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鋼構造論文集 Vol. 13 (2006), No. 50

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. 13 (2006), No. 50

スプリットティ形式高力ボルト引張接合部で構成ざれる角形鋼管柱H形鋼梁接合部の弾塑性挙動

新垣 忠志, 原田 幸博, 森田 耕次

pp. 1-16

DOI:

10.11273/jssc1994.13.50_1

抄録

The purpose of the present study is to develop analytical model for RHS column-to-H beam connection with split-T tension type high strength bolted connections. The analytical model proposed in this study cosists of two elastic-plastic uni-axial springs at beam ends. The mechanical properties of the elasticplastic spring governing elastic-plastic behaviour of the connection, such as yield and ultimate strengths and initial stiffness, are determined according to several previous experimental and analytical studies. In order to investigate how the connection strength depends on axial load of the column member, the elastic-plastic behaviour of the connection is also analyzed by finite element method (FEM); the analytical yield strength is applicable if an axial compression ratio is lower than 0.5, the analytical ultimate one is applicable if the axial compression ratio is lower than 0.3.

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スプリットティ形式高力ボルト引張接合部で構成ざれる角形鋼管柱H形鋼梁接合部の弾塑性挙動

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溶接組立箱形断面柱の内ダイアフラム溶接部の破断防止設計法に関する研究その2接合部の塑性解析

岡本 晴仁, 石井 匠

pp. 17-26

DOI:

10.11273/jssc1994.13.50_17

抄録

To establish a design to prevent brittle fracture in H-beam-to-welded box column connection, the stress in vicinity of joints was investigated by finite analysis in Part 1. Its results show that the plastic deformation introduced into interior diaphragm is widely expanded. Then, to estimate the local plastic strength of the beam-to-welded box column connection considering the plastic deformation of interior diaphragm by the yield line theory is proposed.

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溶接組立箱形断面柱の内ダイアフラム溶接部の破断防止設計法に関する研究その2接合部の塑性解析

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TIG処理による溶接継手の極低サイクル疲労強度の向上効果

判治 剛, 舘石 和雄, 鬼頭 和也, 南 邦明

pp. 27-34

DOI:

10.11273/jssc1994.13.50_27

抄録

In order to prevent the low cycle fatigue damage in existing steel bridge members as observed in the Hanshin-Awaji Great Earthquake in 1995, improving the fatigue strength of welded joints can be a realistic option. In this study, the effect of TIG dressing, which is one of the ways to finish the weld toe, was investigated. As a specimen, T-shape welded joint specimens were employed. Some specimens were finished with TIG dressing, and the others were left as welded. The low cycle fatigue tests were conducted for these specimens in the same conditions. The test results indicated that TIG dressing made the low cycle fatigue life of welded joints much longer.

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TIG処理による溶接継手の極低サイクル疲労強度の向上効果

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電場指紋照合法による疲労き裂の発生・進展モニタリング

奥 健太郎, 有田 圭介, 金 裕哲

pp. 35-43

DOI:

10.11273/jssc1994.13.50_35

抄録

Considering Field Signature Method (called as FSM hereinafter) to apply for monitoring initiation and propagation of fatigue crack under load, the applicability of FSM was investigated by a series of experiments. Initiation of fatigue crack under 1(mm) at the toe of welds could be detected by FSM. Moreover, propagation of the very small fatigue crack in the bridge member could be detected under the repeated loads. It was found that initiation and propagation of fatigue crack in the bridge member could be accurately monitored under live loads by FSM.

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電場指紋照合法による疲労き裂の発生・進展モニタリング

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実大鋼構造柱梁接合部の延性破壊―脆性破壊遷移実験

岩佐 州紘, 新井 佑一郎, 半貫 敏夫, 秋山 宏

pp. 45-56

DOI:

10.11273/jssc1994.13.50_45

抄録

In the Hyougoken-Nanbu Earthquake (1995), the fractural modes of failures were predomination in the damage of steel buildings. In the paper, the transition of fractural modes of steel structural elements from brittle fracture to a ductile fracture was discussed. For building material of steel, the tensile tests and Charpy-impact tests were executed in various temperatures. Finally, full-scale tests of the beam-to-column connection as a representative of structural elements were carried out in three conditions of temperature. Using the nil ductility temperature, an evaluation of failure modes on steel buildings was tried.

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実大鋼構造柱梁接合部の延性破壊―脆性破壊遷移実験

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梁フランジ幅厚比が梁の破壊性状に与える影響

井口 智晴, 田渕 基嗣, 田中 剛

pp. 57-72

DOI:

10.11273/jssc1994.13.50_57

抄録

In steel building structures, the plastic rotation capacity of H-shaped beam welded to the column is affected by failure mode. When width-to-thickness ratio of beam flange (bit) is large, local buckling of the beam flange governs the rotation capacity of the beam. On the other hand, when stocky beam section is used, fracture of the beam flange or weld at the stress concentra tion point of the beam end may occur. In this case, premature fracture of the beam flange or weld may occur before the local buckling of the beam flange, when the ductility and the toughness of the beam flange material is poor. In this study, two series of tests were carried out to investigate the boundary between the local buckling and the fracture of the beam flange.

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梁フランジ幅厚比が梁の破壊性状に与える影響

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粘弾性体を用いた問柱型制振部材の開発とその性能検証実験

田中 嘉一, 諸岡 繁洋

pp. 73-82

DOI:

10.11273/jssc1994.13.50_73

抄録

This paper presents the development of stud-type damper composed by visco-elastic material and two steel columns. The advantages of the damper are as follows. (1) Since visco-elastic material is used, a high damping effect is expected even if the amplitude at the time of vibration is small. (2) Stud-type gives high flexibility to floor planning. This damper and beam are connected by means of split-T and high-strength blots. The results of the full-scale loading tests revealed the stable hysteretic behavior and energy dissipation capacity of the damper as well as the validity of the strength values and the energy dissipation capacity estimated from the assumption that two steel columns are rigid.

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粘弾性体を用いた問柱型制振部材の開発とその性能検証実験

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圧縮,曲げ,およびねじりが作用するコンクリート充填鋼断面の部材軸方向応力・ひずみ関係に関する実験的研究

安 永日, 北田 俊行, 松村 政秀

pp. 83-93

DOI:

10.11273/jssc1994.13.50_83

抄録

It is important to investigate the structural behavior of concrete-filled steel members with transverse constraint up to and in the vicinity of the ultimate state for evaluating the strength and ductility of these members. For this purpose, the structural behavior and the ultimate strength and ductility of both concrete-filled steel box members subjected to compression and bending and concrete-filled steel box and circular members subject to torsion are investigated experimentally. The influence of the lateral constraint on the constitutive behavior of encased concrete and on the strength and ductility of the concrete-filled members with transverse constraint is verified.

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圧縮,曲げ,およびねじりが作用するコンクリート充填鋼断面の部材軸方向応力・ひずみ関係に関する実験的研究

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橋梁で使用される鋼材の機械的性質と化学成分の関係(その2:シャルピー吸収エネルギーと化学成分の関係)

南 邦明, 三木 千壽

pp. 95-104

DOI:

10.11273/jssc1994.13.50_95

抄録

In the past, we had investigated the number of 1412 steel on the basis of the mill sheet in order to clarify these steel quality, and these steel of mechanical properties, impact property and chemical compositions had been shown[1][2]. We also had discussed the relationship between mechanical properties(tensile strength, yield strength) and chemical compositions[3]. However, in these papers, the relationship between impact property and chemical compositions had not been discussed. In this paper, we investigated the relationship between impact property(Charpy absorbed energy) and chemical compositions(Carbon, Silicon, Manganese, Phosphorus and Sulfur) including PcM(Cracking Parameter of Material) and Ceq(Carbon equivalent), and these results were shown.

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橋梁で使用される鋼材の機械的性質と化学成分の関係(その2:シャルピー吸収エネルギーと化学成分の関係)

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