Hi Richard,

thank you for your quick answer.
I'm ok to say that fh is the minimum value, and seems to be the value taken by CII as primary allowable stress.

More precisely, my question is that the code doesn't design "fh" as sustained allowable stress, unless i'm missing something in the code ?

taking "ff" leads in some cases to higher allowable stress that fh, for example : with P235GH at T = 50°C
Rm = 360 MPa
Rp0.2t = 235 MPa

by section 5.2 :
ff = min {f; fcr} = f = Min {Rp0.2t/1.5 ; Rm/2.4} = 150 Mpa

by section 12.1.3.2
fc = fh = min{ f ; Rm/3 } = Min {Rp0.2t/1.5 ; Rm/2.4 ; Rm/3} = 120 Mpa

if you follow the code formulas :
- sustained allowable stress : ff = 150 Mpa
- displacement stress range : fa = 1.25fc + 0.25fh = 120*1.5 = 180 Mpa
- with libéral stress : fa + ff = 330 Mpa

does CII comply with that ?