Structural Engineering & Statics
where the load goes
Concept

Joint rigidity

2 essays name this object, across one field. What follows is each of them, and the objects they name alongside it.

Also named here as moment connection — the same set of essays touches all of them, so they are one junction rather than several.

20H 10.0 M 22.2H 10.0 M 22.2the two base shears add to the applied 20 — the split came from stiffness, not staticsthe sway is exaggerated; a real frame at this load moves a fraction of a millimetre

The frame that leans, and what stops it

A rectangle of pinned bars folds flat. Make the corners rigid instead of adding a diagonal and it does not — which buys an unobstructed opening and costs bending in every member of it.

structures · portal frame worst secondary bending: 24.3% of the axial stress, in the member markedaxial force there 16.7 kN · end moment 0.20 kNm · slenderness of the member 18the same members, the same loads, the same solver — only the releases differ

The joint that is not a pin

Every truss on this site is analysed as though its joints were frictionless pins. Almost none are. The bending that follows is called secondary, which is a claim about size — and the claim is checkable.

structures · truss

Named alongside it

The objects these essays reach for when they reach for this one.

Moment connectionIdealisationMethod of jointsMoment diagramPortal frameSecondary bendingSlendernessStiffnessStiffness distributionSwayTriangulation

All concepts