STRUCTURAL BEHAVIOR OF EXPOSED TYPE STEEL COLUMN BASE HAVING BASE PLATE WITH EMBEDDED RIB REINFORCEMENTS

We propose a new type of exposed steel column base with a base plate reinforced from underneath by rib plates embedded in the base concrete. A series of cyclic loading tests on actual-sized square tube column base specimens show that the combination of a short square stub column and rib plates arranged radially outside the stub column can effectively reinforce the base plate from underneath. Local behavior of the column base is estimated through plastic and finite element analyses; the findings of these analyses can be used for preventing local collapse and fracture of reinforced column bases.