Significance of Stress-Block Parameters on the Moment Capacity of Sections Under-Reinforced with FRP

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Title: Significance of Stress-Block Parameters on the Moment Capacity of Sections Under-Reinforced with FRP

Author(s): G. Urgessa, S. Horton, M.M. Reda Taha, and A. Maji

Publication: Special Publication

Volume: 230

Issue:

Appears on pages(s): 1531-1550

Keywords: FRP; HPC; stress-block parameters

Date: 10/1/2005

Abstract:
For under-reinforced concrete sections reinforced with FRP, failure of amember is initiated by rupture of the FRP bar and the typical ACI compression stress-block might not be applicable. This is because of the fact that the corresponding strainat the extreme fiber of the concrete will not reach the ultimate strain in concrete.Therefore, accurate computation of flexural capacity requires developing equivalentstress-block parameters that represent the stress distribution in the concrete at aparticular strain level. While the ACI 440 permits the use of a simplified approach tocalculate moment capacities that do not require equivalent stress-block calculations,the significance of this simplification needs to be examined. This paper suggests afamily of curves based on the extreme fiber strain in concrete using three existingstress-strain models. The paper highlights the significance of these curves for differentvalues of compressive strengths of concrete.