Notation For the purpose of this Clause—
a0, a1 = out-of-square dimensions of flanges
a2, a3 = diagonal dimensions of a box section
b = lesser dimension of a web panel
bf = width of a flange
d = depth of a section
do = overall depth of a member including out-of-square dimensions
d1 = clear depth between flanges ignoring fillets or welds
e = web off-centre dimension
l = member length
f = out-of-flatness of a flange plate
v = deviation from verticality of a web at a support
w = out-of-flatness of a web