×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Contact US

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

Deflection Limits for concrete transfer beam supporting columns

Deflection Limits for concrete transfer beam supporting columns

Deflection Limits for concrete transfer beam supporting columns

(OP)
Hello All,

I am searching the information about deflection limits for concrete transfer beam.
The situation is that I am designing a concrete beam to support 4 stories high concrete column(load is about 100 kips ASD).
For the deflection limits, should I use L/480 with considering concrete long term deflection? Or Using L/240 is acceptable?
My colleague recommends to use L/600 with long term deflection(3 times short term deflection as estimation) as engineer judgement. But it seems too strict.
Any idea about what deflection limits should be used?

Thank you so much!

RE: Deflection Limits for concrete transfer beam supporting columns

I'm with your colleague. I don't have anything code specific to back it up, just that deflection in that one beam affects more than just one floor, so I'd be careful.

RE: Deflection Limits for concrete transfer beam supporting columns

Transfer structures are critical structural elements because their failure can be catastrophic. In the Eurocodes, the method of checking deflections using 'deemed to satisfy rules' is also applicable to reinforced concrete transfer beams.

Since most transfer beams can be treated as deep beams, their deflection is rarely a problem. There is an example of a design of transfer beams below;

Analysis and Design of Transfer Structures

RE: Deflection Limits for concrete transfer beam supporting columns

I think the decision shall be based on how sensitive is the upper structure to the subjected deflections.

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



News


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