Disturbed region — where it appears
Named by 3 essays across 3 fields — each of them below, with the objects they name alongside it.
The connection is not a point, and every diagram on this site says it is
Every free body drawn here has joined its members at points. Real structures fail at the joints far more often than in the members, and the reason is that a joint is exactly the region the theory behind every other page explicitly excludes.
When there is no section to design
Beam theory needs a section, and a section needs the strain to be linear across it. Within about a depth of a support, a load, a corner or a hole it is not — and those are the regions structures actually fail in.
The hole that costs nothing, and everything
A service opening removes 30% of a beam's second moment and 0.7% of its deflection. What it costs is not that. Across the opening the shear has nowhere to go but through the two tees, and a tee carrying shear over a length bends.
Named alongside it
The objects these essays reach for when they reach for this one.
Load pathIdealisationPlane sectionsSaint-Venant's principleStress concentrationBolt groupConnectionDeep beamDeflectionEccentricityEquilibriumFlange