Concept
Rotational spring — where it appears
2 essays name this object, across one field. What follows is each of them, and the objects they name alongside it.
Neither pinned nor rigid, which is every real connection
Frame analysis offers two options for a joint and reality supplies a continuum between them. Worse, the boundaries are not properties of the connection at all — the same end plate is rigid on a short stiff beam and semi-rigid on a long slender one.
A joint made of springs in series
A connection's stiffness is not a property of the connection. It is the series combination of the flexibilities of everything the force passes through — so the softest component decides, and stiffening any of the others changes almost nothing.
Named alongside it
The objects these essays reach for when they reach for this one.
ConnectionJoint stiffnessClassificationColumn webComponent methodFlexural rigidityLever armMoment redistributionMoment rotationPryingSemi rigidSeries stiffness