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

Kou kouzou rombunshuu Vol. 19 (2012), No. 75

  • PERFORMANCE OF STEEL PIPE PILES REPAIRED BY PATCH WELDING CONSIDERING THE EXISTING AXIAL LOADS

    pp. 75_1-75_12

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    DOI:10.11273/jssc.19.75_1

    Patch welding is a common method to repair corrosion-damaged steel structures. This paper investigates the performance of steel pipe piles repaired by patch welding considering the effect of the existing axial compressive loads. The performance of pipe piles is evaluated by a set of finite element (FE) analysis, and the mechanism of load transfer in the repaired pipe piles is examined. A minimum patch thickness to recover the initial stiffness and the strength of the corrosion-damaged pipe piles is proposed. Some practical issues in the welding repair design are also discussed.
  • 780N/mm2 Grade Steel with a Decrement of Yield Ratio Produced through Heat-treatment On-line Process and its Local buckling Performance as a Structural member

    pp. 75_13-75_25

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    DOI:10.11273/jssc.19.75_13

    780N/mm2 Grade strength steel plates designed for earthquake-proof buildings have been developed. They provide high strength, low yield ratio, weldability and excellent toughness in welded joints. Key technology to obtain an excellent combination of mechanical properties is microstructural control of M-A (Martensite-Austenite constituent) and granular bainitic ferrite dual-phase structure through HOP (Heat-treatment On-line Process) immediately after an accelerated cooling in TMCP(Thermo-Mechanical Control Process). The developed steel plates have shown satisfactory performance for local buckling.
  • PLASTIC DEFORMATION CAPACITY AND FRACTURE PREVENT DESIGN OF MOMENT CONNECTION STRENGTHENED BY THICK FLANGE

    pp. 75_27-75_39

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    DOI:10.11273/jssc.19.75_27

    This paper presents the results of full-scale loading tests of beam-to-column subassmblages strengthened by TF (Thick-Flange) connection. TF connection is a moment frame connection with the thickness of the beam flange increased near the connection region to prevent fracture of the welded moment connection and effective to improve workability and quality of the welding. From test results, TF connection successfully avoid fracture initiated from welds and exhibited sufficient deformation capacity. The design method of the tapered thick flange is proposed to prevent a crack at the toe of the weld access hole and to keep the plastic region of the beam away form the welds.
  • A Design Method on Temperature Girder Deformations and Estimation Method of Seismic Maximum Displacement of Steel Bellows as Energy Absorbing Seismic Control Devices

    pp. 75_41-75_53

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    DOI:10.11273/jssc.19.75_41

    This paper proposes a design method of steel bellows as seismic control devices for girder bridges on temperature girder deformations. Steel bellows are connected between girders and abutments in order to reduce the damage of superstructures and substructures. Local plastic strains of bellows are permitted due to temperature expansion and contraction of girders considering fatigue strength. This paper also proposes an estimation method of seismic maximum displacement of steel bellows using nonlinear response spectrum. The size of bellows can be designed based on the proposed methods and the maximum displacements are estimated using nonlinear response spectrum. The estimated values are compared with calculated values by FEM and the estimated values agree fairly well with those of the non-linear time history analyses.
  • STUDY ON EFFECT OF DECK THICKNESS OF ORTHOTROPIC STEEL DECK ON FATIGUE DURABILITY

    pp. 75_55-75_65

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    DOI:10.11273/jssc.19.75_55

    In this paper, effect of thickness of deck plate on fatigue durability of orthotropic steel deck is discussed with wheel running tests. Test specimen of this research has combinations of 16/19mm thickness deck plates and 6/8mm thickness U-shaped ribs. Wheel running tests with 4 million times loading were conducted on each part of the deck. Finite element analyses were also conducted in order to clarify effect of thickness of deck plate on local stress at weld joints connecting deck plate and U-shaped rib. It was clarified that local stresses at weld root become smaller and the crack propagation tends to slow with increase of deck plate.
  • Investigation of Steel Mechanical Properties on 3% Ni-advanced weathering steel

    pp. 75_67-75_77

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    DOI:10.11273/jssc.19.75_67

    Recently, many kinds of weathering steel were widely used in steel bridges. 1% and 3% Ni-advanced weathering steel are new types of weathering steel. It was considered that the quality of these steel have been remarkably improved. However, such improvement had not been quantitatively clarified. Therefore, in the past, we had investigated 753 of 1% Ni-advanced weathering steel on the basis of the mill sheet in order to clarify their quality, and these steel mechanical properties had been shown. In this paper, we investigated the 764 of 3% Ni-advanced weathering steel on the basis of the mill sheet. Investigated items were tensile strength, yield strength, charpy-absorbed-energy, elongation and yield ratio. We also discussed how much of these quantities were improved, comparing with the conventional weathering steel data.

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