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鋼構造論文集 Vol. 27 (2020), No. 105

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. 27 (2020), No. 105

繰り返し曲げを受ける鋼部材の延性破壊メカニズムに関する実験的研究

吉田 聡一郎, 藤江 渉, 賈 良玖, 葛 漢彬

pp. 105_1-105_12

DOI:

10.11273/jssc.27.105_1

抄録

This study is aimed to investigate cracking mechanism of steel members under cyclic bending. The process of crack initiation and propagation in the seven specimens are studied. The effects of notch shape and cyclic loading pattern on ductile fracture of the specimens are discussed. A large radius notch can delay crack initiation and propagation. Also, differences in loading pattern affect crack initiation and propagation. Therefore, the strength, cumulative ductility ratio and energy absorption of the specimens show different results depending on the notch shape and loading pattern.

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繰り返し曲げを受ける鋼部材の延性破壊メカニズムに関する実験的研究

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高力ボルト接合による外ダイアフラム形式柱梁接合部における角形鋼管の局部変形挙動

佐藤 由悟, 浅沼 愛実, 聲高 裕治, 岡田 忠義, 松尾 真太朗

pp. 105_13-105_28

DOI:

10.11273/jssc.27.105_13

抄録

The authors have investigated practical application of beam-to-column connection with exterior diaphragm assembled by high-strength bolts. When horizontal loads due to bending moments of beams act at this connection under seismic force, local out-of-plane deformation of square hollow section (SHS) columns may occur. In this paper, experiment and FEM analysis with a part of SHS column were conducted to verify the effects of several parameters on local deformation behavior. Furthermore, based on the stress distribution obtained by the FEM analysis, a method of evaluating the strength of SHS by local deformation was proposed.

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高力ボルト接合による外ダイアフラム形式柱梁接合部における角形鋼管の局部変形挙動

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積層した炭素繊維シートのVaRTM 成形・接着による面外ガセット溶接継手の疲労耐久性の向上

タイ ウィサル, 小沢 拓弥, 譚 暢, 中村 一史, 松井 孝洋

pp. 105_29-105_42

DOI:

10.11273/jssc.27.105_29

抄録

This paper deals with the fatigue durability of typical welded gusset joints in steel bridges strengthened by externally bonded carbon fiber (CF) sheets using Vacuum assisted Resin Transfer Molding (VaRTM) technique. The target specimens of welded gusset plates were fabricated and subjected to cyclic load. The fatigue tests of two types of specimens, non-strengthened and strengthened specimen with CF sheets using VaRTM technique, have been conducted in the parameter of nominal stress ranges and strengthened effects have been evaluated under applied stress ranges. The result shows that the fatigue durability of welded gusset joints strengthened by CF sheets using VaRTM technique can be remarkably improved.

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積層した炭素繊維シートのVaRTM 成形・接着による面外ガセット溶接継手の疲労耐久性の向上

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ガセット取付部疲労亀裂の点検管理基準の提案

小西 拓洋, 横山 薫, 関屋 英彦, 平野 秀一, 三木 千壽

pp. 105_43-105_52

DOI:

10.11273/jssc.27.105_43

抄録

Fatigue cracks in the web gusset round weld are regarded as important targets in bridge inspection. In order to avoid the risk of fracture certainly, it is necessary to understand the propagation behavior of the crack, critical crack size and detection methods. For these purposes, fatigue loading test using a large-size girder specimen with same gusset details as actual bridge was carried out to clarify the crack propagation by introducing beach marks. At the same time, several crack detection methods were applied during the fatigue test to find their detection ability with respect to the crack size. Based on those results, the control limit size for the crack inspection is proposed.

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ガセット取付部疲労亀裂の点検管理基準の提案

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大変形弾性部材をブレースとして組み込んだ鋼構造骨組の地震応答

岸添 将至, 澤田 樹一郎

pp. 105_53-105_60

DOI:

10.11273/jssc.27.105_53

抄録

This paper presents seismic responses of steel frames with large deformable elastic braces by means of time domain analyses. Large deformable elastic braces are braces which never yield under even major earthquakes. The braces can realize large deformable elastic capability by unique topologies cut from steel plates. Seismic responses are compared and discussed for various steel frames with and without large deformable elastic braces.

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大変形弾性部材をブレースとして組み込んだ鋼構造骨組の地震応答

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コンクリート充填角形鋼管柱の降伏耐力評価式

藤岡 大二郎, 城戸 將江, 崔 剛

pp. 105_61-105_76

DOI:

10.11273/jssc.27.105_61

抄録

The purpose of this study is to propose a method to evaluate yield strength of square CFT columns. Yield strength of a CFT column is calculated by assuming the stress-strain relationships of concrete and steel tube and using the Navier's hypothesis. Yield strength is compared with the superposed strength of square CFT short columns. Yield strength can be classified by four types of m-n interaction curves depending on the strain condition of the section. The formula for calculating yield strength is proposed by straight lines for each type. We show the difference between the simplified strength and yield strength and the method for determining the type and a calculation example.

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コンクリート充填角形鋼管柱の降伏耐力評価式

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鋼床版SFRC 舗装の接合に使用するエポキシ系接着剤の環境負荷後の材料特性に関する実験的検討

松本 稔将, 村越 潤, 堀井 久一, 小野 秀一

pp. 105_77-105_88

DOI:

10.11273/jssc.27.105_77

抄録

As an effective countermeasure to prevent fatigue cracks at existing orthotropic steel deck (OSD) bridges, steel fiber reinforced concrete (SFRC) overlays have been increasingly used for damaged OSDs. SFRC has been adhesively bonded to deck plate by epoxy adhesives. A series of tensile shear and compressive tests of specimens using several epoxy adhesives immersed in water with high temperatures were conducted in order to examine the environmental degradation of the adhesive joints. Based on the experiments, this paper describes degradation tendency of the strength of the adhesively bonded joints and the material properties.

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鋼床版SFRC 舗装の接合に使用するエポキシ系接着剤の環境負荷後の材料特性に関する実験的検討

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炭素繊維シートが積層接着された十字溶接継手止端部の応力集中係数の推定

小沢 拓弥, タイ ウィサル, 中村 一史, 松井 孝洋

pp. 105_89-105_98

DOI:

10.11273/jssc.27.105_89

抄録

The purpose of this study is to suggest estimated formula of stress concentration factor on weld toe of non-load-carrying cruciform welded joints by externally bonded CF sheets. The regression lines of the relationship between numbers of CF sheet layers and stress reduction factor was analytically investigated using finite element (FE) model varying the toe radius. Further, estimated formula of stress concentration factor has been proposed by combined with the estimated formula of the stress concentration coefficient at the weld toe. The verification of the proposed estimated formula was carried out by comparing the stress concentration factor by tensile test and FE model simulating the weld toe of specimen.

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炭素繊維シートが積層接着された十字溶接継手止端部の応力集中係数の推定

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道路橋鋼コンクリート合成床版のずれ止めに作用する水平せん断力に関する解析的検討

東山 浩士, 大久保 宣人, 春日井 俊博, 久保 圭吾

pp. 105_99-105_104

DOI:

10.11273/jssc.27.105_99

抄録

Horizontal shear force acting on shear connectors in steel-concrete composite bridge decks has been basically designed by using Design Code for Steel Structures PART B so far. However, Specifications for Highway Bridges were revised in 2017 and the design load condition became different between them. In this study, shear force was analyzed by using elastic FE programs when T-type loads specified in the Specifications for Highway Bridges were applied on steel-concrete composite bridge decks. From the analytical results, the maximum shear force was presented at each loading position. Furthermore, from case studies, sharing ratio of the horizontal shear force acting on headed stud connectors was determined.

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道路橋鋼コンクリート合成床版のずれ止めに作用する水平せん断力に関する解析的検討

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