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Tensile structure
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=== Structural forms === [[Air-supported structure]]s are a form of tensile structures where the fabric envelope is supported by pressurised air only. The majority of fabric structures derive their strength from their doubly curved shape. By forcing the fabric to take on double-curvature the fabric gains sufficient [[stiffness]] to withstand the loads it is subjected to (for example [[wind]] and [[snow]] loads). In order to induce an adequately doubly curved form it is most often necessary to [[pretension]] or prestress the fabric or its supporting structure.
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