Table 1 Equations for axial strength of FRP reinforced concrete columns.

CSA- S806-12 ⁴³

\(P_{n} = \alpha_{1} f^{\prime}_{c} (A_{g} - A_{FRP} )\)

\(\alpha_{1} = 0.85 - 0.0015f^{\prime}_{c} \ge 0.67\)

AS-3600 ⁴⁴

\(P_{n} = 0.85f^{\prime}_{c} (A_{g} - A_{FRP} ) + 0.0025E_{FRP} A_{FRP}\)

Mohammed et al. (A) ¹⁴

\(P_{n} = 0.85f^{\prime}_{c} (A_{g} - A_{FRP} ) + \varepsilon_{p} E_{FRP} A_{FRP}\)

\(\varepsilon_{p} = 0.002\)

Mohammed et al. (B) ¹⁴

\(P_{n} = 0.9f^{\prime}_{c} (A_{g} - A_{FRP} ) + \varepsilon_{fg} E_{FRP} A_{FRP}\)

\(\varepsilon_{fg} = 0.002\)

Hadhood et al. ¹⁵

\(P_{n} = \alpha_{1} f^{\prime}_{c} (A_{g} - A_{FRP} ) + 0.0035E_{FRP} A_{FRP}\)

\(\alpha_{1} = 0.85 - 0.0015f^{\prime}_{c}\)

Tobbi et al. ⁴

\(P_{n} = \alpha_{1} f^{\prime}_{c} (A_{g} - A_{FRP} ) + \alpha_{FRP} f_{FRPu} A_{FRP}\)

\(\alpha_{1} = 0.85,\alpha_{FRP} = 0.35\)