Pocketbook of Useful Formulæ and Memoranda
for Civil and Mechanical Engineers

126 moleswokth’s pocket-book Moment of Inertia. (Heppel ) I = Moment of inertia. N = Distance of neutral axis from lower edge of section. E == Height of any particles from lower edge of section. d = Distance of any particles from the neutral axis. B = Breadth of section at any height H. 2 = Sum. A = Difference. T 22BA03) .... , . . . . .. 1 =-------——, it the neutral axis be m tho o centre and the figure symmetrical, if not, I = _ A N!. A.lBiH, N = 2 A Moment of .Resistance. R — Moment of resistance. I = Moment of inertia. N = Height of neutral axis from farthest edge of section. M* = Modulus of rupture. K = Coefficient of fracture. p JKI MI B N ’ R N ' The neutral axis for all practical purposes passes through the centre of gravity of any section. * For determination of the Moment of Inertia by Graphic Construction, see page after next.