Pocketbook of Useful Formulæ and Memoranda
for Civil and Mechanical Engineers

177 OF ENGINEERING FORMULÆ. Lean’s Stresses. b E ---K—°________ | y E x F 11 in cbm d&l Coefficient booms Coefficient lire load .. .. Coef. dead load 10 6 + 28 -8 20 — 12 A&F.B&EC&D G4N H &M — 28 -28 -48 i _+28 I 4-60 - +64 B ~ ~ - • J L M N a & o b åi n c & m M e & k f &j i g & i Coefficient live; load .. .. j Coef. dead load ! A &H I 28 28 I + 28 -28 B&G Coefficientbooms -f- 28 + 48 1 J 21 j 21 J 1 -20 +20 C4F D&E + 64 3 15 -12 I* H J & M K*L -28 — 48 -60 Bowstking Bridges. “ " T = Tension of main tie, and = Thrust of arch at crown, in tons. 8 = Span „ „ in feet R — Rise ,, „ n L = Total load distributed in tons. x = Distance of any part from centre of girder in feet T=Ä 8R Thrust at any other part of arc =* Greatest tension at any perpendicular = - nearly, when toK “• “111>, u» N