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鋼構造論文集 Vol. 14 (2007), No. 54

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. 14 (2007), No. 54

角形鋼管を用いた床版橋の実大載荷試験

高木 優任, 本間 宏二, 後藤 信弘

pp. 1-15

DOI:

10.11273/jssc1994.14.54_1

抄録

For rationalizing construction procedures of short span bridges, a slab bridge composed of steel square tubes was proposed. Clarifying load transfer performance and load carrying capacity of the slab structure, loading test using a real scale structure was conducted. As the result of the test, it was confirmed that the proposed slab structure has sufficient load distribution performance and load carrying capacity.

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角形鋼管を用いた床版橋の実大載荷試験

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軸圧縮力と水平力を受ける外ダイアフラム仕口の力学的特性評価

隋 偉寧, 山成 實

pp. 17-25

DOI:

10.11273/jssc1994.14.54_17

抄録

It is well known that local deformation in a steel beam-to-column connection occurs by beam flange force. In this paper, a numerical study was conducted to get important information on elasto-plastic behaviour of connections stiffened by external diaphragm using a finite element analysis program. The connections are made of circular columns and wide flange beams, connected with external diaphragms under both axial load in column and lateral force. In order to simplify the expression of P-Delta relationship of the subassemlage with bilinear model, the properties of the connections were deduced by the analytical results of 32 subassemlages, which are the value of the initial stiffness, the secondary stiffness, the yield load and the ultimate load. Finally, it was shown that the estimated relationship of P-Delta is able to trace the analysis result very well.

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軸圧縮力と水平力を受ける外ダイアフラム仕口の力学的特性評価

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圧縮を受ける鋼製円筒シェルの座屈―設計公式の比較―

サトリア エカ, 加藤 史郎, 金 倫範, 中澤 祥二

pp. 27-41

DOI:

10.11273/jssc1994.14.54_27

抄録

This paper mainly focuses on design method for buckling of a moderate thin cylindrical shell under axial compression, usually used in civil engineering fields, but not for storage or container purposes. Technically, all the dimensions are limited by a ratio of radius to thickness, RIt, between 25 and 500. Several well known design codes, such as ECCS 1988, DIN 18800/4, ENV 1993-1-6 (Eurocode3) and IASS Design Formula, are compared based on analytical results. Using the numerical approach based on elasto-plastic buckling analysis, the design parameters under various dimensions and imperfections are determined, and then the practical guidance in designing cylindrical shells is proposed, but limited only under axial compression, using those standard codes formula. Useful information such as limitation of codes, suggested reduction factors, etc is given in order to reach a safety and economic design purpose.

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圧縮を受ける鋼製円筒シェルの座屈―設計公式の比較―

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地形影響を考慮した飛来塩分量の推定と構造物への塩分付着に関する検討

中村 秀治, 藤井 堅, 緒方 琴未, 田口 義隆

pp. 43-54

DOI:

10.11273/jssc1994.14.54_43

抄録

There exist many important civil engineering steel structures which have been used for more than several decades, and the importance of proper maintenance of these structures is increasing more and more in the future. Airflow distribution around a structure is recognized as one of the factors causing the difference of corrosion state, and corrosion progresses remarkably in the salt particle flying areas. In this paper, we examined simulation methods composed of two stages to estimate the amount of wind-driven salt and adhesion of the particles to structures. The fast stage consists of numerical airflow analyses considering local geography and simulation of wind-driven salt particles based on the airflow analyses, and the second stage is simulation of adhesion of the particles to structures by cellular automata (CA). It is confirmed that the simulation methods investigated in this paper are applicable to maintenance of corroded steel structures.

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地形影響を考慮した飛来塩分量の推定と構造物への塩分付着に関する検討

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溝形鋼により補強された柱梁接合部における柱弱軸側梁の接合に関する研究

田川 浩, 侯 興国

pp. 55-68

DOI:

10.11273/jssc1994.14.54_55

抄録

This study investigates weak-axis beam-to-column connections with steel channels. For the pinned connections using a single shear plate, the bending yield strength formulas are shown and the required channel length is proposed. The rib-reinforcement for the shear plate is investigated for avoiding the failure of the channel web plate due to the axial force from the weak-axis beam. For the semi-rigid connections, stiffness formulas are derived for the connection elements as well as the rotaion of the connections. Experiments are conducted to determine the accuracy of the derived formulas of connection strength and stiffness.

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溝形鋼により補強された柱梁接合部における柱弱軸側梁の接合に関する研究

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曲げおよびねじりが同時に作用するコンクリート充填矩形断面鋼管のファイバー応力-ひずみ関係に関する実験的研究

安 永日, 松村 政秀, 北田 俊行

pp. 69-81

DOI:

10.11273/jssc1994.14.54_69

抄録

It is important to formulate the stress-strain relationship of the encased concrete of concrete-filled steel members with rectangular cross section subjected to bending and torsion simultaneously by considering confined effect due to the outer steel plates in order to simulate the elasto-plastic and finite displacement behavior up to and in the vicinity of the ultimate state of these members. Then, formulated in this paper is the stress-strain relationship of the encased concrete of these members by extending the existing theory of concrete-filled steel members subjected to pure torsion. Also carried out is a loading test on the ultimate strength of concrete-filled steel box members subjected to bending and/or torsion to verify the proposed formulation of the stress-strain relationship of the encased concrete.

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曲げおよびねじりが同時に作用するコンクリート充填矩形断面鋼管のファイバー応力-ひずみ関係に関する実験的研究

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入熱量による溶接ワイヤの化学成分の変動を考慮した溶接金属強度の推定

西田 祐三, 田渕 基嗣, 中野 利彦

pp. 83-94

DOI:

10.11273/jssc1994.14.54_83

抄録

We suggested empirical formulae estimating tensile strength and yield strength of weld metal depend on cooling time and chemical composition (mCe) of weld metal. The cooling time is estimated by plate thickness, heat input and interpass temperature. However, the carbon equivalent of the weld metal mCeq can't be esitmmated by the chemical composition of weld wire(wCeq), because wSi and wMn are oxidized and WC, wMo are diluted to the steel plate. In this paper, for the purpose of simple estimation of strength of weld metal, mCeq is estimated by heat input and WCeq. As a result, the chart to predict the strength of the weld metal as a variable on interpass temperature and wCeq is suggested.

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入熱量による溶接ワイヤの化学成分の変動を考慮した溶接金属強度の推定

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ボルト締めストップホール法で補修した組合せ応力場にある面外ガセット溶接継手部の疲労強度評価式

森 猛, 内田 大介, 池谷 岳史

pp. 95-104

DOI:

10.11273/jssc1994.14.54_95

抄録

Bolting-Stop-Hole Method i s one of useful repair methods for the fatigue crack in welded steel structures. The authors have already proposed empirical formula for estimating the fatigue strength of steel members repaired by this method under axial stress or in-plane bending stress field. In this study, for the purpose of evaluating repair effects of the method against web gusset welded joints with fatigue cracks under combined stress field (normal stress and shear stress) and indicating an expression formula for evaluation on the fatigue strength of the repaired joints, finite element stress analyses and fatigue tests have been performed on model specimens.

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ボルト締めストップホール法で補修した組合せ応力場にある面外ガセット溶接継手部の疲労強度評価式

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エネルギー吸収型桁連結装置としての鋼製ベローズの常時および地震時の力学特性

頭井 洋

pp. 105-120

DOI:

10.11273/jssc1994.14.54_105

抄録

In this paper, mechanical characteristics of steel bellows as energy absorbing bridge connecters are investigated. Steel bellows are connected between girders or between girders and abutments in order to reduce the damage of steel girders. Bending and shearing examinations, and the repeated-load examination for axial and transverse directions are carried out using the small partial model with the slit in the bolt joint. Stable sliding was reproduced in the process of the repeated-load of the axial direction, and after sliding occurred at the joint, the large strains of the steel bellows were reduced and low cycle fatigue life was improved. Design formulas concerning the yield strength and yield displacement of steel bellows for transverse directions are developed based on the principle of virtual work. The values obtained by the design formulas are compared with calculated values by FEM and their accuracy are confirmed.

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エネルギー吸収型桁連結装置としての鋼製ベローズの常時および地震時の力学特性

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超高力ボルトの創製二と機械的特性

木村 勇次, 秋山 英二, 津崎 兼彰

pp. 121-127

DOI:

10.11273/jssc1994.14.54_121

抄録

A set of hexagon bolt, hexagon nut and plain washers, of which strength is 1700MPa-class, were fabricated from a 0.6%C-2%Si-1%Cr-1%Mo steel. The feature of this steel is both ultra high strength and high resistance against delayed fracture. The fabrication process and the mechanical properties that were obtained from the standard materials tests were reported in this study.

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超高力ボルトの創製二と機械的特性

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