Structural Engineering & Statics
where the load goes
Generator

The bolt-methods generator

Rendered here at the parameters it defaults to, with every essay that calls it — which is the same list as the blast radius of changing it.
The elastic method and the instantaneous centre, comparedGroup capacity in units of one bolt, against the eccentricity of the load, for a 3 by 2 group. The instantaneous centre is above the elastic method everywhere, by 13.31% at 150 mm — and the gap is a curve rather than the single factor it is usually quoted as.0501001502002503003504000123456eccentricity of the load, mmgroup capacity, boltsinstantaneous centreelastic+13.31%

2 essays call bolt-methods. The drawing above is what it returns with no arguments at all; every call below passes it something, because a placement that passes nothing draws whichever member of the family the generator happens to default to rather than the one its essay argues about.

Where it is called

Changing this generator changes every one of these figures.

100 kNe = 150centroidworst bolt 50.37 kNSix bolts · direct shear 16.67 kN eachelastic vector method Connections

The bolt that carries more than its share

Six bolts, one hundred kilonewtons, and a worst bolt carrying fifty. The load is shared equally and the torque is not, and the second one is invisible on any drawing where the connection is a point.

 100 kNpeak 0.88Two points at maximum radiusthe radius rule finds the peak hereequal radius, stresses differ ×1 Connections

The corner that is not the worst point

Check the point furthest from the centroid. It is the standard rule for a weld group under an eccentric load, it is exactly right for some shapes, and for others it misses the peak by sixteen per cent — or picks one of four points it cannot tell apart whose stresses differ by two thirds.

The library, page 1 of 4 — where bolt-methods sits