Design of reinforced concrete T-sections according to the second generation of Eurocode

The design procedure for reinforced concrete T-sections according to the standard HRN EN 1992-1-1:2023 (second generation of Eurocode 2) is described in this paper. Rectangular stress-strain diagram was used for concrete, while bilinear stress-strain diagram with a horizontal post-elastic branch without strain limit was applied for the reinforcing steel. Due to the use of such stress-strain diagrams, while designing reinforced concrete T-sections, it is necessary to reach and limit strain in the compressive zone of the concrete, so that the cross-section is in the ultimate limit state. Hence, by using rectangular stress-strain diagram for concrete, it is possible to apply direct analytical procedure for the design of reinforced concrete T-sections, in which, by solving the quadratic equation, the depth of the neutral axis is obtained, and subsequently, the required cross-sectional area of tensile reinforcement and possibly compressive reinforcement. Tables for the design of reinforced concrete T-sections are also provided, which were obtained based on derived equations by direct analytical procedure.