高連載荷時の鋼構造接合部の力学的挙動に関する実験的研究 : その1. 鋼素材, 突合せ溶接接合部, 高カボルト摩擦接合部の載荷実験

概要

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Strain rate effects in steel structural joints can be one of most significant factors to assess the safety in the structures against high speed loadings like as earthquake shocks. This paper deals with an experiment and the results in the case when typical structural joints are subjected to high speed tensile loadings. Specimens consisted of base metal of mild steel, the butt-welded joints and high strength bolted connections. A special testing machine was manufactured and used so that the tensile loads were applied to the bottoms of the specimens suspended from the reaction frame, with the lever by engaging the cam while using the clutch, after the rotating speeds of the flywheel were controlled at the selected constant values between 350 to 1 500 r. p. m.. The loads and the deflections between the marked points of the specimens were detected and the values were recorded to a data recorder throughout the experiments. Then, the mechanical properties of the specimens were compared with those obtained from the results of the static tensile loading tests. From the test results, it can be seen that the ultimate strengths of the bolted connections are not significantly influenced by the loading speeds, in.spite of the distinct increase of the strengths of base metal and the buttwelded joints.
社団法人日本建築学会の論文
1986-01-30