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Structural Engineering and Mechanics Volume 48, Number 6, December25 2013 , pages 833-848 DOI: https://doi.org/10.12989/sem.2013.48.6.833 |
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Ductility and strength assessment of HSC beams with varying of tensile reinforcement ratios |
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Mohammad Mohammadhassani, Meldi Suhatril, Mahdi Shariati and
Farhad Ghanbari
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| Abstract | ||
| Nine rectangular-section of High Strength Concrete(HSC) beams were designed and casted based on the American Concrete Institute (ACI) code provisons with varying of tensile reinforcement ratio as (pmin, 0.2pb, 0.3pb, 0.4pb, 0.5pb, 0.75pb, 0.85pb, pb, 1.2pb). Steel and concrete strains and deflections were measured at different points of the beam\'s length for every incremental load up to failure. The ductility ratios were calculated and the moment-curvature and load-deflection curves were drawn. The results showed that the ductility ratio reduced to less than 2 when the tensile reinforcement ratio increased to 0.5pb. Comparison of the theoretical ductility coefficient from CSA94, NZS95 and ACI with the experimental ones shows that the three mentioned codes exhibit conservative values for low reinforced HSC beams. For over-reinforced HSC beams, only the CSA94 provision is more valid. ACI bending provision is 10 percent conservative for assessing of ultimate bending moment in low-reinforced HSC section while its results are valid for overreinforced HSC sections. The ACI code provision is non-conservative for the modulus of rupture and needs to be reviewed. | ||
| Key Words | ||
| High Strength Concrete (HSC); ductility; tensile reinforcement ratio; compressive strain | ||
| Address | ||
| Mohammad Mohammadhassani, Meldi Suhatril, Mahdi Shariati and Farhad Ghanbari : Department of Civil Engineering, University of Malaya, Malaysia | ||