Shell & Frame Structures

Design and build strong structures

Shell and Frame Structures

Shell structures get their strength from their curved or folded shape (eggs, domes, bottles). Frame structures use connected members (pylons, cranes, bicycle frames). Combination structures use both (a car has a frame with shell body panels). Design the right type for the purpose.

Example

Comparing Structure Types

Shell: strength from shape, no internal frame needed Examples: egg, turtle shell, igloo, Moses Mabhida Stadium dome Frame: strength from connected bars/members Examples: Eiffel Tower, scaffolding, pylon, roof truss Combination: frame + shell Examples: car (chassis frame + body panels), aeroplane Design challenge: Build a structure to hold maximum weight using minimum material

Note

Remember

Shell structures are efficient — they distribute force over the entire surface. That's why eggs are strong despite thin walls. Frame structures are light and allow space inside. When designing, consider: what forces will act? What shape resists those forces best? What materials are available?

Key Vocabulary

Shell structureA structure that gets strength from its curved or folded shape

Frame structureA structure made of members joined together

Combination structureA structure using both shell and frame elements

Load-bearingAble to support weight or force

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Shell structure

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