骨組鋼構造物における溶接欠陥を持つ部材の全面降伏後破壊性能に関する研究(第 1 報)(<特集>溶接部の組織とじん性)

概要

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The study has been made on fractur behavior of welded joints with defects in steel framed structure, especially, of column-beam welded connection. The connection is required sufficient load capacity and/or ductility to resist against large earthquakes. Therefore, in steel framed structure, general yielding fracture behavior of welded joints should be investigated. In this report, static tensile tests and elastic-plastic 2 dimensional F.E.M. analyses of welded joint with notches were carried out, considering 3 fracture controlling factors (notch toughness, notch length and reinforcement). In the fracture testing of these connections, fracture mode is divided into two types; that is, one is ductile fracture and the other is general yielding brittle fracture. In steel framed building, the fracture mode depends on notch toughness rather than notch sizes. Therefore it is much important to control notch toughness. Reinforcement increases fracture load, but it does not increase ductility. At general yielding stage of welded joint with notches, COD at notch tip is nearly proportional to overall strain ε_∞ in sufficient large gage length. For column-beam welded connection made by C-Mn steel, non-dimensional COD δ'-ε_∞/ε_y relation is given by the following equation. [numerical formula]
社団法人溶接学会の論文
1981-01-05