Search Results 1-20 of 606

  • STUDY ON BENDING STRENGTH AND EVALUATION OF BOLT AXIAL FORCE FOR THE DOUBLE END PLATE CONNECTION WITH HORIZONTAL RIBS  [in Japanese]

    岑山 友紀 , 杉本 悠真 , 山口 隆司

    鋼構造論文集 27(106), 61-74, 2020-06

  • NUMERICAL SIMULATIONS OF STEEL FLOOR STRUCTURES CONSIDERING LARGE DEFORMATIONS UNDER ELEVATED TEMPERATURES IN FIRES  [in Japanese]

    TAKAGI Jiro , KAWAI Yu , MAKIUCHI Toshiki

    … The simulated stress of the reinforcement significantly increased in the center and corners of the slab, where the slab cracked and ruptured in the experiment.</p><p> 3) Shear failure of high-strength bolts is a major failure mode of simple bolted connections in fires. … The created bolt springs return the reactions in the changing principle shear directions. …

    Journal of Structural and Construction Engineering (Transactions of AIJ) (768), 287-297, 2020-02

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  • EXPERIMENTAL STUDY ON DUCTILITY OF RC MEMBERS WRAPPED BY STEEL AND HIGH STRENGTH FIBER REINFORCED MORTAR  [in Japanese]

    KASAKURA Ryota , KUROIWA Toshiyuki , TADOKORO Toshiya , UJI Kimitaka

    <p> 筆者らは,耐震補強工事の生産性向上を目的とし,新しい耐震補強工法を開発している.開発した工法は,プレキャストパネルを分割された補強鋼板とボルトを用いて既設柱の周囲に配置し,隙間に高強度繊維補強モルタルを充填するものである.工法を構成する高強度繊維補強モルタルは,橋梁等での使用を想定した指針が整備されているが,耐震補強工事に用いた事例は少なく,補強材として用いた場合の耐荷特性や変 …

    Journal of Japan Society of Civil Engineers, Ser. E2 (Materials and Concrete Structures) 76(3), 229-238, 2020

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  • Joining of Taper Nut and Bolt to Ultra-high Strength Steel Sheet by Punching  [in Japanese]

    SUZUKI Yasutaka , MORI Ken-ichiro , HOSOYA Ryo , ABE Yohei

    … <p>A mechanical joining process of taper nuts and bolts to ultra-high strength steel sheets by punching was developed, because resistance projection welding generally used for joining of nuts and bolts has low joinability for the ultra-high strength sheets. … In this process, the sheet is punched with the taper nut and bolt, and the nut and bolt are joined by ironing and expanding the punched hole. …

    Journal of the Japan Society for Technology of Plasticity 61(714), 154-158, 2020

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  • An Evaluation Method for Hydrogen Embrittlement of High Strength Steel Sheets Using U-bend Specimens

    Shibayama Yuki , Hojo Tomohiko , Akiyama Eiji

    … <p>An evaluate method for hydrogen embrittlement property of high strength steel sheet has been proposed in this study. … After U-shape bending, the specimen was loaded using a bolt. … Both critical hydrogen contents tended to be decreased slightly when the applied stress was relatively high.</p> …

    ISIJ International, 2020

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  • APPLICABILITY OF PRETENSIONED BOLTED JOINTS INCLUDING DIFFERENT CONTACT FACES  [in Japanese]

    TAMURA Hiroshi , MINAMI Kuniaki , YOSHIOKA Natsuki , UCHIDA Daisuke , MORO Mitsuru , HAMA Tatsuya , HIRAO Kensho

    <p> 現在,高力ボルト摩擦接合継手においては,継手ごとに統一された接触面仕様とすることが原則となっている.しかしながら,既設橋りょうの保全工事や耐候性鋼材を裸仕様で使用した箱桁の新設工事等においては,仕様の異なる接触面を含んだ摩擦接合継手を採用することで,施工の省力化・迅速化が図れる場合が多いものと考えられる.本研究では,仕様の異なる接触面を含んだ摩擦接合継手を異種接合面継手と呼び, …

    Journal of Japan Society of Civil Engineers, Ser. A1 (Structural Engineering & Earthquake Engineering (SE/EE)) 76(2), 255-274, 2020

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  • Mechanical Property of Ultrafine Elongated Grain Structure Steel Processed by Warm Tempforming and Its Application to Ultra-High-Strength Bolt

    Kimura Yuuji , Inoue Tadanobu

    … <p>Our strategy is to enhance the fracture property of ultra-high-strength low-alloy steels with a yield strength of 1.4 GPa or over by arresting the propagation of brittle cracks in hierarchical, anisotropic, and ultrafine-grained structures. …

    ISIJ International 60(6), 1108-1126, 2020

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  • EXPERIMENTAL STUDY ON STRENGTH OF BEARING-TYPE BOLTED JOINTS BETWEEN PULTRUDED HYBRID FRP AND STEEL  [in Japanese]

    TERAGUCHI Daiki , KITANE Yasuo , MATSUI Takahiro , TATEISHI Kazuo

    <p> 本研究では,鋼構造物の補修補強用に開発した山形断面を有するハイブリッドFRP引抜成形材について,鋼材との接合部に使用するせん断力を受ける支圧ボルト接合部の耐力評価を接合部供試体の引張実験により行った.ボルト列数,ボルトの種類,せん断面数,ボルトの軸力の有無,座金の種類をパラメータとして,それらが接合部耐力に与える影響について実験的に明らかにした.ボルト軸力の導入により,ボルト孔 …

    Journal of Japan Society of Civil Engineers, Ser. A1 (Structural Engineering & Earthquake Engineering (SE/EE)) 76(5), II_95-II_104, 2020

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  • FATIGUE STRENGTH OF FRICTION TYPE HIGH STRENGTH BOLTED JOINTS WITH COMPACT BOLT SPACING AND EDGE DISTANCE  [in Japanese]

    KIYOKAWA Shogo , TATEISHI Kazuo , HANJI Takeshi , SHIMIZU Masaru

    <p> 鋼構造物の損傷対策である高力ボルトによる当て板補修において,既設部材との干渉などから,設計基準の規定よりも狭いボルト間隔や縁端距離でボルトを配置せざるを得ないケースがあるが,それによる力学的影響については不明である.本研究では,ボルト配置を現行の基準よりも狭い配置とすることが高力ボルト摩擦接合継手の疲労強度に与える影響を明らかにすることを目的として,疲労試験および有限要素解析を …

    Journal of Japan Society of Civil Engineers, Ser. A1 (Structural Engineering & Earthquake Engineering (SE/EE)) 76(2), 212-222, 2020

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  • The Accelerated Atmospheric Corrosion Testing of Al Casting Alloy and its Monitoring Method  [in Japanese]

    Shinozaki Ippei , Sakakibara Yohei , Nakayama Gen

    … Al-Si-Cu alloys are often used in combination with bolts made of high-strength, Ni-alloy for joining casing components together. … When seawater or rainwater intrudes a joint area between an Al-alloy casing and a Ni-alloy bolt, for example, the problem of galvanic corrosion may occur in and around the joint area. …

    Journal of Light Metal Welding 58(Supplement), 145s-149s, 2020

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  • Experimental study on slip and after slip behavior of high strength bolted friction type joints with extended filler plate and indirect connection  [in Japanese]

    Kozai Senju , Yamaguchi Takashi , Moriyama Hitoshi , Takai Toshikazu

    … <p>The Japanese specifications for highway bridges have been revised in 2017, the specification requires verifications of the resistances of high strength bolted joint in not only slip behavior but also after slip behavior. … In this study, tensile tests had been conducted to clarify slip and after slip behavior of high strength bolt friction type joints with extended filler plate and indirect connection. …

    Journal of Structural Engineering, A 66A(0), 70-80, 2020

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  • Effect of cross-sectional dimensions and bolt arrangement on deformed bearing limit resistance of high-strength frictional bolted joints after major slip  [in Japanese]

    Moriyama Hitoshi , Takai Toshikazu , Yamaguchi Takashi , Yu Lan

    … Ultimate limit state of high-strength frictional bolted joints should be determined considering the resistance and ductility to enhance resiliency of connected members. … Authors have proposed the new ultimate limit state which is defined by bolt hole deformation by the bearing force of bolt and can secure safey margins of both resistance and ductility. …

    Journal of Structural Engineering, A 66A(0), 507-520, 2020

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  • Experimental study on bolted tensile joints applied to the cast iron deck module connection  [in Japanese]

    Hirosawa Naoto , Yamaguchi Takashi , Tobinaga Hironobu , Murayama Minoru

    … We propose to use a high strength bolted tensile joint for the cast iron deck module connection. …

    Journal of Structural Engineering, A 66A(0), 497-506, 2020

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  • Analytical study on bending strength of the double end plate connection inserting a filler plate  [in Japanese]

    Mineyama Yuki , Sugimoto Yuma , Sugita Keiya , Azuma Hirotoshi , Egashira Keizo , Yamaguchi Takashi

    … In order to construct temporary bridges quickly, we are considering using the double end plate connection utilized high strength bolted tensile joint. … In this study, the bending strength and the behavior when filler plates were inserted on the double end plate connection was examined with FEM analysis.</p> …

    Journal of Structural Engineering, A 66A(0), 106-113, 2020

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  • Estimation of stress at edge of stop-holes in steel plate repaired by patch plates with high-strength bolts  [in Japanese]

    Yaegaki Ryota , Ishikawa Toshiyuki

    <p>Generally, longer fatigue cracks in steel bridges are repaired by stop-holes and patch plates. However, the effect of reduction of stress concentrate at stop-holes with patch plates is not cl …

    Journal of Structural Engineering, A 66A(0), 596-606, 2020

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  • Fatigue strength of stop-hole with bolting a crack under plat bending  [in Japanese]

    Ishikawa Toshiyuki , Kiyokawa Shogo , Nakatsuji Wataru

    … From the result of fatigue tests, the fatigue life of stop-hole with bolting a crack becomes longer than that of the conventional one, even though the fretting fatigue of high-strength bolt or main plate was observed. …

    Journal of Structural Engineering, A 66A(0), 586-595, 2020

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  • INVESTIGATION OF TORQUE COEFFICIENT AND MECHANICAL PROPERTY ON HOT DIP GALVANIZED HIGH STRENGTH BOLTS  [in Japanese]

    KOMINE Shoichi , MINAMI Kuniaki , ENDO Kiyoshi , YOSHIOKA Natsuki , MIYAI Daisuke , FUJINO Daichi , SHIBUYA Atsushi , HAMA Tatsuya

    <p> 土木構造物において,溶融亜鉛めっき高力ボルトF8Tは,橋梁では金属溶射を適用する場合に使用され,その他には,めっき部材を接合する二次製品で数多く適用されている.ただし,実際,どの程度のトルク係数値や機械的性質を有するのかは不明であり,また,どの程度のばらつきがあるのかといった統計データはなく,これらを把握しておくことはボルト継手の安全性・信頼性を示す上で重要である.本報告は,金 …

    Journal of Japan Society of Civil Engineers, Ser. A1 (Structural Engineering & Earthquake Engineering (SE/EE)) 76(1), 174-179, 2020

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  • LONG TERM STRUCTURAL PERFORMANCE OF FRICTION-TYPE JOINT FOR SANDWICHING STEEL PLATES  [in Japanese]

    TAGUCHI Takashi

    … The advantage of the proposed joint device is that it does not require bolt-holes and welding in the joint. … As a result, the same results as high-strength bolt were obtained.</p> …

    AIJ Journal of Technology and Design 26(62), 141-146, 2020

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  • APPLICABILITY OF TURN-OF-NUT BOLTING METHOD FOR FRICTION TYPE CONNECTION BY F10T HIGH STRENGTH BOLT  [in Japanese]

    SHIRAHATA Hiromi , MINAMI Kuniaki , FUJINO Daichi , MIYAI Daisuke , YANO Shota , YOKOTA Wataru

    <p> 本論文は,F10Tを用いナット回転角法でボルト締付けを行った高力ボルト摩擦接合接手に関する実験的研究である.本研究では,無機ジンクリッチペイントを施した同継手のナット回転角法の適用に向けた基礎データを取得することを目的として,まず,一次締めに関して,スナッグタイト(人力で力いっぱいでのボルト締付け)の適用性を調べた.次に,ボルト径およびボルト長をパラメータとした導入軸力試験およ …

    Journal of Japan Society of Civil Engineers, Ser. A1 (Structural Engineering & Earthquake Engineering (SE/EE)) 76(1), 1-14, 2020

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  • INFLUENCES OF TYPES OF JOINTS AND PLATE THICKNESS ON A NEW BOLT-TIGHTENING METHOD IN WHICH THE FINAL TIGHTENING IS EXECUTED 24 HOURS AFTER THE TEMPORARY TIGHTENING  [in Japanese]

    MINAMI Kuniaki , YOKOYAMA Hideki , AMANO Takafumi

    <p> 無機ジンクリッチペイントを施した高力ボルト摩擦接合継手は,リラクセーションによるボルト軸力低下が大きく,第1著者は,設計ボルト軸力の15%増し締めで施工すれば,ボルト継手の安全性・信頼性が向上することを示した.ただし,S10Tは所定の軸力に達した時にピンテールが破断する構造であり,より高い導入軸力での施工は困難である.そこで,一次締めを導入軸力の80%とし,24時間後に本締めを …

    Journal of Japan Society of Civil Engineers, Ser. A1 (Structural Engineering & Earthquake Engineering (SE/EE)) 76(1), 61-66, 2020

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