Structural Engineering & Statics
where the load goes
Concept

Shear lag — where it appears

2 essays name this object, across 2 fields. What follows is each of them, and the objects they name alongside it.
x̄ = 19.77connected legoutstanding legLc = 150net areaU = 0.87 of it worksU = 1 − x̄ / Lc = 0.87both halves are geometry — where the centroid sits, and how long the connection is

The angle that uses half of itself

Bolt an angle through one leg and the other leg is not fully working. The correction is one over a length — both halves of it are geometry, neither involves a material, and a two-bolt connection throws away a quarter of the section.

connections · shear lag webb = 3.00 mb_eff = 2.531 mfree edgedrawn flange 2 × 3.00 m = 120000 mm² at 20 mm thickworking flange 2 × 2.531 m = 101238 mm², on a span of 20 m18762 mm² is there, and paid for, and carrying almost nothing

The flange that is not all there

Stress can only get into a wide flange through shear along its junction with the web, and shear takes distance to do it. So the width that is working is set by the span, and a flange 3 m wide on a 20 m span has 18762 mm² of steel that is there, and paid for, and hardly carrying anything.

sections · effective width

Named alongside it

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

Load pathSaint-Venant's principleCentroidConnectionEccentricityEffective widthEfficiencyEmpirical ruleNet sectionPlane sectionsShear flow

All concepts