Concept
Safe theorem — where it appears
The lower-bound theorem read as permission: a load path that can be found and detailed for is a load path the structure will accept.
Named by 2 essays across 2 fields — each of them below, with the objects they name alongside it.
The line that must stay inside
A masonry arch does not stand because its shape is right. It stands because some line of compression can be drawn inside the stonework — any one will do, and there are infinitely many to choose from.
When there is no section to design
Beam theory needs a section, and a section needs the strain to be linear across it. Within about a depth of a support, a load, a corner or a hole it is not — and those are the regions structures actually fail in.
Named alongside it
The objects these essays reach for when they reach for this one.
Deep beamDisturbed regionEquilibriumFunicularGeometrical factor of safetyHingeHorizontal thrustIdealisationLoad pathLower boundLower bound theoremPlane sections