Behavior of the Compressed Zone of Reinforced and Prestressed High-Strength Concrete Beams


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Title: Behavior of the Compressed Zone of Reinforced and Prestressed High-Strength Concrete Beams

Author(s): H. Manalip, M. Pinglot, and M. Lorrain

Publication: Special Publication

Volume: 149


Appears on pages(s): 209-226

Keywords: beams (supports); bending; compression; ductility; high-strength concretes; prestressed concrete beams; reinforced concrete; strains; Structural Research

Date: 10/1/1994

Although high-strength concrete (HSC) has a brittle behavior in the case of specimens subjected to axial compression, a quite different behavior is obtained in the case of reinforced or prestressed concrete members subjected to bending. In this paper, five tests of HSC beams subjected to pure bending are described and analyzed to quantify their ductility and to deduce the real strain-softening behavior of their compressed zones. Three cases are studied: reinforced concrete, prestressed concrete, and partially prestressed concrete. The comparison of the experimental ultimate deformations (such as plastic rotations, curvatures, deflections) with the calculated values show that the strain-softening of compressed concrete may occur after the peak stress and can be defined by a k' coefficient varying from 0 to 1. For the tested beams, it was found that the use of HSC instead of normal strength concrete (NSC) results in the doubling of the plastic rotation capacity, for reinforced or prestressed beams subjected to pure bending.