These straps will not prevent your construction from shifting. It would have to be proven by calcs. You need to fix your racking walls (those parallel to wind direction). It is very hard to prove bent with pin connections to work as a stiff frame for wind loads.
Straps you suggested work to prevent uplift which may or may not be necessary. And yes, they "sort" of fix the post in place.
an example... stiff portal frames designed to resist sliding forces are to be usually fixed by four, six and more bolts each leg. HTT22 and STHD14 have just one bolt hole.
As Daiku said: The stakes are high.
Michal
