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High-Strength Concrete (HSC) tension stiffening members with high tensile strength of concrete may have a low or even absent cross-section ductility, which affects the risk of occurrence of brittle flexural failures. This paper investigates numerically the cause of this problem by comparing and analyzing the moment-curvature relationship of diverse cross-section samples and evaluates the alternative of replacing HSC with High-Strength Fiber Reinforced Concrete (HSFRC) to address it. To perform this task, it has been proposed an original approach to interpret the moment-curvature relationships in terms of non-effective curvature, reduction of ductility index and effective ductility.

Ductility and failure mode of HSC and HSFRC tension stiffening members: a numerical investigation on singly reinforced beams