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Computers and Concrete
  Volume 12, Number 4, October 2013 , pages 537-552

Flexural ductility of RC beam sections at high strain rates
Akhilesh K. Pandey

    Computation of flexural ductility of reinforced concrete beam sections has been proposed by taking into account strain rate sensitive constitutive behavior of concrete and steel, confinement of core concrete and degradation of cover concrete during load reversal under earthquake loading. The estimate of flexural ductility of reinforced concrete rectangular sections has been made for a wide range of tension and compression steel ratios for confined and unconfined concrete at a strain rate varying from 3.3 x 10-5 to 1.0/sec encountered during normal and earthquake loading. The parametric studies indicated that flexural ductility factor decreases at increasing strain rates. Percentage decrease is more for a richer mix concrete with the similar reinforcement. The confinement effect has marked influence on flexural ductility and increase in ductility is more than twice for confined concrete (0.6 percent volumetric ratio of transverse steel) compared to unconfined concrete. The provisions in various codes for achieving ductility in moment resisting frames have been discussed.
Key Words
    strain rate, seismic behavior; constitutive relationships; reinforced concrete frames; confinement, ductile detailing
Akhilesh K. Pandey: CSIR-Central Building Research Institute, Roorkee, 247667, Uttarakhand, India

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