Describing structural systems that bridge large distances without intermediate supports, typically over 100 feet, requiring specialized engineering to handle the increased loads and deflections. Long-span structures enable large column-free spaces for venues like airports and stadiums.
Compound of 'long' (extended distance) and 'span' (distance between supports), terminology that developed with 19th-century railway and bridge engineering. Architectural usage expanded in the 20th century as new materials enabled unprecedented interior spaces.
Denver International Airport's fabric roof is one of the world's largest long-span structures, covering 1.5 million square feet with a cable-supported membrane that mimics the Rocky Mountains! The engineering challenge isn't just supporting the roof's weight, but handling massive wind and snow loads across such vast distances.
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