Structural Engineering & Statics
where the load goes
Concept

Collapse mechanism — where it appears

2 essays name this object, across 2 fields. What follows is each of them, and the objects they name alongside it.
sagging hinge at 4.69hinge at the fixed endlowest upper bound: 7.29every hinge position gives an upper bound on the collapse loadassumed position of the sagging hingecoefficient 11.66 Mp ÷ L²

After the first yield, which is not the end

A steel beam whose extreme fibre has reached yield has not failed. It has started forming a hinge, and collapse waits until there are enough hinges to make a mechanism.

internal-forces · plastic hinge 100 kN appliedbolt 150.63 kNprying 50.63 kNm = 45n = 40flange 20 mm · one-hingebolt force is 1.51 times the applied load

The force the bolt never saw applied

Pull a tee stub with a hundred kilonewtons and its bolt carries a hundred and fifty. The extra comes from the flange bending and pressing its own edge against the thing it is bolted to, and no free body of the connection as a point contains it.

connections · prying

Named alongside it

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

Plastic hingeBolt tensionConnectionFlangeLever armLower boundMoment armMoment redistributionPlastic momentPryingUpper bound

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