Economics of bridgework, a sequel to Bridge engineering (1921)
Waddell, J. A. L. (John Alexander Low), 1854-1938 · New York, J. Wiley · leaf 289
, being about 2 per cent too great fora 60-foot height, and about 6 per cent too small for a 240-foot height. In Fig. 276 are given the economic span-lengths for various heights oflow, single-track-railway trestles consisting of towers with two rocker 250 STEEL TRESTLES, VIADUCTS, AND ELEVATED… … ao 100 IZO/fe/^hf of lower m feef. 240 260 Fig. 27a. 140 160 JdO ZOO 220 Top of Masonry fo Base of 2a}/. Economic Span-Lengths for High, Single-Track-Railway Trestles. span-length. It has been assumed that the length of tower-span would inall cases be 30 feet. Actually, this length should vary…
Bridges
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