Discussion
Which principle makes a space frame efficient?
Answer: C
A triangulated bay cannot deform without changing the length of a member, so the structure resists load axially rather than in bending and every member is used efficiently. Bending is a wasteful way to carry load because most of the material is far from the maximum stress. Adding a stressed skin produces a different structure again, which some designers do use. Reading the definition literally, rather than recalling a formula, is the reliable route through questions of this shape.
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