Kou kouzou rombunshuu
New Arrival Alert : OFF

You can use this feature after you logged into the site.
Please click the button below.

Log in / Sign up
ONLINE ISSN: 1884-0329
PRINT ISSN: 1880-9928

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

  • RATIONALIZED DESIGN OF INTERMEDIATE DIAPHRAGM IN STEEL BOX GIRDER BRIDGES

    pp. 81_1-81_12

    Bookmark

    You can use this feature after you logged into the site.
    Please click the button below.

    Log in / Sign Up

    DOI:10.11273/jssc.21.81_1

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

    pp. 81_13-81_26

    Bookmark

    You can use this feature after you logged into the site.
    Please click the button below.

    Log in / Sign Up

    DOI:10.11273/jssc.21.81_13

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

    pp. 81_27-81_33

    Bookmark

    You can use this feature after you logged into the site.
    Please click the button below.

    Log in / Sign Up

    DOI:10.11273/jssc.21.81_27

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

    pp. 81_35-81_45

    Bookmark

    You can use this feature after you logged into the site.
    Please click the button below.

    Log in / Sign Up

    DOI:10.11273/jssc.21.81_35

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

    pp. 81_47-81_53

    Bookmark

    You can use this feature after you logged into the site.
    Please click the button below.

    Log in / Sign Up

    DOI:10.11273/jssc.21.81_47

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

    pp. 81_55-81_64

    Bookmark

    You can use this feature after you logged into the site.
    Please click the button below.

    Log in / Sign Up

    DOI:10.11273/jssc.21.81_55

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

    pp. 81_65-81_77

    Bookmark

    You can use this feature after you logged into the site.
    Please click the button below.

    Log in / Sign Up

    DOI:10.11273/jssc.21.81_65

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

    pp. 81_79-81_87

    Bookmark

    You can use this feature after you logged into the site.
    Please click the button below.

    Log in / Sign Up

    DOI:10.11273/jssc.21.81_79

    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.
  • Main Cable Inspection of Matadi Bridge in Democratic Republic of Congo

    pp. 81_89-81_99

    Bookmark

    You can use this feature after you logged into the site.
    Please click the button below.

    Log in / Sign Up

    DOI:10.11273/jssc.21.81_89

    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.

Article Access Ranking

15 Nov. (Last 30 Days)

  1. Quantitative Evaluation of Reaction Mode and Reduction Disintegration Behavior of Iron Ore Agglomerates during Low Temperature Reduction ISIJ International Vol.58(2018), No.10
  2. Mechanical Property of Ultrafine Elongated Grain Structure Steel Processed by Warm Tempforming and Its Application to Ultra-High-Strength Bolt Tetsu-to-Hagané Advance Publication
  3. Off-line Model of Blast Furnace Liquid Levels ISIJ International Advance Publication
  4. Fusion Zone Microstructural Evolution of Al-10% Si Coated Hot Stamping Steel during Laser Welding ISIJ International Advance Publication
  5. Mathematical Modelling of the Effects of Transient Phenomena on Steel Cleanness during Tundish Transfer Practices ISIJ International Advance Publication
  6. Phase Transformation of Cohesive Zone in a Water-quenched Blast Furnace ISIJ International Vol.58(2018), No.10
  7. Preparation of High-Carbon Metallic Briquette for Blast Furnace Application ISIJ International Advance Publication
  8. Phase Transformation Behavior of Oxide Scale on Plain Carbon Steel Containing 0.4 wt.% Cr during Continuous Cooling ISIJ International Advance Publication
  9. Nanocluster Control for Achieving High Strength Aluminum Alloys MATERIALS TRANSACTIONS Vol.59(2018), No.6
  10. Effect of Annealing Time on Oxides Phases and Morphology along Oxidized Depth of Fe-3%Si Steel during Decarburization ISIJ International Advance Publication

Search Phrase Ranking

15 Nov. (Last 30 Days)

  1. blast furnace
  2. blast furnace productivity
  3. blast furnace permeability
  4. automation in steel industry
  5. selective oxidation
  6. automation in steel plant
  7. hot ductility of steels and its relationship to the problem of transverse cracking during continuous casting
  8. isij international
  9. stainless steel
  10. bof lime injection top lance