Formulas: Compressive Strength

Equation I2-9a

P_{n o}=P_{p}

P_{n o}=P_{p}-\frac{P_{p}-P_{y}}{\left(\lambda_{r}-\lambda_{p}\right)^{2}}\left(\lambda-\lambda_{p}\right)^{2}

P_{y}=F_{y} A_{s}+0.7 f_{c}^{\prime}\left(A_{c}+A_{s r} \frac{E_{s}}{E_{c}}\right)

P_{n o}=F_{n} A_{s}+0.7 f_{c}^{\prime}\left(A_{c}+A_{s r} \frac{E_{s}}{E_{c}}\right)

F_{n}=\frac{9 E_{s}}{\lambda^{2}}

F_{n}=\frac{0.72 F_{y}}{\left[\left(\frac{D}{t}\right) \frac{F_{y}}{E_{s}}\right]^{0.2}}

(E I)_{e f f}=E_{s} I_{s}+E_{s} I_{s r}+C_{3} E_{c} I_{c}