Structural Engineering & Statics
where the load goes
Concept

Parallel axis theorem

2 essays name this object, across one field. What follows is each of them, and the objects they name alongside it.
neutral axiscontribution of each striptotal I = 79.86 × 10⁶the outer strips do almost all of the work

The material far from the middle does nearly all the work

A strip of steel contributes to bending stiffness in proportion to the square of its distance from the centre. Move the same steel outward and the section gets stiffer for nothing.

sections · second moment neutral axispeak 82.8stressflow, q = VQ ÷ Imean stress 38.46 — the value a shear divided by an area would givepeak 2.15× that, and in the place bending ignoresthe flow is continuous; the stress jumps wherever the width doesq = 820.0connectors of 20000 each, at 24 centres, are what make this one section

The section made of pieces

Two plates bolted together are twice as strong as one plate. Two plates made to act as one section are eight times as stiff. The difference is entirely in the joint, and the joint has a calculable spacing.

sections · second moment

Named alongside it

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

Neutral axisSecond moment of areaBuilt up sectionCentroidDelaminationFirst moment of areaI-sectionSection modulusShear connectionShear flow

All concepts