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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Title: Load-bearing capacities of SFRC elements accounting for tension stiffening with modified moment-curvature relations
Author(s): Peter Heek; Peter Mark
Publication: Special Publication
Appears on pages(s): 301-310
Keywords: Tension stiffening bond factor, effective tension area, optimization methods, non-linear analysis.
Abstract:The application of steel-fibre-reinforced concrete (SFRC) with or without additional steel bars has been growing recently in structural engineering. To accurately predict both holistic
load-deflection curves and the redistribution of stresses in statically indetermined systems, calculation methods that take non-linear stress-strain relations and tension stiffening into
account are favoured. Here, a moment-curvature-based approach for SFRC is proposed. In contrast to conventional tri-linear moment-curvature relations, all four stages: initially
uncracked concrete, crack formation, stabilized cracking and yielding of reinforcement, are incorporated explicitly employing optimization methods. On the cross-sectional level, general and dimensionless diagrams have been derived to read the strain state w.r.t. bending moment and mechanical reinforcement ratio, two factors to account for the fibre effectiveness and the ratio of concrete cover to the effective depth. Thereby, tension stiffening is considered adapting a modified stress-strain relation of rebar. Since crack spacing of SFRC elements with additional reinforcement compared to conventionally reinforced concrete is reduced, the
effective tension area and the tension stiffening bond factor have been modified. To verify the new approach, experimental load-deflection curves from literature are recalculated by
numerical integrations of the obtained moment-curvature relations. The results are in good accordance. The paper summarizes the major findings of the contribution “Non-linear
analysis of SFRC elements bearing capacities accounting for tension stiffening by means of modified moment-curvature relations” by the same authors published in (Heek/Mark, 2014).
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