| Summary: | To give columns a high degree of protection against premature yielding under severe earthquakes, a mixed use of ultra high and normal strength steel bars for the longitudinal reinforcement is being adopted as an alternative. The flexural strength beyond the elastic limit of such kind of columns, however, could not be adequately predicted by use of the code's methods (SNI-1992, NZS3101: 1982, AC1318-89). Instead, two methods of Mander et al (1984) and Sheikh and Yeh (1992), mentioned as Method A and Method B in this paper are proposed with a modification in determining the maximum usable compressive strength of concrete. As shown in the experimental results these proposed methods give a satis factory results
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