Kou kouzou rombunshuu
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ONLINE ISSN: 1884-0329
PRINT ISSN: 1880-9928

Kou kouzou rombunshuu Vol. 13 (2006), No. 50

  • Elastic-Plastic Behaviour of RHS Column-to-H Beam Connection with Split-T Tension Type High Strength Bolted Connections

    pp. 1-16

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    DOI:10.11273/jssc1994.13.50_1

    The purpose of the present study is to develop analytical model for RHS column-to-H beam connection with split-T tension type high strength bolted connections. The analytical model proposed in this study cosists of two elastic-plastic uni-axial springs at beam ends. The mechanical properties of the elasticplastic spring governing elastic-plastic behaviour of the connection, such as yield and ultimate strengths and initial stiffness, are determined according to several previous experimental and analytical studies. In order to investigate how the connection strength depends on axial load of the column member, the elastic-plastic behaviour of the connection is also analyzed by finite element method (FEM); the analytical yield strength is applicable if an axial compression ratio is lower than 0.5, the analytical ultimate one is applicable if the axial compression ratio is lower than 0.3.
  • Study on Designs to Prevent Fracture in Beam-to-Welded Box Column Connection Part2 Plastic Analysis of the Beam-End Connection

    pp. 17-26

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    DOI:10.11273/jssc1994.13.50_17

    To establish a design to prevent brittle fracture in H-beam-to-welded box column connection, the stress in vicinity of joints was investigated by finite analysis in Part 1. Its results show that the plastic deformation introduced into interior diaphragm is widely expanded. Then, to estimate the local plastic strength of the beam-to-welded box column connection considering the plastic deformation of interior diaphragm by the yield line theory is proposed.
  • Improvement of Extremely Low Cycle Fatigue Strength of Welded Joints by TIG Dressing

    pp. 27-34

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    DOI:10.11273/jssc1994.13.50_27

    In order to prevent the low cycle fatigue damage in existing steel bridge members as observed in the Hanshin-Awaji Great Earthquake in 1995, improving the fatigue strength of welded joints can be a realistic option. In this study, the effect of TIG dressing, which is one of the ways to finish the weld toe, was investigated. As a specimen, T-shape welded joint specimens were employed. Some specimens were finished with TIG dressing, and the others were left as welded. The low cycle fatigue tests were conducted for these specimens in the same conditions. The test results indicated that TIG dressing made the low cycle fatigue life of welded joints much longer.
  • Monitoring of Initiation and Propagation of Fatigue Crack by Field Signature Method

    pp. 35-43

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    DOI:10.11273/jssc1994.13.50_35

    Considering Field Signature Method (called as FSM hereinafter) to apply for monitoring initiation and propagation of fatigue crack under load, the applicability of FSM was investigated by a series of experiments. Initiation of fatigue crack under 1(mm) at the toe of welds could be detected by FSM. Moreover, propagation of the very small fatigue crack in the bridge member could be detected under the repeated loads. It was found that initiation and propagation of fatigue crack in the bridge member could be accurately monitored under live loads by FSM.
  • Full Scale Test on the Transition from Ductile Fracture to Brittle Fracture of Beam-to-Column Connections

    pp. 45-56

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    DOI:10.11273/jssc1994.13.50_45

    In the Hyougoken-Nanbu Earthquake (1995), the fractural modes of failures were predomination in the damage of steel buildings. In the paper, the transition of fractural modes of steel structural elements from brittle fracture to a ductile fracture was discussed. For building material of steel, the tensile tests and Charpy-impact tests were executed in various temperatures. Finally, full-scale tests of the beam-to-column connection as a representative of structural elements were carried out in three conditions of temperature. Using the nil ductility temperature, an evaluation of failure modes on steel buildings was tried.
  • Effects of Beam Flange Width-to-Thickness Ratio on Beam Flange Fracture

    pp. 57-72

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    DOI:10.11273/jssc1994.13.50_57

    In steel building structures, the plastic rotation capacity of H-shaped beam welded to the column is affected by failure mode. When width-to-thickness ratio of beam flange (bit) is large, local buckling of the beam flange governs the rotation capacity of the beam. On the other hand, when stocky beam section is used, fracture of the beam flange or weld at the stress concentra tion point of the beam end may occur. In this case, premature fracture of the beam flange or weld may occur before the local buckling of the beam flange, when the ductility and the toughness of the beam flange material is poor. In this study, two series of tests were carried out to investigate the boundary between the local buckling and the fracture of the beam flange.
  • Development of Stud-Type Damper Composed by visco-elastic material and Two Steel Columns, and Full-Scale Loading Test

    pp. 73-82

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    DOI:10.11273/jssc1994.13.50_73

    This paper presents the development of stud-type damper composed by visco-elastic material and two steel columns. The advantages of the damper are as follows. (1) Since visco-elastic material is used, a high damping effect is expected even if the amplitude at the time of vibration is small. (2) Stud-type gives high flexibility to floor planning. This damper and beam are connected by means of split-T and high-strength blots. The results of the full-scale loading tests revealed the stable hysteretic behavior and energy dissipation capacity of the damper as well as the validity of the strength values and the energy dissipation capacity estimated from the assumption that two steel columns are rigid.
  • Experimental Study on Member-Axial Stress-Strain Relationship of Concrete-Filled Steel Members Subjected to Compression, Bending and Torsion

    pp. 83-93

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    DOI:10.11273/jssc1994.13.50_83

    It is important to investigate the structural behavior of concrete-filled steel members with transverse constraint up to and in the vicinity of the ultimate state for evaluating the strength and ductility of these members. For this purpose, the structural behavior and the ultimate strength and ductility of both concrete-filled steel box members subjected to compression and bending and concrete-filled steel box and circular members subject to torsion are investigated experimentally. The influence of the lateral constraint on the constitutive behavior of encased concrete and on the strength and ductility of the concrete-filled members with transverse constraint is verified.
  • Relationship between Mechanical properties and Chemical compositions in steel for bridges (Part.2 :Relationship between Charpy absorbed energy and Chemical compositions)

    pp. 95-104

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    DOI:10.11273/jssc1994.13.50_95

    In the past, we had investigated the number of 1412 steel on the basis of the mill sheet in order to clarify these steel quality, and these steel of mechanical properties, impact property and chemical compositions had been shown[1][2]. We also had discussed the relationship between mechanical properties(tensile strength, yield strength) and chemical compositions[3]. However, in these papers, the relationship between impact property and chemical compositions had not been discussed. In this paper, we investigated the relationship between impact property(Charpy absorbed energy) and chemical compositions(Carbon, Silicon, Manganese, Phosphorus and Sulfur) including PcM(Cracking Parameter of Material) and Ceq(Carbon equivalent), and these results were shown.

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