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 The primary distinction between open-air stadiums —such as those for football or track and field—and indoor arenas lies in the cantilevered roof covering the grandstands. The design objective is not to enclose the entire playing field, but rather to provide shade and weather protection specifically for the spectator areas. Long-span cantilevered structures are the standard approach for open-air stadiums; however, as the cantilever span increases, the structural system becomes significantly more complex. Inadequate consideration of factors such as wind loads, structural deformation, or roof drainage can lead to serious engineering risks. 1. Why Cantilevered Roofs Are Preferred for Stadium Grandstands The core concept behind a stadium’s cantilevered roof is to cover the seating areas while leaving the playing field open to the elements. This offers four key advantages: - Spectator Protection: Provides shade and shelter from rain for the grandstands, enhancing the viewing experience ...