Confinement Factor |
λ≤0.32_{t} |
λ>0.32_{t} |
---|---|---|

Peak stress |
f=(1+0.5_{c,c}λ)_{t}f
_{c} |
f=(0.55+1.9_{c,c}λ)_{t}f
_{c} |

Strain at peak stress |
ε=(1+2.5_{pc}λ)_{t}ε
_{p} |
ε=(-6.2+25_{pc}λ)_{t}ε
_{p} |

Curve functionsx=ε/ε_{pc}y=σ/f
_{c,c} |
y=α(3-2_{a,c}x+α)_{a,c}x(^{2}+α2)_{a,c}-x(^{3}x≤1.0)y=x/(α(_{d,c}x-1)^{2}+x)(x>1.0) |