Principles of Economy in the Design of Metallic Bridges

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J. Wiley, 1885 - Bridges - 195 pages

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Page 103 - Bridge a span of 1,710 feet, the ratio there, also is 1 to 3-65, hence, to enable anyone to appreciate the size of the Forth Bridge, we have merely to suggest the following simple rule of three sum: As a Grenadier Guardsman is to a new-born infant, so is the Forth Bridge to the largest railway bridge yet built in this country. Bridges a few feet larger in span than the Britannia have been built elsewhere, but they are baby bridges after all.
Page 103 - ... the process much, and obtain valuable positive results, if we confine our attention at first to the comparative weights of iron required in the different methods of constructing the superstructure, which, after all, is by far the most important element in determining the cost of a long-span bridge. The size of a bridge is very commonly the popular standard by which the eminence of its engineer is measured...
Page 3 - In the book now presented the error often fallen into namely, of treating the web-system and the chords of singlespan bridges separately or independently, has been avoided; and by multiplying the strain of each member of a fully loaded bridge of a fixed number of panels with the length of the member, and then adding the products, formulas were obtained which agree with American practice, and with the author's own experience of some eighteen years.

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