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鋼構造論文集 Vol. 20 (2013), No. 77

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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16 May. (Last 30 Days)

鋼構造論文集 Vol. 20 (2013), No. 77

溶接部の止端形状が地震時脆性破壊の発生限界状態に及ぼす影響

田村 洋, 佐々木 栄一, 山田 均, 勝地 弘

pp. 77_1-77_14

DOI:

10.11273/jssc.20.77_1

抄録

During the Northridge earthquake and the Kobe earthquake unexpected brittle fractures occurred in a number of steel structures. The brittle fracture during earthquakes initiates from a shallower initial crack than that of well-known brittle fractures. This study addresses the shallow crack tip stress field at brittle fracture transition. The crack tip stress field at the instant of brittle fracture is investigated based on the experiments and FE analyses which employed specimens with precrack on notch. As a result, it was confirmed that crack value of maximum principal stress, stress triaxiality and Weibull stress at shallow crack tip is affected by the notch shape and crack depth.

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溶接部の止端形状が地震時脆性破壊の発生限界状態に及ぼす影響

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部分溶込み溶接で製作された鋼橋ブラケット基部の溶接継手の疲労強度

舘石 和雄, 判治 剛, 崔 誠珉, 吉嶺 建史, 高瀬 達也

pp. 77_15-77_24

DOI:

10.11273/jssc.20.77_15

抄録

Connections between a bracket flange and a main girder are fabricated by full penetration welds. Generally, the joints at the lower flange of the bracket are subjected to cyclic compressive stresses. It means that there is a possibility to change the welding method between the lower flange of the bracket and the main girder into partial joint penetration in terms of fatigue strength under compression. In this study, the fatigue strength of the base joints of the brackets was examined. The test results revealed that the joints have enough fatigue strength under the compressive stress even though partial joint penetration is applied there.

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部分溶込み溶接で製作された鋼橋ブラケット基部の溶接継手の疲労強度

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溝形鋼柱の曲げねじれ座屈の補剛に関する解析的研究

中園 健太, 前田 珠希, 小川 厚治

pp. 77_25-77_33

DOI:

10.11273/jssc.20.77_25

抄録

Channel steel columns utilized for industrialized steel houses have a buckling mode including bending and twisting. Their strength of flexural torsional buckling is lower than their strength of flexural buckling. However, their strength of flexural torsional buckling can be improved by stiffening members relatively easily, because they buckle in elastic range and their plate thickness is thin. This paper describes improvement on their strength of flexural torsional buckling and detail of their buckling mode by means of energy method.

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溝形鋼柱の曲げねじれ座屈の補剛に関する解析的研究

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偏心を有する鋼重層立体骨組の単純化動力学モデルの降伏曲面

江原 大輔, 小川 厚治

pp. 77_35-77_47

DOI:

10.11273/jssc.20.77_35

抄録

This paper is concerned with yield surface useful for the simplified dynamic model for 3-dimensional multi-story steel moment frames with eccentricity. The authors propose a couple of new expression of yield surface on simplified dynamic model for each story that consists of beams and columns. The yield surfaces of each story were examined through simple plastic analysis for the frame, which has multiple structural planes. To calibrate the validity of the yield surface, two kinds of frames, which consist of beam yielding mechanism and column yielding mechanism, were used. Adopting new expression of yield surface, a higher accuracy of results can be acquired.

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偏心を有する鋼重層立体骨組の単純化動力学モデルの降伏曲面

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芯材にアングルを用いた座屈拘束ブレースの性能実験と解析的検討

篠田 将旭, 渡辺 孝一, 児玉 佳大

pp. 77_49-77_61

DOI:

10.11273/jssc.20.77_49

抄録

This research proposed an additional strengthening of the brace made of angles, and vibration control performance was verified in cyclic loading test. A joint of angle-buckling restrained brace（angle-BRB） has a cross-sectional component with combining the two angles inserted a gusset. Then, the geometric symmetry section of angle-BRB prevented an eccentricity bender effect. After obtaining these static experimental results, the energy absorption capacity as a vibration control member was performed in the hybrid response test.

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芯材にアングルを用いた座屈拘束ブレースの性能実験と解析的検討

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鋼管構造物における構面非対称KK継手の局部変形耐力に関する解析的研究

鈴木 琢也, 金子 洋文, 木下 拓也, 黒川 雄太

pp. 77_63-77_73

DOI:

10.11273/jssc.20.77_63

抄録

In “Recommendation for the design and fabrication of tubular truss structures in steel (Japan)” , asymmetrical KK joint is outside the scope. However, asymmetrical KK joint may be needed for architectural design. So, in this study, the influence of asymmetry of a joint to the strength is examined by using FE analysis. First, simulation analysis of past experimental result is conducted for validity of analysis method. Then, using this analysis method, the influence of asymmetry of a joint is examined, through comparison with symmetrical joints. Moreover, an evaluation method for asymmetrical KK joint is proposed.

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鋼管構造物における構面非対称KK継手の局部変形耐力に関する解析的研究

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Ni系高耐候性鋼の化学成分の現状

南 邦明, 三木 千壽, 徳富 恭彦

pp. 77_75-77_90

DOI:

10.11273/jssc.20.77_75

抄録

Recently, many kinds of weathering steel were widely used in steel bridges. Ni-advanced weathering steel are new types of weathering steel. It was considered that the quality of these steels has been remarkably improved. However, when it had come to how much, it had not been clarified. Therefore, in the past, we had investigated Nickel-advanced weathering steel on the basis of the mill sheet in order to clarify their quality, and these steel mechanical properties had been shown[1] [2]. In this paper, we investigated the chemical compositions of these steels. Investigated component were Carbon, Silicon, Manganese, Phosphors, Sulfur, Copper, Chrome, Nickel including PCM(Cracking Parameter of Material), Ceq(Carbon equivalent) and V-value (Weathering Alloy Index), and these results were shown. We also showed the improvement factor in the quality, comparing with the conventional weathering steel data.

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Ni系高耐候性鋼の化学成分の現状

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