Long-span Railway Bridges

actual weight adopted amount arched rib bars bowstring girder 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 limiting span line of railway load per foot long-span bridges lower flanges maximum metal required mixed load Multiple normal load obtained piers plate girders practical proportion rails rolling load secured to lower short-span railway bridges Span in feet spandrils stiffening girder straight-link girder strain in cwts structure suspension bridge t₁ Tables theoretical three main girders ton per foot tons per foot trailing wheels Type 1.-Plate Girders unit strain varying vertical viaduct weight of iron weight per foot wheel base whilst