The 'space frame' roof structure derives its efficiency from:
Choose the correct answer
All members in bending only
3D triangulation — members carry axial force only; loads distributed in all directions simultaneously for large-span efficiency
Only using very heavy steel plates
Only rigid frame action
Correct Answer
B. 3D triangulation — members carry axial force only; loads distributed in all directions simultaneously for large-span efficiency
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Space frame (3D truss): triangulated 3D structure with members in multiple planes. All members carry axial force only (no bending if pinned joints). Load shared in two directions simultaneously → very efficient material use for large spans (30–100 m). Used for: stadiums, airport terminals, exhibition halls. Typical: square-on-square or square-on-diagonal grid. IS 806 covers tubular steel.
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