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

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

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Design of Steel Structure
The bracing between two columns of a steel tank will be designed to resist

horizontal, shear due to wind or earthquake + 2.5% of column loads
column loads + full horizontal shear due to wind or earthquake
horizontal shear due to wind or earthquake only
column loads + 2.5% of horizontal shear due to wind or earthquake

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