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Reinforced Masonry Design

Reinforced Masonry Design

Reinforced Masonry Design

(OP)
I have a general question about masonry design (which is really dumb).

I am referencing ACI 530-08 equation 2-23 (fv=V/bd). I am wondering what is the appropriate value to use for the bd in the equation. Say I have a 20’ long 8” wall that is grouted at 40” o.c. do I use bd = 7.625*20*12 or do I figure an 8” wall grouted 40” o.c. has an equivalent area of 58.3 square inches per foot so bd = 58.3*20?

The equation, while intuitive, isn’t written that well in my opinion.

RE: Reinforced Masonry Design

For the appropriate shear area and effective weight use the "equivalent solid thickness" of the CMU based on the filled cells.

That value can be found in Table B-3a, page 278 of the Reinforced Masonry Handbook by Amrhein.

Mike McCann, PE, SE (WA)


RE: Reinforced Masonry Design

I use the net cross-sectional area from NCMA TEK 14-01B

RE: Reinforced Masonry Design

(OP)
That is what I thought, but it is just not written well in the equation and then the definition lists b as "width of section".

RE: Reinforced Masonry Design

Agree with UcfSE, use the NCMA TEK paper to get the effective section properties.

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