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Section Modulus - Masonry Wall

Section Modulus - Masonry Wall

Section Modulus - Masonry Wall

(OP)
Is it accurate to calculate the section modulus of a masonry wall for in-plane bending (shear walls) using an equivalent solid thickness and treating it as a rectangular section?

I have looked in NCMA TEK, but do not see any calculations for in-plane section properties.

RE: Section Modulus - Masonry Wall

I think those properties are listed in the CERM

RE: Section Modulus - Masonry Wall

For in plane section properties, I use just the thickness of the two face shells, and treat it as a rectangular section.

DaveAtkins

RE: Section Modulus - Masonry Wall

(OP)
@Dave,
In case of a grouted wall (with say 24" or 16" o.c), that can add up to a significant bump in the section modulus. Do you still only consider face shells?

RE: Section Modulus - Masonry Wall

They are in the CERM

RE: Section Modulus - Masonry Wall

Agree with your original method, EST and treat it as rectangular. This is to check the CMU compressive stress right?  

RE: Section Modulus - Masonry Wall

I mean come on guys, why the hell are you ignoring me!
The properties for the section moduli of grouted walls, partially or otherwise, are in the CERM
 

RE: Section Modulus - Masonry Wall

(OP)
@Toad:
The properties in the CERM or any TEK publication is for out-of-plane bending (with walls spanning vertically or horizontally). It is not for in-plane section properties.

RE: Section Modulus - Masonry Wall

(OP)
This is mainly to check the P/A + M/S on an unreinforced, partially grouted wall.

RE: Section Modulus - Masonry Wall

I see, & I apologize.
I hastily read the OP.

Do you mind my asking why it is necessary to  calculate this for your application. I don't get into masonry design much.

Thanks

RE: Section Modulus - Masonry Wall

My bet is its a short shear wall with a nice overturning shear force, then you need to check the T/C couple in the ends of the walls...

RE: Section Modulus - Masonry Wall

(OP)
See my response above Toad's post.

RE: Section Modulus - Masonry Wall

I'd say with 100% conviction that you can account for the grouted cells. You could probably just use the outermost grouted cell in your P/A + MC/I calc and use I=Ad^2 as a conservative check.  

RE: Section Modulus - Masonry Wall

If the wall is FULLY grouted, then yes, the width is the full width of the wall.  If partially grouted, I conservatively assume only the width of the two face shells are the width.

DaveAtkins

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