×
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

T-Beam Fixity single span

T-Beam Fixity single span

T-Beam Fixity single span

(OP)
Random question, but if a single span T-beam is casted in place, wouldn't this likely be detailed as fixed? Unlike precast girders, isn't it typical practice to develope top steel for cast in place beams or is it not always the case?Thank you for input.

RE: T-Beam Fixity single span

Quote (BatMan)

f a single span T-beam is casted in place, wouldn't this likely be detailed as fixed?

In CIP concrete it would typically be detailed to have some nominal negative moment capacity near the supports in acknowledgement of the fact that there's always some restraint in CIP construction. Often you'll see this as detailed such that you'll have 1/4 to 1/3 of the mid-span positive moment capacity available as negative capacity at the ends.. And the bars will typically extend into the beam 0.25 - 0.30 L. Through interactions here, I've learned the the Euro-codes actually have provisions for this which I think is pretty nifty.

I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.

RE: T-Beam Fixity single span

In addition to KootK's comments - realize that the amount of "fixity" is only dependent on the stiffness of the thing fixed to.
If you have thin little columns, or a slender wall that you are supported on, there isn't much stiffness there when compared with a large column or mass of concrete.

So the correct answer is...it depends.

Check out Eng-Tips Forum's Policies here:
FAQ731-376: Eng-Tips.com Forum Policies

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