Masonry buckling check for irregular section

[Lion06]

I have a stone masonry pier that is very tall (on the order of 50' unbraced), but it's not a wall section. It more resembles an angle. I don't believe the standard equations out of ACI 530 are applicable to this section, specifically for a torsional buckling mode.

How would you go about doing a check on this? My first pass was to look at only the one leg to equate it to a wall, but the severe cracking suggests a torsional behavior, so I'm really at a loss on how to proceed.

 

[ash060]

I would probably use the equations from ACI 530, but use the r-value for the minor principle axis

 

[csd72]

at the tip of the L the wall is behaving as a plain single out of plane wall.

 

[Lion06]

Ash-
I didconsider that and will probably go down that route for my next check. I'm still concerned about the torsional aspect since the crack pattern definitely suggests that behavior.

csd-
that was the thought behind using just the wall as the initial buckling check, but the torsional component has me thinking that is only a good starting point.