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鋼構造論文集 Vol. 24 (2017), No. 93

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 Dec. (Last 30 Days)

鋼構造論文集 Vol. 24 (2017), No. 93

杭頭アンカーを拡径配置した外殻鋼管付きコンクリート杭の杭頭接合部の力学挙動

渡辺 亨, 平山 貴章, 諏訪 裕哉, 森田 耕次

pp. 93_1-93_16

DOI:

10.11273/jssc.24.93_1

抄録

The results of various experiments and FEM analysis are presented for the structural behavior of the vertical plate component connecting anchor reinforcing bar with steel composite concrete (SC) pile widening arrangement，and that of the connection between vertical plate and SC pile. The yield and ultimate strengths of the connection between SC pile and RC footing tested can be estimated，and the widening effect of the arrangement of anchor reinforcing bars by vertical plates is confirmed.

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杭頭アンカーを拡径配置した外殻鋼管付きコンクリート杭の杭頭接合部の力学挙動

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座屈拘束ブレース支持ブラケットの初期不整が鋼製ラーメン橋脚の制震性能に与える影響に関する解析的検討

渡辺 孝一, 石田 真士

pp. 93_17-93_28

DOI:

10.11273/jssc.24.93_17

抄録

Energy dissipation devices, such as high-performance buckling-restrained braces (BRBs) are expected to withstand major earthquakes three times without being replaced. For implementing the devices to bridges and other steel structures, it is important to verify the effect of reducing structural response under a ground motion. This paper presents the seismic capacity of BRBs by considering the initial imperfections of the BRB support brackets under various combinations of the BRB length, support bracket length in steel rigid-frame bridge pier. By the analyses, it was confirmed that the effect of initial imperfection is small, and we propose the BRBs had good seismic capacities in the support bracket drift angle 0.002 under level 2 earthquake motion.

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座屈拘束ブレース支持ブラケットの初期不整が鋼製ラーメン橋脚の制震性能に与える影響に関する解析的検討

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離散ばねと連続ばねの関係および座屈長さ係数評価式の提案

原口 将行, 城戸 將江, 津田 惠吾

pp. 93_29-93_38

DOI:

10.11273/jssc.24.93_29

抄録

The purposes of this study are to clarify the relationship between the effective length and bracing stiffness of braced compression members subjected to uniform axial force and to propose a formula for evaluating an effective length factor. The effective length of the members with continuous bracings and that of the members with discrete bracings are compared. Moreover, the effective length factors calculated by the proposed formula are compared with the correct values. It is shown that the evaluation accuracy for the effective length factor is within five percents.

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離散ばねと連続ばねの関係および座屈長さ係数評価式の提案

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施工段階を配慮した2回締め高力ボルトセットを用いた高力ボルト摩擦接合継手の適用性に関する研究

金城 力, 峯村 智也, 吉岡 夏樹, 山口 隆司

pp. 93_39-93_53

DOI:

10.11273/jssc.24.93_39

抄録

This study focuses on the mechanical behaivor of frictional joints with high strength bolts by using two steps bolt set. In this study, slip and relaxation tests are conducted for joints considering construction status. It has been clear that slip coefficient can exceed 0.4 in each surface preparations and construction status except the case which has miss-alliance in assembling the joints. Also, the influence of enlarged hole on strength is not observed. The relaxation of the bolt axial force is the same as previous studies.

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施工段階を配慮した2回締め高力ボルトセットを用いた高力ボルト摩擦接合継手の適用性に関する研究

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添板摩擦面にアルミ溶射を施した高力ボルト摩擦接合部のボルト配置とすべり係数に関する研究

東 清三郎, 熊井 隆

pp. 93_55-93_63

DOI:

10.11273/jssc.24.93_55

抄録

For developing high-strength bolted friction joints with much higher friction coefficients than conventional ones, slip tests of bolted friction joints with aluminum-sprayed splice plates are conducted by changing pitch of bolts and thickness of splice plates. The results show that slip coefficients are high in the case that pitch of bolts and thickness of splice plates are large. And there is a negative correlation between the friction coefficients of bolted joints and the averaged values of contact pressure which depend on pitch of bolts and thickness of splice plates.

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添板摩擦面にアルミ溶射を施した高力ボルト摩擦接合部のボルト配置とすべり係数に関する研究

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さび鋼板面に対するコールドスプレー法の防食皮膜形成に関する実験的研究

下里 哲弘, 日和 裕介, 有住 康則, 山城 慶

pp. 93_65-93_72

DOI:

10.11273/jssc.24.93_65

抄録

Bridge girder ends and high-strength bolts are one of the major weak points against corrosion. Therefore, it is necessary to develop the anticorrosion technique for them. In this study, we fo- cused on Cold Spray technique, which can form a metallic film, as a corrosion protection film-forming method. Cold Spray technique with mixed particles of zinc and alumina particles was applied to rust steel plate surfaces. In order to evaluate the abilities of abrasive blast-cleaning and anticorrosion property and to clarify its adhesion mechanism, cross-section observation by SEM, adhesion and accelerating corrosion tests were carried out.

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さび鋼板面に対するコールドスプレー法の防食皮膜形成に関する実験的研究

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鋼床版上面の架設用吊金具残し部の疲労耐久性に関する実験的検討

井口 進, 内田 大介, 鄭 暎樹, 貝沼 重信

pp. 93_73-93_81

DOI:

10.11273/jssc.24.93_73

抄録

Recently, fatigue cracks were observed at boxing weld of the remained lifting pieces on deck plate in orthotropic steel decks. The fatigue cracks may bring traffic troubles as they propagate into the deck plate. The authors have been clarified stress condition around the remained lifting pieces by FE analysis and evaluated their fatigue life. In this study, we conducted the fatigue test with the specimens of orthotropic steel decks and examined the fatigue strength of the remained lifting pieces in consideration of deck plate thickness as an parameter in order to verify validity of the analytical results.

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鋼床版上面の架設用吊金具残し部の疲労耐久性に関する実験的検討

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疲労き裂が生じた鋼床版垂直スティフナ溶接部に対するUITの効果

大住 圭太, 森 猛, 阪間 大介

pp. 93_83-93_92

DOI:

10.11273/jssc.24.93_83

抄録

A lot of fatigue cracks have been repo巾d in welded joints between steel deck plates and vertical stiffeners of orthotropic steel deck under severe traffic load. The crack occurs at the boxing weld toe and extends to deck plate. lt is difficult to detect the crack when its tip exists along the weld toe. This fact means that it is desirable to develop the applicable method for this part in spite of the presence of the crack. In this study，in order to make clear the effect of ultrasonic impact treatment (UIT) against small fatigue crack along the weld toe， fatigue tests have been performed o n sma ll size sp ecimens modeling the w eld ed joi nts between deck plates and vertical stiffeners.

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疲労き裂が生じた鋼床版垂直スティフナ溶接部に対するUITの効果

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マタディ橋維持管理設備の改修

松本 毅, 米澤 栄二, 沖田 斉, マディアッタ・ンデレ ・ブーバ, カロンボ・ ムケバ

pp. 93_93-93_105

DOI:

10.11273/jssc.24.93_93

抄録

The Matadi Bridge, a suspension bridge in Democratic Republic of Congo, was completed in May 1983 by the Japanese ODA. The inspection facilities such as the under girder inspection vehicles, the inside girder inspection vehicles, are equipped on this bridge. As the bridge have been opened to the public for nearly 30 years, these maintenance vehicles need to be improved because some deteriorations and the consequent problems have been found and reported by OEBK which maintains the bridge. JICA(Japan International Cooperation Agency) dispatched experts to solve these problems and repaired the inspection vehicles at the site in cooperation with OEBK. This paper reports the improvement activities done by JICA Study Team.

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マタディ橋維持管理設備の改修

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