Fs2
= b(De1
+ De2)sfc
/ ((sci
- sfc)Sd)
De1
= De2
= D/200 = 769.6 / 200 = 3.848
b = 1
Sd = 2dt
= 2 x 51x10-6 = 0.102 x 10-3
sci is to be determined using le from 9.6.4.1.1.2b).
le = pk2(EIc(de1+de2)/L)0.5
Ic = 25.4 x 2683 / 12 = 40.7 x 106
le = p x 1.0(205000 x 40.7 x 106 x 2 x 51 x 10-6 / 9000)0.5 = 967mm
lF = (le/ry)(tf/D) = (967/57.1)(25.4/769.6) = 0.559
n = 0.993 (From Table 9)
lLT = lek4hn/ry = 967 x 0.9 x 1.0 x 0.993 / 57.1 = 15.1
sci = p2ES/lLT2
sci = p2 x 205000 x 1.15 / 15.12 = 10205 N/mm2
Fs2 = 3.848 x 97.5 / ((10205 - 97.5) x 0.102 x 10-3) x 10-3
Fs2 = 0.4 kN