Structural Engineering & Statics
where the load goes
Concept

Shear reinforcement — where it appears

Steel carrying the tension diagonal of a concrete member's internal truss, usually links crossing the potential shear crack. Its area follows from the shear force, the strut angle assumed and the lever arm, and it is separate from any steel needed to suspend a load into the compression zone.

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

2d = 450column7.2 m bayperimeter u₁ = 4427 mmshear to carry V = 604 kNv = 0.606 against 0.658 N/mm²92% of the resistance used

A check made on a perimeter, not on a section

Every shear check in this collection is made on a plane cut through a member. A slab sitting on a column has no such plane, because the shear leaves in every direction at once — so the check is made on a closed line, and a line grows with the column while the load grows with the square of the bay.

internal-forces · punching shear load on the top chordthe same load, hung from the soffit600 kN in the hangernothing in the same memberchord forces identical to machine precision · hanger steel 1200 mm², shear steel 96 mm² over the same length

The load that has to be lifted

Every shear calculation on this site assumes the load arrives on the top of the beam and walks down a diagonal to the support. Hang the same load from the soffit and the diagonal cannot start — the load has to be carried up to the compression zone first, by a tie no sectional calculation contains.

internal-forces · indirect support

Named alongside it

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

Strut and tieAggregate interlockClamping forceColumn headCompression strutControl perimeterDetailingEffective depthEquilibriumFailure surfaceFlat slabFree body

All concepts