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actual weight adopted amount arched rib bars bending bowstring girder Boyne Viaduct cantilever cantilever bridge cent centre compression member continuous girder cross girders secured dead load deflection diagonals Division double line driving wheels economic depth effect engine equal flanges of main foot run girders and bracing girders of special girders with cross greater hence horizontal bracing increase independent girder instance iron required lattice girder leading wheels length limiting span line of railway load per foot long-span bridges lower flanges maximum metal required mixed load Multiple normal load obtained ordinary piers plate girders practical proportion rails reduced rolling load secured to lower Span in feet spandrils square inch due Steel stiffening girder straight-link girder strain in cwts strength structure suspension bridge theoretical three main girders ton per foot tons per foot trailing wheels unit strain varying vertical viaduct weight of iron weight per foot wheel base whilst
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...