Originally Posted by Hartlepool

I'm not saying that this is how it was done in this post,just posting some info,thats all.
If a lower level of the columns had previously had its boltings and fishplates changed out for shear plates/bolts,this could cause a uniform collapse of the structure.
For example,if the parking was open for access then the Column covers could of been removed,bolts changed out one at a time and replaced for inferior fastenings.
The fishplates could have also been addressed at the same time.
Looking at that building,it would take a crew of 6 perhaps a weekend to do the job,maybe less than that,but no longer.
Shear bolts/plates are designed to shear on impact or movement,they can be installed to shear on horizontal,vertical or diagonal movements.
Shear plates and bolts are very quick and easy to make.
They can be made in your garage,garden shed or cellar.
(PS,sorry,I couldn't stay away from this place.)