鋼構造柱-はり溶接接合部の低サイクル疲労に関する研究

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The low cycle fatigue life of welded joint of steel beam-to-column connection which was subjected to repeat stresses by wind or earthquake loads were investigated. The specimens were T type connection consisting from of about 1/2 scale of perimeter column and beams. Test parameters were 1) scallop or non-scallop, 2) backing bar or non-backing bar. The results of low cycle fatigue testing of welded joints of beam-to-column were as follows; (1)The fractures of non-scallop specimens were the through width crack of the beam flange by crack propagation from (1)the groove weld between the diaphragm and the beam flange for non-backing bar, (2)the fillet welds between the backing bar and the beam flange when the displacement-amplitude was under 1.25 δ_p(elastic displacement of beam corresponding to fall plastic moment), (3)the groove weld between the diaphragm and the beam flange when over 1.0 δ_p for backing bar. (2)The fractures of scallop specimens were also the through width crack of the beam flange by crack propagation from (4) the groove welds between the diaphragm and the beam flange when the displacement amplitude was under 0.87 δ_p, (5) the bottom of the scallop when over 1.0 δ_p for non-backing bar. (6) The fillet welds between the backing bar and the beam flange for backing bar. (3) The fatigue life of scallop specimens deteriorated to about 20% to 30% of the fatigue life of the non-backing bar and fatigue life of the non-scallop specimens for non-backing bar, and deteriorated to about 10% to 25% of these for backing bar.
一般社団法人日本建築学会の論文
2005-03-20

鋼構造柱-はり溶接接合部の低サイクル疲労に関する研究

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