Ultimate Strength With High Strength Reinforcing Steel With an Indefinite Yield Point

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Title: Ultimate Strength With High Strength Reinforcing Steel With an Indefinite Yield Point

Author(s): Nripendra C. Sinha and Phil M. Ferguson

Publication: Journal Proceedings

Volume: 61

Issue: 4

Appears on pages(s): 399-418

Keywords:

Date: 4/1/1964

Abstract:
Ultimate strength analysis for concrete members reinforced with high strength steel having an indefinite yield point has been used on Bernoulli’s hypothesis, the absence of slip between concrete and steel, and on assumed ultimate concrete strain cc u . Interaction diagrams for eccentrically loaded columns have been plotted based on one such high strength steel. The moment capacities of eccentrically loaded symmetrical columns reinforced with total steel providing p = p’ of 2.5 or 4.0 percent were found to increase gradually with increasing eccentricity to an absolute maximum value of moment for e = m. Detail strain measurements showed that short-time load capacity was not reached until the compressive strain reached 0.0050 to 0.0060 and the rotation angle of a l-in. element reached a minimum of 3600 x 10 6 radians for beams 6-in. deep or 840 x 10 6 radian for a column 9 in. deep (eccentricity = 10.62 in.).