Model | Compressive strength after confinement (MPa) |
---|---|
ACI 440-2R (ACI440.2R-08, 2008) | f′cc = f'co + 3.3Ψ кa ft ft = \(\frac{2 Ef n tf \varepsilon fe}{D}\) εfe = кε εfu |
Lam and Teng (Pham & Hadi, 2014b) | \(\frac{f^{\prime}cc}{{f^{\prime}co}} = 1 + 3.3 \frac{fl}{{f^{\prime}co}}\) \(fl = \frac{{2 E{\text{f}} \varepsilon fe t}}{D}\) |
Ali fallahpour et al. (Wu & Zhou, 2010) | f′cc = f′co + k1klεfu k1 = 2.5- 0.01f′co \(k_{1} = \frac{2 Ef tf}{D}\) |
Richart et al. (Pour et al., 2018) | f′cc = f′co + k1fr fr = \(\frac{2fj tj}{D}\) |