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鋼構造論文集 Vol. 26 (2019), No. 101

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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キーワードランキング

22 Dec. (Last 30 Days)

鋼構造論文集 Vol. 26 (2019), No. 101

サブマージアーク溶接による先組みビルトH梁端接合部の塑性変形能力

中野 達也, 田渕 基嗣, 志村 竜一, 福元 孝男, 遠山 和裕, 鎌倉 和彦, 藤沢 清二, 板谷 俊臣, 島野 幸弘, 大塚 英郎

pp. 101_1-101_14

DOI:

10.11273/jssc.26.101_1

抄録

In this paper, the mechanical properties such as the toughness and the strength of the submerged arc weld (SAW) metal are investigated. Main target is the fillet weld metal by one pass SAW used for the built-up H-shaped beam. For comparison, the JIS deposited metal is also prepared. Charpy absorbed energy vE0 of the JIS deposited metal was higher than the specified value of JIS. On the other hand, vE0 of the fillet weld metal was lower than the JIS deposited metal, and some of the fillet weld metal was lower than the specified value of JIS.

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サブマージアーク溶接による先組みビルトH梁端接合部の塑性変形能力

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サブマージアーク溶接による先組みビルトH梁端接合部の塑性変形能力

浅田 勇人, 中野 達也, 高塚 康平, 田中 剛, 田渕 基嗣

pp. 101_15-101_30

DOI:

10.11273/jssc.26.101_15

抄録

This paper investigates on the plastic deformation capacity of built-up H-shaped beam connected with RHS column. A total of sixteen specimens was tested under cyclic loading, with beam size, notch toughness and depth of penetration of submerged arc weld (SAW) as primary test variables. Test results showed that the increase in notch toughness of SAW lead to improvement of plastic deformation capacity, while the decrease in weld penetration did not correlate to decrease in plastic deformation capacity. FEA were also performed to provide insight into the impact of the beam size and the penetration of SAW on the plastic deformation capacity of the specimens.

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サブマージアーク溶接による先組みビルトH梁端接合部の塑性変形能力

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Ris

サブマージアーク溶接による先組みビルトH梁端接合部の塑性変形能力

高塚 康平, 中野 達也, 浅田 勇人, 田中 剛, 一戸 康生, 田渕 基嗣

pp. 101_31-101_42

DOI:

10.11273/jssc.26.101_31

抄録

This paper investigates the toughness of submerged arc weld metal included in preassembled type build-up H-shaped beam which prevent the premature brittle fracture of moment connection. Deformation capacities before fracture of many kind of moment connections containing rolled H-shaped section beam are analyzed statistically and the indices of the deformation capacity are defined to evaluate the toughness. The relationship between the deformation capacity of the moment connection containing pre-assembled type build-up H-shaped beam and the toughness are investigated considering with the destruction property and the effect of loading protocol using the indices, which reveals the necessary value of the toughness to prevent the premature brittle fracture.

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サブマージアーク溶接による先組みビルトH梁端接合部の塑性変形能力

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地震動に対するベローズダンパーの疲労損傷評価

頭井 洋, 田中 賢太郎, 松村 政秀, 佐合 大, 姫野 岳彦

pp. 101_43-101_56

DOI:

10.11273/jssc.26.101_43

抄録

Fatigue design method of steel bellows damper during earthquake excitations is examined. Bellows dampers are connected between a girder and an abutment in order to reduce damage of superstructures and substructures. Low-cycle fatigue properties of the bellows damper are examined based on low cycle fatigue tests of the bellows damper and nonlinear dynamic response analyses of girder bridges with the bellows damper connected at both ends. Fatigue strength of the bellows is evaluated using P/V difference method which is one of cycle counting methods and Miner's cumulative damage law. Fatigue damage evaluation is performed by three methods using plastic strains，total displacements and plastic displacements of the bellows dampers as indices respectively. Further，a damage index based on cumulative plastic displacements is proposed. Validity of the proposed damage index is verified compared with the three methods of fatigue damage evaluation.

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地震動に対するベローズダンパーの疲労損傷評価

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座屈拘束ブレースで制震化した鋼製ラーメン橋脚の変形性能

渡辺 孝一, 浅井 駿弥, 石田 真士

pp. 101_57-101_68

DOI:

10.11273/jssc.26.101_57

抄録

The use of buckling-restrained braces (BRBs) as energy dissipation dampers is attempted for seismic performance improving of steel rigid-frame piers. In this study, the effectiveness of BRBs which connected the steel rigid-frame piers with gusset-plate to protect the structures under cyclic loading is examined by test. Compared with load carrying capacity of the original structure, the strengthened model with BRBs is equivalent to deformation capacity and ultimate strength. After the test, it was found that further attention should be paid to the design of the stiffener for suppresses out-of-plane deformation of the gusset-plates.

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座屈拘束ブレースで制震化した鋼製ラーメン橋脚の変形性能

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火災加熱を受けた高強度鋼材の材料特性の評価に関する一提案

葛 漢彬, 鈴木 元哉, 康 瀾, 川澄 亮太

pp. 101_69-101_78

DOI:

10.11273/jssc.26.101_69

抄録

This study is aimed at evaluating the residual properties of high strength structure steel (HSSS) after a fire. Tensile coupons obtained from the HSSS Q690 sheets were heated to various temperatures up to 900 °C, and then were cooled down in furnace to ambient temperature. Tensile coupon tests were carried out to obtain their post-fire mechanical properties and ductile fracture behaviors. Test results showed that the HSSS can keep the unchanged mechanical properties after it experiences temperatures up to 600 °C. As a result, prediction equations are obtained to evaluate the post-fire properties of HSSS.

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火災加熱を受けた高強度鋼材の材料特性の評価に関する一提案

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火災を想定した加熱冷却履歴を受けた橋梁用高降伏点鋼の機械的性質

廣畑 幹人, 寺口 大輝, 北根 安雄

pp. 101_79-101_86

DOI:

10.11273/jssc.26.101_79

抄録

For investigating effect of heating and cooling process simulating fire on mechanical properties of Steels for Bridge High Performance Structure (SBHS), a series of experiment was carried out. The heating of 600℃ did not change the mechanical properties of SBHS from those without heating and cooling. The heating of 900℃ and air cooling decreased the mechanical properties of SBHS due to softening. The heating of 900℃ and water cooling increased the ultimate strength due to hardening; however, it decreased the yield stress and elongation of SBHS to the level below that required by JIS.

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火災を想定した加熱冷却履歴を受けた橋梁用高降伏点鋼の機械的性質

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