空间框架或空间结构（三维桁架）是一种刚性、轻质的桁架式结构，由几何图案中相互连锁的支柱构成。空间框架可用于建筑和结构工程，以跨越大面积区域而无需内部支撑。与桁架类似，空间框架因其固有的三角形刚性而坚固；弯曲载荷（弯矩）沿每根支柱的长度方向以拉伸和压缩载荷的形式传递。
主要应用包括建筑和车辆。
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tubular frame chassis
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图片资料
The roof of this industrial building is supported by a space frame structure.
Simplified space frame roof with the half-octahedron highlighted in blue
This train station in India is supported by a barrel vault structure
Yeoman YA-1 vs CAC CA-6 Wackett frames
Bell 47G
Jaguar C-Type automobile racer tubular space frame (1951-1953)
Mercedes-Benz 300 SL sport car's tubular frame (1954-1957)
Chilean kit car showing off its space frame structure (2013)
Moulton Bicycle at the Museum of Modern Art
2006 Ducati Monster S2R 1000