Design of Steel Structure
Hudson’s formula gives the dead weight of a truss bridge as a function of

bottom chord area
effective span of bridge
heaviest axle load of engine
top chord area

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Design of Steel Structure
The elastic strain for steel is about

1/2 of strain at the initiation of strain hardening and about 1/12 of maximum strain
1/12 of strain at the initiation of strain hardening and about 1/120 of maximum strain
1/12 of strain at the initiation of strain hardening and 1/200 of maximum strain
1/24 of strain at the initiation of strain hardening and about 1/200 of maximum strain

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