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鋼構造論文集 Vol. 4 (1997), No. 14

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. 4 (1997), No. 14

十字すみ肉溶接継手のルート部から発生する疲労亀裂の進展性状

貝沼 重信, 森 猛, 一宮 充

pp. 1-8

DOI:

10.11273/jssc1994.4.14_1

抄録

Fatigue crack initiation and propagation behavior from weld root of load-carrying fillet welded cruciform joints have been examined under the condition that stress range or stress intensity factor range is constant and stress ratio is kept high or low. Welding residual stresses in the joints, which are expected to have considerable influence on the fatigue crack propagation behavior, have also been measured by means of cutting method and analyzed by performing thermal conduction analyses and elasto-plastic stress analyses based on the finite element method.

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十字すみ肉溶接継手のルート部から発生する疲労亀裂の進展性状

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溶接継手部の疲労強度の寸法効果に関する研究

穴見 健吾, 三木 千寿

pp. 9-17

DOI:

10.11273/jssc1994.4.14_9

抄録

It is well known that fatigue strength of weld joint decreases with increasing the size of weld joint and that fatigue strength of large size girder specimens are much less than those of small joint specimens. In this study, concerning the size effect of fatigue strength, difference of stress concentration due to size and configuration of weld joint are mainly discussed. Previous fatigue test results of several types of weld joints are rearranged. According to the rearrangement, there are large differences between large scale girder specimens and small joint specimens. The difference of fatigue strength between small joint specimens can be almost evaluated by stress concentration concerning the difference of sizes of welded joints. On the other hand, difference between large scale girder specimens and small joint specimens are also affected by the presence of flange and stress condition or loading patterns.

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溶接継手部の疲労強度の寸法効果に関する研究

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梁端のひずみ速度に及ぼす素材の応力― ひずみ関係の影響

寺田 岳彦, 矢部 喜堂, 森田 耕次

pp. 19-28

DOI:

10.11273/jssc1994.4.14_19

抄録

Effects of stress-strain relationships of the steel material upon the strain rate of steel beams are discussed analytically. The parameter of the analysis is stress-strain relationships of steel materials. The results of this study are summarized as follows; 1)The stress-strain relationships have very large influence upon the strain-rate of the beams. If the material has the stress-strain relationships with plastic flow, the strain-rate of the member is extreme large. But in case of the relationship of round-house type, the strain-rate is very low. 2)During an severe earthquake, the strain-rate of beams changes. At the first cycle yielding, the strain-rate is very large. But after that the strain-rate becomes low and the influence of strain-rate becomes little.

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梁端のひずみ速度に及ぼす素材の応力― ひずみ関係の影響

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兵庫県南部地震における鋼管橋脚損傷の数値シミュレーション

池内 智行, 谷口 直子, 西村 宣男, 中川 知和

pp. 29-38

DOI:

10.11273/jssc1994.4.14_29

抄録

This paper presents the outline of damage to pipe piers caused by the Hyogoken-Nanbu Earthquake and the analysis of these piers under cyclic loading. rl'he local buckling and the peeling of paint were observed at the transitional point of the pipe thickness. The cyclic behavior of these piers is analyzed by the elasto-plastic finite element method. The analysis is done under 3 types of cyclic loading. According to the results of analysis, the buckling mode and the distribution of the yielded zone match the actual damage, and the most damaged pier is proved to have less seismic capacity.

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兵庫県南部地震における鋼管橋脚損傷の数値シミュレーション

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偏心ブレースを利用した履歴減衰型制震ダンパーの実用化

高橋 泰彦, 出中 耕太郎

pp. 39-52

DOI:

10.11273/jssc1994.4.14_39

抄録

Y-shape brace damper is a vibration control system against earth quakes. It is composed of two braces and a vertical member ( Link ) that possesses superior plastic deformation capacity and energy dissipation capacity. On the basis of a lot of experimental investigations, practical design recommendations are proposed. They contain depth to thickness ratio, restoring force characteristics, strength ratio of link to frame and equations for evaluating damage of link, in order to expect good performance of buildings. In addition, some buildings with Y- brace damper to prevent from damage of their main frames are shown.

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偏心ブレースを利用した履歴減衰型制震ダンパーの実用化

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高力ボルト接合されたH形鋼はり継手部のフランジとウェブの最大耐力に関する実験

宇田川 邦明, 山田 隆夫, 青山 高久

pp. 53-63

DOI:

10.11273/jssc1994.4.14_53

抄録

Based on the results of the tests on the bending of H-shaped steel beams with high-strength bolt joints, we proposed formulas to predict the ultimate tensile strength of flanges for outer tearing fractures, and webs for inner tearing fractures and end fractures. The applicability of the prediction formulas, which were previously obtained from the steel plate joint tests, to the flanges and webs was discussed. SS400 steel, 590Mpa-grade and 780Mpa-grade high-quality steels were used for test specimens.

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高力ボルト接合されたH形鋼はり継手部のフランジとウェブの最大耐力に関する実験

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