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鋼構造論文集 Vol. 31 (2024), No. 124

ISIJ International
belloff
オンライン版ISSN: 1884-0329
冊子版ISSN: 1880-9928
発行機関: Japanese Society of Steel Construction

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  1. Vol. 31 (2024)

    1. No.124
    2. No.123
    3. No.122
    4. No.121

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    3. No.2
    4. No.1

キーワードランキング

24 Dec. (Last 30 Days)

鋼構造論文集 Vol. 31 (2024), No. 124

近年建設された北海道内の鋼構造建築物の実態調査

佐藤 史都, 岡崎 太一郎, 松井 良太, 前田 憲太郎, 森松 信雄, 千葉 隆史, 長瀬 拓也

pp. 124_1-124_11

DOI:

10.11273/jssc.31.124_1

抄録

Steel buildings constructed in Hokkaido were surveyed in order to understand the current state of design and construction. Data on geometric, material, and structural features of 120 buildings, whose design was approved between 2010 and 2022, was extracted from design drawings. The buildings could be categorized based on the columns used: square-HSSs or Isections. The former adopted two-way moment-resisting frames. The latter tended to use braces in one of the two framing directions. The adopted design methodology, vertical loads, design lateral strength, and fundamental vibration frequency are analyzed. Trends in dimensions, steel grade, and arrangements of structural members are discussed.

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近年建設された北海道内の鋼構造建築物の実態調査

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Ris

箱形断面柱を用いた外ダイアフラム形式梁フランジ接合部の溶接部を考慮した降伏耐力評価式

大庭 諒介, 森岡 宙光, 聲高 裕治, 中野 達也, 木下 智裕

pp. 124_108-124_123

DOI:

10.11273/jssc.31.124_108

抄録

This paper targets steel beam to box-section column connections with exterior diaphragms whose depth are smaller than those of conventional ones. An evaluation method of yield strength of beam flange connections is proposed considering partial penetration welds of the exterior diaphragm. Mechanical behavior and effects of parameters on yield strength of connections are examined by a loading test and finite element analysis. As a result, it is clarified that calculated values based on the evaluation method can correspond to results of the test and the analysis within ±10% errors.

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箱形断面柱を用いた外ダイアフラム形式梁フランジ接合部の溶接部を考慮した降伏耐力評価式

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既設鋼Ⅰ桁橋の疲労耐久性評価のための荷重分配係数を用いたF荷重応力範囲の推定法に関する検討

柴田 有輝, 村越 潤, 時田 英夫

pp. 124_12-124_21

DOI:

10.11273/jssc.31.124_12

抄録

Fatigue cracks have been reported at out-of-plane welded gussets in main girders of existing steel highway bridges on severe traffic routes. This paper describes a simplified method to estimate live load stress of main girder due to the passage of the F load (F load stress) for fatigue evaluation using load distribution factor (LDF). Structural dimension data were prepared through the design of 29 bridges with various parameters such as span length, girder spacing, etc., based on the past design code. F load stress data obtained by FE analyses of 29 bridges were also prepared. Regression analyses were conducted based on the data sets, and simplified equations that provide approximate estimates for the analysis values were extracted.

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既設鋼Ⅰ桁橋の疲労耐久性評価のための荷重分配係数を用いたF荷重応力範囲の推定法に関する検討

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SUS316L製ステンレス高力ボルトの製法による特性がねじ部・首下丸み部の応力集中に及ぼす影響に関する解析的検討

小村 政孝, 林 厳, 山口 隆司

pp. 124_124-124_135

DOI:

10.11273/jssc.31.124_124

抄録

To develop a stainless steel high-strength bolt with higher corrosion resistance for use in joining stainless steel members, a prototype bolt was made from SUS316L. To increase the strength of the bolt, a wire-drawing process was used instead of the more common heat-treatment method. As a result, it was found that the elastic modulus of the shaft cross-section decreased continuously from the core to the surface. The modeling of a bolt with this feature was examined by considering various factors, and the effects of the feature on the stress concentration in the radius of the lower neck and thread were studied analytically.

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SUS316L製ステンレス高力ボルトの製法による特性がねじ部・首下丸み部の応力集中に及ぼす影響に関する解析的検討

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柱端完全溶込み溶接部の溶接方法が冷間成形角形鋼管柱の塑性変形能力に与える影響

露木 瞭太, 市川 優, 浅田 勇人, 田中 剛, 板谷 俊臣, 田渕 基嗣

pp. 124_22-124_38

DOI:

10.11273/jssc.31.124_22

抄録

Nine cantilever cold-formed rectangular HSS columns were tested under cyclic loading. The primary parameters were the welding methods, semi-automated (hand welding) and robotic welding, and the shape of the weld toe at the corner region. All specimens initiated the ductile crack from the toe of the weld at the corner and failed in a brittle manner. However, the plastic deformation capacity of specimens until the failure was consistently improved with an increase in flank angle even for the column with low fracture toughness, regardless of welding methods and the difference in the strength of the weld metal.

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柱端完全溶込み溶接部の溶接方法が冷間成形角形鋼管柱の塑性変形能力に与える影響

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高力六角ボルトセットの初期形状計測と軸力評価に関する一考察

有馬 博人, 笹谷 直央, 北根 安雄, 竹村 学, 杉浦 邦征

pp. 124_39-124_48

DOI:

10.11273/jssc.31.124_39

抄録

In order to evaluate the axial forces of high strength hexagon bolts used for bridges in service, it is necessary to evaluate their forces non-destructively. The non-destructive evaluation of axial forces of the bolts is often carried out by using vibration characteristics such as impact test and ultrasonic test from excitation. The vibration characteristics can be affected by dimensional variations of the bolts, but no case studies investigating dimensional variations have been reported. Therefore, we measured the initial shape of unused high strength hexagon bolt sets in detail, presented their statistics, and examined the evaluation of axial force using the statistics.

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高力六角ボルトセットの初期形状計測と軸力評価に関する一考察

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Iビーム橋端補剛材近傍における疲労き裂の溶接を用いた補修対策に関する検討

平野 雄大, 内田 大介, 網谷 岳夫, 豊原 匡織

pp. 124_49-124_64

DOI:

10.11273/jssc.31.124_49

抄録

In this study, we analyzed the detailed stress properties of the target part and estimated the crack initiation position by reproducibility analysis for the crack that occurred in the neck near the fulcrum of the I-beam bridge. In addition, welding repair construction tests were conducted to determine the repair method. After that, a load test was carried out on the repaired bridge, and the effect of the repair was confirmed from the difference in stress properties before and after the repair. Finite element analysis was then used to reproduce the tests and confirm detailed stress characteristics that could not be confirmed in the tests, as well as the effects of deformations occurring in the actual bridge on the stresses.

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Iビーム橋端補剛材近傍における疲労き裂の溶接を用いた補修対策に関する検討

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せん断と引張を受ける高力ボルト継手のすべり耐力向上のための継手構造詳細に関する数値解析的研究

加藤 創士, 杉本 悠真

pp. 124_65-124_79

DOI:

10.11273/jssc.31.124_65

抄録

In this study, FEM analysis was conducted using a numerical analysis model that can consider the contact pressure dependence of the friction coefficient between joint surfaces, to verify the validity of the new slip capacity formula and to study the details of joint structures that can be expected to improve the slip strength. The analysis of a small joint flange thickness, in which an enlarged washer was inserted to reduce the contact pressure when the bolt axial force is introduced, resulted in a larger slip strength than that of a large joint flange thickness. The increase in the slip strength was similar to that expected by the new slip resistance equation.

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せん断と引張を受ける高力ボルト継手のすべり耐力向上のための継手構造詳細に関する数値解析的研究

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腐食した実橋桁端部の防食下地に適用したCold Spray技術のモニタリングと防食性検証

日和 裕介, 下里 哲弘, 玉城 喜章, 木村 雅昭

pp. 124_80-124_94

DOI:

10.11273/jssc.31.124_80

抄録

Since steel bridge girder ends are weak points for corrosion, it is necessary to develop highly durable corrosion prevention techniques. The authors developed a method of restoring corrosion protection performance based on Cold Spray technology and applied it to the girder ends of an actual bridge with corrosion damage. In this study, the corrosion protection performance of the cold spray coating was demonstrated by focusing on the mechanism of corrosion damage in each structural member through continuous observation of the condition under corrosive environment for 8 years.

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腐食した実橋桁端部の防食下地に適用したCold Spray技術のモニタリングと防食性検証

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高強度鋼材を用いたH型断面柱の偏心圧縮時における耐荷力特性に関する研究

川口 華穂, 鈴木 森晶, 嶋口 儀之, 宗本 理

pp. 124_95-124_107

DOI:

10.11273/jssc.31.124_95

抄録

High-performance steel materials (SBHS, SM570) are stronger than SM490, so they are effective in improving the seismic performance of bridge structures. However, it cannot be used for seismic design of bridge piers, etc., and the performance of high-strength steel cannot be fully exhibited. In order to enable seismic design using high-performance steel materials, it is necessary to accumulate data on the plastic region of high-strength steel materials.

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高強度鋼材を用いたH型断面柱の偏心圧縮時における耐荷力特性に関する研究

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