The finite displacement theory considering the effect of shear deformation is formulated. In this research, the computer program using the stiffness equation of reinforced concrete structures has been developed for the ultimate deformation analysis under cyclic loadings. Cyclic loading tests of reinforced concrete columns under axial force was carried out and the applicability of this theory was investigated. The experimental values obtained from specimens in which axial force, web reinforcement ratio and a/d were changed are compared with the calculated values. It is possible to predict the flexure or shear failure theoretically, when the instability of structures is considered.
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