JPH0472017B2 - - Google Patents
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- Publication number
- JPH0472017B2 JPH0472017B2 JP60282079A JP28207985A JPH0472017B2 JP H0472017 B2 JPH0472017 B2 JP H0472017B2 JP 60282079 A JP60282079 A JP 60282079A JP 28207985 A JP28207985 A JP 28207985A JP H0472017 B2 JPH0472017 B2 JP H0472017B2
- Authority
- JP
- Japan
- Prior art keywords
- steel pipe
- concrete
- fire
- steel
- column
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、建築構造物における柱に関し、さら
に詳しくは、耐火性能と構造強度に優れた鋼管コ
ンクリート柱に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a column in a building structure, and more particularly to a steel pipe concrete column with excellent fire resistance and structural strength.
建築構造用部材としての柱には、純鉄骨系、鉄
筋コンクリート系及び鉄骨鉄筋コンクリート系の
ものなどがある。第５図は純鉄骨系の柱を示す断
面図で、(a)はＨ型鋼１、(b)は鋼管２の周囲に全長
に亘つて、それぞれ耐火時間に応じて必要とされ
る耐火被覆（コンクリート）３を施したものであ
る。
Columns used as building structural members include those made of pure steel, reinforced concrete, and steel reinforced concrete. Figure 5 is a sectional view showing a pure steel column, where (a) shows the H-shaped steel 1, and (b) shows the fire-resistant coating ( Concrete) 3 has been applied.
しかしながら、このような純鉄骨系の柱は、高
価なため、第６図ａに示すように、比較的小型の
Ｈ型鋼１ａの周囲に鉄筋４を配設して耐火被覆３
を施した鉄骨鉄筋コンクリート柱、あるいはｂ図
に示すように、比較的小型の鋼管２ａの内部にコ
ンクリート５を充填した充填型鋼管コンクリート
柱として、コストの低減を図つている。 However, such pure steel columns are expensive, so as shown in FIG.
The cost is reduced by using a steel-framed reinforced concrete column, or a filled-type steel pipe concrete column in which concrete 5 is filled inside a relatively small steel pipe 2a, as shown in Figure b.
さらに、充填型鋼管コンクリート柱において
は、充填したコンクリートを有効に活用するた
め、最近では内面全長に亘つて突起が設けられた
鋼管を使用することが提案されており、このよう
な内面突起付鋼管は、鋼管のコンクリートの力の
伝達能力、コンクリートとの一体性がわきめて高
いとされている。 Furthermore, in order to make effective use of the filled concrete in filled steel pipe concrete columns, it has recently been proposed to use steel pipes with protrusions over the entire length of the inner surface. It is said that steel pipes have an extremely high ability to transmit the force of concrete and are highly integrated with concrete.
上記のような従来の柱は、何れもその外面に耐
火被覆３を施しているが、この耐火被覆３は、
(1) コスト的に大きな比重を占めるのにもかかわ
らず、構造的にはなんら寄与しない。
All of the conventional pillars mentioned above have a fire-resistant coating 3 applied to their outer surfaces, but this fire-resistant coating 3 has the following characteristics: (1) Although it occupies a large amount of cost, it has no structural impact. Does not contribute.
(2) 柱の外径が大きくなる。(2) The outer diameter of the column increases.
(3) 外からの衝突等に対して脆く、角部が欠け落
ち易い。(3) It is brittle against external collisions, and the corners are likely to chip off.
(4) 施工が繁雑である（型枠工事を要する場合も
ある。）
(5) 鉄骨面が露出している場合に比べ、意匠的に
見劣りする。(4) Construction is complicated (formwork work may be required.) (5) The design is inferior to the case where the steel frame surface is exposed.
等の問題があり、できれば耐火被覆３省略したい
が、火災時等における荷重に対する安全性の面か
ら、一般的には法令上許されない。Although it would be desirable to omit the fireproof coating 3 if possible, it is generally not permitted by law from the standpoint of safety against loads in the event of a fire.
また、内面突起付鋼管による充填型鋼管コンク
リート柱を使用した場合も、柱全長に亘つて耐火
被覆を施すのであれば、上記各問題が解決されな
いばかりでなく、さらに、
(6) 充填したコンクリートへの力の伝達能力は充
分あるのもかかわらず、その特性を充分利用で
きず、無駄の多い設計となる。 Furthermore, even when using a filled steel pipe concrete column made of steel pipes with internal protrusions, if fireproof coating is applied over the entire length of the column, not only will the above problems not be solved, but also (6) Although it has sufficient force transmission ability, its characteristics cannot be fully utilized, resulting in a wasteful design.
という問題が生じる。A problem arises.
本発明は、上記のような多くの問題点を解決す
るためになされたもので、
少なくとも仕口部範囲の内面に突起を有し、内
部にコンクリートが充填された鋼管を備え、該鋼
管の外周の前記仕口部に所定の長さを加えた耐火
域に耐火被覆を施してなる鋼管コンクリート柱を
提供するものである。
The present invention has been made to solve many of the problems described above, and includes a steel pipe having a protrusion on the inner surface of at least the area of the joint and filled with concrete. The purpose of the present invention is to provide a steel pipe concrete column in which a fire-resistant coating is applied to a fire-resistant area including a predetermined length of the joint portion.
鋼管コンクリート柱は、火災時等に耐火被覆を
施していなくても、充填されたコンクリートによ
つて、相当の垂直荷重に耐えることが既に知られ
ている。本発明では、さらにこの鋼管コンクリー
ト柱の仕口部に耐火被覆を施したことにより、梁
から力が伝達される部分の鋼管の耐火性が増大
し、鋼管内面の突起と相俟つて、火災時等におい
ても、梁からの力が鋼管を介してコンクリート柱
に確実に伝達され、梁を保持することができる。
It is already known that steel pipe concrete columns can withstand considerable vertical loads in the event of a fire, etc., even without a fireproof coating, due to the concrete filled in them. In the present invention, by applying a fire-resistant coating to the joint part of this steel pipe concrete column, the fire resistance of the steel pipe in the part where force is transmitted from the beam is increased, and together with the protrusions on the inner surface of the steel pipe, this increases the fire resistance in the event of a fire. etc., the force from the beam is reliably transmitted to the concrete column via the steel pipe, and the beam can be held.
第１図は本発明実施例の構成図、第２図はその
要部拡大図である。図において、１０は充填型の
鋼管コンクリート柱で、内面に突起１２を有する
鋼管１１にコンクリート１３を充填したものであ
る。１５は鋼管コンクリート柱１０と直交して固
定された鉄骨梁で、上面にはコンクリートの床ス
ラブ１６が施工され、また下面及び両側面には必
要な厚さｂの耐火被覆１７が施されている。
FIG. 1 is a block diagram of an embodiment of the present invention, and FIG. 2 is an enlarged view of its main parts. In the figure, reference numeral 10 indicates a filled-type steel pipe concrete column, in which a steel pipe 11 having a protrusion 12 on the inner surface is filled with concrete 13. 15 is a steel beam fixed perpendicularly to the steel pipe concrete column 10, a concrete floor slab 16 is constructed on the upper surface, and a fireproof coating 17 with a required thickness b is applied on the lower surface and both sides. .
本発明においては、鋼管１１の断面形状は閉鎖
形であれば、丸形、角形等任意形状でよく、また
内面に設けた突起１２も例えば第４図に示すよう
に各種形状のものを使用することができる。ま
た、突起１２は少なくとも鉄骨梁１５から鋼管コ
ンクリート柱１０への力伝達に必要な長さｈの範
囲に設ければよい。これは、後で述べる耐火被覆
１９が仕口部１８にあれば、耐火被覆１９で覆わ
れた領域の大部分が、火災時でも鋼管の耐熱温度
以下になるため、鉄骨梁１５の力を鋼管を介し
て、充分コンクリート柱１０に伝えることができ
るからである。この長さｈは突起の形状によつて
も異なるが、最低で管径ｄ程度、最高でも２ｄ程
度でよく、ほとんどの場合は仕口部１８の高さＨ
以内に納まる。なお、力学的にみて、柱の全長に
亘つて突起１２を設ければ、より有効なことはい
うまでもない。 In the present invention, the cross-sectional shape of the steel pipe 11 may be any shape, such as round or square, as long as it is closed, and the protrusions 12 provided on the inner surface may have various shapes, for example, as shown in FIG. be able to. Further, the protrusion 12 may be provided at least within a length h necessary for transmitting force from the steel beam 15 to the steel pipe concrete column 10. This is because if the fireproof coating 19, which will be described later, is in the joint part 18, most of the area covered with the fireproof coating 19 will be below the heat-resistant temperature of the steel pipe even in the event of a fire. This is because the information can be sufficiently transmitted to the concrete pillar 10 via the . This length h varies depending on the shape of the protrusion, but it may be about the pipe diameter d at the minimum and about 2d at the maximum, and in most cases the height H of the joint part 18
It will fit within. Note that, from a mechanical point of view, it goes without saying that it is more effective if the projections 12 are provided over the entire length of the column.
上記のような鋼管コンクリート柱１０と鉄骨梁
１５とからなる架溝において、本発明はさらに、
鉄骨梁１５から柱１０へ力を伝達する部分、即ち
高さｈの上下に、火災時における鋼管１１と充填
したコンクリート１３の性質とから定まる所定の
長さ（既往の研究から150mm程度あれば充分で
ある）をそれぞれ加えた長さｈ＋２の範囲（以
下耐火域という）の外周部のみに耐火被覆１９を
施したものである。一般に仕口部１８では、鉄骨
梁１５の耐火被覆工事があるので、柱１０につい
てもその施工を仕口部１８で一緒に行なえば、梁
せい、梁の被覆厚さ及び床スラブ厚さを加えた部
分で、鋼管コンクリート柱１０に必要な耐火域
（通常700mm前後）の工事をカバーできることが多
い。したがつて、この梁せい、梁の被覆厚さ及び
床スラブ厚さを加えた部分が、耐火域（ｈ＋２
）より小さい場合のみ、その差に相当する部分
について、別に被覆工事を行えばよいので、作業
の手間もわずかで済む。 In the bridge made of the steel pipe concrete column 10 and the steel beam 15 as described above, the present invention further includes:
The part that transmits force from the steel beam 15 to the column 10, that is, above and below the height h, has a predetermined length determined from the properties of the steel pipe 11 and the filled concrete 13 in the event of a fire (according to past research, about 150 mm is sufficient) The fireproof coating 19 is applied only to the outer circumferential portion of the range of length h+2 (hereinafter referred to as the fireproof area), which is the sum of the length h+2. Generally, fireproof coating work is carried out on the steel beams 15 at the joint section 18, so if the construction is also carried out on the columns 10 at the joint section 18, the beam thickness, beam coating thickness, and floor slab thickness will be added. In many cases, the construction required for the steel pipe concrete column 10 can be covered by the fire-resistant area (usually around 700 mm). Therefore, the fire resistance area (h+2
), only the portion corresponding to the difference needs to be separately coated, which requires only a small amount of work.
周知のように、火災時に鋼管コンクリート柱１
０は高温にさらされるが、途中に耐火被覆が施さ
れていると、第３図に示すように、鋼管１１の温
度Ｔは耐火域Ｌにおいて次第に低下し、耐火被覆
の両端部からだけ内側において所定の耐火時間
（１〜２時間）後鋼管１１の耐熱温度TOとほぼ等
しくなり、その中間においてはさらに低くなる。
したがつて、耐火域Ｌより２を差引いたOの
部分では、鋼材としての強度が保持される。この
pが前述の力伝達に必要な長さｈ以上であれば、
鉄鋼梁１５からの力はその範囲で鋼管１１に充填
されたコンクリート１３に伝達される。 As is well known, in the event of a fire, the steel pipe concrete column 1
0 is exposed to a high temperature, but if a fireproof coating is applied in the middle, the temperature T of the steel pipe 11 gradually decreases in the fireproof area L, as shown in FIG. After a predetermined fire resistance time (1 to 2 hours), it becomes approximately equal to the heat resistance temperature T O of the steel pipe 11, and becomes even lower in the middle.
Therefore, the strength of the steel material is maintained in the portion O , which is the fire resistance range L minus 2. this
If p is longer than the length h required for the aforementioned force transmission,
The force from the steel beam 15 is transmitted to the concrete 13 filled in the steel pipe 11 within that range.
ところで、通常時の柱耐力に対して、火災時の
柱耐力が大幅に低下するのであれば本発明の経済
的効果は小さいが、本発明は次のような考え方で
その差を縮めることができる。 By the way, the economic effect of the present invention is small if the column capacity during fire is significantly reduced compared to the column capacity under normal conditions, but the present invention can reduce the difference by using the following concept. .
通常時の柱耐力 F1＝AS・sfc＋Ac・cfC
火災時の柱耐力 F2＝Ｏ＋Ac・cf′c
（安全側の考えとして、鉄骨は全く効かないとす
る）
但し、
Aa：鋼管の断面積S
fc：鋼管の長期許容圧縮応力度
Ac：鉄管に充填したコンクリートの断面積c
fc：鋼管の充填してコンクリートの長期許容圧
縮応力度c
F′c：鋼管に充填したコンクリートの火災時（短
期）の許容圧縮応力度（一般にcf′c＞cfc）
したがつて、F1＝F2、即ちAs・sfc＋Ac・cfc＝
Ac・cf′cであれば、火災時にも通常と同じ柱耐力
を保持することになり最も経済的であるが、比較
的径厚比の大きい鋼管を使用することで、これに
近づけることができる。 Column strength under normal conditions F 1 =A S・s f c +A c・c f CColumn strength during fire F 2 =O+A c・cf′ c (To be on the safe side, assume that steel frames are not effective at all) However, , A a : Cross-sectional area of the steel pipe S f c : Long-term allowable compressive stress degree of the steel pipe A c : Cross-sectional area of the concrete filled in the steel pipe c f c : Long-term permissible compressive stress degree of the concrete filled with the steel pipe c F′ c : Allowable compressive stress of concrete filled in a steel pipe during fire (short term) (generally c f′ c > c f c ) Therefore, F 1 = F 2 , that is, A s・s f c +A c・c f c =
A c・c f′ c is the most economical as it maintains the same column strength as normal even in the event of a fire, but it is possible to get closer to this by using steel pipes with a relatively large diameter-thickness ratio. I can do it.
このように、本発明に係る鋼管コンクリート柱
は、
(1) 鋼管内面の少なくとも鉄骨梁１５から柱１０
への力伝達に必要な長さｈの範囲に突起１２を
設ける。 As described above, the steel pipe concrete column according to the present invention includes: (1) at least the steel beam 15 to the column 10 on the inner surface of the steel pipe;
The protrusion 12 is provided within a range of length h necessary for transmitting force to.
(2) 柱仕口部１８の耐火域（ｈ＋２）にのみ耐
火被覆１９を施し、その他の部分には耐火被覆
を行なわない。(2) A fireproof coating 19 is applied only to the fireproof area (h+2) of the column joint part 18, and no fireproof coating is applied to other parts.
ことを特徴とするもので、このように構成したこ
とにより、通常は鋼管コンクリート柱として高い
耐力を発揮し、火災時には耐火域で鉄鋼梁１５か
ら鋼管１１に充填したコンクリート１３に力を伝
達することができる。この場合、火災時における
強度算定上は安全側に考えて、鋼管１１に充填し
たコンクリート１３のみ考慮するものであるが、
高温によつて強度が低下した鋼材であつても、コ
ンクリート１３を包み込む鋼管１１があること
で、コンクリート１３の耐力を大きな状態に維持
することができ、單なるコンクリート柱では得ら
れない性能を発揮することができる。By configuring it in this way, it normally exhibits high strength as a steel pipe concrete column, and in the event of a fire, the force can be transmitted from the steel beam 15 to the concrete 13 filled in the steel pipe 11 in the fire-resistant area. I can do it. In this case, only the concrete 13 filled in the steel pipe 11 is considered on the safe side when calculating the strength in the event of a fire.
Even if the strength of the steel material has decreased due to high temperatures, the presence of the steel pipe 11 that envelops the concrete 13 makes it possible to maintain the strength of the concrete 13 at a high level, providing performance that cannot be obtained with a plain concrete column. can do.
上記の説明では、本発明を充填形鋼管コンクリ
ート柱に実施した場合を示したが、本発明はこれ
に限定するものではなく、圧縮軸力を主に受ける
部材であれば立体トラス材、ブレース等にも実施
することができる。 In the above explanation, the present invention is applied to a filled steel pipe concrete column, but the present invention is not limited to this, and any member that mainly receives compressive axial force can be used as a three-dimensional truss material, a brace, etc. It can also be carried out.
以上の説明から明らかなように、本発明によれ
ば次のような顕著な効果を挙げることができる。
As is clear from the above description, according to the present invention, the following remarkable effects can be achieved.
(1) 火災時等において、鋼管コンクリート柱が垂
直荷重に対して大きな耐力を有するとともに、
仕口部の限られた範囲にのみ耐火被覆を施すだ
けで、鋼管コンクリート柱が梁の保持をも可能
にする。加えて、鋼管コンクリート柱への耐火
被覆工事は、鉄骨梁の耐火被覆工事の延長とし
て行うことができ、わずかの手間で済むので、
柱の耐火コストを大巾に低減することができ
る。(1) Steel pipe concrete columns have a large capacity to withstand vertical loads in the event of a fire, etc.
By applying fireproof coating only to a limited area of the joint, the steel pipe concrete column can also hold the beam. In addition, fireproof coating work on steel pipe concrete columns can be done as an extension of fireproof coating work on steel beams, and requires only a small amount of effort.
The cost of fireproofing columns can be significantly reduced.
(2) 本発明による耐火被覆を施す部分は大半が仕
口部であり、人目につかないところであるから
簡易な仕上げでよく、この面でもコストを下げ
ることができる。(2) Most of the parts to be coated with fireproof coating according to the present invention are joint parts, which are out of sight, so a simple finishing is sufficient, and costs can be reduced in this respect as well.
(3) 細く滑らかな鋼管が露出しているので、意匠
上のスマートさが得られ、また居室部分は鋼管
が露出しているため、塗装、クロス張り等の仕
上げとなり、柱径を小さくできる。(3) Thin, smooth steel pipes are exposed, creating a smart design.Also, since the steel pipes are exposed in the living room areas, they can be finished with painting, cross-covering, etc., and the diameter of the columns can be reduced.
(4) 耐火域以外は耐火被覆が施していないので、
従来のように衝撃等により耐火被覆部分が脆弱
化したり、角部が欠落することもない。(4) Since there is no fire-resistant coating in areas other than the fire-resistant area,
Unlike in the past, the fireproof coating does not become brittle due to impact or the like, and the corners do not come off.
(5) コンクリートは鋼管内に充填するだけである
から、型枠工事等に費用が不要であり、施工が
簡単である。(5) Since concrete is simply filled into the steel pipes, there is no need for form work, etc., and construction is easy.
第１図は本発明実施例の構成説明図、第２図は
その要部の拡大図、第３図は本発明に係る柱の温
度分布を示す線図、第４図ａ，ｂ，ｃは本発明に
使用する鋼管の他の実施例を示す要部断面図、第
５図ａ，ｂ及び第６図ａ，ｂはそれぞれ従来の柱
の構造を示す縦断面図である。
１０……鋼管コンクリート柱、１１……鋼管、
１２……突起、１３……コンクリート、１５……
鉄骨梁、１６……床スラブ、１７……梁耐火被
覆、１８……仕口部、１９……柱耐火被覆。
Fig. 1 is an explanatory diagram of the configuration of an embodiment of the present invention, Fig. 2 is an enlarged view of the main part thereof, Fig. 3 is a diagram showing the temperature distribution of the column according to the present invention, and Fig. 4 a, b, and c are FIGS. 5a and 6b are longitudinal sectional views showing the structure of a conventional column. 10...Steel pipe concrete column, 11...Steel pipe,
12...protrusion, 13...concrete, 15...
Steel beam, 16...floor slab, 17...beam fireproof coating, 18...joint section, 19...column fireproof coating.
Claims (1)
内部にコンクリートが充填された鋼管を備え、該
鋼管の外周の前記仕口部に所定の長さを加えた耐
火域に耐火被履を施してなる鋼管コンクリート
柱。1 Having a protrusion on the inner surface of at least the joint area,
A steel pipe concrete column comprising a steel pipe filled with concrete, and a fire-resistant covering is applied to a fire-resistant area of the outer periphery of the steel pipe, which is a predetermined length added to the joint portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28207985A JPS62141235A (en) | 1985-12-17 | 1985-12-17 | steel pipe concrete column |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28207985A JPS62141235A (en) | 1985-12-17 | 1985-12-17 | steel pipe concrete column |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62141235A JPS62141235A (en) | 1987-06-24 |
| JPH0472017B2 true JPH0472017B2 (en) | 1992-11-17 |
Family
ID=17647850
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP28207985A Granted JPS62141235A (en) | 1985-12-17 | 1985-12-17 | steel pipe concrete column |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62141235A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011111729A (en) * | 2009-11-24 | 2011-06-09 | Ohbayashi Corp | Joint structure of steel pipe concrete column and steel-framed beam |
| JP2011111730A (en) * | 2009-11-24 | 2011-06-09 | Ohbayashi Corp | Steel pipe concrete column |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63272846A (en) * | 1987-05-01 | 1988-11-10 | 大和ハウス工業株式会社 | Steel-pipe reinforced concrete structure material for refractory structure |
| JPS6429559A (en) * | 1987-07-27 | 1989-01-31 | Mitsui Constr | Steel-pipe concrete post member |
| JPH01158153A (en) * | 1987-12-15 | 1989-06-21 | Mitsui Constr Co Ltd | Steel pipe concrete post |
| JPH0668193B2 (en) * | 1989-03-09 | 1994-08-31 | 清水建設株式会社 | Centrifugal formed steel rod reinforced concrete structure and its construction method |
| JPH0823178B2 (en) * | 1989-09-01 | 1996-03-06 | 鹿島建設株式会社 | Construction method for joints between columns and beams |
| JPH0742730B2 (en) * | 1989-09-12 | 1995-05-10 | 鹿島建設株式会社 | Column-beam joint structure |
| JP6565434B2 (en) * | 2015-07-30 | 2019-08-28 | 日本製鉄株式会社 | Steel structure |
| JP2023167162A (en) * | 2022-05-11 | 2023-11-24 | 清水建設株式会社 | Design method for concrete-filled steel-pipe column |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS541371A (en) * | 1977-06-04 | 1979-01-08 | Kawaguchi Gousei Kk | Apparatus for manufacturing granular material of thermoplastic synthetic resin containing glass fiber |
-
1985
- 1985-12-17 JP JP28207985A patent/JPS62141235A/en active Granted
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011111729A (en) * | 2009-11-24 | 2011-06-09 | Ohbayashi Corp | Joint structure of steel pipe concrete column and steel-framed beam |
| JP2011111730A (en) * | 2009-11-24 | 2011-06-09 | Ohbayashi Corp | Steel pipe concrete column |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62141235A (en) | 1987-06-24 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |