×
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

RC Deep Beam Deflection Calculations

RC Deep Beam Deflection Calculations

RC Deep Beam Deflection Calculations

(OP)
Hi Guys

I am using a wall as a deep beam and engaging the slabs as flanges. Is the theory the same for longterm deflection calculations for a deep beam as it is for a shallow flexural member (span/depth=2 ; span/thickness=40). I can find plenty of information regarding the flexural and shear strength but can't find much information dealing with deflections.

Regards

RE: RC Deep Beam Deflection Calculations

Quite likely that is because deep beams are usually proficient in delivering deflection control. You may get conservative estimates of the deflection by thinking of the deep beam as a strut and tie truss device.

RE: RC Deep Beam Deflection Calculations

Try if thread507-9049: DEFLECTION ANALYSIS OF A 12 METRE CONCRETE BEAM would help.
A quick search over the internet for deflection of deep concrete beams: The summary from the paper by Prabhat Kumar "Short term deflection of deep beams" published by ACI Journal August 1978 - Deflection of deep beam is considerably larger than that predicted by use of simple beam deflection formula with fully cracked section moment of inertia. The paper gives expressions for predicting deflections.........

RE: RC Deep Beam Deflection Calculations

Do you have very stringent deflection limitation which is much smaller than code may permit? If not, I don't see a reason for determining deep beam deflection.

RE: RC Deep Beam Deflection Calculations

(OP)
the problem arises because it is a transfer member, so any longterm deflection which hasn't been preset will be reflected thru the stories.

RE: RC Deep Beam Deflection Calculations

I would imagine that for a deep beam shear deformations may become more critical than flexural deformations. Also, I would think that due to the non-linear stress distribution that general deflection equations would not predict deflection very accurately.

I dont know if any FEA plate elements or such would give you an accurate stress distribution, but applying a long term factor to such a model may provide reasonable deflection results.

I think it comes down to figuring out and upper and lower bound to the solution in order to get a good understanding of what may occur.

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