Economics of bridgework, a sequel to Bridge engineering (1921)
Waddell, J. A. L. (John Alexander Low), 1854-1938 · New York, J. Wiley · leaf 287
ECONOMICS OF STEEL ARCH-BRIDGES 249 … CHAPTER XXVII ECONOMICS OF STEEL TRESTLES, VIADUCTS, AXD ELEVATED RAILROADS The usual railway steel trestle consists of alternate towers and inter-mediate spans. In determining the economic span-lengths for such astructure, there are two separate factors to be studied: 1. The ratio of length of…
Bridges
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