A simple method for N-M interaction diagrams of circular reinforced concrete cross sections

Raffaele Di Laora, Carmine Galasso, George Mylonakis, Edoardo Cosenza

Research output: Contribution to journalArticlepeer-review

9 Scopus citations


A novel analytical method is derived for the ultimate capacity interaction diagram (i.e., axial compression, N - bending moment resistance, M) of reinforced concrete (RC) columns with circular cross section. To this aim, the longitudinal rebar arrangement is replaced with a thin steel ring equivalent to the total steel area; moreover, according to modern design approaches, simplified stress–strain relationships for concrete and reinforcing steel are used. Illustrative applications demonstrate that the ultimate capacity computed by the proposed analytical approach agrees well with the results obtained by rigorous methods based on consolidated numerical algorithms. The new solution allows for a rapid, accurate assessment of circular cross section capacity by means of hand calculations; this is especially useful at the conceptual design stage of various structural and geotechnical systems. The method can be easily extended to more general configurations, such as multiple steel rings and composite concrete-steel sections.

Original languageBritish English
Pages (from-to)48-55
Number of pages8
JournalStructural Concrete
Issue number1
StatePublished - 1 Feb 2020


  • analytical solution
  • circular cross section
  • interaction diagram
  • reinforced concrete
  • simplified formulation


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