Influence of Various Weld Defects of Weld Connections on Plastic Deformation Capacity of Steel Flexural Members

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This study discusses the influence of various weld defects of weld connections on plastic deformation capacity of steel members used for moment frames.In application of ceramic end tabs for beam flange weld in beam-to-column welded connection, the defect of penetration is often observed at the start and the end points of the weld first pass. Tests on sub-assemblages were carried out to clarify the influence of the location of defect, the length of defect, welding type (shop welding or field welding) and the strength of weld metal. When square hollow section columns are welded to through diaphragms, the defect of penetration is often observed at column corner. Tests were carried out to clarify the influence of the location of defect, the height of defect and the loading direction (0 degree or 45 degree). For the purpose of examining the strain concentration at the beam end or column end, the numerical analyses were carried out by using the general finite element program.