Structural Engineering & Statics
where the load goes
Concept

Web shear — where it appears

The shear crossing the web of a member, which is the applied shear less whatever the inclined chords take. For parallel chords the two are equal; for a tapered member they differ by the chord force times the rate the lever arm changes, and the sign depends on which end is deeper.

Named by 2 essays across 2 fields — each of them below, with the objects they name alongside it.

-1-0.50.51-1-0.50.51σ₁ ÷ f_yσ₂ ÷ f_yvon MisesTrescapure shearthe widest gap is 2/√3 = 1.1547, at pure shear

The shear strength nobody measured

Every web on this site is checked against the yield stress divided by the square root of three, and no test produced that number. It is a consequence of a decision about what makes a metal yield, and the alternative decision gives a different answer by fifteen per cent.

materials · yield criterion 120 kNroot00.20.40.60.810.20.40.60.811.2along the member, tip to rootshear ÷ the shear appliedthe applied shearthe web's sharethe haunch reversedweb shear at the root 33% · reversed 300%

The shear the chords take

Every shear check in this collection has assumed the two chords of a beam are parallel, so that the whole of the shear crosses the web. Taper the member and that stops being true — and the sign of the correction is decided by which end the haunch is at.

internal-forces · inclined chord

Named alongside it

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

Chord forceConfinementDeviatoric stressDiagram relationsDuctilityEquilibriumEquivalent stressFree bodyHaunchHydrostatic stressInteraction diagramInternal forces

All concepts