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鋼構造論文集 Vol. 19 (2012), No. 75

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. 19 (2012), No. 75

軸方向荷重を受ける溶接添接補修された腐食劣化鋼管杭の性能評価

陳 嘯, 伊藤 義人

pp. 75_1-75_12

DOI:

10.11273/jssc.19.75_1

抄録

Patch welding is a common method to repair corrosion-damaged steel structures. This paper investigates the performance of steel pipe piles repaired by patch welding considering the effect of the existing axial compressive loads. The performance of pipe piles is evaluated by a set of finite element (FE) analysis, and the mechanism of load transfer in the repaired pipe piles is examined. A minimum patch thickness to recover the initial stiffness and the strength of the corrosion-damaged pipe piles is proposed. Some practical issues in the welding repair design are also discussed.

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軸方向荷重を受ける溶接添接補修された腐食劣化鋼管杭の性能評価

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Ris

オンライン熱処理プロセスによる780N/mm2級鋼の低降伏比化とその建築柱部材としての局部座屈性能

津山 青史, 植田 圭治, 加村 久哉, 中川 佳

pp. 75_13-75_25

DOI:

10.11273/jssc.19.75_13

抄録

780N/mm2 Grade strength steel plates designed for earthquake-proof buildings have been developed. They provide high strength, low yield ratio, weldability and excellent toughness in welded joints. Key technology to obtain an excellent combination of mechanical properties is microstructural control of M-A (Martensite-Austenite constituent) and granular bainitic ferrite dual-phase structure through HOP (Heat-treatment On-line Process) immediately after an accelerated cooling in TMCP(Thermo-Mechanical Control Process). The developed steel plates have shown satisfactory performance for local buckling.

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オンライン熱処理プロセスによる780N/mm2級鋼の低降伏比化とその建築柱部材としての局部座屈性能

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変厚鋼板を梁フランジに用いた梁端溶接接合部の塑性変形能力と破断防止設計法

井川 大裕, 吹田 啓一郎, 多賀 謙蔵, 田邉 義和, 塚越 治夫, 坂井 悠佑

pp. 75_27-75_39

DOI:

10.11273/jssc.19.75_27

抄録

This paper presents the results of full-scale loading tests of beam-to-column subassmblages strengthened by TF (Thick-Flange) connection. TF connection is a moment frame connection with the thickness of the beam flange increased near the connection region to prevent fracture of the welded moment connection and effective to improve workability and quality of the welding. From test results, TF connection successfully avoid fracture initiated from welds and exhibited sufficient deformation capacity. The design method of the tapered thick flange is proposed to prevent a crack at the toe of the weld access hole and to keep the plastic region of the beam away form the welds.

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変厚鋼板を梁フランジに用いた梁端溶接接合部の塑性変形能力と破断防止設計法

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桁制震装置の桁温度伸縮に対する一設計法と最大応答変位予測法

頭井 洋, 田中 賢太郎, 松村 政秀, 吉田 雅彦, 佐合 大

pp. 75_41-75_53

DOI:

10.11273/jssc.19.75_41

抄録

This paper proposes a design method of steel bellows as seismic control devices for girder bridges on temperature girder deformations. Steel bellows are connected between girders and abutments in order to reduce the damage of superstructures and substructures. Local plastic strains of bellows are permitted due to temperature expansion and contraction of girders considering fatigue strength. This paper also proposes an estimation method of seismic maximum displacement of steel bellows using nonlinear response spectrum. The size of bellows can be designed based on the proposed methods and the maximum displacements are estimated using nonlinear response spectrum. The estimated values are compared with calculated values by FEM and the estimated values agree fairly well with those of the non-linear time history analyses.

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桁制震装置の桁温度伸縮に対する一設計法と最大応答変位予測法

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鋼床版デッキプレート進展き裂に対するデッキプレート増厚の効果に関する検討

村越 潤, 梁取 直樹, 石澤 俊希, 遠山 直樹, 小菅 匠

pp. 75_55-75_65

DOI:

10.11273/jssc.19.75_55

抄録

In this paper, effect of thickness of deck plate on fatigue durability of orthotropic steel deck is discussed with wheel running tests. Test specimen of this research has combinations of 16/19mm thickness deck plates and 6/8mm thickness U-shaped ribs. Wheel running tests with 4 million times loading were conducted on each part of the deck. Finite element analyses were also conducted in order to clarify effect of thickness of deck plate on local stress at weld joints connecting deck plate and U-shaped rib. It was clarified that local stresses at weld root become smaller and the crack propagation tends to slow with increase of deck plate.

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鋼床版デッキプレート進展き裂に対するデッキプレート増厚の効果に関する検討

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3%Ni系高耐候性鋼の機械的性質の現状

南 邦明, 三木 千壽, 横山 秀喜

pp. 75_67-75_77

DOI:

10.11273/jssc.19.75_67

抄録

Recently, many kinds of weathering steel were widely used in steel bridges. 1% and 3% Ni-advanced weathering steel are new types of weathering steel. It was considered that the quality of these steel have been remarkably improved. However, such improvement had not been quantitatively clarified. Therefore, in the past, we had investigated 753 of 1% Ni-advanced weathering steel on the basis of the mill sheet in order to clarify their quality, and these steel mechanical properties had been shown. In this paper, we investigated the 764 of 3% Ni-advanced weathering steel on the basis of the mill sheet. Investigated items were tensile strength, yield strength, charpy-absorbed-energy, elongation and yield ratio. We also discussed how much of these quantities were improved, comparing with the conventional weathering steel data.

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3%Ni系高耐候性鋼の機械的性質の現状

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