Concept
Open section
2 essays name this object, across 2 fields. What follows is each of them, and the objects they name alongside it.
Also named here as shear centre — the same set of essays touches all of them, so they are one junction rather than several.
The moment that will not lie flat
A plane cut exposes three actions. A real cut exposes six, and the fourth of them behaves unlike the others — torsion is resisted by a loop of shear, and one slit down the length of a tube destroys it.
The point that is not in the section
A channel loaded down its web twists. To stop it, the load must be applied through a point outside the steel entirely — in the air beside the section, where nothing can be attached.
Named alongside it
The objects these essays reach for when they reach for this one.
Shear centreShear flowTorsionWarpingEccentricityHollow sectionI-sectionStress resultantTorsion constant