×
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!

*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

Two Diaphragms

Two Diaphragms

Two Diaphragms

(OP)
I have a floor on which diaphragms are separated by 5 ft vertically, If I define two separate rigid diaphragms then does the RAM considers them 2 different diaphragms so that when it will calculate the drifts, those will be for two different diaphragms?
Any help is appreciated.
Thanks.

RE: Two Diaphragms

Yes, you can, and should, model this as two separate diaphragms. At 5' separation you could model this on 2 distinct stories or model it on one story/level type and then adjust the column and wall elevations to raise or lower one of the areas by 5'. For overturning moment summation, the elevation of the force is derived directly from the original story data, so I recommend starting with a story height either between the two levels or at the higher elevation to be most conservative.
Drift results, etc are based on two separate diaphragms, though they could be linked with lateral beams if you wanted.
Wind calculations are based on two fully exposed towers. Where that assumption isn't perfect, user defined wind loads are my recommendation.
http://communities.bentley.com/Products/Structural...

RE: Two Diaphragms

(OP)
@SethGuthrie Thank you so much for your quick response. Just to confirm that the drifts are computed at center of mass? and when there are two diaphragms, RAM separate them while reporting. Also can you help me to find out some verification examples for lateral analysis.
I am user of ETABS for last 10 years and now starting use of RAM and therefore I have lots of question.

RE: Two Diaphragms

With drift, you can get results at the center of mass of each diaphragm (Reports - Story displacement) or for any graphically selected point (Process - Results - Drift at a point). It should give you what you are after.
Our community site has only a little bit of hand-verification samples, mostly for the design, not the analysis. http://communities.bentley.com/other/old_site_memb...
I don't have anything more general to share (regretfully the internal test benchmarks are not in a state to share).

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! Already a Member? Login


Resources

Low-Volume Rapid Injection Molding With 3D Printed Molds
Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Download Now
Design for Additive Manufacturing (DfAM)
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a part’s function at the center of their design considerations. Download Now
Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close