Long-span Railway Bridges

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E. & F.N. Spon, 1873 - 157 páginas
 

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Página 156 - ... contemplate the extremes to which men are carried, now by the one and now by the other. As from antagonist physical forces, as from antagonist emotions in each man, so from the antagonist social tendencies men's emotions create, there always results, not a medium state, but a rhythm between opposite states. The one force or tendency is not continuously counterbalanced by the other force or tendency ; but now the one greatly predominates, and presently by reaction there comes a predominance of...
Página iii - Long-Span Railway Bridges, comprising Investigations of the Comparative Theoretical and Practical Advantages of the various adopted or proposed Type Systems of Construction, with numerous Formulae and Tables giving the weight of Iron or Steel required in Bridges from 300 feet to the limiting Spans ; to which are added similar Investigations and Tables relating to Short-span Railway Bridges. Second and revised edition. By B. BAKER, Assoc. Inst. CE Plates, crown 8vo, cloth, 5*.
Página 118 - ... girders with gusset attachments to main girders, and the horizontal bracing, of a double line of railway carried upon two main girders, may be estimated, according to Sir Benjamin Baker, as follows : — 10 to 100 feet span, .... 14 cwts. 100 „ 150 „ , 15 „ 150 „ 200 „„ . . . 16 „ Where the two lines of railway are supported upon three main girders, the above loads may be reduced by 2 cwts. per foot, and where upon four girders, by 4 cwts. per foot.t "The weight of the cross girders...
Página 123 - ... for a 20 ft. span, to 9 cwt. for a 275 ft. span ; but it will be understood that considerable modification in these weights, both of a plus and minus nature, may be effected by a variation in the depth or arrangement of the cross girders.

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