×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

elastic modulus for clay masonry

elastic modulus for clay masonry

elastic modulus for clay masonry

(OP)
from ACI530 section 1.8

Em= 700 f'm for clay masonry.

where can i get the value for f'm?

RE: elastic modulus for clay masonry

Table I (page S-10) of the 2008 MSJC (ACI530-08).
It's dependent on the type of mortar and the net area compressive strength of the masonry unit alone.

RE: elastic modulus for clay masonry

(OP)
1000 psi for clay masonry?

i think it is too high.

is there another table for value?

RE: elastic modulus for clay masonry

You just "think" it is too high?

If you do not not agree with the with the ACI 530 table values, where else do you get current accurately research values for the f'm?

I have served on the MSJC for many years and always thought the position was quite conservative. You will have to back some old research to find accurately justified differences that you can hang your hat and license on.

I am sure you can find a different value somewhere, but is it supported?

Dick

RE: elastic modulus for clay masonry

Why do you think that's too high?  What do you typically use?   

RE: elastic modulus for clay masonry

And why do you typically use it?  Code values have recently gone up due to research which showed the system to be stronger than previously thought.

Although a separate issue, this has happened to an even more dramatic extent with Concrete Masonry.

I am not talking US code values, but I would think the progress would be similar to CSA & AS/NZS codes.

Cheers,

YS

B.Eng (Carleton)
Working in New Zealand, thinking of my snow covered home...

RE: elastic modulus for clay masonry

I have tested many clay bricks in compression.  It is common for the strength of the brick alone to exceed 8000 psi (yes, that's 8000 not 800). Mortar is relatively low in strength, usually near 1000 psi (yes, type S is supposed to be 1800 psi, etc.  but the reality is that compressive strength of mortar in the field is usually fairly low because the mixing procedures are so sloppy and masonry cement provides little margin for error in compressive strength)

So...the value in 530 is reasonable.

RE: elastic modulus for clay masonry

Perhaps the OP was refering to clay tiles and not clay bricks. I have an old handbook of clay tile engineering. It lists compression strengths (based on the kind of clay) ranging from 290 psi to 5640 psi

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources