Economics of bridgework, a sequel to Bridge engineering (1921)
Waddell, J. A. L. (John Alexander Low), 1854-1938 · New York, J. Wiley · leaf 290
er-span-length is a trifle lessthan for the single-track trestle, the values for Class 40 being about 1.08 fora 60-foot height, and 1.55 for a 240-foot height. The corresponding valuesfor Class 70 are 1.05 and 1.34. The economic distances from center tocenter of towers are 85 or 90 per cent of… … 1 90 m Fig. 276. Economic Span-Lengths for Low, Single-Track-Railway Trestles. ■JO iO 30 40 30 60 70Hei0 in /ie/, I>p of Mason j to ^se of 2a/f The economics for low, double-track-railway trestles of the typeshown in Fig. 276 are as follows: The lengths of the tower-spans will be identical with…
Bridges
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