Design of Steel Structure
If the floor is supported at or near the bottom but top chords of a bridge is not braced, then the bridge is called

Through type
Deck type
Half through type
Double deck type

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Design of Steel Structure
The mechanism method and the statical method give

lower and upper bounds respectively on the strength of structure
upper and lower bounds respectively on the strength of structure
lower bound on the strength of structure
upper bound on the strength of structure

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