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Kou kouzou rombunshuu Vol. 21 (2013), No. 81

ISIJ International
belloff
ONLINE ISSN: 1884-0329
PRINT ISSN: 1880-9928
Publisher: Japanese Society of Steel Construction

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Kou kouzou rombunshuu Vol. 21 (2013), No. 81

RATIONALIZED DESIGN OF INTERMEDIATE DIAPHRAGM IN STEEL BOX GIRDER BRIDGES

Kenta TANAKA, Syuuhei SAKAI, Dai WAKABAYASHI, Masatsugu NAGAI

pp. 81_1-81_12

DOI:

10.11273/jssc.21.81_1

Abstract

The space and rigidity of the intermediate diaphragms have been designed based on the design handbook issued from Japan Road Association, in which the large rigidity is precondition, or by computer calculation using BEF analogy model. The former sometimes gives large or impractical rigidity, while the latter method gives much freedom of design, because arbitrary space and rigidity can be chosen and the distortional stress is also calculated. In this paper, aiming at rationalization of the design, the method based on BEF analogy model is proposed, in which the accuracy the distortional stress by analogy calculation is compared with that by FEA and also the economical advantage of using this method is presented.

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RATIONALIZED DESIGN OF INTERMEDIATE DIAPHRAGM IN STEEL BOX GIRDER BRIDGES

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Reinforcement design of existing non-conformed steel buildings using STKR columns (Reinforcement with steel plates and steel angles)

Tatsuya NAKANO, Takashi HASEGAWA, Kengo NAGAMINE

pp. 81_13-81_26

DOI:

10.11273/jssc.21.81_13

Abstract

In 2007, the building standard law of Japan was revised and a specification of column overdesign factor (COF) was added in case of square tube columns. Our researches deal with existing non-conformed steel buildings using STKR columns according to being not satisfied with the specification of COF. In this paper, in order to enhance the full-plastic moment of column, reinforcement with steel plates and steel angles are proposed. An experimental verification of reinforced columns was conducted to investigate elasto-plastic behavior and confirm the validity of reinforcement design method. As a result, specifications for providing required bending moment to STKR columns were clarified.

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Reinforcement design of existing non-conformed steel buildings using STKR columns (Reinforcement with steel plates and steel angles)

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FLEXURAL BUCKLING STRENGTH OF H-SHAPED SECTION BRACING REINFORCED BY WELDING ADDITIONAL PLATES OVER MIDDLE PORTION

Shizuo TSUJIOKA, Yasuyuki NAGANO, Susumu KUWAHARA

pp. 81_27-81_33

DOI:

10.11273/jssc.21.81_27

Abstract

In the case of H-shaped section bracing, the flexural buckling strength can be improved by increasing the cross section over the middle portion. For example, the increase in sections is accomplished by welding additional plates. The compression tests in inelastic ranges were conducted on the pin-ended columns reinforced H-shaped section by welding plates. The buckling behavior and the mode are examined for the members having a variety of proportion. It is found that the corresponding buckling strength can be larger than the column curve of the design standard for steel structures.

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FLEXURAL BUCKLING STRENGTH OF H-SHAPED SECTION BRACING REINFORCED BY WELDING ADDITIONAL PLATES OVER MIDDLE PORTION

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A STUDY ON TENSILE STRENGTH OF TRANSVERSE BUTT-WELDED JOINTS WITH UNDER-MACHED WELD MATERIALS

Mitsuru ICHIMIYA, Takeshi MORI, Shogo IKEDA

pp. 81_35-81_45

DOI:

10.11273/jssc.21.81_35

Abstract

Use of high-strength steel is one of the factors for rationalizing designs of steel bridges. However, high-strength steel can incur problems with weldability, such as the occurrence of weld cracks. One approach to mitigating such problems is to employ under-matched welded joints; however, the tensile strength of transverse butt-welded joints is uncertain. In this study, tensile tests and elasto-plastic analyses were performed on these joints made of three types of steel with different tensile strengths and soft weld metals. On the basis of the experimental and analytical results, we propose an expression for obtaining tensile strengths of transverse butt-welded joints.

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A STUDY ON TENSILE STRENGTH OF TRANSVERSE BUTT-WELDED JOINTS WITH UNDER-MACHED WELD MATERIALS

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FATIGUE STRENGTH OF OVERLAP JOINT WITH TRANSVERSE FILLET WELD SUBJECTED TO OUT-OF-PLANE BENDING

Kazuo TATEISHI, SungMin CHOI, Takeshi HANJI, Daisuke UCHIDA, Koichi ASANO, Kiyoshi KOBAYASHI

pp. 81_47-81_53

DOI:

10.11273/jssc.21.81_47

Abstract

Fatigue strength of overlap welded joints in which transverse fillet welds were provided was investigated under an out-of-plane bending condition. Fatigue test results demonstrated the joints were failed by weld toe cracks, and the fatigue strength was equal to that of non-load carrying cruciform joints. When intermittent fillet welds were provided, the fatigue strength was reduced, but it was properly evaluated by using the hot spot stress approach.

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FATIGUE STRENGTH OF OVERLAP JOINT WITH TRANSVERSE FILLET WELD SUBJECTED TO OUT-OF-PLANE BENDING

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STRENGTH ESTIMATION METHOD OF OFFSET BEAM-TO-COLUMN CONNECTION PANELS WITH EXTERIOR DIAPHRAGMS CONSIDERING THE EFFECT OF AXIAL FORCE RATIO

Ben MOU, Shintaro MATSUO, Ryusuke IKEDA, Akihiko KAWANO

pp. 81_55-81_64

DOI:

10.11273/jssc.21.81_55

Abstract

The behavior of offset beam-to-column connection panels with exterior diaphragms under axial load is examined by using finite element analysis in this paper. In the analysis, seven cruciform subassemblages tested in the previous study are simulated and the models are validated by comparing numerical results with experimental data. Parameters used in this analytical study are width-to-thickness ratio, applied axial load on the column, difference between beam depths at both sides of the connection panel and the collapse mechanisms of connections. Accuracy of the proposed strength calculation formulae are investigated and collapse mechanisms of the connection are identified. Major findings are as follows: 1) the assumed collapse mechanisms coincide with the experimental results; 2) Stiffness and strength of the connection panels can be properly evaluated by the proposed formulae with the axial force ratio equal to or less than 0.5.

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STRENGTH ESTIMATION METHOD OF OFFSET BEAM-TO-COLUMN CONNECTION PANELS WITH EXTERIOR DIAPHRAGMS CONSIDERING THE EFFECT OF AXIAL FORCE RATIO

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EFFECT OF INSIDE FILLET WELD ON FATIGUE DURABILITY OF ORTHOTROPIC STEEL DECK WITH TROUGH RIBS

Masahiro SAKANO, Naoto NISHIDA, Akiko TABATA, Hiroki SUGIYAMA, Manabu OKUMURA, Yoshihiro NATSUAKI

pp. 81_65-81_77

DOI:

10.11273/jssc.21.81_65

Abstract

In this study, through fatigue tests of specimens with outside or both side fillet welds joints between deck plate and trough ribs, the effect of inside fillet weld was investigated on fatigue durability of orthotropic steel deck with trough ribs by comparing the fatigue behaviour of outside fillet welded joints and both side fillet welded joints. As a result, in both side fillet welded joints, fatigue cracks were initiated at the toe and root of inside fillet welds, and propagated into the deck plate. The inside fillet welds had little effect on fatigue durability of fillet welded joint between deck plate and trough rib.

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EFFECT OF INSIDE FILLET WELD ON FATIGUE DURABILITY OF ORTHOTROPIC STEEL DECK WITH TROUGH RIBS

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THE RUST EVALUATION AND CORROSION LOSS CHARACTERISTICS OF WEATHERING STEEL BRIDGES EXPOSED FOR ABOUT 30 YEARS

Tetsuhiro SHIMOZATO, Hiroyuki HONDA, Yasunori ARIZUMI, Hideaki FUCHIWAKI

pp. 81_79-81_87

DOI:

10.11273/jssc.21.81_79

Abstract

This paper studied the weathering steel bridge that has exposed 30 years in air environment at the location different river and urban areas. Corrosive environment survey, rust survey and exposure test using attachable small test pieces were investigated. Rust evaluation of weathering steel bridges were carried out. In exposure test, amount of long-term corrosion loss that was estimated by exposure test using attachable small test pieces of one year and multi-year were compared.

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THE RUST EVALUATION AND CORROSION LOSS CHARACTERISTICS OF WEATHERING STEEL BRIDGES EXPOSED FOR ABOUT 30 YEARS

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Main Cable Inspection of Matadi Bridge in Democratic Republic of Congo

Tsuyoshi Matsumoto, Masaaki Tatsumi, Katsuya Ogihara, Yutaro Kaneko

pp. 81_89-81_99

DOI:

10.11273/jssc.21.81_89

Abstract

The Matadi Bridge, a suspension bridge in Democratic Republic of Congo, was completed in May 1983 by the Japanese ODA. For the main cables of this bridge, the wrapping paste and the wrapping wire combination against the corrosion was adopted. In Japan, this combination was found out to be inadequate, and a dry air injection system was introduced. Therefore it was feared that the corrosion of this cable might be found. To examine the present condition, the main cables were unwrapped and investigated at the site. Some corrosion was found as expected. This paper reports this inspection.

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Main Cable Inspection of Matadi Bridge in Democratic Republic of Congo

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