Authors report the test results of the 12 specimens of columns with side walls under repeated horizontal load with fixed axial force. Variables are the spacing of hoop, existence of eccentric connection of side walls to a column, existence of partial slits between the column and the side walls and difference of loading history. In this paper, we describe the failure mode influenced by the variables, strength deterioration ratio, torsional deformation by eccentric connection, axial load carrying capacity, damping performance, etc. And the test results were compared with the calculated values on strength and stiffness.
Resultantly, difference of hoop ratio and existence of the structural slit made difference of failure modes from total failure as a whole to separated failure of a column and side walls. And it was made clear that deformation ability was improved by the partial slit. Although strength can be presumed under some deviation from the existing evaluation methods, failure mode can be hardly presumed.
