Erection stability — where it appears
Named by 2 essays across 2 fields — each of them below, with the objects they name alongside it.
Also named here as temporary works — the same set of essays touches all of them, so they are one junction rather than several.
The floor is a beam lying down
A floor plate spans horizontally between the walls that resist a lateral load, carries a distributed inertia load, and has chords, a web and a span-to-depth ratio like any other beam. Its stiffness decides whether the walls share the load by their stiffness or by the area of floor nearest them — and the familiar tributary answer turns out to be neither limit.
The most dangerous day is before it is finished
A structure is analysed once, complete, with every restraint present. It spends weeks in states nobody drew — a beam landed with no deck on it holds 17% of the moment its section is worth, a frame not yet braced buckles at a third of the load it will, and a bolt not yet tightened is a pin where the analysis assumed a fixity.
Named alongside it
The objects these essays reach for when they reach for this one.
Temporary worksAccidental eccentricityBracingCentre of rigidityChord forceCollectorConstruction sequenceDeep beamDiaphragmEffective lengthIn plane stiffnessJoint stiffness