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Which of the following is economical if depth is limited and loads are too large?

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Which of the following is economical if depth is limited and loads are too large?

(a) rolled section beam

(b) truss girder

(c) welded box plate girder

(d) bolted box plate girder

The question was posed to me in my homework.

This intriguing question originated from Plate Girders & General Considerations in section Gantry Girders, Design of Plate Girders & Industrial Buildings of Design of Steel Structures

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The correct choice is (c) welded box plate girder

The explanation: When the loads and span are large, plate girder sections either with riveted/bolted connections or welded connections may be provided. The number of flange plates can be increased depending upon the moment to be resisted. If depth is limited and loads are too large, welded box plate girder is provided. A box girder with riveted/bolted connections can b e provided but it is too costly as compared to welded one. Box girders have great resistance to lateral buckling.

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