Abstract
A new method to enhance the moment-curvature relations of reinforced concrete column sections in post-yield range of deformation was developed. The point of the idea is to introduce the sequential yielding of various grade longitudinal bars in a section. The section then does not show any significant reduction in load carrying capacity up to the yielding of highest grade bars. To confirm the advantages of the new method, flexural analyses and loading tests were carried out on reinforced concrete columns with various grade longitudinal bars. The results indicated the advantages of the combined use of various grade longitudinal bars.
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