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鋼構造論文集 Vol. 7 (2000), No. 26

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. 7 (2000), No. 26

橋梁における超音波自動探傷装置の開発

土屋 憲一郎, 川畑 篤敬

pp. 1-12

DOI:

10.11273/jssc1994.7.26_1

抄録

Japan, the X-ray Test method has been applied for many years in the examination of welding. However, the Ultrasonic Test is more suitable for the welding of thick plate over 50mm. To increase the reliability of the Ultrasonic Test, it is necessary to improve the method of recording and also to improve the reproducibility of the result for examination. This paper will describe the newly developed Ultrasonic Test equipment which is capable of recording all of the examined data automatically. In addition, the paper will deal with the results of studies carried out to examine the accuracy of the equipment. In conclusion, the newly developed equipment displays high performance in the areas of speed, accuracy and reproducibility. Furthermore, the performance of the equipment to judge a welding defect can be confirmed by combination with the TRFD method.

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橋梁における超音波自動探傷装置の開発

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建築構造用マグ溶接ワイヤの検討

向井 昭義, 中野 利彦, 岡本 晴仁, 森田 耕次

pp. 13-25

DOI:

10.11273/jssc1994.7.26_13

抄録

The objective of this investigation was to research the effects of type of MAG welding wire, heat input, and interpass temperature on the mechanical properties of weld metals, intending to use for the column-to-beam joints. The most suitable type of wire for the joints was a 540N/mm2-class wire featuring higher strength and toughness when compared with conventional 490N/mm2-class wires. Proper ranges of heat input and interpass temperature for 400N/mm2- and 490N/mm2-class steels were also found.

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建築構造用マグ溶接ワイヤの検討

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平板溶接構造部材のホットスポット応力算定法に関する検討

征矢 勇夫

pp. 27-34

DOI:

10.11273/jssc1994.7.26_27

抄録

A hot spot stress (HSS) concept is expected to be widely used in a fatigue assessment of welded steel structures. In order to establish a HSSdefinition and fatigue design procedure, finite element analyses were conducted on a plate model with a welded gusset. Then, various HSS calculation methods were examined. As a result, it was revealed that existing calculation methods such as two-point method and one-point method bring relatively large errors hen plate thickness becomes large. Considering the width of local stress oncentration, a new two-point method has been proposed in this paper. Furthermore, the fatigue strength grades in the existing fatigue design recommendations were compared with the HSS values.

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平板溶接構造部材のホットスポット応力算定法に関する検討

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ケーブルと束材で補剛された単層ラチスドームの耐震性能に関する一考察

立道 郁生, 加藤 史郎, 中澤 祥二, 嶺岸 孝志, 安間 由倫

pp. 35-42

DOI:

10.11273/jssc1994.7.26_35

抄録

The purpose of this paper is to study on a earthquake resistant of singlelayer latticed domes stiffened with cables and struts. The roof frame is a 100-m span. A proportioning method for member sections based on second-order elastic analysis is used. And dynamic analysis are calculated by elastic linear on upper structure, and elastoplastic on lower structure time-domain analysis adopting one acceleration records of El centro-S.

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ケーブルと束材で補剛された単層ラチスドームの耐震性能に関する一考察

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曲面部分を有する圧縮板の終局強度とその評価法に関する研究

坂口 三代治, 北田 俊行, 中井 博, 徳林 宗孝, 狩野 正人

pp. 43-49

DOI:

10.11273/jssc1994.7.26_43

抄録

Thos study deals with the ultimate strength and method for evaluating that of steel compression plates with a rounded part through the elasto-plastic and finite displacement analysis based on a finite element method. In this analysis, the residual stness distnbution idealized on the basis of the data measured in a steel stiffened stub column with rounded corners is considered . Main parameters of the analysis are the modes of initial deflection, radius-to-thickness ratio of a rounded part and breadth of flat parts . Finally, from the results of the analysis, the method for evaluating the ultimate strength and the appropriate location of longitudinal stiffeners for the stiffened stub columns with rounded corners are proposed

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曲面部分を有する圧縮板の終局強度とその評価法に関する研究

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角形鋼管柱に接合される梁ウェブ接合部の曲げ耐力

吹田 啓一郎, 田中 剛

pp. 51-58

DOI:

10.11273/jssc1994.7.26_51

抄録

This paper presents a method of evaluating the flexural strength of a beam web joint connected to a square tube column, considering the out-of-plane deformation of the column flange. The ultimate flexural strength is obtained by applying the yield line theory to a combination of the collapse mechanisms of the column flange and the beam web end. A simple design formula is lead from the obtained solution, and its accuracy required for the practical design is confirmed by the results of both loading tests and numerical analyses. The design formula evaluating the yield strength of the beam end connection is also indicated and its validity is verified.

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角形鋼管柱に接合される梁ウェブ接合部の曲げ耐力

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ノンダイアフラム形式箱形断面柱一H形断面梁接合部の弾塑性挙動の評価

原田 幸博, 森田 耕次, 横井 圭司, 藤田 謙一

pp. 59-72

DOI:

10.11273/jssc1994.7.26_59

抄録

The purpose of the present paper is to show how to estimate an elastic-plastic behavior of to-RHS column connection without diaphragm. The elastic-plastic behavior o such connection is regarded as not rigid, but semi-rigid, because out-of-plane deformation in column flange cannot be neglected; the behavior of the connection is analytically model as non-linear rotational spring at beam-ends. In this paper, properties of the rotational spring, tangent s ' ess and maximum strength, are determined by numerical analysis based on yield line theory d finite element analysis, and estimating equations for the properties are proposed. The connection with horizontal haunch at beam flange and the one partially thickened at column flange are also considered.

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ノンダイアフラム形式箱形断面柱一H形断面梁接合部の弾塑性挙動の評価

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高力ボルト接合された山形鋼引張り筋違い材の破断形式と破断耐力

宇田川 邦明, 山田 隆夫, 吉野 雅之

pp. 73-81

DOI:

10.11273/jssc1994.7.26_73

抄録

In low-rise steel structures, tension angles are widely adopted for earthquake resistance. Failures of the tension angles at joints with high-strength bolts have three modes: net section fracture, end fracture, and outer tearing fracture. In the current design method, the ultimate strength of the joints is supposed to be examined only for the net section fractures and the end fractures. But, the design values obtained by this method are not always accurate for edge distances and arrangements of bolt holes. Furthermore, as the outer tearing fractures actually occur in tension angles, in addition to these other two fracture types, we need to make a design formula for the outer tearing fracture. In this research program, we examine experimentally the effects of the bolt-hole arrangement and edge distance of the bolted joints on the ultimate strength of the tension angles and the failure modes. We propose formulas to predict the ultimate strength of joints for the net section and the outer tearing failure modes.

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高力ボルト接合された山形鋼引張り筋違い材の破断形式と破断耐力

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