Masonry Shearwall Height/Length Ratio

[TimmyH76]

Are there any guidelines or code provisions in IBC or ACI 530 for masonry shearwall height to length ratios? I am working on a small airplane hanger. The walls on eiher side of the large door are giving me the trouble. The walls are 2'-9" long and 20' tall as it is now. I have a 2800# unfactored shear (wind) load acting at the top of the wall. Should I be looking at modify the design to something else...any recommendations would be appreciated. Thank you.

 

[TimmyH76]

Sorry that is 7700# total shear...not 2800#

 

[kslee1000]

Have you tried "Reinforced Masonry" design approach?

 

[DaveAtkins]

There are no limitations to how tall and thin a masonry shear wall can be. Your moment is 77000 lb-ft (I assumed half of the 7700 lbs to each wall). Your "d" will be 33" minus 4" = 29". Assuming 12" CMU, "K" will be 95, and rho will be 0.009. Therefore, roughly 3 sq. in. of rebar is required, which seems to be excessive.
I would try a steel portal frame--don't you have a steel lintel spanning across the door anyway?

DaveAtkins