×
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

Bending Moment in Flat Plate (Concrete Wall)

Bending Moment in Flat Plate (Concrete Wall)

Bending Moment in Flat Plate (Concrete Wall)

(OP)
What I have to analyze is a concrete window well wall for a custom home with basement. It is unusually long - 17'-2" to be exact.

The top of wall is unsupported because of the presence of a removable steel grate.

What I normally do for short (9'-6" long) walls - and this is SWAG, to be honest - take active soil pressure (35 psf/ft of depth) x 2/3 depth of retaining (usually 7') = 245 plf of applied load (service load)

I then compute maximum "positive" bending moment based on the 9'-6" horiz. span to be wl^2/10,  245x9.5^2/10 = 2210 ft-lbs, which is OK for an 8" thick concrete wall with #5 at 12" o/c horizontal with d = 5.75".

For the 17'-2" wall, this method doesn't work - but I recall some bending moment coefficient tables for flat plates fixed on 3 edges and the 4th edge free that I used about 25 yrs ago for designing sewage treatment tanks - I can't locate these online.

I can't use any "academia" style information with calculus formulae - it has been too long since university. When I Googled for info, there were pdf's that came up with all that.

RE: Bending Moment in Flat Plate (Concrete Wall)

(OP)
Thanks Jed

RE: Bending Moment in Flat Plate (Concrete Wall)

google "moody rectangular plates".  you should be able to pick up Moody's report (that Roark based his plate results on).

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