JP2018172875A - Floor structure - Google Patents

Floor structure Download PDF

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JP2018172875A
JP2018172875A JP2017070136A JP2017070136A JP2018172875A JP 2018172875 A JP2018172875 A JP 2018172875A JP 2017070136 A JP2017070136 A JP 2017070136A JP 2017070136 A JP2017070136 A JP 2017070136A JP 2018172875 A JP2018172875 A JP 2018172875A
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upper flange
opening
floor structure
floor slab
shaped steel
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JP7067870B2 (en
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吉田 文久
Fumihisa Yoshida
文久 吉田
拓馬 西
Takuma Nishi
拓馬 西
賢二 古海
Kenji Furuumi
賢二 古海
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Daiwa House Industry Co Ltd
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Daiwa House Industry Co Ltd
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Abstract

PROBLEM TO BE SOLVED: To provide a floor structure which can form a relatively large opening as an opening for releasing a constraint, in a floor structure in which a concrete floor slab is arranged on an upper face of an upper flange of a beam, and which constrains the upper flange by the concrete floor slab.SOLUTION: In a floor structure in which a concrete floor slab 2 is arranged on an upper face of an upper flange 11 of an H-shaped steel beam 1, and which constrains the upper flange 11 by the concrete floor slab 2, in the floor slab 2, an opening 10A having a prescribed width on a material axial direction of the H-shaped steel beam 1 is formed at an edge side of the H-shaped steel beam 1, and in a point in which the opening 10A is formed, an upper flange constraint material 5A for constraining the movement of the upper flange 11 of the H-shaped steel beam 1 is joined to the upper flange 11 without being joined to a lower flange 12 of the H-shaped steel beam 1.SELECTED DRAWING: Figure 1

Description

この発明は、梁の上フランジの上面にコンクリートの床スラブが設けられた床構造に関する。   The present invention relates to a floor structure in which a concrete floor slab is provided on an upper surface of an upper flange of a beam.

特許文献1には、スタッドが設けられたフランジの上部および材軸方向に直交する水平方向の一方側に連続して床スラブが配置される鉄骨梁において、スタッドの周辺における床スラブのコンクリートのコーン状破壊を抑制、またはコーン状破壊が発生しても急激な荷重低下を伴わない構造の鉄骨梁が開示されている。具体的には、両端部が柱に剛接合されるとともに、上フランジの上部に材軸方向に沿って複数のスタッドが配列して接合され、上フランジの上部および材軸方向に直交する水平方向の一方側に連続して床スラブが配置された鉄骨梁において、床スラブのコンクリートと定着する補強部材が、上フランジに接合されている。   Patent Document 1 discloses a concrete beam of a floor slab around a stud in a steel beam in which a floor slab is continuously arranged on an upper portion of a flange provided with a stud and on one side in a horizontal direction perpendicular to the material axis direction. A steel beam having a structure that does not cause a sudden load drop even when cone-like fracture occurs or a cone-like fracture occurs is disclosed. Specifically, both ends are rigidly joined to the column, and a plurality of studs are arranged and joined to the upper part of the upper flange along the material axis direction, and the horizontal direction perpendicular to the upper part of the upper flange and the material axis direction In the steel beam in which the floor slab is continuously arranged on one side of the steel plate, the reinforcing member fixed to the concrete of the floor slab is joined to the upper flange.

特開2016−23440号公報Japanese Unexamined Patent Publication No. 2016-23440

ところで、上記従来の床構造では、上記コンクリートの床スラブが上記上フランジを拘束するので、上記梁に対する横補剛材を不要にすることができる。一方、このように、上記床スラブで上記上フランジを拘束するため、この拘束を解くことになる配管用等の開口として大きな開口は極力形成しないようにしていた。   By the way, in the said conventional floor structure, since the said concrete floor slab restrains the said upper flange, the side stiffener with respect to the said beam can be made unnecessary. On the other hand, since the upper flange is restrained by the floor slab in this way, a large opening is not formed as much as possible as an opening for piping or the like that will release this restriction.

この発明は、上記の事情に鑑み、梁の上フランジの上面にコンクリートの床スラブが設けられており、このコンクリートの床スラブで上記上フランジを拘束する床構造において、上記拘束を解くことになる開口として比較的大きな開口を形成することができる床構造を提供することを目的とする。   In view of the above circumstances, in the floor structure in which a concrete floor slab is provided on the upper surface of the upper flange of the beam and the upper flange is restrained by the concrete floor slab, the restriction is released. An object of the present invention is to provide a floor structure capable of forming a relatively large opening as the opening.

この発明の床構造は、上記の課題を解決するために、梁の上フランジの上面にコンクリートの床スラブが設けられており、このコンクリートの床スラブで上記上フランジを拘束する床構造であって、上記床スラブには上記梁の材軸方向上に幅を有する開口が形成されるとともに、当該開口が形成された箇所には上記梁の上記上フランジの移動を拘束する上フランジ拘束材が上記梁の下フランジには接合されずに上記上フランジに接合されていることを特徴とする。   In order to solve the above problems, the floor structure of the present invention is a floor structure in which a concrete floor slab is provided on the upper surface of the upper flange of the beam, and the upper flange is restrained by the concrete floor slab. The floor slab is formed with an opening having a width in the direction of the material axis of the beam, and an upper flange restraining material for restraining the movement of the upper flange of the beam is formed at the position where the opening is formed. It is characterized by being joined to the upper flange without being joined to the lower flange of the beam.

上記の構成であれば、梁の上フランジの上面にコンクリートの床スラブが設けられており、このコンクリートの床スラブで上記上フランジを拘束する床構造において、上記開口の形成で無くされる上記床スラブに代わって上記梁の上記上フランジの移動を拘束する上フランジ拘束材を備えるので、上記拘束を解くことになる開口として比較的大きな開口を形成することができる。また、上フランジ拘束材は下フランジには接合されず、当該上フランジ拘束材の上記梁に接合される部位の材料を節約できるので低コスト化も図れる。   In the above structure, a concrete floor slab is provided on the upper surface of the upper flange of the beam, and the floor slab is eliminated by the formation of the opening in the floor structure in which the upper flange is restrained by the concrete floor slab. Since the upper flange restraining material that restrains the movement of the upper flange of the beam is provided instead, a relatively large opening can be formed as an opening that releases the restraint. In addition, the upper flange restraining material is not joined to the lower flange, and the material of the portion of the upper flange restraining material joined to the beam can be saved, so that the cost can be reduced.

上記上フランジ拘束材は上記上フランジに溶接固定されてもよい。   The upper flange restraining material may be fixed to the upper flange by welding.

上記上フランジ拘束材は上記上フランジに溶接固定された接続板に締結部材によって固定されてもよい。   The upper flange restraining material may be fixed by a fastening member to a connection plate fixed to the upper flange by welding.

上記上フランジ拘束材は上記上フランジとウェブに溶接固定されたシャープレートに締結部材によって固定されてもよい。   The upper flange restraining material may be fixed by a fastening member to a shear plate fixed to the upper flange and the web by welding.

上記上フランジ拘束材は、上記開口の縁に沿って設けられていてもよい。これによれば、開口を有効に利用できるとともに、開口縁の欠け等の防止も図りやすくなる。   The upper flange restraining material may be provided along an edge of the opening. According to this, the opening can be used effectively, and it is easy to prevent the opening edge from being chipped.

上記上フランジ拘束材は、上記梁の材軸方向に直交して設けられ、一端側が上記梁の上フランジに接合され、他端側が上記梁から離間して配置されている他の梁に接合されていてもよい。   The upper flange restraining material is provided orthogonal to the beam axial direction of the beam, one end side is joined to the upper flange of the beam, and the other end side is joined to another beam arranged away from the beam. It may be.

或いは、上記上フランジ拘束材は、交差配置された2本の梁に斜めに架け渡されて設けられていてもよい。   Alternatively, the upper flange restraining material may be provided so as to be bridged obliquely between two crossed beams.

上記上フランジ拘束材の耐力が数1で示される条件を備えてもよい。
The proof stress R P t of the upper flange constraining material may be provided with a condition expressed by Equation 1.

本発明であれば、梁の上フランジの上面にコンクリートの床スラブが設けられており、このコンクリートの床スラブで上記上フランジを拘束する床構造において、上記開口の形成で無くされる上記床スラブに代わって上記梁の上記上フランジの移動を拘束する上フランジ拘束材を備えるので、上記拘束を解くことになる開口として比較的大きな開口を形成することができるという効果を奏する。   According to the present invention, a concrete floor slab is provided on the upper surface of the upper flange of the beam. In the floor structure in which the upper flange is restrained by the concrete floor slab, the floor slab that is eliminated by the formation of the opening is provided. Instead, since the upper flange restraining material for restraining the movement of the upper flange of the beam is provided, there is an effect that a relatively large opening can be formed as an opening for releasing the restraint.

本発明の実施形態にかかる開口がH形鋼梁の縁に沿って形成される床構造を示した図であって、同図(A)は概略の平面図であり、同図(B)は概略の断面図である。It is the figure which showed the floor structure in which the opening concerning embodiment of this invention is formed along the edge of an H-shaped steel beam, Comprising: The figure (A) is a schematic top view, The figure (B) is the figure. It is a schematic sectional drawing. 本発明の他の実施形態の床構造を示す概略の断面図である。It is a schematic sectional drawing which shows the floor structure of other embodiment of this invention. 本発明の他の実施形態の床構造を示す概略の断面図である。It is a schematic sectional drawing which shows the floor structure of other embodiment of this invention. 本発明の他の実施形態の床構造を示す概略の断面図である。It is a schematic sectional drawing which shows the floor structure of other embodiment of this invention. 開口に作用する曲げモーメントの分布を示すとともに、H形鋼梁の縁側で床スラブに開口を形成する場合の上記H形鋼梁の材軸方向の開口幅を、補剛部を設ける場合の横座屈区間と考えることを示す説明図である。The distribution of the bending moment acting on the opening, and the opening width in the axial direction of the H-shaped steel beam when the opening is formed in the floor slab on the edge side of the H-shaped steel beam. It is explanatory drawing which shows thinking as a bending section.

以下、この発明の実施形態を添付図面に基づいて説明する。この実施形態の建物の床構造は、図1(A)および図1(B)に示すように、柱3に接続された大梁となるH形鋼梁1の上フランジ11の上面にコンクリートの床スラブ2が設けられており、このコンクリートの床スラブ2で上記上フランジ11を拘束して上記H形鋼梁1に対する横補剛を不要にする床構造である。例えば、上記上フランジ11の上面には、スタッド4が固定されている。   Embodiments of the present invention will be described below with reference to the accompanying drawings. As shown in FIGS. 1 (A) and 1 (B), the floor structure of the building of this embodiment is a concrete floor on the upper surface of the upper flange 11 of the H-shaped steel beam 1 which is a large beam connected to the column 3. A slab 2 is provided, and the upper flange 11 is constrained by the concrete floor slab 2 to eliminate the need for lateral stiffening of the H-shaped steel beam 1. For example, the stud 4 is fixed to the upper surface of the upper flange 11.

そして、上記床スラブ2には上記H形鋼梁1の材軸方向上の幅がlbである開口10Aが上記H形鋼梁1の縁側に形成されている。この開口10Aは方形状を有しており、上記材軸方向に直交する2本の互いに平行な辺および上記材軸方向に平行な辺を有している。   In the floor slab 2, an opening 10 </ b> A having a width lb in the material axis direction of the H-shaped steel beam 1 is formed on the edge side of the H-shaped steel beam 1. The opening 10 </ b> A has a square shape, and has two parallel sides perpendicular to the material axis direction and sides parallel to the material axis direction.

上記開口10Aが形成される箇所では、上記床スラブ2による上記上フランジ11の拘束が解かれる。上記開口10Aは、上記床スラブ2の作製時に形成することもあり、上記床スラブ2の作製後に形成することもある。   At the location where the opening 10A is formed, the upper flange 11 is unconstrained by the floor slab 2. The opening 10A may be formed when the floor slab 2 is manufactured, or may be formed after the floor slab 2 is manufactured.

上記開口10Aが形成された箇所には、上記H形鋼梁1の上フランジ11の移動を拘束するべく、2本の上フランジ拘束材5Aが、上記開口10Aの互いに平行な上記2本の辺に沿って設けられる。上記上フランジ拘束材5Aは、上記H形鋼梁1の下フランジ12には接合されずに上記上フランジ11に接合される。また、上記開口10Aにおける上記H形鋼梁1の材軸方向に平行な上記辺に沿って配置された連結部材6によって、上記2本の上フランジ拘束材5Aが互いに連結されている。   At the place where the opening 10A is formed, the two upper flange restraining members 5A are arranged in parallel to the two sides of the opening 10A so as to restrain the movement of the upper flange 11 of the H-shaped steel beam 1. It is provided along. The upper flange restraining material 5A is joined to the upper flange 11 without being joined to the lower flange 12 of the H-shaped steel beam 1. Further, the two upper flange restraining members 5A are connected to each other by the connecting member 6 arranged along the side parallel to the material axis direction of the H-shaped steel beam 1 in the opening 10A.

また、図1(B)に示した例では、上記上フランジ拘束材5Aの本体部51は、溝形鋼や山形鋼等からなる。また、上フランジ拘束材5Aを上記H形鋼梁1に接合する部位には、主面が上記H形鋼梁1の材軸方向に直交するシャープレート52が設けられている。このシャープレート52の基端部は、例えば、上記上フランジ11の下面(下面には限らない)とウェブ13に溶接固定されている。そして、上記本体部51は、締結部材であるボルト・ナット53によって上記シャープレート52に固定されている。図示はしていないが、上記上フランジ拘束材5Aの反対側の端部も上記シャープレート52などを用いて上記H形鋼梁1と平行に配置される他の大梁或いは小梁に接合されている。   In the example shown in FIG. 1 (B), the main body 51 of the upper flange restraining material 5A is made of channel steel, angle steel, or the like. Further, a shear plate 52 whose main surface is orthogonal to the material axis direction of the H-shaped steel beam 1 is provided at a portion where the upper flange restraining material 5A is joined to the H-shaped steel beam 1. For example, the base end portion of the shear plate 52 is fixed to the lower surface (not limited to the lower surface) of the upper flange 11 and the web 13 by welding. The main body 51 is fixed to the shear plate 52 by bolts and nuts 53 that are fastening members. Although not shown, the opposite end of the upper flange restraining member 5A is also joined to another large beam or small beam arranged in parallel with the H-shaped steel beam 1 using the shear plate 52 or the like. Yes.

上記の構成であれば、H形鋼梁1の上フランジ11の上面にコンクリートの床スラブ2が設けられており、このコンクリートの床スラブ2で上記上フランジ11を拘束する床構造において、上記開口10Aの形成で無くされる上記床スラブ2に代わって上記H形鋼梁1の上記上フランジ11の移動を拘束する上フランジ拘束材5Aを備えるので、上記拘束を解くことになる開口10Aとして比較的大きな開口を形成することができる。また、上フランジ拘束材5Aが上記H形鋼梁1の下フランジ12には接合されないので、当該上フランジ拘束材5Aを上記H形鋼梁1に接合する部位の材料を節約して低コスト化も図れる。また、上記上フランジ拘束材5Aが上記開口10Aの縁(辺)に沿って設けられていると、この開口10Aを有効に利用できるとともに、開口縁の欠け等の防止も図りやすくなる。   In the above structure, the floor slab 2 made of concrete is provided on the upper surface of the upper flange 11 of the H-shaped steel beam 1. In the floor structure in which the upper flange 11 is restrained by the floor slab 2 of concrete, the opening In place of the floor slab 2 that is not formed by the formation of 10A, the upper flange restraining material 5A that restrains the movement of the upper flange 11 of the H-shaped steel beam 1 is provided. Large openings can be formed. Further, since the upper flange restraining material 5A is not joined to the lower flange 12 of the H-shaped steel beam 1, the material of the portion where the upper flange restraining material 5A is joined to the H-shaped steel beam 1 can be saved and the cost can be reduced. Can also be planned. Further, when the upper flange restraining material 5A is provided along the edge (side) of the opening 10A, the opening 10A can be used effectively and the opening edge can be easily prevented from being chipped.

次に、他の実施形態について説明していく。図2に示す床構造例では、上記上フランジ拘束材5Aの本体部51は例えば棒状部材(鉄筋等)から成る。そして、この本体部51は、溶接部54によって上記上フランジ11の下面に固定されている。固定箇所は下面に限らず、上フランジ11の上面或いは縁面としてもよい。   Next, other embodiments will be described. In the floor structure example shown in FIG. 2, the main body 51 of the upper flange restraining material 5 </ b> A is made of, for example, a rod-shaped member (rebar etc.). The main body 51 is fixed to the lower surface of the upper flange 11 by a weld 54. The fixing location is not limited to the lower surface, and may be the upper surface or the edge surface of the upper flange 11.

また、図3に示す床構造例では、上記上フランジ拘束材5Aの本体部51は例えば板状部材から成る。また、上記H形鋼梁1の上記上フランジ11の下面には、接合板55が溶接部56によって固定されている。固定箇所は下面に限らず、上フランジ11の上面或いは縁面としてもよい。そして、上記本体部51は、上記接合板55に締結部材であるボルト・ナット57によって固定されている。   In the floor structure example shown in FIG. 3, the main body 51 of the upper flange restraining material 5A is made of, for example, a plate-like member. A joining plate 55 is fixed to the lower surface of the upper flange 11 of the H-shaped steel beam 1 by a welded portion 56. The fixing location is not limited to the lower surface, and may be the upper surface or the edge surface of the upper flange 11. The main body 51 is fixed to the joining plate 55 with bolts and nuts 57 as fastening members.

また、図4に示す床構造例では、柱3を挟んで交差配置された2本のH形鋼梁1,1に渡って例えば直角二等辺三角形状に開口10Bが形成されている。そして、上記柱3側を頂角として底辺に相当する縁部に、上フランジ拘束材5Bを設けている。すなわち、上記上フランジ拘束材5Bは、柱3を挟んで交差配置された2本のH形鋼梁1,1に斜めに架け渡されている。上記上フランジ拘束材5Bと上記H形鋼梁1,1との接合には上述したシャープレート52等を用いることができる。この場合、上記シャープレート52はH形鋼梁1の材軸方向に対して所定角度(例えば、45度)傾いて存在することになる。   Further, in the floor structure example shown in FIG. 4, the opening 10 </ b> B is formed in, for example, a right-angled isosceles triangle shape over the two H-shaped steel beams 1 and 1 that are arranged to intersect each other with the pillar 3 interposed therebetween. And the upper flange restraint material 5B is provided in the edge part equivalent to a base with the said pillar 3 side as an apex angle. That is, the upper flange restraining material 5B is bridged obliquely between the two H-shaped steel beams 1 and 1 that are arranged so as to cross each other with the column 3 interposed therebetween. The above-described shear plate 52 or the like can be used for joining the upper flange restraining material 5B and the H-shaped steel beams 1, 1. In this case, the shear plate 52 is inclined with respect to the material axis direction of the H-shaped steel beam 1 by a predetermined angle (for example, 45 degrees).

図4の構造において、上記開口10Bにおける上記H形鋼梁1の材軸方向上の幅lbについては、上記開口10BのH形鋼梁1に沿う垂直投影長さとすることができる。   In the structure of FIG. 4, the width lb in the material axis direction of the H-shaped steel beam 1 in the opening 10B can be a vertical projection length along the H-shaped steel beam 1 of the opening 10B.

これらの床構造においては、上フランジ拘束材5A、5Bの耐力が数1で示される条件を備えるのが望ましい。この条件は、補剛材の必要補剛力についての規定に沿うものである。また、数1の角度θは、図1(A)に示した方形状の開口10Aであれば、90度となり、図4に示した直角二等辺三角形状の開口10Bであれば、45度となる。安全率βは、例えば、3.0とすることができる。
In these floor structures, it is desirable that the proof stress R P t of the upper flange restraint members 5A and 5B is provided with the condition expressed by the equation ( 1). This condition is in accordance with the rules for the required stiffening force of the stiffener. In addition, the angle θ in Equation 1 is 90 degrees for the rectangular opening 10A shown in FIG. 1A, and 45 degrees for the right isosceles triangular opening 10B shown in FIG. Become. The safety factor β can be set to 3.0, for example.

なお、上フランジ拘束材5A、5Bを設けない場合においては、1つの開口における開口幅lbを区間とする横座屈細長比λは、数2で示される式を満足するものとする。
In the case where the upper flange restraining members 5A and 5B are not provided, the lateral buckling slenderness ratio o λ b with the opening width lb in one opening as a section shall satisfy the expression shown in Equation 2.

ここで、床スラブ2の有効幅の内側に開口を設ける場合において、開口幅内では床スラブ2による上フランジ11の移動拘束が無いものと考え、この領域で部分的な横座屈による早期の耐力低下や開口周囲の床スラブ2の損傷を防止するために、上記開口の上限を規定することができる。上記開口を無補剛区間とした場合の弾性座屈解析等により、上フランジ11の圧縮降伏が上フランジ11の弾性横座屈よりも先行する条件について、H形鋼梁1の材軸方向の複数の開口幅lbの合計に制限を設けることができる。そして、各箇所の開口幅lbを横座屈区間とするH形鋼梁1の弾性横座屈モーメント(数3の式参照)を、日本建築学会「鋼構造限界状態設計指針・同解説」に従って算定する。 Here, in the case where an opening is provided inside the effective width of the floor slab 2, it is considered that there is no movement restriction of the upper flange 11 by the floor slab 2 within the opening width, and an early strength due to partial lateral buckling in this region. In order to prevent a drop and damage to the floor slab 2 around the opening, the upper limit of the opening can be defined. By the elastic buckling analysis or the like in the case where the opening is a non-stiffening section, a plurality of conditions in the material axis direction of the H-shaped steel beam 1 with respect to the condition that the compression yielding of the upper flange 11 precedes the elastic lateral buckling of the upper flange 11 are described. A restriction can be placed on the total opening width lb. And, the elastic lateral buckling moment o M e (refer to the formula 3) of the H-shaped steel beam 1 with the opening width lb of each part as the lateral buckling section is referred to as “Design guideline for steel structure limit state / same explanation” by the Architectural Institute of Japan. Calculate according to

ここで、床スラブ2による上フランジ11の横移動拘束のないH形鋼梁1の塑性限界細長比λは、数4の式で表される。なお、この数4の式では、図5に示すように、H形鋼梁1の端部側(M、M)の曲げモーメント分布は台形状になるが、安全側の式となるように、M/M=−1の一様の分布として算出している。ここで、両端の曲げモーメントは複曲率曲げのときを正としており、一様曲げモーメント分布の場合は負となる。 Here, the plastic limit slenderness ratio p λ b of the H-shaped steel beam 1 in which the upper flange 11 is not restrained from lateral movement by the floor slab 2 is expressed by the following equation (4). In the equation ( 4 ), the bending moment distribution on the end side (M 1 , M 2 ) of the H-shaped steel beam 1 is trapezoidal as shown in FIG. In addition, it is calculated as a uniform distribution of M 2 / M 1 = −1. Here, the bending moments at both ends are positive when bicurvature bending, and are negative in the case of uniform bending moment distribution.

H形鋼梁1の塑性変形倍率が2以上となる条件を塑性限界細長比λ以下と考えれば、開口幅lbを横座屈区間とするH形鋼梁1の横座屈細長比λは、数5で示される式を満足する必要がある。 If the condition that the plastic deformation magnification of the H-shaped steel beam 1 is 2 or more is considered to be the plastic limit slenderness ratio p λ b or less, the lateral buckling slenderness ratio o λ b of the H-shaped steel beam 1 having the opening width lb as the lateral buckling section. Needs to satisfy the equation shown in Equation 5.

以上、図面を参照してこの発明の実施形態を説明したが、この発明は、図示した実施形態のものに限定されない。図示した実施形態に対して、この発明と同一の範囲内において、あるいは均等の範囲内において、種々の修正や変形を加えることが可能である。   As mentioned above, although embodiment of this invention was described with reference to drawings, this invention is not limited to the thing of embodiment shown in figure. Various modifications and variations can be made to the illustrated embodiment within the same range or equivalent range as the present invention.

1 :H形鋼梁
2 :床スラブ
3 :柱
4 :スタッド
5A :上フランジ拘束材
5B :上フランジ拘束材
6 :連結部材
10A :開口
10B :開口
11 :上フランジ
12 :下フランジ
13 :ウェブ
51 :本体部
52 :シャープレート
53 :ナット
54 :溶接部
55 :接合板
56 :溶接部
57 :ナット
1: H-shaped steel beam 2: Floor slab 3: Column 4: Stud 5A: Upper flange restraint material 5B: Upper flange restraint material 6: Connecting member 10A: Opening 10B: Opening 11: Upper flange 12: Lower flange 13: Web 51 : Main body 52: Shear plate 53: Nut 54: Welded portion 55: Joining plate 56: Welded portion 57: Nut

Claims (8)

梁の上フランジの上面にコンクリートの床スラブが設けられており、このコンクリートの床スラブで上記上フランジを拘束する床構造であって、上記床スラブには上記梁の材軸方向上に幅を有する開口が形成されるとともに、当該開口が形成された箇所には上記梁の上記上フランジの移動を拘束する上フランジ拘束材が上記梁の下フランジには接合されずに上記上フランジに接合されていることを特徴とする床構造。   A concrete floor slab is provided on the upper surface of the upper flange of the beam, and the upper flange is restrained by the concrete floor slab, and the floor slab has a width in the direction of the material axis of the beam. The upper flange restraining material that restrains the movement of the upper flange of the beam is joined to the upper flange without being joined to the lower flange of the beam. Floor structure characterized by 請求項1に記載の床構造において、上記上フランジ拘束材は上記上フランジに溶接固定されることを特徴とする床構造。   The floor structure according to claim 1, wherein the upper flange restraining material is fixed to the upper flange by welding. 請求項1に記載の床構造において、上記上フランジ拘束材は上記上フランジに溶接固定された接続板に締結部材によって固定されることを特徴とする床構造。   2. The floor structure according to claim 1, wherein the upper flange restraining material is fixed to a connection plate welded to the upper flange by a fastening member. 請求項1に記載の床構造において、上記上フランジ拘束材は上記上フランジとウェブに溶接固定されたシャープレートに締結部材によって固定されることを特徴とする床構造。   The floor structure according to claim 1, wherein the upper flange restraining member is fixed to a shear plate welded and fixed to the upper flange and a web by a fastening member. 請求項1〜請求項4のいずれか1項に記載の床構造において、上記上フランジ拘束材は、上記開口の縁に沿って設けられていることを特徴とする床構造。   The floor structure according to any one of claims 1 to 4, wherein the upper flange restraining material is provided along an edge of the opening. 請求項1〜請求項5のいずれか1項に記載の床構造において、上記上フランジ拘束材は、上記梁の材軸方向に直交して設けられ、一端側が上記梁の上フランジに接合され、他端側が上記梁から離間して配置されている他の梁に接合されていることを特徴とする床構造。   The floor structure according to any one of claims 1 to 5, wherein the upper flange restraining material is provided orthogonal to the material axis direction of the beam, and one end side is joined to the upper flange of the beam, A floor structure characterized in that the other end side is joined to another beam arranged apart from the beam. 請求項1〜請求項5のいずれか1項に記載の床構造において、上記上フランジ拘束材は、交差配置された2本の梁に斜めに架け渡されて設けられていることを特徴とする床構造。   The floor structure according to any one of claims 1 to 5, wherein the upper flange restraining material is provided so as to be obliquely bridged between two cross-arranged beams. Floor structure. 請求項1〜請求項7のいずれか1項に記載の床構造において、上記上フランジ拘束材の耐力が数1で示される条件を備えることを特徴とする床構造。
The floor structure according to any one of claims 1 to 7, wherein the proof stress R P t of the upper flange restraining material is provided with a condition represented by Formula 1.
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JP2001254469A (en) * 2000-03-14 2001-09-21 Okumura Corp Skeleton formed of altered floor slab
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JPH01290854A (en) * 1988-05-16 1989-11-22 Shimizu Corp Method for reinforcing in-plane shear of floor board
JPH0649616U (en) * 1992-12-14 1994-07-08 ナショナル住宅産業株式会社 Deck plate support structure
JP2001254469A (en) * 2000-03-14 2001-09-21 Okumura Corp Skeleton formed of altered floor slab
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Publication number Priority date Publication date Assignee Title
JP2021085167A (en) * 2019-11-26 2021-06-03 Jfeスチール株式会社 Steel beam having floor slab with opening and reinforcement method thereof
JP7314030B2 (en) 2019-11-26 2023-07-25 Jfeスチール株式会社 Steel frame beam with floor slab having opening and its reinforcement method

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