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Kou kouzou rombunshuu Vol. 31 (2024), No. 122

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

Backnumber

  1. Vol. 32 (2025)

    1. No.125

  2. Vol. 31 (2024)

    1. No.124
    2. No.123
    3. No.122
    4. No.121

  3. Vol. 30 (2023)

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    4. No.117

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  31. Vol. 2 (1995)

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  32. Vol. 1 (1994)

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    2. No.3
    3. No.2
    4. No.1

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18 May. (Last 30 Days)

Kou kouzou rombunshuu Vol. 31 (2024), No. 122

APPLICATION OF HARDNESS TEST FOR ESTIMATING MECHANICAL PROPERTIES OF STEELS FOR BRIDGE HIGH PERFORMANCE STRUCTURE SUBJECTED TO HEATING AND COOLING

Koki MATSUBARA, Mikihito HIROHATA, Ayato HAMADA

pp. 122_1-122_15

DOI:

10.11273/jssc.31.122_1

Abstract

A series of investigations were conducted to clarify the change in mechanical properties of SBHS subjected to heating and cooling assuming fire, and to examine whether the change can be estimated by hardness tests. When SBHS was heated above 600 ℃ and then cooled, the material strength decreased due to recrystallization and transformation. A clear correspondence was observed between the mechanical properties of SBHS subjected to heating and cooling and the Leeb and Vickers hardnesses. The yield stress and tensile strength could be estimated by the hardness tests with an error of approximately 5 % from the tensile test results.

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APPLICATION OF HARDNESS TEST FOR ESTIMATING MECHANICAL PROPERTIES OF STEELS FOR BRIDGE HIGH PERFORMANCE STRUCTURE SUBJECTED TO HEATING AND COOLING

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Ris

Relationship between welding conditions and mechanical properties of column-end joint by welding robot for cold press formed steel tube

Haruhiko NAKAGAWA, Tatsuya NAKANO, Hayato ASADA, Shigeto TAKADA, Yasunori NAGAKU, Jun NISHIZAWA, Manabu MIZUMOTO, Kyohei YASUDA

pp. 122_16-122_28

DOI:

10.11273/jssc.31.122_16

Abstract

In this study, the mechanical properties of the weld metal applied to the joints between the cold press formed steel tube and the through diaphragm were investigated by the welding test and the heat conduction analysis. The parameters of the welding test were the welding conditions such as the heat input, the type and shape of weld joint. The characteristic point was that the maximum heat input was set to 60 kJ/cm which was the upper limit for the welding robot as opposed to normal 30 kJ/cm. From the test and analysis results, it was clarified that the welding conditions affected the inter-pass temperature and the cooling time of weld metal. There was a correlation that the strength of weld metal increased with the increase the cooling speed.

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Relationship between welding conditions and mechanical properties of column-end joint by welding robot for cold press formed steel tube

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ELEMENT TENSILE LOADING EXPERIMENT ON HIGH－STRENGTH BOLTED FRICTION－TENSILE JOINTS OF CAST IRON DECK PANELS

Ryo YAMASHITA, Ruoxi Li, Takashi YAMAGUCHI, Yugo SHIRAI

pp. 122_29-122_42

DOI:

10.11273/jssc.31.122_29

Abstract

The cast iron deck is a lightweight deck slab with excellent fatigue resistance. There is a problem that the deck is separated when negative bending acts on the joint. As a countermeasure, we proposed a structure that uses both friction joint by the splice plate to the upper surface of the deck and tension type joint of end ribs. In this study, we confirmed the behavior of this joint structure up to the final stage and clarified the limit state by the elemental experiment.

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Article Title

ELEMENT TENSILE LOADING EXPERIMENT ON HIGH－STRENGTH BOLTED FRICTION－TENSILE JOINTS OF CAST IRON DECK PANELS

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18 May. (Last 30 Days)

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