Timber frame brace and loads

[bannerd]

Does anyone have the calculation for bracing on the bottom of a post?  I know the longer the knee the more resistance but too long and it might be in the way of windows.

Currently I'm using 40" knees which I lagged into a 8x8 Sill pocket.  I'm trying to figure out how much pressure would be needed to shear the 8x8.  The 8x8 is 8ft tall.

We do have bracing above @ 40" as well which makes an X, curious to know the failure and are what weight.

[bannerd]

Species of wood is eastern white pine.

I'm going to say with X braces the lateral load is extremely high.  I'm just curious how strong these systems are.

Also, I'm sick of making knees...

[Den-Den]

I don't have the answer you are looking for.  I don't believe a single equation will cover the possibilities.
Failure modes that come to mind:
* compression perpendicular to grain in the brace pocket
* lag bolts shearing or pulling out
* post fail in bending above the lower brace (should resist a very high load)
* brace buckling (this seems unlikely to me)

The correct approach would be to check each of the above and any that I did not think of to find what fails first.