Abstract
Generally, the bridge pier of reinforced concrete lacks the deformation capacity against an earthquake load. Namely, the compression rupture of reinforced concrete causes the buckling of a compression reinforcing-bar and consequently weakens the bending strength of RC structures sharply. Therefore, in order to improve the deformation capacity of RC structures it is effective to prevent reinforcing-bars from losing strength due to buckling. A concrete-filled steel tube, i.e., a CFT, is employed as reinforcement in this study, since a CFT hardly buckles. A series of experiments is carried out on two types of specimens, i.e., the CFT-RC column in which a CFT is employed as reinforcement and the RC-column in which a conventional deformed bar is used. The laterally cyclic load and the axially constant load are applied. It is found that the CFT-RC-column is excellent at the deformation and energy absorption capacity.
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