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鋼構造論文集 Vol. 31 (2024), No. 123

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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鋼構造論文集 Vol. 31 (2024), No. 123

ウェブに設置するバイパス部材を適用した鋼I桁下フランジ連結板取替え実験

戸田 健介, 田畑 晶子, 山口 隆司

pp. 123_1-123_12

DOI:

10.11273/jssc.31.123_1

抄録

One of the methods for replacing steel bridge members is to use attaching additional members to share the stress acting on the replacement members and replace them with new members. In this study, we conducted a steel I girder loading experiment using web bypass members to simulate lower flange connection plate replacement construction, and examined the applicability of the proposed method. As a result, the mechanical behavior of the steel I girder, stress properties, and reinforcing effects of the web bypass members at each construction step were clarified. In addition, we clarified the points that must be kept in mind when designing attaching additional members.

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ウェブに設置するバイパス部材を適用した鋼I桁下フランジ連結板取替え実験

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Ris

疲労き裂進展抵抗を高めた鋼材の活用による橋梁鋼床版のデッキ貫通き裂の疲労寿命改善の検討

ドアン ティーフィン, 栗原 康行, 兵藤 義浩, 﨑本 隆洋, 判治 剛, 田川 哲哉

pp. 123_13-123_22

DOI:

10.11273/jssc.31.123_13

抄録

Fatigue life in orthotropic steel bridge deck using a newly developed steel plate, which specially improved crack propagation rate da/dN in the low ΔK range, was examined by the structural model fatigue tests. A fatigue crack initiated at the weld root of the trough rib and deck plate was simulated. The stiffness changes during cyclic loading and the fracture surfaces suggested the fatigue life improvement in the specimen whose deck plate was replaced to the newly developed steel plate. The mechanism in which the fatigue crack resistance improvement of the deck plate reflected on the fatigue life of the structural model specimens was discussed from viewpoint of ΔK change along the fatigue crack path.

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疲労き裂進展抵抗を高めた鋼材の活用による橋梁鋼床版のデッキ貫通き裂の疲労寿命改善の検討

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母板の腐食性状が高力ボルト摩擦接合のすべり係数に与える影響

坂田 鷹起, 山口 真, 木村 元哉, 山口 隆司

pp. 123_23-123_36

DOI:

10.11273/jssc.31.123_23

抄録

This study investigated the impact of rough corrosion irregularities on the slip coefficient in high-strength bolted frictional joints of corroded railway bridges. Slip tests were conducted using test specimens joined by connecting plates coated with corrosion steel materials and inorganic zinc-rich paint. Some test specimens were re-exposed to assess the corrosion condition of the joint surface and changes in the slip coefficient. The slip coefficient using corrosion steel materials was below 0.40, and after approximately three years of re -exposure, there was a 20% increase in the slip coefficient compared to before exposure.

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母板の腐食性状が高力ボルト摩擦接合のすべり係数に与える影響

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鋼材接着接合のせん断と引張と剥離に関する試験

髙野 春菜, 渡邊 洋介, 岡崎 太一郎

pp. 123_37-123_47

DOI:

10.11273/jssc.31.123_37

抄録

A series of shear, tension and peel tests were conducted to examine the fundamental mechanical behavior of adhesively bonded steel-to-steel joints. The effects of adhesive type (epoxy or acrylic resin), type of steel substrate, surface finish of substrate (as is, shot blast or milled), adhesion thickness and adhesion length were examined from the test results. Epoxy resin was superior to acrylic resin in shear and tensile strength, but inferior in peel strength and ductility in shear. Epoxy resin was sensitive to galvanization while acrylic resin was not. Quantitative data is presented along with examples of typical failure modes.

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鋼構造論文集 Vol.31(2024), No.123

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鋼材接着接合のせん断と引張と剥離に関する試験

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間柱支持せん断履歴型ダンパーの累積損傷に及ぼす軸力の影響

田中 瑞樹, 畑中 祐紀

pp. 123_48-123_56

DOI:

10.11273/jssc.31.123_48

抄録

Recently, there are concerned that seismic motion exceeding the design external force will occur. When this seismic motion is input to a building equipped with hysteretic shear type dampers supported by stud-columns, unexpected deformations such as axial deformations of the dampers may occur. This study examines the influence of axial force on cumulative damage of hysteretic shear type dampers supported by stud-columns.

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間柱支持せん断履歴型ダンパーの累積損傷に及ぼす軸力の影響

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高力ボルトにより当て板添接されたストップホールの組合せ応力作用下での応力集中低減効果

清川 昇悟, 舘石 和雄, 判治 剛, 趙 茂伶, 川上 峻幸

pp. 123_57-123_68

DOI:

10.11273/jssc.31.123_57

抄録

To investigate the reduction of stress in drilled crack-arrest holes by applying patch plates with high-strength bolts under combined axial and shear loading, static loading tests with a plate girder and parametric finite element analyses were conducted. The stress concentration factor for drilled holes was found to be influenced by the combined action of stresses, and the effectiveness of the patch plate diminished as the ratio of the shear stress increased. This study proposed a method to accurately estimate the effect of combined stress actions on reducing stress concentration in drilled holes with patch plates.

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高力ボルトにより当て板添接されたストップホールの組合せ応力作用下での応力集中低減効果

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トポロジー最適化技術を適用した落橋防止ブラケットの形状設計

北田 幸夫, 黒川 貴大, 松村 寿男, 加藤 準治

pp. 123_69-123_80

DOI:

10.11273/jssc.31.123_69

抄録

A lightweight and exceptionally rigid cast metal configuration has been carrying out technological development through the implementation of a topology optimization technique for a bracket designed for a bridge collapse prevention system. Nonetheless, the configuration derived from rudimentary unitary analysis did not result in optimal performance when subjected to combined analysis replicating the installation state. Consequently, for the purpose of enhancing performance, formulated an optimization method encompassing meticulously devised analytical conditions. The configuration obtained through this method is approximately 30% lighter than the conventional shape, while maintains equivalent or heightened rigidity.

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トポロジー最適化技術を適用した落橋防止ブラケットの形状設計

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