-04-12 マイテック・ホールディングズ・インコーポレイテッドMiTek Holdings, Inc. Forming column assemblies for moment-resisting biaxial beam-to-column joint connections
JP2018059385A (en) * 2016-10-03 2018-04-12 マイテック・ホールディングズ・インコーポレイテッドMiTek Holdings, Inc. Gusset plate and column assembly for moment-resisting biaxial beam-to-column joint connections
JP2018184742A (en) * 2017-04-25 2018-11-22 Jfeスチール株式会社 Non-diaphragm type column beam joint structure
CN109629687A (en) * 2019-01-25 2019-04-16 北京工业大学 A kind of anti-buckling double flute beam-column nodal connection device of the assembled of recoverable function
CN109853733A (en) * 2019-01-25 2019-06-07 北京工业大学 A kind of assembled self reset curvature-prevention inverted L shape web cutting member frame system of recoverable function
CN109853734A (en) * 2019-01-25 2019-06-07 北京工业大学 A kind of assembled Self-resetting frame system of recoverable function
US11332920B2 (en) 2016-05-02 2022-05-17 Mitek Holdings, Inc. Moment resisting bi-axial beam-to-column joint connection

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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015145589A (en) * 2014-02-04 2015-08-13 ナカジマ鋼管株式会社 Junction structure of steel-pipe column and beam
US11332920B2 (en) 2016-05-02 2022-05-17 Mitek Holdings, Inc. Moment resisting bi-axial beam-to-column joint connection
JP2018059384A (en) * 2016-10-03 2018-04-12 マイテック・ホールディングズ・インコーポレイテッドMiTek Holdings, Inc. Forming column assemblies for moment-resisting biaxial beam-to-column joint connections
JP2018059385A (en) * 2016-10-03 2018-04-12 マイテック・ホールディングズ・インコーポレイテッドMiTek Holdings, Inc. Gusset plate and column assembly for moment-resisting biaxial beam-to-column joint connections
US10179991B2 (en) 2016-10-03 2019-01-15 Mitek Holdings, Inc. Forming column assemblies for moment resisting bi-axial beam-to-column joint connections
US11236502B2 (en) 2016-10-03 2022-02-01 Mitek Holdings, Inc. Gusset plate and column assembly for moment resisting bi-axial beam-to-column joint connections
JP2018184742A (en) * 2017-04-25 2018-11-22 Jfeスチール株式会社 Non-diaphragm type column beam joint structure
CN109629687A (en) * 2019-01-25 2019-04-16 北京工业大学 A kind of anti-buckling double flute beam-column nodal connection device of the assembled of recoverable function
CN109853733A (en) * 2019-01-25 2019-06-07 北京工业大学 A kind of assembled self reset curvature-prevention inverted L shape web cutting member frame system of recoverable function
CN109853734A (en) * 2019-01-25 2019-06-07 北京工业大学 A kind of assembled Self-resetting frame system of recoverable function

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