| 摘要 |
PROBLEM TO BE SOLVED: To provide a joint structure whose manufacture is easy by using a column core, forming a projection part for the inside on an upper end, forming a projection part joining a lower side steel frame column on a lower side, and making them the projection parts corresponding to a diaphragm. SOLUTION: A joint structure uses a column core 1 for forming projection parts 11, 12 corresponding to a diaphragm on the joining part of upper and lower deformed steel frame columns 2, 3 whose outside diameters are different. The diameter Do of a column body part 10 is made the substantially same as the outside diameter size of the lower side steel frame column 3 of a large diameter, and formed of equivalent thickness. A projection part 11 seriously forms an inside projection part 11a largely projecting only size necessary for joining of the upper side steel frame 2 toward the inside and an outside projection part 11b necessary for joining of a steel frame beam. The inside projection part 11a forms thickness (t) and size A so that a support angle in which the flow line of vertical load which leads to a column body part 10 from the upper side steel frame column 2 is formed is 45 degrees or larger. Thereby welding can be surely efficiently performed and quality management of welding can be enhanced high.
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