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Masonry Shearwall Height/Length Ratio

Masonry Shearwall Height/Length Ratio

Masonry Shearwall Height/Length Ratio

(OP)
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.

RE: Masonry Shearwall Height/Length Ratio

(OP)
Sorry that is 7700# total shear...not 2800#

RE: Masonry Shearwall Height/Length Ratio

Have you tried "Reinforced Masonry" design approach?

RE: Masonry Shearwall Height/Length Ratio

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

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