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8" CMU - Simple Question
2

8" CMU - Simple Question

8" CMU - Simple Question

(OP)
Here's the problem - 8" CMU wall, unreinforced, lateral wind force on wall is 29.4 psf, vertical axial compressive force on wall is 460 lbs/linear ft live, 345 lbs/linear ft dead.  Wall has no grouted cores and has full mortar bedding.

For some reason I'm doubting myself.  I say this will not come close to calculating as the tensile stress in the wall due to lateral wind far exceeds the ACI 530 allowable of 25psi.

Do you agree?

RE: 8" CMU - Simple Question

You didn't give the span, but I assume this is the same wall as in your other thread.  I agree.

RE: 8" CMU - Simple Question

(OP)
Oops!  Sorry.  The wall height is +16'.  Thanks hokie66!

When a man has been beaten on all-day-long by folks who dont believe the numbers, one tends to doubt one's self.  Its been a long day!

RE: 8" CMU - Simple Question

i agree

Arguing with an engineer is like wrestling with a pig in mud. After a while you realize that they like it

RE: 8" CMU - Simple Question

Several problems:

1. h/t is very high.

2. It is doubtful your wall has full mortar bedding anywhere in the wall unless the bedding course or if you are in some strange place.

Where are you located and what is the applicable building code since ACI 530 has no legal standing unless is it adopted by a legal authority, referenced by a code authority or if you want to sign off on it and accept the liability.

In some cases, depending on the configuration and intersecting walls, even the "lowly" empirical design section of ACI 530 could show that this could possibly be in compliance.

If you are bound and determined to do a full engineered analysis, do you have any idea of what the real f'm (not assumed) of the existing walls is since this can be critical in some of the analysis methods.

Grouting without rebar is usually not that beneficial, but there are studies that show some very great gains.

Is there a link to your previous posts that may provide additional information?

Dick

RE: 8" CMU - Simple Question

Thanks JAE... what program did you use for the interaction diagram?

Dik

RE: 8" CMU - Simple Question

Thanks... Dik

RE: 8" CMU - Simple Question

Agree with others...not good.  CM also makes a good point about the full bedding...not likely.  Revise your assumption (which makes it even worse).

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