Control perimeter — 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 effective depth, punching shear — the same set of essays touches all of them, so they are one junction rather than several.
A check made on a perimeter, not on a section
Every shear check in this collection is made on a plane cut through a member. A slab sitting on a column has no such plane, because the shear leaves in every direction at once — so the check is made on a closed line, and a line grows with the column while the load grows with the square of the bay.
A basement is a boat
Every load in this collection presses down and is resisted by strength. Hydrostatic uplift presses up, is resisted by weight, and does not care what is built on it — so the check contains no material property at all. It is a ratio of two weights, and one of them is water.
Named alongside it
The objects these essays reach for when they reach for this one.
Effective depthPunching shearAggregate interlockBallastBuoyancyClamping forceColumn headDrainageEquilibriumFactor of safetyFailure surfaceFlat slab