JPH01198936A - Reinforcement of flat slab pillar head part - Google Patents
Reinforcement of flat slab pillar head partInfo
- Publication number
- JPH01198936A JPH01198936A JP2460188A JP2460188A JPH01198936A JP H01198936 A JPH01198936 A JP H01198936A JP 2460188 A JP2460188 A JP 2460188A JP 2460188 A JP2460188 A JP 2460188A JP H01198936 A JPH01198936 A JP H01198936A
- Authority
- JP
- Japan
- Prior art keywords
- column
- head part
- slab
- pillar head
- flat slab
- 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.)
- Pending
Links
- 230000002787 reinforcement Effects 0.000 title description 4
- 238000004080 punching Methods 0.000 claims abstract description 16
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 15
- 239000010959 steel Substances 0.000 claims abstract description 15
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 7
- 239000000463 material Substances 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 3
- 230000006378 damage Effects 0.000 abstract 2
- 238000005452 bending Methods 0.000 abstract 1
- 230000015572 biosynthetic process Effects 0.000 abstract 1
- 230000006835 compression Effects 0.000 abstract 1
- 238000007906 compression Methods 0.000 abstract 1
- 238000005336 cracking Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 235000001674 Agaricus brunnescens Nutrition 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
Landscapes
- Rod-Shaped Construction Members (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は、フラットスラブ系の架橋を有する構造物の柱
頭部補強方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method for reinforcing the column head of a structure having a flat slab type bridge.
［従来技術］
フラットスラブ系の架構を有する構造物の柱頭部は、例
えば第５図に示すような配筋をするのが通常となってい
る。すなわち、柱畠−材１Ｇの柱頭部ｌＯの近傍では、
通常フラットスラブ全体において直交して配筋される鉄
筋１１，１２の他、特に柱頭部１０となるスラブ＋３中
において、柱頭部鵞０を横切る方向にＰＣ鋼材１４を鉄
筋Ｈに交叉配筋している。[Prior Art] The head of a column of a structure having a flat slab type frame is usually reinforced as shown in FIG. 5, for example. That is, in the vicinity of the column head lO of the column material 1G,
In addition to reinforcing bars 11 and 12 that are normally arranged orthogonally across the entire flat slab, especially in the slab +3 that becomes the column head 10, PC steel 14 is arranged crosswise to the reinforcing bars H in the direction that crosses the column head 0. There is.
このような構成は、スラブ梁としての断面に生じる斜ひ
びわれ耐力と柱周りのパンチングレアの２つに対する検
討に基づいている。通常の設計では、前者に関してはあ
まりきびしくならないが、後者については、第６図に示
すように、斜めに走るコーン状のひびわれＩ５が発生し
、スラブＩ３が抜は落ちる破壊に対する検討であって、
地震時において特に重大となるものである。This configuration is based on consideration of two factors: the diagonal crack resistance that occurs in the cross section of the slab beam, and the punching flare around the columns. In normal design, the former is not too severe, but for the latter, as shown in Fig. 6, a cone-shaped crack I5 running diagonally occurs and the slab I3 falls out.
This is especially important during earthquakes.
［発明が解決しようとする課題］
しかし、従来のフラットスラブでの配筋は、第５図に示
すような配筋で、パンチングシアに対する補強としては
十分配慮したものとはなっておらず、大地震の際にスラ
ブが抜は落ちるような破壊についての危険性が残存して
いる。[Problem to be solved by the invention] However, the reinforcement arrangement in the conventional flat slab is as shown in Fig. 5, which does not give sufficient consideration to reinforcement against punching shear, and has resulted in large problems. There remains a risk of failure, such as the slab falling off in the event of an earthquake.
［発明の構成コ
本発明は、上記問題点を解決する目的でなされたもので
あって、フラットスラブ構造において、柱頭部又はその
近傍で、予想されるパンチングシアによるひびわれ発生
断面に対して垂直面にＰＣ鋼材を配してフラットスラブ
柱頭部の補強を行うものである。[Structure of the Invention] The present invention has been made for the purpose of solving the above-mentioned problems, and is aimed at solving the above-mentioned problems. The plan is to strengthen the flat slab column head by placing prestressing steel on the top of the column.
以下図面に示す実施例により本発明を説明する。The present invention will be explained below with reference to embodiments shown in the drawings.
第１図において、１は柱部材、２は柱部材１の施したＰ
ＣｗＩ材４を配置し、定着箱抜き部５をスラブ３の雨下
側に設けてコンクリート打設後に緊張、定着し、予め柱
頭部コンクリートに圧縮力を与えることによって、パン
チングシアによるひびわれを防止、及び破壊耐力の向上
を図ることができる。すなわち、第６図に示すような柱
頭部ｌＯの下側からスラブ３の上面にきのこ形状にひろ
がりながら斜に走るひびわれＩ５をパンチングシア検討
において予想して、円弧状に予め曲げ加工を施したＰＣ
鋼材４を用いてこれに緊張を加えることにより、これが
想定される柱頭部のコンクリートのひびわれ方向と垂直
の方向で大きな圧縮力を与えることになるのである。In Fig. 1, 1 is a column member, 2 is a P applied to the column member 1.
The CwI material 4 is placed, the fixing box cutout part 5 is provided on the rain side of the slab 3, and it is tensioned and fixed after concrete is poured, and by applying compressive force to the column head concrete in advance, cracks due to punching shear are prevented. It is also possible to improve the fracture strength. In other words, the crack I5, which extends diagonally from the lower side of the column head lO to the upper surface of the slab 3 in a mushroom shape as shown in FIG.
By applying tension to this using the steel material 4, this will provide a large compressive force in a direction perpendicular to the expected cracking direction of the concrete at the column head.
ＰＣ鋼材としては、施工上、アンボンド鋼材が使いやす
いが、ポンドタイプであってもよい。又、絶対長が短か
いために、ストランドタイプよりもセット量によるロス
のない鋼棒の方が望ましい。As the PC steel material, unbonded steel material is easy to use from the viewpoint of construction, but pound type steel material may also be used. Also, since the absolute length is short, a steel bar with no loss due to set amount is more desirable than a strand type.
このようなパンチングシアに対する補強ｐｃｍ材は、少
（な（とも２方向、場合により第４図のパンチングシア
検討断面図に示すように、４方向程度に配置することが
望ましいが、これは架構されるフラットスラブに対する
パンチングシア検討の結果による。Reinforcing PCM materials for punching shear like this are preferably placed in a small number of directions (both in two directions, and in some cases in about four directions as shown in the cross-sectional view for examining punching shear in Figure 4). This is based on the results of punching shear studies for flat slabs.
第２図、第３図は他の実施例を示す。FIGS. 2 and 3 show other embodiments.
第２図で６はカラムキャピタルを示すが、定着箱抜き部
５は張り出した柱頭部２に設けられ、柱頭部２の両側で
円弧杖ＰＣ鋼材４の緊張、定粁が行われるものを示して
いる。In Fig. 2, 6 indicates the column capital, and the fixing box cutout part 5 is provided on the protruding column head 2, and the tensioning and fixing of the arcuate PC steel material 4 is performed on both sides of the column head 2. There is.
第３図で７はロッドパネルを示しているが、定着箱抜き
部５は上方で張出した柱頭部２′に設けられ、柱頭部２
′の両側で円弧状ＰＣ鋼材４の緊張、定着が行われるも
のを示している。In FIG. 3, 7 indicates a rod panel, and the fixing box cutout part 5 is provided on the column head 2' that extends upward.
The figure shows that the arc-shaped PC steel material 4 is tensioned and fixed on both sides of .
しかし、実施例１．２．３を通じて、必要なことはパン
チングシアによって予想されるひびわれ而、つまりパン
チングシア検討断面を越えて定管されることである。However, throughout Examples 1.2.3, what is required is that the cracks expected due to punching shear be fixed, that is, beyond the punching shear considered cross section.
［発明の効果コ
以上説明のように、本発明はフラットスラブ構造におけ
る柱部材の柱頭部近傍のスラブ内同志、又は柱頭同志又
は柱頭部同志の間でＰＣ鋼棒を配置することにより、パ
ンチングシア検討断面を越えて、これと直角にコンクリ
ートに圧縮力を与えることができ、パンチングシア：こ
よるスラブのひびわれ、抜は落ちを防止することができ
る。[Effects of the Invention] As explained above, the present invention can reduce punching shear by arranging PC steel rods in the slab near the column heads of column members in a flat slab structure, or between the column heads or between the column heads. Compressive force can be applied to the concrete beyond and at right angles to the cross section being considered, and punching shear can be prevented, which can cause cracking and falling of the slab.
第１図、第２図、第３図は本発明の実施例を示す。
第４図は、パンチングシア検討断面図の一例を示す。
第５図は、従来のフラットスラブでの配筋の一例を示す
説明図である。
第６図は、パンチングシアによるひびわれ説明図である
。
！・・・柱部材、２・・・柱頭部、３・・・スラブ、４
・・・ＰＣ鋼材、５・・・定着箱抜部。
夷 ４ 図
夷５図1, 2 and 3 show embodiments of the invention. FIG. 4 shows an example of a sectional view for examining punching shear. FIG. 5 is an explanatory diagram showing an example of reinforcement arrangement in a conventional flat slab. FIG. 6 is an explanatory diagram of cracks caused by punching shear. ! ...Column member, 2...Column head, 3...Slab, 4
...PC steel material, 5...Fuser box removed. Ishi 4 Ishi 5 Ishi
Claims (2)
るパンチングシアによるひびわれ発生断面に対し、柱頭
部近傍のスラブ内同志、又は柱頭部同志、又は柱頭版同
志の間で、前記予想されるパンチングシアによるひびわ
れ発生断面を越え、前記ひびわれ発生断面に対して垂直
方向にＰＣ綱材を配して、これを緊張、定着することを
特徴とするフラットスラブ柱頭部の補強方法。(1) In a flat slab structure, with respect to the cross section where cracks occur due to punching shear that is expected to occur in the column head, the punching shear that is expected to occur between comrades in the slab near the column head, or between the column heads, or between the column capital slabs. A method for reinforcing a column head of a flat slab column, which comprises: arranging a PC rope in a direction perpendicular to the cross section where the crack occurs, and tensioning and fixing it.
加工を施したＰＣ鋼棒を用いることを特徴とする特許請
求の範囲第１項記載のフラットスラブ柱頭部の補強方法
。(2) A method for reinforcing a flat slab column head according to claim 1, characterized in that a PC steel bar that has been previously bent into an arc shape or a parabolic shape is used as the PC steel material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2460188A JPH01198936A (en) | 1988-02-03 | 1988-02-03 | Reinforcement of flat slab pillar head part |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2460188A JPH01198936A (en) | 1988-02-03 | 1988-02-03 | Reinforcement of flat slab pillar head part |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01198936A true JPH01198936A (en) | 1989-08-10 |
Family
ID=12142671
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2460188A Pending JPH01198936A (en) | 1988-02-03 | 1988-02-03 | Reinforcement of flat slab pillar head part |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01198936A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2022113877A (en) * | 2018-04-25 | 2022-08-04 | 株式会社大林組 | wooden structure |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0197744A (en) * | 1987-10-07 | 1989-04-17 | Shimizu Corp | Shearing reinforcing structure of shear head section in flat plate building |
-
1988
- 1988-02-03 JP JP2460188A patent/JPH01198936A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0197744A (en) * | 1987-10-07 | 1989-04-17 | Shimizu Corp | Shearing reinforcing structure of shear head section in flat plate building |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2022113877A (en) * | 2018-04-25 | 2022-08-04 | 株式会社大林組 | wooden structure |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4406103A (en) | Shear reinforcement for concrete flat slabs | |
| US6167675B1 (en) | Steel-wood system | |
| JPH01198936A (en) | Reinforcement of flat slab pillar head part | |
| KR20000014037A (en) | Structure reinforcing method using truss of both directions | |
| JP2002070154A (en) | Fixing structure for structural steel product and joint structure | |
| JP2827851B2 (en) | Prestressed steel beam | |
| JPH10115000A (en) | Wet type connecting method of precast beam and column in reinforced-concrete constructed building | |
| JPS6241869A (en) | Reinforcement of existing structure | |
| JP2895422B2 (en) | Pillar reinforcement structure | |
| JPS591863B2 (en) | Spacer to hold column reinforcing bars in proper position | |
| JP3856745B2 (en) | Bending reinforcement method for joints between existing columns and beams or slabs | |
| JPH0819715B2 (en) | Reinforced concrete column / beam joint reinforcement structure | |
| JPH0197744A (en) | Shearing reinforcing structure of shear head section in flat plate building | |
| JPS5927819B2 (en) | Unbonded prestressed concrete method | |
| JPH06146472A (en) | Precast ferro-concrete beam | |
| JPH04128460A (en) | Reinforcing structural member | |
| JPH03279548A (en) | Joint structure of steel pipe column with slab in flat slab structure | |
| JPH0821002A (en) | Reinforcing structure in junction between reinforced concrete pole and steel beam | |
| JP3115552B2 (en) | Protective device for PC steel girder tension in PC girder | |
| JP2001073492A (en) | Reinforcing structure for flat plate joint part | |
| JPH03194039A (en) | Prestress introducing method for trussed girder | |
| JPH0762401B2 (en) | Reinforcement method for beams and flat slabs around the pillar head | |
| JPH05171682A (en) | Column-girder joint structure of rc structure | |
| JPH0460036A (en) | Hybrid multi-tendon | |
| JPH0860777A (en) | Floor slab of pc board and execution method thereof |