$$ \sigma_{c,adm,M} = 6 + \frac{R_{ck} - 15}{4}$$
$$ \sigma_{c,adm,N} = 0,7 \; \sigma_{c,adm,M} $$
$$ \tau_{c0} = 4 + \frac{R_{ck} - 15 }{ 75} $$
$$ \tau_{c0} = 14 + \frac{R_{ck} - 15 }{ 35} $$
Denominazione | Tipologia | $\sigma_{s,adm}$ |
---|---|---|
Fe B 22 k | liscio | 120 |
Fe B 32 k | liscio | 160 |
Fe B 38 k | aderenza migliorata | 220 |
Fe B 44 k | aderenza migliorata | 260 |
$$ \tau_b = 1,5 \cdot \tau_{c,0}$$
$$ \tau_b = 3,0 \cdot \tau_{c,0}$$