On 29 May, 19:58, "Roger Mills" wrote:
In an earlier contribution to this discussion,
Andy Dingley wrote:

On 29 May, 19:00, "Roger Mills" wrote:

It's all a bit academic anyway, because if you hold two bits of wood
tightly together - be it with a bolt or screw - any shear force if
provided by the friction between the mating surfaces rather than by
the bolt or screw.

Not good design though. It's very dificult (i.e. impossibly
impractical) to maintain compressive forces and thus friction in a
design of bolted timber. Moisture or thermal movement, then
compressive yield in the timber, cause such a joint to go loose and
fail after a few seasons.

True, but you can mitigate against that by using a 'spikey plate'[1] between
the 2 bits of wood. That will keep the shear force away from the bolt even
if the full compressive force isn't maintained.

[1] Not sure of the technical term!
--
Cheers,
Roger
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Timber connectors

dg