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鋼構造論文集 Vol. 28 (2021), No. 112

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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21 Nov. (Last 30 Days)

鋼構造論文集 Vol. 28 (2021), No. 112

桁端部に腐食劣化の生じた鋼I桁橋の腐食減肉量を踏まえた耐荷力に関する解析的検討

有村 健太郎, 大浦 涼雅, 山口 隆司

pp. 112_1-112_12

DOI:

10.11273/jssc.28.112_1

抄録

The main girders in a steel I girder bridge are connected with the slab, sway bracings and cross frames behaving together as a system. These members do not behave independently but behave as a structural system and have high redundancy. In this study, the effect of corrosion damage on load carrying capacity was evaluated using an FEM model of the bridge system assuming one or a few girders are corroded. As a result, the effect of load carrying capacity to the different corrosion damage were clarified quantitatively and an evaluation index for the load carrying capacity has been found.

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桁端部に腐食劣化の生じた鋼I桁橋の腐食減肉量を踏まえた耐荷力に関する解析的検討

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誘導加熱処理による面外ガセット溶接継手の疲労強度向上に関する検討

小原 礼, 前田 諭志, 笹嶋 純司, 清川 昇悟

pp. 112_13-112_24

DOI:

10.11273/jssc.28.112_13

抄録

Fatigue cracks are initiated due to stress concentration and tensile residual stress existing at crack initiation point, and reducing these factors leads to enhanced fatigue strength of the welded joints. The induction heating (IH) is effective to introduce compressive residual stress for welded joints, but there are some problems toward the practical use in fabrication plants or repairing sites of steel bridges. In this study, a newly developed IH application with better workability was applied to the out-of-plane welded joints specimen, and fatigue tests and FE analyses on the specimen were conducted to investigate the improving effect related with the heating conditions and the residual stresses. The results showed that the fatigue strength of the specimen was improved by 2 grades due to the change in the residual stresses.

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誘導加熱処理による面外ガセット溶接継手の疲労強度向上に関する検討

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河川距離に基づく地域別腐食環境レベルの推定

前田 健児, 鈴木 啓悟, 近藤 泰光

pp. 112_25-112_35

DOI:

10.11273/jssc.28.112_25

抄録

Effective bridge management can be achieved by grasping salt damage locally and taking a maintenance strategy according to the corrosive environment classification of the area. The purpose of this study is to understand the corrosive environment by region, and to clarify the corrosion rate by region by exposure tests using monitoring steel plates. Then, by regression analysis of the corrosion and their causes, we clarify the tendency of the corrosive environment and the amount of adhering salt, and propose a method for estimating the corrosive environment based on the river distance.

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河川距離に基づく地域別腐食環境レベルの推定

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外殻鋼管付きコンクリート杭を用いた基礎杭頭接合部の弾塑性挙動

諏訪 裕哉, 原田 幸博, 島田 侑子

pp. 112_37-112_52

DOI:

10.11273/jssc.28.112_37

抄録

The authors proposed a joint in which vertical double-rib plates are welded on the side of the steel pipe pile and the reinforcing bars connected with their edges. This method had increased the bending moment resistance of the pile head joints with less reinforcing bars. The purpose of this study is to present the calculation formula of the bending moment resistance-rotation angle relationship of the pile head joints. The bending moment resistance of the pile head joints is assumed to be through the summation of resistance of a circular reinforced concrete column with effective diameter and the bearing resistance of the embedded pile head.

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外殻鋼管付きコンクリート杭を用いた基礎杭頭接合部の弾塑性挙動

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電動工具により素地調整した腐食鋼板面へのAl-Mg 合金溶射皮膜の耐久性試験

谷本 竜也, 吉田 雅彦, 林 承燦, 鈴木 康夫, 松村 政秀, 杉浦 邦征

pp. 112_53-112_62

DOI:

10.11273/jssc.28.112_53

抄録

Corrosion protection of steel structures is a key for a long-term use of them and blast cleaning is generally used as surface preparation in recoating a deteriorated paint coating of steel bridges. However, when the blast cleaning is not available due to environmental limitations and any other reason, alternative surface preparation and corrosion protection technique are to be adopted. Then, focused on in this study is a new corrosion protection technique using thermal Al-Mg alloy sprayed coating by using grinding treatment together with high permeable sealing agent, not by the blast cleaning. Durability of the technique is verified through adhesion test and accelerated corrosion test up to 1,200 cycles.

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電動工具により素地調整した腐食鋼板面へのAl-Mg 合金溶射皮膜の耐久性試験

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34年経過した鋼道路鈑桁橋における高力六角ボルト摩擦接合継手の残存軸力に関する基礎的研究

飯田 哲也, 杉浦 邦征, 山口 隆司, 北根 安雄, 織田 博孝

pp. 112_63-112_74

DOI:

10.11273/jssc.28.112_63

抄録

This paper focuses on the residual performance of high-strength bolt friction joints, a typical joining method for steel bridges. In this study, the residual axial forces of high-strength hexagonal bolt friction joints were evaluated using steel roadway plate girder bridges that had been removed after more than 30 years of service. As a result of the investigation, it was confirmed that the residual axial forces were sufficiently higher than the design values in all except in a few cases, and that the joints of steel roadway bridges that had been in service for 30 years had sufficient residual axial forces. Additionally, it was confirmed that the residual axial force of box girder tended to be lower than that of plate girder bridges.

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34年経過した鋼道路鈑桁橋における高力六角ボルト摩擦接合継手の残存軸力に関する基礎的研究

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高周波誘導加熱を用いたリベット打鋲方法に関する基礎的検討

廣畑 幹人, 末廣 大地, 岡本 陽介, 中山 太士

pp. 112_75-112_88

DOI:

10.11273/jssc.28.112_75

抄録

For investigating riveting methods by using high-frequency induction heating (IH), a series of experiment was conducted. In the proposed methods, rivets were heated by IH before or after inserting into holes in steel plates. The temperature required for riveting could be achieved by the proposed methods. However, the temperatures were relatively low when the rivets were heated after inserting into holes in steel plates. Therefore, phase transformation and work hardening did not proceed sufficiently in these heating methods. Although the shear strengths of rivets heated by these methods were lower by 20 % than that of conventional coke heating method, the shear capacity based on yield stress was satisfied.

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高周波誘導加熱を用いたリベット打鋲方法に関する基礎的検討

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橋梁点検データに基づく鋼I桁橋における主桁-横部材取合い部の疲労損傷事例の分析

山本 亨介, 村越 潤, 上仙 靖

pp. 112_89-112_100

DOI:

10.11273/jssc.28.112_89

抄録

Fatigue damage cases in steel I-girder highway bridges have been reported mostly at main girders-cross member connection. These fatigue cracks are known as displacement-induced fatigue, and there are many uncertainties in crack propagations. In order to take appropriate action to damaged bridges, it is important to evaluate the cause and the occurrence tendency of the fatigue cracks efficiently. In this paper, for the purpose of identifying fatigue-damaged bridges with high priority for countermeasures, the relationship between the crack conditions and the structural/in-service conditions in existing bridges were investigated on the basis of periodic bridge inspection data.

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橋梁点検データに基づく鋼I桁橋における主桁-横部材取合い部の疲労損傷事例の分析

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H形鋼梁－屋根折板の接合方法が連続補剛材の回転補剛剛性に及ぼす影響の実験的検証

廖 望, 吉野 裕貴, 木村 祥裕

pp. 112_101-112_110

DOI:

10.11273/jssc.28.112_101

抄録

Non-structural elements such as folded roof plates are usually set up on the upper flange of main beams. Previous study shown that non-structural elements have bracing effect to lateral buckling of H-shaped beams as continuous braces. In the FEM analysis, folded roof plates are replaced with lateral and rotational springs in the FEM model that are fixed on the upper flanges of the H-shaped beams. However, in real case the joint between H-shaped beams and folded roof plates are using tight frames and bolts. When the torsional moment of H-shaped beam by lateral buckling occurs, the joint parts and the bolt holes will be broken easily so that the rotational bracing stiffness cannot be exerted. In this study, torsion experiments with different kinds of joints are used to find out the rotational bracing stiffness and the deformation mechanism of folded roof plates to be used as continuous braces.

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H形鋼梁－屋根折板の接合方法が連続補剛材の回転補剛剛性に及ぼす影響の実験的検証

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腐食促進剤注入による疲労き裂進展の遅延

舘石 和雄, 清水 優, 判治 剛, Takeshi HANJI

pp. 112_111-112_116

DOI:

10.11273/jssc.28.112_111

抄録

In this study, fatigue crack growth was retarded by injecting corrosion accelerator, Nitric acid (HNO3), into the crack to induce corrosion. The presence of the corrosion products is expected to reduce the crack opening width and act as a wedge to control the crack closure. Fatigue tests were carried out on the compact tension (CT) specimens. The test revealed that the corrosion process due to HNO3 injection ends after 24 hours. Then, the reduction in crack opening displacement range can be observed. Retardation in the crack growth was observed regardless of the load range and the effective stress intensity factor range (ΔKeff) at injection. Meanwhile, the retardation level tends to be affected by the ΔKeff and crack length at injection.

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腐食促進剤注入による疲労き裂進展の遅延

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