Instructions on Modern American Bridge Building by G. B. N. (George Bates Nichols) Tower
page 47 of 57 (82%)
page 47 of 57 (82%)
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" " 4, " " 16 "
" " 5, " " 16 " Now, using the formula 2240 b d³ --------- = W, L² [TeX: $\frac{2240 bd^3}{L^2} = W$] we shall have, in round numbers, the following dimensions: For the 1st panel, 25 feet long, 8 x 10 " 2d " 37 " " 8 x 10 " 3d " 49 " " 8 x 10 " 4th " 64 " " 8 x 10 " 5th " 78 " " 8 x 10 For the lattice work, a double course on each side of each truss, in long spans; and a single course, in shorter spans, of 3 x 6, or 2 x 9 plank, bolted at intersections, is sufficient. GENERAL TABLE OF DIMENSIONS FOR ARCH BRACE TRUSS. G.L. VOSE. Span. Rise. Chords. Ties. Braces. Lattice. 50 10 2--8 x 10 1--8 x 10 2--6 x 6 |
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