JP3189826U - Steel pipe concrete structure - Google Patents
Steel pipe concrete structure Download PDFInfo
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- JP3189826U JP3189826U JP2014000245U JP2014000245U JP3189826U JP 3189826 U JP3189826 U JP 3189826U JP 2014000245 U JP2014000245 U JP 2014000245U JP 2014000245 U JP2014000245 U JP 2014000245U JP 3189826 U JP3189826 U JP 3189826U
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 99
- 239000010959 steel Substances 0.000 title claims abstract description 99
- 239000004567 concrete Substances 0.000 title claims abstract description 37
- 238000003466 welding Methods 0.000 claims description 15
- 238000003780 insertion Methods 0.000 claims description 8
- 230000037431 insertion Effects 0.000 claims description 8
- 238000010586 diagram Methods 0.000 abstract description 8
- 230000002708 enhancing effect Effects 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 239000011150 reinforced concrete Substances 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 230000000452 restraining effect Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
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Abstract
【課題】構造の荷重と耐震性を強化して、荷重または振動を受けた際も鋼板とコンクリートが確実に結合される鋼管コンクリートの構造を提供する。【解決手段】ケース１０１及び斜面鋼板１１０から主に構成される。ケースは底板１０２、底板と連結されて第一方向に沿って底板両側に並行に設けられる第一側壁１０４及第二側壁１０６、及び第一側壁及び第二側壁に連結されて底板の一面と対向する頂板１０８を備える。斜面鋼板はケース内に設けられ第一方向に沿って間隔を置いて分布する。さらに複数の第一斜面鋼板群１１２の両端がそれぞれ底板及び第一側壁に連結され、複数の第二斜面鋼板群１１４は第一斜面鋼板群と対向するように設けられ、両端がそれぞれ底板及び第二側壁と連結され、複数の第三斜面鋼板群１１６の両端はそれぞれ頂板及び第一側壁と連結され、複数の第四斜面鋼板群は第三斜面鋼板群１１８と対向するように設置され、両端がそれぞれ頂板及び第二側壁と連結される。【選択図】図６PROBLEM TO BE SOLVED: To provide a structure of steel pipe concrete in which a steel plate and concrete are surely bonded even when a load or vibration is applied by enhancing the load and earthquake resistance of the structure. SOLUTION: It is mainly composed of a case 101 and a slope steel plate 110. The case is connected to the bottom plate 102, the first side wall 104 and the second side wall 106 which are connected to the bottom plate and provided in parallel on both sides of the bottom plate along the first direction, and are connected to the first side wall and the second side wall and face one surface of the bottom plate. A top plate 108 is provided. The sloped steel plates are provided in the case and distributed at intervals along the first direction. Further, both ends of the plurality of first slope steel plates 112 are connected to the bottom plate and the first side wall, respectively, and the plurality of second slope steel plates 114 are provided so as to face the first slope steel plates, and both ends are the bottom plate and the first side wall, respectively. It is connected to the two side walls, both ends of the plurality of third slope steel plates 116 are connected to the top plate and the first side wall, respectively, and the plurality of fourth slope steel plates are installed so as to face the third slope steel plate group 118, and both ends. Are connected to the top plate and the second side wall, respectively. [Selection diagram] Fig. 6
Description
本考案は、橋脚など大型の柱体構造に用いられる鋼管コンクリートの構造に関する。 The present invention relates to the structure of steel pipe concrete used for large columnar structures such as piers.
従来の鉄筋コンクリート設計構造では、鉄骨鉄筋コンクリートの設計以外に、充填型鋼管コンクリートの設計も採用される。前者が鉄骨を荷重及び抗張力のため部材として使用していることに比べて、後者の構造では、鋼管によりコンクリートに拘束力が提供される以外に、さらに鋼材の使用量を節減できる。 In the conventional reinforced concrete design structure, in addition to the design of steel reinforced concrete, the design of filled steel pipe concrete is also adopted. Compared to the former using a steel frame as a member for load and tensile strength, the latter structure can further reduce the amount of steel used in addition to providing the concrete pipe with a binding force.
しかしながら、従来の充填型鋼管コンクリート設計は、鋼管部分の設計及び応用方法が単純であり、提供される強度に限度があり、実際の設計と施工上の要求があまり満たされない。特に長時間重量がかかると軸応力によりコートする鋼板が軸方向に沿って外側に突出しやすい。よって、構造の荷重と耐震性を強化して、荷重または振動を受けた際も鋼板とコンクリートが確実に結合されるようにするためには、全体構造の強度の向上は重要な課題である。 However, the conventional filled-type steel pipe concrete design is simple in the design and application method of the steel pipe part, the strength provided is limited, and the actual design and construction requirements are not well met. In particular, when a heavy weight is applied for a long time, the steel sheet to be coated tends to protrude outward along the axial direction due to axial stress. Therefore, improving the strength of the entire structure is an important issue in order to strengthen the structural load and seismic resistance so that the steel plate and the concrete can be securely bonded even when subjected to the load or vibration.
そこで、本考案者は上記の欠点が改善可能と考え、鋭意検討を重ねた結果、合理的かつ効果的に課題を改善する本考案の提案に到った。 Therefore, the present inventor considered that the above-mentioned drawbacks could be improved, and as a result of intensive studies, he came up with a proposal for the present invention to improve the problem reasonably and effectively.
本考案は、このような従来の問題に鑑みてなされたものである。上記課題解決のため、本考案は、鋼管コンクリートの構造を提供することを主目的とする。 The present invention has been made in view of such conventional problems. In order to solve the above-mentioned problems, the present invention mainly aims to provide a steel pipe concrete structure.
上述した課題を解決し、目的を達成するために、本考案に係る鋼管コンクリートの構造は、
ケースと、前記ケース内に設けられ、第一方向に沿って間隔を置いて分布する斜面鋼板群とを含み、
前記ケースはさらに底板と、前記底板と連結され、前記第一方向に沿って前記底板の両側に並行に設けられる第一側壁及び第二側壁と、前記第一側壁及び第二側壁に連結されて前記底板の一面と対向する頂板とを含み、また、前記斜面鋼板群はさらに両端がそれぞれ前記底板及び前記第一側壁に連結される複数の第一斜面鋼板と、前記第一斜面鋼板と対向するように設けられ、両端がそれぞれ前記底板及び前記第二側壁に連結される複数の第二斜面鋼板と、両端がそれぞれ前記頂板及び前記第一側壁に連結される複数の第三斜面鋼板と前記第三斜面鋼板と対向するように設けられ、両端がそれぞれ前記頂板及び前記第二側壁に連結される複数の第四斜面鋼板を具備すること特徴とする。
In order to solve the above-mentioned problems and achieve the purpose, the structure of the steel pipe concrete according to the present invention is as follows:
A case, and a slope steel plate group provided in the case and distributed at intervals along the first direction,
The case is further connected to the bottom plate, the first side wall, the second side wall, and the first side wall and the second side wall provided in parallel to the both sides of the bottom plate along the first direction. A top plate facing one surface of the bottom plate, and the slope steel plate group is further opposed to the first slope steel plate and a plurality of first slope steel plates whose both ends are respectively connected to the bottom plate and the first side wall. A plurality of second inclined steel plates whose both ends are respectively connected to the bottom plate and the second side wall, a plurality of third inclined steel plates whose both ends are connected to the top plate and the first side wall, and the first A plurality of fourth slope steel plates are provided so as to face the three slope steel plates, and both ends are respectively connected to the top plate and the second side wall.
本考案によれば、構造体の拘束力を向上させる効果が得られる。 According to the present invention, the effect of improving the binding force of the structure can be obtained.
本考案における好適な実施の形態について、添付図面を参照して説明する。尚、以下に説明する実施の形態は、実用新案登録請求の範囲に記載された本考案の内容を限定するものではない。また、以下に説明される構成の全てが、本考案の必須要件であるとは限らない。 Preferred embodiments of the present invention will be described with reference to the accompanying drawings. The embodiment described below does not limit the contents of the present invention described in the claims of the utility model registration. In addition, all the configurations described below are not necessarily essential requirements of the present invention.
以下、本考案の鋼管コンクリートの構造を図１〜７に基づいて説明する。図１に示すように、鋼管コンクリートの構造１００はケース101を備える。前記ケース101は底板102、底板102と連結され、第一方向aに沿って両側に並行に設けられる第一側壁104及び第二側壁106を備える。また、ケース101内には複数の間隔板120も備え、両側がそれぞれ第一側壁104及び第二側壁106に連結され、第一方向aに沿って間隔を置いて設けられる。この好ましい実施例では、間隔板120は対にしてケース101の一端に設けられる。柱体は数個のケース101群で形成される場合があるため、柱体前後の両端にそれぞれ1組の間隔板120を設けることが好ましいが、柱体の長さに応じて各組の間隔板120の距離を調節してもよい。間隔板120は孔部122及び複数の挿入孔124を有し、孔部122は留保された孔にコンクリートを注入するためのものであり、挿入孔124は孔部122の四方に形成され、主鉄筋126を間隔板120に貫通させるものである(図４を参照)。このほか、間隔板120は複数の第一溶接スタッド130が、孔部122及び挿入孔124の間に設けられ、即ち、孔部122を中心とした場合、第一溶接スタッド130の分布半径は挿入孔124の分布半径を下まわる。実施例において、第一溶接スタッド130は平均的に間隔板120に分布させ、間隔板120の断面形状に合わせて分布させる。例えば、間隔板120が正方形であれば、第一溶接スタッド130も大体正方形に平均して分布する。間隔板120上の第一溶接スタッド130により、間隔板120とコンクリート間の結合力が強化される。 Hereinafter, the structure of the steel pipe concrete of this invention is demonstrated based on FIGS. As shown in FIG. 1, a steel pipe concrete structure 100 includes a case 101. The case 101 includes a bottom plate 102, a first side wall 104 and a second side wall 106 which are connected to the bottom plate 102 and are provided in parallel on both sides along the first direction a. The case 101 also includes a plurality of spacing plates 120, both sides of which are connected to the first side wall 104 and the second side wall 106, respectively, and are provided at intervals along the first direction a. In this preferred embodiment, the spacing plates 120 are provided at one end of the case 101 as a pair. Since the column body may be formed by a group of several cases 101, it is preferable to provide one set of spacing plates 120 at both ends of the column body, respectively. The distance of the plate 120 may be adjusted. The spacing plate 120 has a hole portion 122 and a plurality of insertion holes 124. The hole portion 122 is for injecting concrete into the retained holes. The insertion holes 124 are formed on four sides of the hole portion 122, and are mainly formed. The reinforcing bar 126 is passed through the spacing plate 120 (see FIG. 4). In addition, the spacing plate 120 includes a plurality of first welding studs 130 provided between the hole 122 and the insertion hole 124. That is, when the hole 122 is centered, the distribution radius of the first welding stud 130 is inserted. Below the distribution radius of the holes 124. In the embodiment, the first welding studs 130 are distributed on the interval plate 120 on the average, and are distributed according to the cross-sectional shape of the interval plate 120. For example, if the spacing plate 120 is square, the first welding studs 130 are also distributed on average in a roughly square shape. The first weld stud 130 on the spacing plate 120 enhances the bonding force between the spacing plate 120 and the concrete.
図２及び図３に示すように、ケース101内に斜面鋼板群110も第一方向aに沿って間隔を置いて分布させる。斜面鋼板群110は複数の第一斜面鋼板112、第二斜面鋼板114、第三斜面鋼板116、第四斜面鋼板118により構成される。うち、第一斜面鋼板112の両端はそれぞれ底板102及び第一側壁104に連結される。第二斜面鋼板114は第一斜面鋼板112と対向するように設けられ、第二斜面鋼板114の両端はそれぞれ底板102及び第二側壁106に連結される。第三斜面鋼板116の両端はそれぞれ頂板108(図４参照)及び第一側壁104に連結される。第四斜面鋼板118は第三斜面鋼板116と対向するように設けられ、第四斜面鋼板118の両端はそれぞれ頂板108及び第二側壁106に連結される。ケース101内の四角に設けられた斜面鋼板群110により、鋼管コンクリート構造100に対する拘束効果が向上される。 As shown in FIGS. 2 and 3, the slope steel plate group 110 is also distributed in the case 101 at intervals along the first direction a. The slope steel plate group 110 includes a plurality of first slope steel plates 112, a second slope steel plate 114, a third slope steel plate 116, and a fourth slope steel plate 118. Among these, both ends of the first slope steel plate 112 are connected to the bottom plate 102 and the first side wall 104, respectively. The second slope steel plate 114 is provided to face the first slope steel plate 112, and both ends of the second slope steel plate 114 are connected to the bottom plate 102 and the second side wall 106, respectively. Both ends of the third slope steel plate 116 are connected to the top plate 108 (see FIG. 4) and the first side wall 104, respectively. The fourth slope steel plate 118 is provided to face the third slope steel plate 116, and both ends of the fourth slope steel plate 118 are connected to the top plate 108 and the second side wall 106, respectively. The restraint effect on the steel pipe concrete structure 100 is improved by the inclined steel plate group 110 provided in the square in the case 101.
さらに、鋼管コンクリート構造100には複数の第二溶接スタッド132が含まれ、一定の間隔で均一にケース101の内面に設けられる。斜面鋼板群110を溶接する時に第二溶接スタッド132の設置が妨げられないように、先に斜面鋼板群110を設ける位置に一部の第二溶接スタッド132(図２を参照)を設け、斜面鋼板群110を全て設置した後で、他の第二溶接スタッド132(図３を参照)を設ける。よって、前記第一溶接スタッド130以外に、第二溶接スタッド132によりさらにケース101内面とコンクリート間の結合力を向上させる。 Further, the steel pipe concrete structure 100 includes a plurality of second welding studs 132, and is provided on the inner surface of the case 101 uniformly at regular intervals. A part of the second welding stud 132 (see FIG. 2) is provided at the position where the inclined steel plate group 110 is first provided so that the installation of the second welding stud 132 is not hindered when the inclined steel plate group 110 is welded. After all the steel plate groups 110 are installed, another second welding stud 132 (see FIG. 3) is provided. Therefore, in addition to the first welding stud 130, the second welding stud 132 further improves the bonding force between the inner surface of the case 101 and the concrete.
また、図３に示すように、間隔板120は第一方向aに沿って斜面鋼板群110に連結され、図２に示すように、即ち、斜面鋼板群110の両端はケース101内面と連結される以外に、斜面鋼板群110の第一方向aに沿う側の面を間隔板120に溶接することで、構造強度を向上させることも可能である。このほか、斜面鋼板群110は前記の第一方向aに沿って間隔を置いて分布させる以外に、対にした間隔板120の間にも斜面鋼板群110を設けることができ、斜面鋼板群110は第一方向aに沿う側の面を間隔板120に溶接する。 Further, as shown in FIG. 3, the spacing plate 120 is connected to the inclined steel plate group 110 along the first direction a, and as shown in FIG. 2, that is, both ends of the inclined steel plate group 110 are connected to the inner surface of the case 101. In addition, it is also possible to improve the structural strength by welding the surface of the inclined steel plate group 110 on the side along the first direction a to the spacing plate 120. In addition, the slope steel plate group 110 can be provided between the pair of spacing plates 120, in addition to the slope steel plate group 110 distributed at intervals along the first direction a. Welds the surface along the first direction a to the spacing plate 120.
なお、図４に示すように、間隔板120(図３参照)が有する各挿入孔124により、それぞれ主鉄筋126を貫通させてから、頂板108を吊る。頂板108は第一側壁104及に第二側壁106に連結されて底板102の一面と対向させ、第二溶接スタッド132は予め頂板108内面に設置しておくことが好ましい。こうすることで頂板108を吊る時第二溶接スタッド132の設置が完成する。図5に示すように、鋼管コンクリート構造100を組み立てた後、最後にコンクリートの注入作業を行って、柱体のプレキャストを完了させる。 As shown in FIG. 4, the top plate 108 is suspended after passing through the main reinforcing bars 126 through the insertion holes 124 of the spacing plate 120 (see FIG. 3). The top plate 108 is preferably connected to the first side wall 104 and the second side wall 106 so as to face one surface of the bottom plate 102, and the second welding stud 132 is preferably installed on the inner surface of the top plate 108 in advance. This completes the installation of the second welding stud 132 when the top plate 108 is suspended. As shown in FIG. 5, after assembling the steel pipe concrete structure 100, the concrete pouring operation is finally performed to complete the precast of the column.
第一斜面鋼板112と底板102の垂直距離は第一斜面鋼板112と第一側壁104の垂直距離（図６を参照）と等しい。同様に、第二斜面鋼板114、第三斜面鋼板116、第四斜面鋼板118がケース101内両側表面と連結される距離關係も第一斜面鋼板112と等しい。また、断面を正方形とする鋼管コンクリート構造100について言えば、斜面鋼板群110が形成する4つの斜辺とケース101内面は正八角形を形成することが好ましい。底板102両側と第一斜面鋼板112、第二斜面鋼板114の接合部分に挟まれる距離sは底板102の広さwの約1/3を占める。つまり、第一斜面鋼板112を例にとると、第一斜面鋼板112とそれが連結される底板102及び第一側壁104の間の距離dは底板102の広さwの1/2以下でなければならず、こうして対称的に設置すると、良好な拘束効果が得られる。 The vertical distance between the first slope steel plate 112 and the bottom plate 102 is equal to the vertical distance between the first slope steel plate 112 and the first side wall 104 (see FIG. 6). Similarly, the distance relation in which the second slope steel plate 114, the third slope steel plate 116, and the fourth slope steel plate 118 are connected to both side surfaces in the case 101 is also equal to the first slope steel plate 112. Further, regarding the steel pipe concrete structure 100 having a square cross section, it is preferable that the four oblique sides formed by the inclined steel plate group 110 and the inner surface of the case 101 form a regular octagon. The distance s sandwiched between the both sides of the bottom plate 102 and the first slope steel plate 112 and the second slope steel plate 114 occupies about 1/3 of the width w of the bottom plate 102. That is, taking the first slope steel plate 112 as an example, the distance d between the first slope steel plate 112 and the bottom plate 102 and the first side wall 104 to which the first slope steel plate 112 is connected must be less than or equal to ½ of the width w of the bottom plate 102. In this way, if it is installed symmetrically, a good restraining effect can be obtained.
断面を正方形とする鋼管コンクリート構造100は、複数の補佐鋼板119を有し、複数の補佐鋼板119の両端はそれぞれ頂板108及び底板102（図７を参照）に連結される。同時に、補佐鋼板119の構造と設置方法は斜面鋼板群110のように、第一方向aに沿って間隔を置いて設けられる。補佐鋼板119により、異なる断面の鋼管コンクリート構造100の構造強度がさらに向上され、本考案の鋼管コンクリート構造により、間隔板及びケース内面に設けられた溶接スタッドにより間隔板とコンクリート間の結合力が強化される以外に、ケース内の斜面鋼板群により鋼管コンクリート構造に対する拘束効果が強化され、全体の構造強度が向上される。 The steel pipe concrete structure 100 having a square cross section has a plurality of auxiliary steel plates 119, and both ends of the plurality of auxiliary steel plates 119 are connected to a top plate 108 and a bottom plate 102 (see FIG. 7), respectively. At the same time, the structure and installation method of the auxiliary steel plate 119 are provided at intervals along the first direction a as in the case of the inclined steel plate group 110. The structural strength of the steel pipe concrete structure 100 with different cross-sections is further improved by the auxiliary steel plate 119. The steel pipe concrete structure of the present invention enhances the bonding force between the gap plate and the concrete by the welded stud provided on the gap plate and the case inner surface. In addition, the restraint effect on the steel pipe concrete structure is strengthened by the inclined steel plate group in the case, and the overall structural strength is improved.
以上、本考案の実施形態について図面を参照して詳述したが、具体的な構成はこの実施形態に限られるものではなく、本考案の要旨を逸脱しない範囲の設計変更等も含まれる。 As mentioned above, although embodiment of this invention was explained in full detail with reference to drawings, the concrete structure is not restricted to this embodiment, The design change etc. of the range which does not deviate from the summary of this invention are included.
１００ 鋼管コンクリート構造
１０１ ケース
１０２ 底板
１０４ 第一側壁
１０６ 第二側壁
１０８ 頂板
１１０ 斜面鋼板群
１１２ 第一斜面鋼板
１１４ 第二斜面鋼板
１１６ 第三斜面鋼板
１１８ 第四斜面鋼板
１１９ 補佐鋼板
１２０ 間隔板
１２２ 孔部
１２４ 挿入孔
１２６ 主鉄筋
１３０ 第一溶接スタッド
１３２ 第二溶接スタッド
ａ 第一方向
ｓ （距離）
ｄ 距離
ｗ 広さ
100 Steel Pipe Concrete Structure 101 Case 102 Bottom Plate 104 First Side Wall 106 Second Side Wall 108 Top Plate 110 Slope Steel Plate Group 112 First Slope Steel Plate 114 Second Slope Steel Plate 116 Third Slope Steel Plate 118 Fourth Slope Steel Plate 119 Auxiliary Steel Plate 120 Spacing Plate 122 Hole Portion 124 Insertion hole 126 Main rebar 130 First weld stud 132 Second weld stud a First direction s (distance)
d Distance w Area
Claims (3)
前記ケース内に設けられ、第一方向に沿って間隔を置いて分布する斜面鋼板群とを含み、前記ケースはさらに
底板と、
前記底板と連結され、前記第一方向に沿って前記底板の両側に並行に設けられる第一側壁及び第二側壁と、
前記第一側壁及び第二側壁に連結されて前記底板の一面と対向する頂板と、
を含み、また、前記斜面鋼板群はさらに
両端がそれぞれ前記底板及び前記第一側壁に連結される複数の第一斜面鋼板と、
前記第一斜面鋼板と対向するように設けられ、両端がそれぞれ前記底板及び前記第二側壁に連結される複数の第二斜面鋼板と、
両端がそれぞれ前記頂板及び前記第一側壁に連結される複数の第三斜面鋼板と前記第三斜面鋼板と対向するように設けられ、両端がそれぞれ前記頂板及び前記第二側壁に連結される複数の第四斜面鋼板とを具備すること特徴とする鋼管コンクリートの構造。 Case and
A sloped steel plate group provided in the case and distributed at intervals along a first direction, the case further comprising a bottom plate,
A first side wall and a second side wall connected to the bottom plate and provided in parallel on both sides of the bottom plate along the first direction;
A top plate connected to the first side wall and the second side wall and facing one surface of the bottom plate;
The slope steel plate group further includes a plurality of first slope steel plates whose both ends are respectively connected to the bottom plate and the first side wall,
A plurality of second sloped steel plates provided to face the first sloped steel plate, and both ends connected to the bottom plate and the second side wall, respectively;
A plurality of third slope steel plates connected to the top plate and the first side wall and the third slope steel plates respectively opposite to each other, and a plurality of ends connected to the top plate and the second side wall, respectively. A steel pipe concrete structure comprising a fourth slope steel plate.
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| JP2014000245U JP3189826U (en) | 2014-01-21 | 2014-01-21 | Steel pipe concrete structure |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2016205100A (en) * | 2015-04-28 | 2016-12-08 | 清水建設株式会社 | Steel plate concrete structure |
| JP2019094663A (en) * | 2017-11-22 | 2019-06-20 | 国立大学法人 名古屋工業大学 | Earthquake resistant strengthening structure of hollow steel column |
| JP2019199761A (en) * | 2018-05-17 | 2019-11-21 | 国立大学法人宇都宮大学 | Plastic hinge structure of rc columnar structure and method for repairing plastic hinge part of rc columnar structure |
-
2014
- 2014-01-21 JP JP2014000245U patent/JP3189826U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2016205100A (en) * | 2015-04-28 | 2016-12-08 | 清水建設株式会社 | Steel plate concrete structure |
| JP2019094663A (en) * | 2017-11-22 | 2019-06-20 | 国立大学法人 名古屋工業大学 | Earthquake resistant strengthening structure of hollow steel column |
| JP7084596B2 (en) | 2017-11-22 | 2022-06-15 | 国立大学法人 名古屋工業大学 | Seismic retrofitting structure for hollow steel columns |
| JP2019199761A (en) * | 2018-05-17 | 2019-11-21 | 国立大学法人宇都宮大学 | Plastic hinge structure of rc columnar structure and method for repairing plastic hinge part of rc columnar structure |
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