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全文: "アンカーボルト"
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  • 松尾 英成, 浦 晟
    日本機械学会論文集 C編
    1993年 59 巻 557 号 225-231
    発行日: 1993/01/25
    公開日: 2008/02/26
    ジャーナル フリー
    A few tests were carried out to determine the strength and rigidity of reinforced concrete for foundations, the performance element of the exposed fixed column base made of a cast steel base plate, and the strength and rigidity of anchor bolts initially prestressed without constraining the shank. Stress was introduced to the reinforced concrete using a distribution plate, and its bearing strength was evaluated using the bearing surface area and the distance between the bearing-surface and reinforced concrete ends as parameters. Initial prestress was introduced into anchor bolts embedded in the reinforced foundation concrete, then a pull-out load was applied, and the elasto-plastic behavior of the bolts was clarified.
  • 原田 実, 緑川 浩史, 木村 毅, 鈴木 浩平, 清水 信行
    日本機械学会論文集 C編
    1991年 57 巻 540 号 2573-2580
    発行日: 1991/08/25
    公開日: 2008/02/21
    ジャーナル フリー
    This report deals with a fundamental study concerning the elastoplastic design of tall-structure systems, paying attention to anchor-bolt yielding during earthquakes. To investigate the dynamic behavior of the structure systems, a shaking-table test was conducted. A tall-structure model with a 1000kg concentrated mass at the top and an anchor bolt with a constricted part at the center was provided for the test. The sinusoidal sweep wave and two types of random vibrations were used as the input excitations for the shaking table. The following conclusions Were obtained from the tests. (1) When the tower model resonated and the anchor bolt deformed plastically, the natural frequency of the model fell rapidly and behaved like a rocking vibration. (2) The relationship between the dynamic tension load and the strain of the anchor bolt always remained almost constant regardless of the characteristics of the input wave. (3) The hysteresis of the structure model agreed well with the simulated hysteresis using a single-degree-of-freedom structure model. (4) The amount of energy dissipated up to the break of all anchor bolts was calculated.
  • 幸左 賢二, 西岡 勉, 田端 一雅, 脇田 和也
    構造工学論文集 A
    2008年 54A 巻 713-722
    発行日: 2008年
    公開日: 2008/08/01
    ジャーナル フリー
    To increase the shear strength of the beam, the she ar reinforcing effect of steel plate application to one side was evaluated.As the parameters, the embedded lengt h of an anchor and the number of anchors were selected. The results showed that the embedded leng th about 10 φ, is sufficient, and that the increase of shear strength is not in proportion to the incease of anchors.
  • 河野 久夫, 橘 俊明, 増田 貫志
    鋼構造論文集
    1996年 3 巻 12 号 31-38
    発行日: 1996/12/25
    公開日: 2010/06/28
    ジャーナル フリー
    We made trial products, they've parameter of the concrete strength and the edge distance mainly, on base concrete to each of anchor bolts (13φ-56φ) embedded in concrete. We made an experiment that the each of trial products received shearing force action. Consequentely we supposed two empirical equation. One is the equation on maximam shear strength of anchor bolts and the other is the equation on minimum edge distance of base concrete, when anchor bolts are filled with shear resistance. We'll report on the result.
  • 伊藤 倫夫, 北野 隆司, 田中 秀宣, 佐藤 邦昭
    鋼構造論文集
    2001年 8 巻 31 号 31-42
    発行日: 2001/09/30
    公開日: 2010/06/28
    ジャーナル フリー
    The purpose of this study is to clarify the structural performance of the exposed-type column base with U-shaped and bonded-type anchor bolts. The study is made in two steps, first to investigate the optimum anchor bolts and then full-scale column base performance examination.
  • 渡辺 亨, 中野 達也, 萩野 毅, 角屋 治克, 増田 浩志, 森田 耕次
    日本建築学会構造系論文集
    2010年 75 巻 649 号 651-660
    発行日: 2010/03/30
    公開日: 2010/06/09
    ジャーナル フリー
    In this paper, the static characteristics of new exposed column-bases were investigated by element test and cyclic loading test. The new exposed column-base used the anchor-bolt that consists of two parts, one is energy restoring part by plasticity and the other is anchorage part in the foundation concrete. The new exposed column-base exhibits spindle type restoring force characteristics by plasticity of anchor bolt, although existing exposed column-base exhibits generally slip-type restoring force characteristics by plasticity of anchor bolt.
  • 藤田 知高, 玉越 隆史, 春田 健作
    コンクリート工学
    2009年 47 巻 11 号 11_33-11_40
    発行日: 2009年
    公開日: 2012/03/27
    ジャーナル フリー
    耐震補強として,縁端拡幅用の鋼製ブラケットあるいは落橋防止ケーブル設置用の鋼部材を既設のコンクリート橋脚へあと施工アンカーボルトによって固定する場合がある。あと施工アンカーボルトは既設コンクリートへの深い削孔を要し,内部鋼材を傷つける危険があるなど施工性には課題がある。そのため,主としてせん断力が支配的な構造への採用を念頭に,定着長を150mmまで短くしたあと施工アンカーボルトの基礎的な性能を検討した。その結果,浅い位置でのコンクリートの引張破壊を防止するか,破壊起点より深部におけるアンカーボルトの付着耐力をコーン状破壊耐力以上確保すること,加えて表層の局部的な圧壊を防止することができれば,せん断抵抗が支配的な構造に用いることで,ある程度信頼性のある耐荷性能を期待できる可能性が示された。
  • 河野 久夫, 橘 俊明, 増田 貫志
    鋼構造論文集
    1999年 6 巻 22 号 1-10
    発行日: 1999/06/30
    公開日: 2011/03/01
    ジャーナル フリー
    In case the edge distance from the anchor bolts to base concrete is comparatively short, the ultimate shear strength is expected to be determined by the failing of the base concrete. Therefore, the specimens that make the edge distance from the anchor bolts(13∅-25∅) to the base concrete and the base concrete strength were established as parameters. In this paper, the experiment results are presented for when each specimen received the sharing force effect.
  • 白井 佑樹, 山田 哲, 坂田 弘安, 島田 侑子, 吉敷 祥一
    日本建築学会構造系論文集
    2015年 80 巻 717 号 1735-1744
    発行日: 2015年
    公開日: 2015/11/30
    ジャーナル フリー
     The purpose of this study is to describe the failure behavior, ultimate strength, yield strength of anchorbolts and the surrounding concrete under combined loads and the effect of reinforcement in the concrete. Monotonic loading tests were conducted for both headed and bonded anchor bolts in ordinary concrete. The ultimate strength when the anchor bolt ruptures or the bond fractures under combined loads are in good correlations with the design recommendation. However, the ultimate strengths when concrete cone failure occurs are in poor correlation with the design recommendation. New equations are proposed for evaluating the ultimate strength under combined loads. Stiffness deterioration occurs when the anchor bolts yield. The yield strength under combined loads is in good correlations with the estimates based on a beamon an elasticfoundation theory and the M-N interaction curve.
  • 加藤 勉
    コンクリート工学
    1984年 22 巻 7 号 67
    発行日: 1984/07/01
    公開日: 2013/04/26
    ジャーナル フリー
  • 角屋 治克, 渡辺 亨, 竹内 隆祐, 萩野 毅, 森田 耕次
    日本建築学会構造系論文集
    2013年 78 巻 693 号 1979-1988
    発行日: 2013/11/30
    公開日: 2014/07/10
    ジャーナル フリー
    This paper discusses the ultimate strength for the cone type fracture of base concrete from the anchorage of anchor-bolt of exposed-type column base. Nine full-scale specimens of three series were tested to examine the fracture modes and ultimate anchorage strength of exposed-type column base. Based on the test results, the estimation formula of the ultimate anchorage strength for the cone type fracture is proposed considering the contribution of punching shear strength of base concrete, bonding strength of reinforcing bars around anchor-bolts, flexural strength of main reinforcing bars of footing beam and so on. The calculated strengths from the estimation formula agree relatively well with the experimental cone-type fracture strengths.
  • 鉄骨置屋根支承部の地震時破壊挙動と耐力に関する研究 (その2)
    山下 哲郎, 白鳥 和希
    日本建築学会技術報告集
    2016年 22 巻 50 号 47-52
    発行日: 2016/02/20
    公開日: 2016/02/20
    ジャーナル フリー
    In the Part 2, the observed failure behavior of semi-fixed bearings is graphically described and the strength for horizontal force is evaluated according to the AIJ recommendation.
    The damage of base mortar was very similar to that observed after the 2011 off the Pacific coast of Tohoku Earthquake. It is found that the ultimate strength is precisely predicted following to the AIJ recommendation. However, the use of the yield strength is preferable in the strength evaluation for use of the facilities after earthquake. Since the damage of base mortar is not severe for the load level at the yield strength.
  • 田嶋 仁志, 半野 久光, 藤原 英之, 後藤 芳顯
    土木学会論文集
    1999年 1999 巻 612 号 297-311
    発行日: 1999/01/21
    公開日: 2010/08/24
    ジャーナル フリー
    単調載荷条件下での杭方式による矩形断面鋼製橋脚アンカー部の力学的挙動を明らかにするため大型模型実験を実施した. 同時に, アンカー部のモデル化について, 円形断面橋脚アンカー部で既に妥当性が確認されている Component Method と, 道路橋示方書に基本的に準拠したRC複鉄筋断面モデルの検証をおこなった. Component Method についてはここでもその妥当性が確認され, 汎用性のあるモデルであることが確認された. RC複鉄筋断面モデルについては, 材料構成則と平面保持仮定断面の設定をより実状に合致させることにより, 実挙動を比較的精度良く解析できることが判明した.
  • 白井 佑樹, 山田 哲, 坂田 弘安
    日本建築学会構造系論文集
    2016年 81 巻 724 号 993-1003
    発行日: 2016年
    公開日: 2016/06/30
    ジャーナル フリー
     Anchor bolts are used for installing structural members and facilities in concrete buildings. Under earthquakes or vibrations of equipment, anchor bolts are exposed to various kinds of force, especially shear force. The ultimate shear strength of anchor bolts has been investigated in many previous studies. However, there is little study on the stiffness that relates the shear force and the horizontal displacement. Therefore, it is difficult to evaluate the actual force of anchor bolts and the surrounding concrete in design and analysis.
     This study aims to evaluate the mechanical behavior of an anchor bolt and the surrounding concrete under shear force. The beam on elastic foundation theory (BEFT) is applied to the anchor bolt and the surrounding concrete. A headed anchor bolt and a bonded anchor bolt are focused in this study. In the BEFT, the anchor bolt is modelled by elastic beams and the concrete and adhesives by elastic embedment springs. The accuracy of the BEFT is investigated by comparing to the results of an experimental test and previous studies.
     The foundation constant of the elastic embedment springs representing the concrete and the adhesives is an important factor for the evaluation accuracy of BEFT. Some equations were proposed in previous studies. In this study, an evaluating method of the concrete foundation constant is proposed based on the concrete compressive fracture energy and the compression softening characteristics of concrete. The proposed equation gives the lower limit of the previous studies results.
     A monotonic loading test was conducted on a headed anchor bolt. The test parameter is the edge distance of the anchor bolt along the loading direction. The shear load, displacement and curvature of the anchor bolts were measured. Concrete cone failure was observed in all specimens. The curvatures and the stiffness that relates the shear force and the horizontal displacement agreed with less than 50% error with the proposed method based on BEFT.
     To apply BEFT to a bonded anchor bolt, an evaluating method of the adhesive is proposed. The proposed evaluating method shows good agreement with less than 50% error with the test results in the previous studies.
  • 浅田 勇人, 吉敷 祥一, 山田 哲
    日本建築学会構造系論文集
    2011年 76 巻 665 号 1347-1356
    発行日: 2011/07/30
    公開日: 2011/11/17
    ジャーナル フリー
    Cyclic loading tests of column bases in steel braced frames were conducted. Based on the test results, shear resistances governed by concrete edge failure of column base with various anchor spacings and reinforcement patterns were evaluated. Post-concrete edge failure behavior were also discussed to evaluate ultimate shear resistant mechanism considering the contribution of reinforcements around anchor bolts. In addition, shear resistance determined by steel yielding of anchor bolts was discussed taking bearing resistance of anchor bolt into account.
  • 田中 淳夫, 増田 浩志, 元田 徹
    鋼構造論文集
    1999年 6 巻 24 号 103-109
    発行日: 1999/12/31
    公開日: 2010/06/28
    ジャーナル フリー
    Experimental study about the exposed type column base using special anchor bold with upset threaded parts, which guarantee the full plastificatk n of the shank. Test results shows that this type of column basepelf well until large plastic deformation (dry angle of the column ≅1/25). After this loading the nuts wererelightened and additional loading cntinued At this stage the ookamn base behaved well again. From the test results of cyclic loading tests using four full size specimens, it becomes clear that the statical characteristics of this exposed-type of column base with special anchor bolts are slip models but those stiffness, yield strength and plastic defomlation rapacity are priate. The statical characteristics of this type column base after repair by retightening of nuts are also good. It means that this type of exposed-column bases have good repairable ability after earthquake damage.
  • 浅田 勇人, 吉敷 祥一, 山田 哲
    日本建築学会構造系論文集
    2010年 75 巻 654 号 1517-1525
    発行日: 2010/08/30
    公開日: 2010/10/08
    ジャーナル フリー
    This paper focuses on shear resistance of anchor bolts with deep embedment fastening steel column base to reinforced concrete foundation. The shear loading tests of a single anchor bolt were conducted to discuss effects of edge distance and reinforcements around an anchor bolt on shear capacity. From the test results, it is found that the prediction according to AIJ design provision does not adequately takes into account effects of edge distance in perpendicular to loading direction. Effective reinforcement arrangements to improve shear resistance of an anchor bolt were also investigated.
  • 沢出 稔, 十河 茂幸
    コンクリート工学
    1981年 19 巻 4 号 12-19
    発行日: 1981/04/15
    公開日: 2013/04/26
    ジャーナル フリー
    構造部, 機械・設備類等を, コンクリートや岩盤, 地盤などに固定する役目を果すアンカーボルトは, その設置方法も種々のものがある。
    本稿では, 土木・建築工事に広く用いられているコンクリート用アンカーボルトについて, 分類, 施工方法, 基本的な設計方法及び適用例等について, 現状の問題点を踏まえて述べる。
  • 鈴木 浩平, 緑川 浩史, 木村 毅, 清水 信行, 原田 実
    日本機械学会論文集 C編
    1991年 57 巻 541 号 3085-3092
    発行日: 1991/09/25
    公開日: 2008/02/21
    ジャーナル フリー
    This paper is the third report in our series of studies concerning the seismic design of tall structures such as reactor tower pressure vessels in chemical engineering plants and oil refinery complexes. Particular attention is paid to anchor-bolt yielding during earthquake excitations whose dynamic behaviour has been fairly precisely observed by shaking tests as described in the former report. In this specific work, we have proposed two types of simplified mechanical models (the single-degree-of-freedom slip-type model and the two-degree-of freedom rocking-type model) where-by inelastic energy-absorbing characteristics of the anchor bolt are simulated by referring to the experimental results. With the aid of these simplified models, numerical response analysis using the Runge-Kutta-Gill method is carried out under the similar conditions for shaking tests. As far as the structural response waveforms, inelastic loads and dynamic strains for the anchor bolts and energy-absorbing hysteresis curves are concerned, satisfactorily good agreement can be achieved between the testing results and the numerical simulation results.
  • 伊藤 賢治, 山下 哲郎, 渡辺 俊也
    日本建築学会構造系論文集
    2019年 84 巻 759 号 649-657
    発行日: 2019年
    公開日: 2019/05/30
    ジャーナル フリー

     In 2011, some roof bearings of gymnasiums suffered severe damage by the pacific coast of Tohoku earthquake. Typical damage was the elongation and break of the anchor bolts or crush of base mortar. Since gymnasiums are used as shelters for the neighboring residents in earthquake disasters, damage prevention of roof bearings are required.

     Roof bearings are the connections between the lower RC frame and the steel roof. They are similar to conventional steel exposed column bases. However, the dominant stress and the mechanism to resist the horizontal forces of the roof bearings are different from those of steel exposed column bases. The dominant stress of steel exposed column bases is axial and bending stress while shear stress of the anchor bolts is dominant for roof bearings since the vertical load is extremely lower than that in steel exposed column bases in ordinary buildings.

     In present paper, the full-scale cyclic shear loading tests of roof bearings were carried out to investigate the fracture behavior of roof bearings and the restoring force characteristics were also evaluated. Three different height (20mm, 50mm or 100mm) of the base mortar were used to compare the fracture behavior and the restoring force characteristics. Moreover, the friction tests were conducted to investigate the friction coefficient between the base mortar and base plate.

     It was found from the results of friction tests that the friction coefficient between the base mortar and the base plate was about 0.5. This result agrees very well with the friction coefficient given in the AIJ recommendation for Design of Connections in Steel Structures.

     The fracture behavior and the restoring force characteristics of roof bearings are summarized as follows. The anchor bolts were leaned after the base plate contacted the anchor bolts. After that, the base mortar cracked since the deformed anchor bolts pushed it out. After the tests, the base mortar was crushed especially outside of anchor bolts. When the base mortar height is 100mm, the test body couldn’t support the vertical load since the base mortar located in inside of anchor bolts was crushed. However, the friction coefficient of base mortar was approximately 0.5, and we assumed that the restoring force characteristics of roof bearings is the summation of strength of anchor bolts and the friction force between the base mortar and base plate.

     The anchor bolts and the base mortar were already severely damaged before the horizontal load reached the yield shear strength. Meanwhile, we observed that the anchor bolts were bended at two parts, the bottom of the base plate and the slightly below of the surface of the concrete. For the small deformation, we proposed that the restoring force characteristics of roof bearings is evaluated by the yield bending strength considering this bending mechanism. For the large deformation, we proposed that the restoring force characteristics of roof bearings is evaluated by considering the bending and axial stress of anchor bolts. These stress of anchor bolts were calculated by the generalized plastic hinge theory applying kinematic hardening.

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