Refers to the structural
design of buildings in which the unsupported length of horizontal beams
(between columns) is greater than 50 feet. The unsupported span may be
up to 200 feet long, but typical long-span structures feature
unsupported beam lengths from 50 to 70 feet. Long-span structures
typically use steel trusses instead of beams. The principal benefit of
long-span construction is more column-free open space for flexibility.
The cost of this flexibility lies in the use of more expensive trusses
and the loss of vertical space.
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