×
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

CMU Shear Wall Analysis

CMU Shear Wall Analysis

CMU Shear Wall Analysis

(OP)
I have RAM Structural System v.13. The program allows you to model the structure with concrete, masonry or other shear wall types. I do not have the license that does the concrete shear wall design. However, RAM SS Frame module will analyze any shear wall as long as you input the "correct" properties. The shear wall design from the analysis will be manual.

The program is looking for E, thickness, density and Poissons ratio. For our typical jobs, E=1,350 ksi for f'm=1,500 psi strength masonry. Should I use this E or some percentage reduction for cracking and what about Poisson?
 

RE: CMU Shear Wall Analysis

I don't think E should be affected by cracking.

I don't think Poisson's Ratio matters that much.

DaveAtkins

RE: CMU Shear Wall Analysis

(OP)
Modifying the E to an "Effective E" seems to be the only good way to adjust the stiffness of the masonry shear wall to a realistic value.

This may not make any difference when all of the lateral resistance is in the form of shear walls. But it could make a big difference in a building with a mixture of shear walls, braced frames and steel moment frames.

The other possibility is modifying the wall thickness to an "effective thickness". Although the thickness of the wall contributes to the wall stiffness, it is also used by RAM for self-weight calculations.
 

RE: CMU Shear Wall Analysis

The 1500 psi f'm is about as low as you can get. I have been involved with 4500 psi hollow (about 52% solid) prisms.

Dick

 

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