Stress-Block Parameters for Unconfined and Confined Concrete Based on a Unified Stress-Strain Model Academic Article uri icon


  • Equations to obtain equivalent rectangular stress-block parameters for unconfined and confined concrete are derived for rapid (hand) analysis and design purposes. To overcome a shortcoming of existing commonly used stress-strain models that are not easy to integrate, a new stress-strain model is proposed and validated for a wide range of concrete strengths and confining stresses. The efficacy of the equivalent rectangular stress-block parameters is demonstrated for hand calculations in predicting key moment-curvature results for a confined concrete column. Results are compared with those obtained from a computational fiber-element analysis using the proposed stress-strain model and another widely used existing model; good agreement between the two is observed. 2011 ASCE.

published proceedings


author list (cited authors)

  • Karthik, M. M., & Mander, J. B.

citation count

  • 75

complete list of authors

  • Karthik, Madhu M||Mander, John B

publication date

  • February 2011