Abstract
We confirmed the mechanical behavior of exposed type column bases in steel concrete composite columns through the structural tests. The experimental parameters were as follows, axial load level and method of connecting the column of steel concrete member to the footing beam of reinforced concrete member. Total nine specimens were tested, and the ultimate failure mode of eight specimens excluding one specimen under the high axial load failed in flexure at the column base. The structural tests make it clear that the hysteresis curve changes greatly depending on the kind of the connecting bar at column base, and ultimate flexural strength can be evaluated to super posed strength method, in which the ultimate flexural strength of the section of anchor-bolts, reinforcements and concrete below the baseplate. Moreover, proposed evaluation method of restoring force characteristics matches the test result well.
